diff --git a/packages/frontend/assets/room/objects/issyoubin/issyoubin.blend b/packages/frontend/assets/room/objects/issyoubin/issyoubin.blend
index f9254d2706..1b2a028fe1 100644
Binary files a/packages/frontend/assets/room/objects/issyoubin/issyoubin.blend and b/packages/frontend/assets/room/objects/issyoubin/issyoubin.blend differ
diff --git a/packages/frontend/assets/room/objects/issyoubin/issyoubin.glb b/packages/frontend/assets/room/objects/issyoubin/issyoubin.glb
index cb904c40fb..0c813239de 100644
Binary files a/packages/frontend/assets/room/objects/issyoubin/issyoubin.glb and b/packages/frontend/assets/room/objects/issyoubin/issyoubin.glb differ
diff --git a/packages/frontend/src/pages/room.vue b/packages/frontend/src/pages/room.vue
index fc869198cf..99799cc312 100644
--- a/packages/frontend/src/pages/room.vue
+++ b/packages/frontend/src/pages/room.vue
@@ -278,13 +278,18 @@ function rotate() {
 }
 
 async function addObject(ev: PointerEvent) {
+	// 重いので止める
+	controller.pauseRender();
 	const { dispose } = await os.popupAsyncWithDialog(import('./room.add-object-dialog.vue').then(x => x.default), {
 	}, {
 		ok: async (res) => {
 			controller.addObject(res);
 			canvas.value!.focus();
 		},
-		closed: () => dispose(),
+		closed: () => {
+			controller.resumeRender();
+			dispose();
+		},
 	});
 }
 
diff --git a/packages/frontend/src/world/room/controller.ts b/packages/frontend/src/world/room/controller.ts
index 465865da58..8cecbe3e00 100644
--- a/packages/frontend/src/world/room/controller.ts
+++ b/packages/frontend/src/world/room/controller.ts
@@ -175,6 +175,22 @@ export class RoomController {
 		await this.init(canvas ?? this.canvas!, workerMode);
 	}
 
+	public pauseRender() {
+		if (this.worker != null) {
+			this.worker.postMessage({ type: 'pauseRender' });
+		} else if (this.engine != null) {
+			this.engine.pauseRender();
+		}
+	}
+
+	public resumeRender() {
+		if (this.worker != null) {
+			this.worker.postMessage({ type: 'resumeRender' });
+		} else if (this.engine != null) {
+			this.engine.resumeRender();
+		}
+	}
+
 	public enterEditMode() {
 		if (this.worker != null) {
 			this.worker.postMessage({ type: 'enterEditMode' });
diff --git a/packages/frontend/src/world/room/engine.ts b/packages/frontend/src/world/room/engine.ts
index 771e941695..ed7f59d214 100644
--- a/packages/frontend/src/world/room/engine.ts
+++ b/packages/frontend/src/world/room/engine.ts
@@ -448,30 +448,7 @@ export class RoomEngine extends EventEmitter<RoomEngineEvents> {
 			this.sr.enableSnapshotRendering();
 		}
 
-		if (this.fps == null) {
-			this.engine.runRenderLoop(() => {
-				this.scene.render();
-			});
-		} else {
-			let then = 0;
-			const interval = 1000 / this.fps;
-
-			const renderLoop = (timeStamp: number) => {
-				if (this.disposed) return;
-
-				window.requestAnimationFrame(renderLoop);
-
-				const delta = timeStamp - then;
-				if (delta <= interval) return;
-				then = timeStamp - (delta % interval);
-
-				this.engine.beginFrame();
-				this.scene.render();
-				this.engine.endFrame();
-			};
-
-			window.requestAnimationFrame(renderLoop);
-		}
+		this.startRenderLoop();
 
 		this.domEvents.on('keydown', (ev) => {
 			if (ev.code === 'KeyE') {
@@ -555,6 +532,47 @@ export class RoomEngine extends EventEmitter<RoomEngineEvents> {
 		});
 	}
 
+	private currentRafId: number | null = null;
+
+	private startRenderLoop() {
+		if (this.fps == null) {
+			this.engine.runRenderLoop(() => {
+				this.scene.render();
+			});
+		} else {
+			let then = 0;
+			const interval = 1000 / this.fps;
+
+			const renderLoop = (timeStamp: number) => {
+				if (this.disposed) return;
+
+				this.currentRafId = window.requestAnimationFrame(renderLoop);
+
+				const delta = timeStamp - then;
+				if (delta <= interval) return;
+				then = timeStamp - (delta % interval);
+
+				this.engine.beginFrame();
+				this.scene.render();
+				this.engine.endFrame();
+			};
+
+			this.currentRafId = window.requestAnimationFrame(renderLoop);
+		}
+	}
+
+	public pauseRender() {
+		this.engine.stopRenderLoop();
+		if (this.currentRafId != null) {
+			window.cancelAnimationFrame(this.currentRafId);
+			this.currentRafId = null;
+		}
+	}
+
+	public resumeRender() {
+		this.startRenderLoop();
+	}
+
 	public selectObject(objectId: string | null) {
 		if (SNAPSHOT_RENDERING) this.sr.disableSnapshotRendering(); // snapshot rendering中にbake/unbakeするとエラーになる。なおこのメソッドは参照カウント方式な点に留意
 
@@ -1659,6 +1677,10 @@ export class RoomEngine extends EventEmitter<RoomEngineEvents> {
 	}
 
 	public destroy() {
+		if (this.currentRafId != null) {
+			window.cancelAnimationFrame(this.currentRafId);
+			this.currentRafId = null;
+		}
 		this.timer.dispose();
 		this.engine.dispose();
 		this.disposed = true;
diff --git a/packages/frontend/src/world/room/objects/issyoubin.ts b/packages/frontend/src/world/room/objects/issyoubin.ts
index 77891a137f..aa8dfbe866 100644
--- a/packages/frontend/src/world/room/objects/issyoubin.ts
+++ b/packages/frontend/src/world/room/objects/issyoubin.ts
@@ -19,6 +19,10 @@ export const issyoubin = defineObject({
 	hasCollisions: false,
 	hasTexture: true,
 	createInstance: ({ model, options, scene }) => {
+		const liquidMesh = model.findMesh('__X_LIQUID__');
+		const liquidMaterial = model.findMaterial('__X_LIQUID__');
+		const bottleMaterial = model.findMaterial('__X_BOTTLE__');
+
 		// 以下を行うとレンダリングのグリッチが直るが、残念ながらWebGPUかつNCMでは動作しない
 		// https://doc.babylonjs.com/setup/support/webGPU/webGPUOptimization/webGPUNonCompatibilityMode/#dodont-in-non-compatibility-mode-ncm
 		//for (const m of model.root.getChildMeshes()) {
@@ -26,6 +30,10 @@ export const issyoubin = defineObject({
 		//		(m.material as BABYLON.PBRMaterial).separateCullingPass = true;
 		//	}
 		//}
+
+		// しょうがないので不透明にする
+		bottleMaterial.transparencyMode = BABYLON.PBRMaterial.PBRMATERIAL_ALPHATEST;
+
 		return {
 			onOptionsUpdated: ([k, v]) => {
 			},