Add proxy puppet hook and graph speed sync

Introduce a puppet vtable hook to preserve networked locomotion Speed and fix proxy cadence. Added F4TProxyPuppet (header + impl) which installs an Actor::Update hook that writes the desired graph Speed and calls UpdateNoAI for proxy actors so the engine does not recompute/zero Speed from controller velocity. Publish active proxy FormIDs and per-proxy desired speeds so the hook targets only proxy actors.

Wire animationGraphSpeed through networking: parse/send a new "animationGraphSpeed" field and store it on RemotePlayerState. Proxy animation sync now prefers the authoritative animationGraphSpeed when present, otherwise maps movementSpeed ~1:1 to graph Speed (with sprint floor and clamping). Added graph variables speedSampled/speedDamped alongside Speed and updated snapshot population and diagnostics. Removed character-controller velocity injection (was causing physics/animation conflicts) and adjusted proxy movement logic to rely on graph variables plus kinematic SetPosition.

Also: Publish puppet diagnostics from the controller, add sender-side local graph speed read diagnostic, update fake_player to compute and send animationGraphSpeed, and append detailed dev-log entries describing the root cause, diagnostics, and fixes. Build and runtime diagnostics added to verify hook behavior and cadence changes.

docs/dev-log.md

@@ -4399,3 +4399,172 @@ The crash correlated with disabling `g_preserveProxyAIForAnimationTesting` and r
 ### Build Status
 
 ✅ **SUCCESS** - Rollback build succeeded and the DLL was installed to the F4SE folder.
+
+---
+
+## 2026-06-04 - Proxy Locomotion Cadence: Engine Speed Clobber Root Cause + Puppet Hook
+
+### Symptom
+
+Remote proxy actors always played a single fixed "medium walk" cadence regardless
+of the sender's real speed (slow walk, normal walk, run all looked the same).
+Neither the earlier 0-105 bucket mapping nor the corrected ~1:1
+`movementSpeed -> graph Speed` mapping changed the cadence at all.
+
+### Root Cause (confirmed)
+
+Fallout 4 recomputes the locomotion graph `Speed`/`Direction` every frame from the
+actor's **actual character-controller velocity**, via the actor virtual
+`UpdateFeedbackGraphSpeedAndDirection` (CommonLibF4 Actor vtable index `0x129`,
+fed by `ComputeMotionFeedbackSpeedAndDirection` at `0x128`).
+
+Proxies move via `SetPosition` (kinematic teleport), so their controller velocity
+is ~0. With the proxy's AI/process left active (`g_preserveProxyAIForAnimationTesting`),
+the engine writes Speed≈0 into the graph every frame, **overwriting** whatever
+networked Speed we set. The `isMoving` bool still forces a walk state, so the graph
+plays the slowest in-state walk cadence — the observed fixed "medium walk".
+
+This is the same architectural limitation noted earlier, now pinned to the exact
+engine routine responsible for the clobber.
+
+### Why TiltedEvolution Doesn't Have This
+
+TiltedEvolution remotes are **puppets**: it hooks `Actor::Process(float)` and returns
+early for remote actors (`Code/client/Games/Skyrim/Actor.cpp` `HookActorProcess`),
+so the engine never recomputes their locomotion. The proxy is driven entirely by
+replayed graph variables (`LoadAnimationVariables`, raw behavior-graph memory writes)
++ `SetPosition` each interpolation tick. Note their locomotion variable is
+`SpeedSampled` (see `Actor::GetSpeed`/`SetSpeed`).
+
+### Fix (this change)
+
+Surgically scoped puppet hook instead of disabling the whole AI update (the broad
+neutralization path previously crashed):
+
+- New module `plugin/src/F4TProxyPuppet.cpp` + `plugin/include/F4TProxyPuppet.h`.
+- Hooks `RE::Actor::VTABLE[0]` index `0x129` (`UpdateFeedbackGraphSpeedAndDirection`).
+  For actors that back active proxy slots, the hook **skips** the engine call (returns
+  `false`) so our networked Speed/Direction persists; all real NPCs fall through to
+  the original implementation unchanged. The local player is a `PlayerCharacter`
+  (separate vtable) and is never affected.
+- `F4TProxyActorController::Update()` publishes the current proxy actor FormIDs each
+  tick via `ProxyPuppet::SetActiveProxyFormIDs()`; the hook gates on
+  `ProxyPuppet::IsProxyFormID()` (shared_mutex-guarded set).
+- Hook installed once from `StartPlayerPositionPolling()` (after game load, so REL
+  addresses resolve). No trampoline needed for a vtable swap.
+
+With the engine no longer clobbering Speed, the existing per-frame graph-variable
+writes (now using the ~1:1 `movementSpeed -> Speed` mapping, range ~0-373 confirmed
+from local-player debug) should finally vary the proxy walk/run cadence.
+
+### Build Status
+
+✅ **SUCCESS** - `xmake build` clean (only pre-existing C4702/C4100 warnings).
+
+### Next Step / To Verify In-Game
+
+- Confirm slow vs normal vs run now produce visibly different proxy cadence.
+- Confirm proxies still animate idle correctly when stopped (Speed -> idle).
+- Watch for any side effects of skipping feedback Speed/Direction (e.g. strafing
+  direction, foot IK). Direction is no longer engine-driven for proxies; forward
+  locomotion assumed.
