diff --git a/packages/frontend/assets/room/objects/tabletop-digital-clock/tabletop-digital-clock.blend b/packages/frontend/assets/room/objects/tabletop-digital-clock/tabletop-digital-clock.blend
index b87880e629..aadf509692 100644
Binary files a/packages/frontend/assets/room/objects/tabletop-digital-clock/tabletop-digital-clock.blend and b/packages/frontend/assets/room/objects/tabletop-digital-clock/tabletop-digital-clock.blend differ
diff --git a/packages/frontend/assets/room/objects/tabletop-digital-clock/tabletop-digital-clock.glb b/packages/frontend/assets/room/objects/tabletop-digital-clock/tabletop-digital-clock.glb
index b3c2393b1d..b15ee7c411 100644
Binary files a/packages/frontend/assets/room/objects/tabletop-digital-clock/tabletop-digital-clock.glb and b/packages/frontend/assets/room/objects/tabletop-digital-clock/tabletop-digital-clock.glb differ
diff --git a/packages/frontend/src/world/room/objects/ceilingFanLight.ts b/packages/frontend/src/world/room/objects/ceilingFanLight.ts
index 3628245142..032fdfae30 100644
--- a/packages/frontend/src/world/room/objects/ceilingFanLight.ts
+++ b/packages/frontend/src/world/room/objects/ceilingFanLight.ts
@@ -33,7 +33,7 @@ export const ceilingFanLight = defineObject({
 				]);
 				rotor.animations = [anim];
 				animationObserver = scene.onAfterAnimationsObservable.add(() => {
-					room?.sr.updateMesh([rotor, ...rotor.getChildMeshes()]);
+					room?.sr.updateMesh([rotor, ...rotor.getChildMeshes()], false);
 				});
 				scene.beginAnimation(rotor, 0, 100, true);
 			},
diff --git a/packages/frontend/src/world/room/objects/radiometer.ts b/packages/frontend/src/world/room/objects/radiometer.ts
index 506c5fb651..9e23a1223a 100644
--- a/packages/frontend/src/world/room/objects/radiometer.ts
+++ b/packages/frontend/src/world/room/objects/radiometer.ts
@@ -31,7 +31,7 @@ export const radiometer = defineObject({
 				]);
 				vanes.animations = [anim];
 				animationObserver = scene.onAfterAnimationsObservable.add(() => {
-					room?.sr.updateMesh([...vanes.getChildMeshes()]);
+					room?.sr.updateMesh([...vanes.getChildMeshes()], true);
 				});
 				scene.beginAnimation(vanes, 0, 240, true);
 			},
diff --git a/packages/frontend/src/world/room/objects/tabletopDigitalClock.ts b/packages/frontend/src/world/room/objects/tabletopDigitalClock.ts
index f6060ce838..77ec0f9728 100644
--- a/packages/frontend/src/world/room/objects/tabletopDigitalClock.ts
+++ b/packages/frontend/src/world/room/objects/tabletopDigitalClock.ts
@@ -34,6 +34,7 @@ export const tabletopDigitalClock = defineObject({
 	},
 	placement: 'top',
 	hasCollisions: false,
+	canPreMeshesMerging: false,
 	createInstance: ({ root, room, options, model, scene, timer }) => {
 		const light = new BABYLON.SpotLight('', new BABYLON.Vector3(0, cm(3), cm(1)), new BABYLON.Vector3(0, 0, 1), Math.PI / 1, 2, scene, room?.lightContainer != null);
 		light.parent = root;
@@ -106,18 +107,15 @@ export const tabletopDigitalClock = defineObject({
 
 					for (const mesh of Object.values(segmentMeshes)) {
 						const isVisible = onMeshes.includes(mesh);
-						// 本当ならisVisibleで制御したいが、snapshot renderingではvisibilityはupdateMeshを呼んだとしても反映されないので、メッシュをめっちゃ縮めることで非表示を実現する(メッシュをめっちゃ遠くに飛ばすことも試みたけど、シーン全体の影のレンダリングがおかしくなるため断念。あとバウンディングボックスが大きくなるから不都合が出そう)
-						//mesh.isVisible = isVisible;
-						mesh.scaling.y = isVisible ? 1 : 0;
+						mesh.isVisible = isVisible;
 					}
 
 					for (const mesh of colonMeshes) {
 						const isVisible = Date.now() % 2000 < 1000;
-						// 本当ならisVisibleで制御したいが、snapshot renderingではvisibilityはupdateMeshを呼んだとしても反映されないので、メッシュをめっちゃ縮めることで非表示を実現する(メッシュをめっちゃ遠くに飛ばすことも試みたけど、シーン全体の影のレンダリングがおかしくなるため断念。あとバウンディングボックスが大きくなるから不都合が出そう)
-						//mesh.isVisible = isVisible;
-						mesh.scaling.y = isVisible ? 1 : 0;
+						mesh.isVisible = isVisible;
 					}
 
+					// なぜか反映されない。バグ？ https://forum.babylonjs.com/t/visibility-of-instancedmesh-is-not-reflected-under-fast-snapshot-rendering/63251
 					room?.sr.updateMesh([...Object.values(segmentMeshes), ...colonMeshes]);
 				}, 1000);
 			},
diff --git a/packages/frontend/src/world/room/objects/wallClock.ts b/packages/frontend/src/world/room/objects/wallClock.ts
index b57a137004..7546a9f619 100644
--- a/packages/frontend/src/world/room/objects/wallClock.ts
+++ b/packages/frontend/src/world/room/objects/wallClock.ts
@@ -48,7 +48,7 @@ export const wallClock = defineObject({
 					const mAngle = -(minutes / 60) * Math.PI * 2;
 					hourHand.rotation = new BABYLON.Vector3(0, 0, hAngle);
 					minuteHand.rotation = new BABYLON.Vector3(0, 0, mAngle);
-					room?.sr.updateMesh([hourHand, minuteHand]);
+					room?.sr.updateMesh([hourHand, minuteHand], false);
 				}, 1000);
 			},
 			onOptionsUpdated: ([k, v]) => {