diff --git a/src/runtime-three/runtime-host.ts b/src/runtime-three/runtime-host.ts
index 81597e05..6076496f 100644
--- a/src/runtime-three/runtime-host.ts
+++ b/src/runtime-three/runtime-host.ts
@@ -191,9 +191,11 @@ import {
   type DialogueAttentionSideSign
 } from "./dialogue-attention-camera";
 import {
-  applyRuntimeProjectScheduleToControlState,
-  resolveRuntimeProjectScheduleState
-} from "./runtime-project-scheduler";
+  commitRuntimeScheduleSyncResult,
+  createRuntimeScheduleSyncContext,
+  syncRuntimeSceneScheduleToClock,
+  type RuntimeScheduleSyncContext
+} from "./runtime-schedule-sync";
 import {
   THIRD_PERSON_CAMERA_COLLISION_RADIUS,
   ThirdPersonNavigationController
@@ -212,11 +214,6 @@ import type {
   RuntimeTerrain,
   RuntimeTeleportTarget
 } from "./runtime-scene-build";
-import {
-  applyActorScheduleStateToNpcDefinition,
-  buildRuntimeNpcCollider,
-  createRuntimeNpcFromDefinition
-} from "./runtime-scene-build";
 import {
   resolveDefaultTargetCycleInput,
   resolvePlayerStartClearTargetInput,
@@ -534,10 +531,6 @@ function dampAngleDegrees(
   );
 }
 
-function isNonNull<T>(value: T | null): value is T {
-  return value !== null;
-}
-
 export interface RuntimeSceneLoadState {
   status: "loading" | "ready" | "error";
   message: string | null;
@@ -740,6 +733,7 @@ export class RuntimeHost {
   private desiredNavigationMode: RuntimeNavigationMode = "thirdPerson";
   private sceneReady = false;
   private currentWorld: RuntimeSceneDefinition["world"] | null = null;
+  private runtimeScheduleSyncContext: RuntimeScheduleSyncContext | null = null;
   private currentAdvancedRenderingSettings: AdvancedRenderingSettings | null =
     null;
   private advancedRenderingComposer: EffectComposer | null = null;
@@ -1082,6 +1076,8 @@ export class RuntimeHost {
 
     this.sceneReady = false;
     this.runtimeScene = runtimeScene;
+    this.runtimeScheduleSyncContext =
+      createRuntimeScheduleSyncContext(runtimeScene);
     this.currentWorld = runtimeScene.world;
     this.activeScheduledImpulseRoutineIds.clear();
     this.syncRuntimeClockState(runtimeScene.time);
@@ -1335,6 +1331,7 @@ export class RuntimeHost {
     this.advancedRenderingComposer = null;
     this.currentAdvancedRenderingSettings = null;
     this.scene.fog = null;
+    this.runtimeScheduleSyncContext = null;
     this.currentClockState = null;
     this.lastPublishedClockState = null;
     this.activeScheduledImpulseRoutineIds.clear();
diff --git a/src/runtime-three/runtime-schedule-sync.ts b/src/runtime-three/runtime-schedule-sync.ts
index f1d50fba..d8dd3cbc 100644
--- a/src/runtime-three/runtime-schedule-sync.ts
+++ b/src/runtime-three/runtime-schedule-sync.ts
@@ -16,7 +16,7 @@ import {
 export interface RuntimeScheduleSyncContext {
   readonly runtimeScene: RuntimeSceneDefinition;
   readonly pathsById: ReadonlyMap<string, RuntimeSceneDefinition["paths"][number]>;
-  readonly actorIds: readonly string[];
+  readonly actorIds: string[];
   readonly actorStatesByActorId: ReadonlyMap<
     string,
     RuntimeResolvedActorScheduleState
@@ -214,7 +214,7 @@ export function syncRuntimeSceneScheduleToClock(options: {
   const resolvedScheduler = resolveRuntimeProjectScheduleState({
     scheduler: runtimeScene.scheduler.document,
     sequences: runtimeScene.sequences,
-    actorIds: [...context.actorIds],
+    actorIds: context.actorIds,
     dayNumber: clock.dayCount + 1,
     timeOfDayHours: clock.timeOfDayHours,
     pathsById: context.pathsById