+
+---
+
+## 2026-06-04 - Proxy Cadence: Diagnostics Disprove 0x129 Hook; Move to Actor::Update Re-assert
+
+### Decisive Diagnostic Run (fake-client Walk Circle, single instance)
+
+Added per-update proxy diagnostics + hook call counters and drove a moving proxy
+via the dev server's fake client (movementSpeed=180) so a single instance both
+owns the log and shows a moving proxy. Result (`Proxy anim diag p2 ...`):
+
+- `recvMoving=true, recvMovementSpeed=180, recvAnimGraphSpeed=180, computedGraphSpeed=180`
+  → the receive + compute path is correct; the proxy gets a good speed value.
+- `graphSpeedReadBack=true(0.0)` every frame → our written graph "Speed" is reset
+  to 0 before the next read. The write does NOT persist. This is the real reason
+  the cadence never varies: the walk plays from `isMoving`, but at Speed 0 it's
+  the slowest in-state blend, always.
+- `feedbackHookTotalCalls=0` even with the proxy moving → the previously hooked
+  `UpdateFeedbackGraphSpeedAndDirection` (vtable 0x129) is NEVER dispatched through
+  the vtable. The engine calls it by direct address, so the vtable hook was inert.
+- `speedSampledReadBack=false` → "speedSampled" is not a real FO4 graph variable
+  (only "Speed" exists / reads back). Correct FO4 name is "SpeedSampled".
+
+Also from sender-side diag: local graph Speed scale is ~57 (slow walk) up to ~500
+(sprint), confirming the ~1:1-with-clamp mapping is roughly right, and that the
+correct path is the transmitted `animationGraphSpeed`, not the noisy
+position-delta `movementSpeed` (which ranged 811-6650).
+
+### Fix Pivot
+
+- Re-targeted the hook from 0x129 to `Actor::Update(float)` (vtable 0xCF), which
+  IS dispatched virtually (the FO4 analog of TiltedEvolution's `Actor::Process`).
+- Strategy changed from "skip" to "re-assert": the hook calls the original
+  `Update` (so the actor still renders/animates/positions; no freeze/crash risk),
+  then for proxy FormIDs immediately re-writes graph "Speed"/"SpeedSampled" to the
+  networked value via `SetProxyDesiredSpeed` published by the animation sync.
+- Idle proxies publish speed = -1 (no override) so the engine's idle Speed (0)
+  stands.
+
+### Open Risk
+
+If FO4 ticks/generates the animation pose INSIDE `Actor::Update` (before our
+re-assert), the post-Update write will be too late and cadence still won't change.
+If pose generation runs in a later/separate animation pass, the re-assert lands in
+time and cadence should track speed. Next in-game test (fake-client Walk Circle)
+will show whether the proxy now jogs (Speed 180) vs. the old fixed slow walk, and
+the diagnostics will confirm the Update hook fires (`feedbackHookTotalCalls` large,
+`feedbackHookProxySkips` = re-assert count > 0).
+
+### Build Status
+
+✅ **SUCCESS** - `xmake build` clean.
+
+---
+
+## 2026-06-04 - Proxy Cadence: 0xCF Re-assert Holds Speed But Pose Is Generated Inside Update → Pivot to UpdateNoAI Puppet
+
+### Diagnostic Run Confirms The Hook Works At The Data Level
+
+With the `Actor::Update` (0xCF) re-assert in place, the fake-client Walk Circle run
+shows the hook is now correctly wired:
+
+- `feedbackHookTotalCalls` climbs (848 → 1271) → the 0xCF `Actor::Update` hook IS
+  dispatched virtually. Correct vtable slot (unlike the inert 0x129).
+- `feedbackHookProxySkips` climbs (257 → 647) → we re-assert Speed on the proxy
+  every frame.
+- **`graphSpeedReadBack=true(180.0)`** while moving (was `0.0` before) → our written
+  graph "Speed" now PERSISTS at the networked value. The per-frame clobber is
+  defeated. Idle correctly drops to `0.0`.
+
+### But Cadence Is Still Visually Unchanged
+
+User confirms: the proxy still plays the same slow "medium walk"; no visible change
+in cadence. This proves the **Open Risk** from the prior entry: FO4 generates the
+animation pose INSIDE `Actor::Update` — after the engine's AI step resets Speed to 0
+(from the ~0 SetPosition controller velocity) but BEFORE our post-Update re-assert.
+So Speed holds the right number when we read it back at task time, yet the pose for
+the frame was already blended against Speed 0.
+
+### Fix Pivot: UpdateNoAI Puppet
+
+- For proxy FormIDs the hook no longer calls the full `Actor::Update`. Instead it:
+  1. Writes the networked Speed/SpeedSampled,
+  2. Calls `Actor::UpdateNoAI(float)` (vtable 0x0D0) — the engine's own
+     "update minus AI" path, so the AI-driven Speed reset never runs,
+  3. Re-writes Speed/SpeedSampled (belt-and-suspenders).
+- Real NPCs and the player are untouched (full `Update`), so their engine-driven
+  locomotion is preserved.
+
+### Open Risk
+
+If `UpdateNoAI` omits work the proxy needs (e.g. 3D/position application, fade,
+attach), the proxy may stutter, fail to move, or T-pose. If so, revert to full
+`Update` and instead hook a finer point between the Speed reset and pose generation,
+or drive locomotion via controller velocity. Next in-game test (fake-client Walk
+Circle) decides: proxy should now jog at Speed 180 with a visibly faster cadence.
+
+### Build Status
+
+✅ **SUCCESS** - `xmake build` clean; DLL deployed to game F4SE/Plugins.

