diff --git a/src/AcDream.App/Input/PlayerMovementController.cs b/src/AcDream.App/Input/PlayerMovementController.cs
index a73338a..ada4855 100644
--- a/src/AcDream.App/Input/PlayerMovementController.cs
+++ b/src/AcDream.App/Input/PlayerMovementController.cs
@@ -1140,7 +1140,20 @@ public sealed class PlayerMovementController
         // early return) skips Update entirely, so reaching this line implies
         // we're in a valid in-world pose.
         _heartbeatAccum += dt;
-        HeartbeatDue = _heartbeatAccum >= HeartbeatInterval;
+        // B.6+B.7 (2026-05-15): bump heartbeat from 1 Hz to ~10 Hz while
+        // the body is actively moving (auto-walk OR user pressing W/A/S/D).
+        // ACE's server-side CreateMoveToChain polls WithinUseRadius every
+        // ~0.1 s using the latest Player.Location; 1 Hz heartbeats leave
+        // up to 1 s of stale position data on the server, which meant
+        // ACE's MoveToChain rejected our re-sent Use action as still
+        // out-of-range. With 10 Hz updates ACE sees us approaching in
+        // ~real-time and the server-side chain converges normally —
+        // retires the arrival-margin / re-send / flush-AP workarounds.
+        bool activelyMoving = _autoWalkActive
+                           || input.Forward || input.Backward
+                           || input.StrafeLeft || input.StrafeRight;
+        float effectiveInterval = activelyMoving ? 0.1f : HeartbeatInterval;
+        HeartbeatDue = _heartbeatAccum >= effectiveInterval;
         if (HeartbeatDue) _heartbeatAccum = 0f;
 
         // K-fix5 (2026-04-26): local-animation-cycle pacing. Visual rate