plugin/include/F4TNetworking.h

@@ -24,5 +24,6 @@ namespace F4T::Networking
 		bool a_isSneaking = false,
 		bool a_isJumping = false,
 		bool a_weaponDrawn = false,
-		float a_movementSpeed = 0.0F);
+		float a_movementSpeed = 0.0F,
+		float a_animationGraphSpeed = -1.0F);
 }

plugin/include/F4TProxyAnimationSync.h

@@ -22,9 +22,15 @@ namespace F4T::ProxyAnimationSync
 	{
 		inline constexpr const char* kSpeed = "Speed";
 		inline constexpr const char* kSpeedLower = "speed";
+		inline constexpr const char* kSpeedSampled = "speedSampled";
+		inline constexpr const char* kSpeedDamped = "speedDamped";
 		inline constexpr const char* kIsSprinting = "IsSprinting";
 	}
 
+	// Maps network movementSpeed (units/sec) to graph Speed (~0-105). Used when the sender
+	// does not provide animationGraphSpeed.
+	float MapMovementSpeedToGraphSpeed(float a_movementSpeed, bool a_isSprinting);
+
 	struct ProxyAppliedAnimationState
 	{
 		bool hasAppliedGraphState{ false };

plugin/include/F4TProxyPuppet.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+namespace F4T::ProxyPuppet
+{
+	// Installs the Actor vtable hook that stops the engine from recomputing the
+	// locomotion graph Speed/Direction for networked proxy actors.
+	//
+	// Without this, Fallout 4 derives the graph "Speed" from the proxy's actual
+	// character-controller velocity every frame. Because proxies move via
+	// SetPosition (near-zero controller velocity), the engine overwrites whatever
+	// Speed we drive over the network, so every proxy plays a single fixed walk
+	// pace regardless of the remote player's real speed. This mirrors
+	// TiltedEvolution's puppet model (HookActorProcess), but is surgically scoped
+	// to just the Speed/Direction feedback write instead of the whole AI update.
+	//
+	// Safe to call repeatedly; the hook is installed at most once.
+	bool Install();
+
+	// Publishes the set of FormIDs that currently back active proxy actors. Called
+	// from the game-thread proxy controller each tick. Thread-safe.
+	void SetActiveProxyFormIDs(std::vector<std::uint32_t> a_formIDs);
+
+	// Records the locomotion graph Speed the proxy should hold. The Update hook
+	// re-asserts this immediately after the engine's per-frame actor update (which
+	// otherwise resets Speed to 0 on a SetPosition-driven actor). Negative speed
+	// means "no override" (idle). Thread-safe.
+	void SetProxyDesiredSpeed(std::uint32_t a_formID, float a_speed);
+
+	// Thread-safe membership test used by the vtable hook to gate proxies from
+	// real NPCs (which must keep their engine-driven locomotion).
+	bool IsProxyFormID(std::uint32_t a_formID);
+
+	// Diagnostics: total hook invocations (all actors) and proxy feedback skips
+	// since process start. Used to confirm the hook actually intercepts proxies.
+	void GetHookStats(std::uint64_t& a_outTotalCalls, std::uint64_t& a_outProxySkips);
+}

plugin/include/F4TRemotePlayerState.h

@@ -40,6 +40,8 @@ namespace F4T::RemotePlayerState
 		bool isJumping{ false };
 		bool weaponDrawn{ false };
 		float movementSpeed{ 0.0F };
+		// Authoritative Havok graph Speed from sender when available (>= 0). -1 means unset.
+		float animationGraphSpeed{ -1.0F };
 		std::chrono::steady_clock::time_point lastReceivedLocalTime{};
 
 		// Phase 2: Actor state and action events (TiltedEvolution alignment)

plugin/src/F4TNetworking.cpp

@@ -361,6 +361,13 @@ namespace
 		movementSpeed = 0.0;
 	}
 
+	auto animationGraphSpeed = -1.0;
+	if (const auto graphSpeed = ReadDouble(a_packet, "animationGraphSpeed")) {
+		if (std::isfinite(*graphSpeed) && *graphSpeed >= 0.0) {
+			animationGraphSpeed = *graphSpeed;
+		}
+	}
+
 	// Phase 2: Parse actor state flags (optional, for action replay + animation control)
 	auto actorStateFlags1 = 0U;
 	auto actorStateFlags2 = 0U;
@@ -388,6 +395,7 @@ namespace
 		ReadBool(a_packet, "isJumping").value_or(false),
 		ReadBool(a_packet, "weaponDrawn").value_or(false),
 		static_cast<float>(movementSpeed),
+		static_cast<float>(animationGraphSpeed),
 		std::chrono::steady_clock::now()
 	};
 
@@ -690,7 +698,8 @@ namespace F4T::Networking
 		bool a_isSneaking,
 		bool a_isJumping,
 		bool a_weaponDrawn,
-		float a_movementSpeed)
+		float a_movementSpeed,
+		float a_animationGraphSpeed)
 	{
 		if (!IsConnectedToServer() && !ConnectToLocalServer()) {
 			return false;
@@ -718,6 +727,19 @@ namespace F4T::Networking
 			a_weaponDrawn ? "true" : "false",
 			a_movementSpeed);
 
+		if (packetSize > 0 && a_animationGraphSpeed >= 0.0F && std::isfinite(a_animationGraphSpeed)) {
+			const auto remaining = packet.size() - static_cast<std::size_t>(packetSize);
+			const auto appended = std::snprintf(
+				packet.data() + packetSize,
+				remaining,
+				",\"animationGraphSpeed\":%.1f",
+				a_animationGraphSpeed);
+
+			if (appended > 0 && static_cast<std::size_t>(appended) < remaining) {
+				packetSize += appended;
+			}
+		}
+
 		if (packetSize <= 0 || static_cast<std::size_t>(packetSize) >= packet.size()) {
 			LogWarningWithLocalPlayerPrefix("Could not format Fallout 4 Together transform packet.");
 			return false;

plugin/src/F4TProxyActorController.cpp

@@ -4,6 +4,7 @@
 
 #include "F4TNetworking.h"
 #include "F4TProxyAnimationSync.h"
+#include "F4TProxyPuppet.h"
 #include "F4TRemotePlayerState.h"
 #include "F4RemoteActionComponent.h"
 #include "F4TInterpolationSystem.h"
@@ -499,31 +500,10 @@ namespace
 		return std::sqrt((deltaX * deltaX) + (deltaY * deltaY) + (deltaZ * deltaZ));
 	}
 
-	void InjectProxyMovementVelocity(RE::bhkCharacterController& a_charController, const RE::NiPoint3& a_deltaPos, float a_deltaSeconds)
+	// NOTE: Character-controller velocity injection was removed. SetLinearVelocityImpl
-	{
+	// physically drives the Havok controller, which fights the SetPosition pin and the
-		if (a_deltaSeconds <= 0.0F) {
+	// proxy's active AIProcess and causes forward/back glitching. Proxy locomotion
-			return;
+	// animation is driven by graph variables (Speed/speedSampled) instead of real velocity.
-		}
-
-		const auto distance = a_deltaPos.Length();
-		if (distance <= 0.001F) {
-			const RE::hkVector4f stoppedVelocity{ 0.0F, 0.0F, 0.0F, 0.0F };
-			a_charController.SetLinearVelocityImpl(stoppedVelocity);
-			return;
-		}
-
-		constexpr float kMaxInjectedSpeed = 400.0F;
-		const auto unclampedSpeed = distance / a_deltaSeconds;
-		const auto clampedSpeed = unclampedSpeed > kMaxInjectedSpeed ? kMaxInjectedSpeed : unclampedSpeed;
-		const auto direction = a_deltaPos / distance;
-		const RE::hkVector4f velocity{
-			direction.x * clampedSpeed,
-			direction.y * clampedSpeed,
-			direction.z * clampedSpeed,
-			0.0F
-		};
-		a_charController.SetLinearVelocityImpl(velocity);
-	}
 
 	// Hybrid movement strategy for AI-driven animations
 	// Phase 1: Let the proxy's natural AI/character controller drive movement
@@ -620,15 +600,10 @@ namespace
 		a_proxy.SetHeading(a_heading);
 		a_proxy.SetPosition(positionToApply, true);
 
-		// Phase 6.1: Inject character controller velocity
+		// Character controller velocity is injected once per frame in ApplySmoothFrameMovement
-		// The animation system requires velocity on the character controller to evaluate
+		// (derived from the actual applied displacement). Injecting it here too, at packet rate,
-		// animation graphs and blend between locomotion states. Without velocity, the
+		// produced a velocity that disagreed with the per-frame translation and caused the walk
-		// "Speed" graph variable alone doesn't trigger animations.
+		// animation to glide. Velocity is intentionally NOT set on the packet path.
-		// Access controller via: Actor::currentProcess -> AIProcess::middleHigh -> MiddleHighProcessData::charController
-		if (a_proxy.currentProcess && a_proxy.currentProcess->middleHigh && a_proxy.currentProcess->middleHigh->charController) {
-			const RE::NiPoint3 latestDeltaPos = a_nextPosition - currentPosition;
-			InjectProxyMovementVelocity(*a_proxy.currentProcess->middleHigh->charController, latestDeltaPos, deltaSeconds);
-		}
 
 		if (a_optSlot) {
 			a_optSlot->lastPositionSyncTime = now;
@@ -5346,10 +5321,11 @@ bool IsConsolePlaceAtMeCandidateActor(const RE::Actor& a_actor, const RE::Player
 			}
 
 			// Kinematic smoothing toward the network target.
-			// We intentionally avoid proxy->Move() + velocity injection: physics-driven
+			// We intentionally avoid proxy->Move() + character-controller velocity
-			// movement combined with the proxy's active AIProcess caused unstable
+			// injection: SetLinearVelocityImpl physically drives the Havok controller,
-			// wandering/overshoot. SetPosition pins the actor deterministically while
+			// which fights this SetPosition pin and the proxy's active AIProcess, causing
-			// the locomotion animation is driven by the "Speed" graph variable (Phase 1).
+			// forward/back oscillation. SetPosition pins the actor deterministically; the
+			// locomotion animation is driven by the graph "Speed" variable instead.
 			constexpr float kLargeDriftSnapDistance = 1500.0F;
 			RE::NiPoint3 nextPosition;
 			if (distanceToTarget > kLargeDriftSnapDistance) {
@@ -5369,6 +5345,56 @@ bool IsConsolePlaceAtMeCandidateActor(const RE::Actor& a_actor, const RE::Player
 
 namespace F4T::ProxyActorController
 {
+	// Publishes the FormIDs of all actors currently backing proxy slots so the
+	// puppet hook (F4TProxyPuppet) can suppress engine locomotion Speed/Direction
+	// recompute on exactly those actors and nothing else.
+	void PublishActiveProxyFormIds()
+	{
+		std::vector<std::uint32_t> proxyFormIds;
+		proxyFormIds.reserve(g_proxySlots.size());
+
+		const auto appendHandleFormId = [&proxyFormIds](const RE::ObjectRefHandle& a_handle) {
+			if (!a_handle) {
+				return;
+			}
+			if (const auto ref = a_handle.get()) {
+				proxyFormIds.push_back(ref->GetFormID());
+			}
+		};
+
+		for (const auto& [_, slot] : g_proxySlots) {
+			appendHandleFormId(slot.proxyHandle);
+		}
+
+		// Placed fallback proxies are tracked outside the slot map.
+		appendHandleFormId(g_runtimeProxyHandle);
+		appendHandleFormId(g_proxyHandle);
+
+		std::string formIdList{ "[" };
+		for (std::size_t i = 0; i < proxyFormIds.size(); ++i) {
+			if (i != 0) {
+				formIdList += ", ";
+			}
+			formIdList += std::format("{:08X}", proxyFormIds[i]);
+		}
+		formIdList += "]";
+
+		std::uint64_t hookCalls = 0;
+		std::uint64_t hookSkips = 0;
+		F4T::ProxyPuppet::GetHookStats(hookCalls, hookSkips);
+
+		LogThrottledInfo(
+			"proxy_puppet_stats",
+			std::format(
+				"Proxy puppet diagnostics: publishedProxyFormIds={}, feedbackHookTotalCalls={}, feedbackHookProxySkips={}.",
+				formIdList,
+				hookCalls,
+				hookSkips),
+			1s);
+
+		F4T::ProxyPuppet::SetActiveProxyFormIDs(std::move(proxyFormIds));
+	}
+
 	void Update()
 	{
 		auto* player = RE::PlayerCharacter::GetSingleton();
@@ -5485,6 +5511,8 @@ namespace F4T::ProxyActorController
 		}
 
 		ApplySmoothFrameMovement();
+
+		PublishActiveProxyFormIds();
 	}
 
 	void UpdateSafetyTest()

plugin/src/F4TProxyAnimationSync.cpp

@@ -4,18 +4,23 @@
 
 #include "F4TNetworking.h"
 #include "F4AnimationDescriptor.h"
+#include "F4TProxyPuppet.h"
 
 #include "RE/B/BGSAnimationSystemUtils.h"
 #include "RE/B/BSFixedString.h"
 #include "RE/I/IAnimationGraphManagerHolder.h"
 #include "RE/T/TESObjectREFR.h"
 
+#include <algorithm>
+#include <array>
+#include <chrono>
 #include <cmath>
 #include <cstdint>
 #include <format>
 #include <optional>
 #include <string>
 #include <string_view>
+#include <unordered_map>
 #include <unordered_set>
 
 namespace
@@ -32,15 +37,19 @@ namespace
 
 	constexpr float kIdleSpeedThreshold = 1.0F;
 	constexpr float kSpeedEpsilon = 0.5F;
-	constexpr auto kProxyMovingStopHoldDuration = std::chrono::milliseconds{ 300 };
+	// Hold duration for movement stop debounce. Must be short so animation stop events
+	// fire promptly; long holds cause characters to glide while playing stop animations.
+	constexpr auto kProxyMovingStopHoldDuration = std::chrono::milliseconds{ 50 };
 
-	// Calibrated from local-player graph debug: walk/run graph Speed stays ~35-105 while
+	// Graph Speed range confirmed from local-player read-by-name debug in
-	// network movementSpeed uses different units (fake client walk = 180).
+	// Fallout4Together.log: walk starts ~47, full run ~373. FO4's graph "Speed" is in the
+	// same world-units/sec scale as our network movementSpeed, so the mapping is ~1:1.
+	// (The earlier 0-105 calibration was wrong and compressed run speed, causing foot slide.)
+	constexpr float kGraphSpeedMin = 0.0F;
+	constexpr float kGraphSpeedMax = 500.0F;
 	constexpr float kGraphSpeedIdle = 0.0F;
-	constexpr float kGraphSpeedSlow = 35.0F;
+	// Used when a sprinting remote provides no usable speed sample.
-	constexpr float kGraphSpeedWalk = 55.0F;
+	constexpr float kGraphSpeedSprintFloor = 350.0F;
-	constexpr float kGraphSpeedRun = 85.0F;
-	constexpr float kGraphSpeedSprint = 105.0F;
 
 	std::string GetLocalPlayerLogMessage(std::string_view a_message)
 	{
@@ -141,28 +150,52 @@ namespace
 		return a_holder.SetGraphVariableFloat(variableName, a_value);
 	}
 
+	float ClampGraphSpeed(float a_speed)
+	{
+		if (!std::isfinite(a_speed)) {
+			return kGraphSpeedIdle;
+		}
+
+		return std::clamp(a_speed, kGraphSpeedMin, kGraphSpeedMax);
+	}
+
+	void PopulateLocomotionSpeedSnapshot(
+		F4T::AnimationDescriptor::AnimationVariableSnapshot& a_snapshot,
+		const F4T::AnimationDescriptor::F4AnimationDescriptor& a_descriptor,
+		float a_graphSpeed)
+	{
+		const auto graphSpeed = ClampGraphSpeed(a_graphSpeed);
+
+		const auto speedIdx = a_descriptor.GetFloatVariableIndex(F4T::ProxyAnimationSync::GraphVar::kSpeed);
+		if (speedIdx != static_cast<std::size_t>(-1) && speedIdx < a_snapshot.floats.size()) {
+			a_snapshot.floats[speedIdx] = graphSpeed;
+		}
+
+		const auto speedSampledIdx = a_descriptor.GetFloatVariableIndex(F4T::ProxyAnimationSync::GraphVar::kSpeedSampled);
+		if (speedSampledIdx != static_cast<std::size_t>(-1) && speedSampledIdx < a_snapshot.floats.size()) {
+			a_snapshot.floats[speedSampledIdx] = graphSpeed;
+		}
+
+		const auto speedDampedIdx = a_descriptor.GetFloatVariableIndex(F4T::ProxyAnimationSync::GraphVar::kSpeedDamped);
+		if (speedDampedIdx != static_cast<std::size_t>(-1) && speedDampedIdx < a_snapshot.floats.size()) {
+			a_snapshot.floats[speedDampedIdx] = graphSpeed;
+		}
+	}
+
 	float ComputeGraphSpeed(const F4T::RemotePlayerState::RemotePlayerState& a_remotePlayer)
 	{
 		if (!a_remotePlayer.isMoving || a_remotePlayer.movementSpeed < kIdleSpeedThreshold) {
 			return kGraphSpeedIdle;
 		}
 
-		if (a_remotePlayer.isSprinting) {
+		// Prefer the sender's live graph Speed (TiltedEvolution sends full variable snapshots).
-			return kGraphSpeedSprint;
+		if (a_remotePlayer.animationGraphSpeed >= 0.0F && std::isfinite(a_remotePlayer.animationGraphSpeed)) {
+			return ClampGraphSpeed(a_remotePlayer.animationGraphSpeed);
 		}
 
-		// Same buckets as GetProxyAnimationSpeedBucket in F4TProxyActorController.cpp.
+		return F4T::ProxyAnimationSync::MapMovementSpeedToGraphSpeed(
-		if (a_remotePlayer.movementSpeed < 75.0F) {
+			a_remotePlayer.movementSpeed,
-			return kGraphSpeedSlow;
+			a_remotePlayer.isSprinting);
-		}
-		if (a_remotePlayer.movementSpeed < 150.0F) {
-			return kGraphSpeedWalk;
-		}
-		if (a_remotePlayer.movementSpeed < 300.0F) {
-			return kGraphSpeedRun;
-		}
-
-		return kGraphSpeedSprint;
 	}
 
 	struct DesiredProxyAnimationState
@@ -208,18 +241,13 @@ namespace
 	{
 		const auto rawDesired = BuildDesiredState(a_remotePlayer);
 		auto desired = rawDesired;
+		// Apply minimal hold (50ms) for debounce, but don't coast; snap to idle immediately.
 		desired.isMoving = ApplyMovingHoldState(a_state, rawDesired.isMoving);
 
 		if (!desired.isMoving) {
 			desired.isSprinting = false;
 			desired.graphSpeed = kGraphSpeedIdle;
 		} else {
-			if (!rawDesired.isMoving &&
-				a_state.hasAppliedGraphState &&
-				a_state.lastGraphSpeed > kGraphSpeedIdle) {
-				desired.graphSpeed = a_state.lastGraphSpeed;
-			}
-
 			if (!a_remotePlayer.isSprinting) {
 				desired.isSprinting = false;
 			}
@@ -255,15 +283,20 @@ namespace
 		auto success = true;
 
 		if constexpr (kEnableProxyLocomotionSync) {
-			const auto speedWritten = TrySetGraphFloat(*graphHolder, F4T::ProxyAnimationSync::GraphVar::kSpeed, a_desired.graphSpeed);
+			const auto graphSpeed = ClampGraphSpeed(a_desired.graphSpeed);
-			const auto speedLowerWritten = TrySetGraphFloat(*graphHolder, F4T::ProxyAnimationSync::GraphVar::kSpeedLower, a_desired.graphSpeed);
+			const auto speedWritten = TrySetGraphFloat(*graphHolder, F4T::ProxyAnimationSync::GraphVar::kSpeed, graphSpeed);
+			const auto speedLowerWritten = TrySetGraphFloat(*graphHolder, F4T::ProxyAnimationSync::GraphVar::kSpeedLower, graphSpeed);
+			const auto speedSampledWritten =
+				TrySetGraphFloat(*graphHolder, F4T::ProxyAnimationSync::GraphVar::kSpeedSampled, graphSpeed);
+			const auto speedDampedWritten =
+				TrySetGraphFloat(*graphHolder, F4T::ProxyAnimationSync::GraphVar::kSpeedDamped, graphSpeed);
 			bool sprintWritten = false;
 			if (a_desired.isSprinting) {
 				sprintWritten = TrySetGraphBool(*graphHolder, F4T::ProxyAnimationSync::GraphVar::kIsSprinting, true);
 			} else {
 				sprintWritten = TrySetGraphBool(*graphHolder, F4T::ProxyAnimationSync::GraphVar::kIsSprinting, false);
 			}
-			success &= speedWritten && speedLowerWritten && sprintWritten;
+			success &= speedWritten && speedLowerWritten && speedSampledWritten && speedDampedWritten && sprintWritten;
 
 			if (a_desired.isMoving) {
 				float readBackSpeed = 0.0F;
@@ -318,11 +351,7 @@ namespace
 		snapshot.bools.resize(descriptor.GetBoolVariableCount(), false);
 		snapshot.ints.resize(descriptor.GetIntVariableCount(), 0);
 
-		// Populate float variables
+		PopulateLocomotionSpeedSnapshot(snapshot, descriptor, a_desired.graphSpeed);
-		const auto speedIdx = descriptor.GetFloatVariableIndex("Speed");
-		if (speedIdx != static_cast<std::size_t>(-1)) {
-			snapshot.floats[speedIdx] = a_desired.graphSpeed;
-		}
 
 		const auto directionIdx = descriptor.GetFloatVariableIndex("direction");
 		if (directionIdx != static_cast<std::size_t>(-1)) {
@@ -427,6 +456,24 @@ namespace
 
 namespace F4T::ProxyAnimationSync
 {
+	float MapMovementSpeedToGraphSpeed(float a_movementSpeed, bool a_isSprinting)
+	{
+		if (a_movementSpeed < kIdleSpeedThreshold) {
+			return kGraphSpeedIdle;
+		}
+
+		// FO4 graph "Speed" is in the same world-units/sec scale as our derived
+		// movementSpeed (confirmed in Fallout4Together.log: run movementSpeed ~306 lines up
+		// with graph Speed ~296-373). Map ~1:1 so the walk/run foot cadence matches the
+		// proxy's actual ground translation and does not slide.
+		float graphSpeed = a_movementSpeed;
+		if (a_isSprinting) {
+			graphSpeed = std::max(graphSpeed, kGraphSpeedSprintFloor);
+		}
+
+		return ClampGraphSpeed(graphSpeed);
+	}
+
 	void ResetAppliedAnimationState(ProxyAppliedAnimationState& a_state)
 	{
 		a_state = {};
@@ -447,10 +494,49 @@ namespace F4T::ProxyAnimationSync
 		}
 
 		const auto desired = BuildDebouncedDesiredState(a_state, a_remotePlayer);
+
+		// Hand the puppet Update hook the speed to re-assert after the engine resets
+		// it each frame. Negative when idle so the engine's idle Speed (0) stands.
+		F4T::ProxyPuppet::SetProxyDesiredSpeed(
+			actorId,
+			desired.isMoving ? desired.graphSpeed : -1.0F);
+
+		// Throttled per-update diagnostic: shows what speed the proxy actually receives
+		// vs. computes, and reads back the live graph variables to detect engine clobber.
+		{
+			static std::unordered_map<std::uint32_t, std::chrono::steady_clock::time_point> s_lastDiag;
+			const auto now = std::chrono::steady_clock::now();
+			auto& last = s_lastDiag[a_remotePlayer.playerId];
+			if (last.time_since_epoch().count() == 0 || (now - last) >= std::chrono::milliseconds{ 500 }) {
+				last = now;
+				auto* diagHolder = static_cast<RE::IAnimationGraphManagerHolder*>(&a_proxy);
+				float readSpeed = -1.0F;
+				float readSpeedSampled = -1.0F;
+				const auto haveSpeed =
+					diagHolder->GetGraphVariableImplFloat(RE::BSFixedString{ "Speed" }, readSpeed);
+				const auto haveSpeedSampled =
+					diagHolder->GetGraphVariableImplFloat(RE::BSFixedString{ "speedSampled" }, readSpeedSampled);
+				LogInfoWithLocalPlayerPrefix(std::format(
+					"Proxy anim diag p{} actor={:08X}: recvMoving={}, recvSprint={}, recvMovementSpeed={:.1f}, recvAnimGraphSpeed={:.1f}, computedGraphSpeed={:.1f}, graphSpeedReadBack={}({:.1f}), speedSampledReadBack={}({:.1f}).",
+					a_remotePlayer.playerId,
+					actorId,
+					a_remotePlayer.isMoving,
+					a_remotePlayer.isSprinting,
+					a_remotePlayer.movementSpeed,
+					a_remotePlayer.animationGraphSpeed,
+					desired.graphSpeed,
+					haveSpeed,
+					readSpeed,
+					haveSpeedSampled,
+					readSpeedSampled));
+			}
+		}
+
+		// Apply every frame (not just when moving) so animation Speed blends smoothly.
+		// Havok needs continuous graph updates to match foot placement to velocity.
 		const auto shouldApply =
 			!a_state.hasAppliedGraphState ||
-			HasDesiredStateChanged(a_state, desired) ||
+			HasDesiredStateChanged(a_state, desired);
-			desired.isMoving;
 
 		if (!shouldApply) {
 			return;
@@ -532,15 +618,11 @@ namespace F4T::ProxyAnimationSync
 		// Prepare float variables (Speed, direction, etc.)
 		snapshot.floats.resize(descriptor.GetFloatVariableCount(), 0.0F);
 		
-		// Speed: calculated from movement speed
+		const auto desired = BuildDesiredState(a_remotePlayer);
-		if (descriptor.GetFloatVariableIndex("Speed") != static_cast<std::size_t>(-1)) {
+		PopulateLocomotionSpeedSnapshot(snapshot, descriptor, desired.graphSpeed);
-			const auto desired = BuildDesiredState(a_remotePlayer);
-			snapshot.floats[descriptor.GetFloatVariableIndex("Speed")] = desired.graphSpeed;
-		}
 
 		// Direction: from remote player's heading
 		if (descriptor.GetFloatVariableIndex("direction") != static_cast<std::size_t>(-1)) {
-			const auto desired = BuildDesiredState(a_remotePlayer);
 			snapshot.floats[descriptor.GetFloatVariableIndex("direction")] = desired.direction;
 		}
 
@@ -548,17 +630,14 @@ namespace F4T::ProxyAnimationSync
 		snapshot.bools.resize(descriptor.GetBoolVariableCount(), false);
 
 		if (descriptor.GetBoolVariableIndex("isSprinting") != static_cast<std::size_t>(-1)) {
-			const auto desired = BuildDesiredState(a_remotePlayer);
 			snapshot.bools[descriptor.GetBoolVariableIndex("isSprinting")] = desired.isSprinting;
 		}
 
 		if (descriptor.GetBoolVariableIndex("isSneaking") != static_cast<std::size_t>(-1)) {
-			const auto desired = BuildDesiredState(a_remotePlayer);
 			snapshot.bools[descriptor.GetBoolVariableIndex("isSneaking")] = desired.isSneaking;
 		}
 
 		if (descriptor.GetBoolVariableIndex("isMoving") != static_cast<std::size_t>(-1)) {
-			const auto desired = BuildDesiredState(a_remotePlayer);
 			snapshot.bools[descriptor.GetBoolVariableIndex("isMoving")] = desired.isMoving;
 		}
 

plugin/src/F4TProxyPuppet.cpp

@@ -0,0 +1,157 @@
+#include "pch.h"
+
+#include "F4TProxyPuppet.h"
+
+#include "F4TNetworking.h"
+
+#include <atomic>
+#include <cmath>
+#include <iterator>
+#include <shared_mutex>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+#include <unordered_set>
+
+namespace F4T::ProxyPuppet
+{
+	namespace
+	{
+		std::shared_mutex g_proxyFormIdMutex;
+		std::unordered_set<std::uint32_t> g_proxyFormIds;
+		std::unordered_map<std::uint32_t, float> g_proxyDesiredSpeed;
+
+		bool g_hookInstalled = false;
+
+		// Actor primary-vtable index of Update(float). CommonLibF4 documents this
+		// virtual at offset 0xCF (see RE/A/Actor.h). This is the per-frame actor
+		// update that is genuinely dispatched through the vtable (unlike the
+		// internal feedback routine at 0x129, which the engine calls by direct
+		// address, so hooking its vtable slot did nothing).
+		//
+		// On a SetPosition-driven proxy this update resets the locomotion graph
+		// "Speed" to 0 (controller velocity is ~0), which is why every proxy played
+		// the slowest in-state walk. We let Update run, then re-assert our Speed.
+		constexpr std::size_t kUpdateVtableIndex = 0xCF;
+
+		// x64 has a single calling convention, so the virtual member
+		// `void Update(float)` is binary-compatible with this free function
+		// (this -> rcx, delta -> xmm1).
+		using UpdateFn = void (*)(RE::Actor*, float);
+		UpdateFn g_originalUpdate = nullptr;
+
+		std::atomic<std::uint64_t> g_hookCallCount{ 0 };
+		std::atomic<std::uint64_t> g_proxyReassertCount{ 0 };
+
+		float GetProxyDesiredSpeed(std::uint32_t a_formID)
+		{
+			const std::shared_lock lock{ g_proxyFormIdMutex };
+			const auto it = g_proxyDesiredSpeed.find(a_formID);
+			return it != g_proxyDesiredSpeed.end() ? it->second : -1.0F;
+		}
+
+		void WriteProxySpeed(RE::Actor* a_this, float a_speed)
+		{
+			if (a_speed < 0.0F || !std::isfinite(a_speed)) {
+				return;
+			}
+			auto* graphHolder = static_cast<RE::IAnimationGraphManagerHolder*>(a_this);
+			graphHolder->SetGraphVariableFloat(RE::BSFixedString{ "Speed" }, a_speed);
+			graphHolder->SetGraphVariableFloat(RE::BSFixedString{ "SpeedSampled" }, a_speed);
+		}
+
+		void UpdateHook(RE::Actor* a_this, float a_delta)
+		{
+			g_hookCallCount.fetch_add(1, std::memory_order_relaxed);
+
+			const auto isProxy = a_this && IsProxyFormID(a_this->GetFormID());
+			if (!isProxy) {
+				// Real actors (and the player, on a separate vtable) update normally.
+				g_originalUpdate(a_this, a_delta);
+				return;
+			}
+
+			const auto speed = GetProxyDesiredSpeed(a_this->GetFormID());
+
+			// Puppet model: set the networked locomotion speed, then run the actor
+			// update WITHOUT AI. The full Update's AI step recomputes/zeroes the
+			// locomotion Speed from the (near-zero, SetPosition-driven) controller
+			// velocity BEFORE the pose is generated, which is why writing Speed after
+			// Update held the value but never changed the visible cadence. UpdateNoAI
+			// is the engine's own "update minus AI" path, so the pose is generated
+			// against the Speed we set here.
+			WriteProxySpeed(a_this, speed);
+			a_this->UpdateNoAI(a_delta);
+			WriteProxySpeed(a_this, speed);
+
+			g_proxyReassertCount.fetch_add(1, std::memory_order_relaxed);
+		}
+	}
+
+	void GetHookStats(std::uint64_t& a_outTotalCalls, std::uint64_t& a_outProxySkips)
+	{
+		a_outTotalCalls = g_hookCallCount.load(std::memory_order_relaxed);
+		a_outProxySkips = g_proxyReassertCount.load(std::memory_order_relaxed);
+	}
+
+	bool Install()
+	{
+		if (g_hookInstalled) {
+			return true;
+		}
+
+		REL::Relocation<std::uintptr_t> actorVtable{ RE::Actor::VTABLE[0] };
+		g_originalUpdate = reinterpret_cast<UpdateFn>(
+			actorVtable.write_vfunc(kUpdateVtableIndex, &UpdateHook));
+
+		g_hookInstalled = g_originalUpdate != nullptr;
+
+		const auto message =
+			F4T::Networking::GetLocalPlayerLogPrefix() +
+			(g_hookInstalled
+					? " Proxy puppet Update hook installed: networked proxy locomotion Speed is re-asserted after each engine actor update."
+					: " Proxy puppet Update hook FAILED to install: original Actor::Update was null.");
+		REX::INFO(std::string_view{ message });
+
+		return g_hookInstalled;
+	}
+
+	void SetActiveProxyFormIDs(std::vector<std::uint32_t> a_formIDs)
+	{
+		std::unordered_set<std::uint32_t> updated;
+		updated.reserve(a_formIDs.size());
+		for (const auto formId : a_formIDs) {
+			if (formId != 0) {
+				updated.insert(formId);
+			}
+		}
+
+		const std::unique_lock lock{ g_proxyFormIdMutex };
+		g_proxyFormIds = std::move(updated);
+
+		// Drop desired-speed entries for proxies that are no longer active.
+		for (auto it = g_proxyDesiredSpeed.begin(); it != g_proxyDesiredSpeed.end();) {
+			it = g_proxyFormIds.contains(it->first) ? std::next(it) : g_proxyDesiredSpeed.erase(it);
+		}
+	}
+
+	void SetProxyDesiredSpeed(std::uint32_t a_formID, float a_speed)
+	{
+		if (a_formID == 0) {
+			return;
+		}
+
+		const std::unique_lock lock{ g_proxyFormIdMutex };
+		g_proxyDesiredSpeed[a_formID] = a_speed;
+	}
+
+	bool IsProxyFormID(std::uint32_t a_formID)
+	{
+		if (a_formID == 0) {
+			return false;
+		}
+
+		const std::shared_lock lock{ g_proxyFormIdMutex };
+		return g_proxyFormIds.find(a_formID) != g_proxyFormIds.end();
+	}
+}

plugin/src/main.cpp

@@ -1,8 +1,12 @@
 #include "F4TNetworking.h"
 #include "F4TLocalAnimationGraphDebug.h"
 #include "F4TProxyActorController.h"
+#include "F4TProxyAnimationSync.h"
+#include "F4TProxyPuppet.h"
 
 #include "RE/A/ACTOR_STANCE.h"
+#include "RE/B/BSFixedString.h"
+#include "RE/I/IAnimationGraphManagerHolder.h"
 
 #include <cmath>
 #include <cstdlib>
@@ -81,6 +85,21 @@ namespace
 		return RE::PlayerCharacter::GetSingleton();
 	}
 
+	float TryReadLocalAnimationGraphSpeed(RE::PlayerCharacter& a_player)
+	{
+		auto* graphHolder = static_cast<RE::IAnimationGraphManagerHolder*>(&a_player);
+		float speed = -1.0F;
+		if (graphHolder->GetGraphVariableImplFloat(
+				RE::BSFixedString{ F4T::ProxyAnimationSync::GraphVar::kSpeed },
+				speed) &&
+			std::isfinite(speed) &&
+			speed >= 0.0F) {
+			return speed;
+		}
+
+		return -1.0F;
+	}
+
 	PlayerTransform GetPlayerTransform(const RE::PlayerCharacter& a_player)
 	{
 		const auto position = a_player.GetPosition();
@@ -491,6 +510,26 @@ namespace
 			return;
 		}
 
+		const auto animationGraphSpeed =
+			networkMovementState.isMoving ? TryReadLocalAnimationGraphSpeed(*player) : -1.0F;
+
+		// Sender-side diagnostic: reveals, from whichever instance owns the log,
+		// what this local player computes and transmits while moving. Throttled.
+		{
+			static auto s_lastSendDiag = std::chrono::steady_clock::time_point{};
+			const auto now = std::chrono::steady_clock::now();
+			if (networkMovementState.isMoving &&
+				(s_lastSendDiag.time_since_epoch().count() == 0 || (now - s_lastSendDiag) >= 500ms)) {
+				s_lastSendDiag = now;
+				LogInfoWithLocalPlayerPrefix(std::format(
+					"Local send diag: isMoving={}, isSprinting={}, movementSpeed={:.1f}, localGraphSpeedRead={:.1f}.",
+					networkMovementState.isMoving,
+					networkMovementState.isSprinting,
+					networkMovementState.movementSpeed,
+					animationGraphSpeed));
+			}
+		}
+
 		// Normal movement sends more often than logs, but still avoids packet-per-frame noise.
 		const auto sentTransform = F4T::Networking::SendTransformPacket(
 			currentTransform.x,
@@ -507,7 +546,8 @@ namespace
 			networkMovementState.isSneaking,
 			networkMovementState.isJumping,
 			networkMovementState.weaponDrawn,
-			networkMovementState.movementSpeed);
+			networkMovementState.movementSpeed,
+			animationGraphSpeed);
 		if (sentTransform) {
 			lastSentTransform = currentTransform;
 			lastKnownLocation = currentLocation;
@@ -540,6 +580,11 @@ namespace
 			return;
 		}
 
+		// Install the proxy puppet hook now that the executable is loaded and REL
+		// addresses resolve. This stops the engine from recomputing (and clobbering)
+		// the networked locomotion Speed on proxy actors.
+		F4T::ProxyPuppet::Install();
+
 		// The player reference may not exist at plugin load time. A permanent task lets us
 		// check on the game thread after load, while separate send and log gates keep updates useful.
 		taskInterface->AddTaskPermanent([]() {

server/fake_player.py

@@ -48,6 +48,22 @@ ClientSnapshotProvider = Callable[[], list[dict[str, Any]]]
 WalkTargetProvider = Callable[[int], dict[str, Any] | None]
 
 
+def map_movement_speed_to_graph_speed(movement_speed: float, *, is_sprinting: bool = False) -> float:
+    """Match plugin MapMovementSpeedToGraphSpeed.
+
+    FO4 graph "Speed" shares the same world-units/sec scale as movementSpeed, so the
+    mapping is ~1:1 (clamped). Confirmed from local-player graph debug: run movementSpeed
+    ~306 lines up with graph Speed ~296-373.
+    """
+    if movement_speed < 1.0:
+        return 0.0
+
+    graph_speed = movement_speed
+    if is_sprinting:
+        graph_speed = max(graph_speed, 350.0)
+    return min(graph_speed, 500.0)
+
+
 class FakePlayerClient:
     def __init__(
         self,
@@ -537,6 +553,11 @@ class FakePlayerClient:
             "weaponDrawn": False,
             "movementSpeed": movement_speed,
         }
+        if is_moving and movement_speed >= 1.0:
+            packet["animationGraphSpeed"] = round(
+                map_movement_speed_to_graph_speed(movement_speed),
+                1,
+            )
         encoded = json.dumps(packet, separators=(",", ":")).encode("utf-8") + b"\n"
         with self._send_lock:
             connection.sendall(encoded)