diff --git a/packages/frontend/src/utility/room/engine.ts b/packages/frontend/src/utility/room/engine.ts
index a85fce2154..c8cdeca04e 100644
--- a/packages/frontend/src/utility/room/engine.ts
+++ b/packages/frontend/src/utility/room/engine.ts
@@ -32,7 +32,7 @@ import { reactive, ref, shallowRef, triggerRef, watch } from 'vue';
 import { genId } from '../id.js';
 import { deepClone } from '../clone.js';
 import { getObjectDef } from './object-defs.js';
-import { HorizontalCameraKeyboardMoveInput, applyMorphTargetsToMesh, findMaterial } from './utility.js';
+import { HorizontalCameraKeyboardMoveInput, applyMorphTargetsToMesh, camelToKebab, findMaterial } from './utility.js';
 import * as sound from '@/utility/sound.js';
 
 // babylonのドメイン知識は持たない
@@ -185,7 +185,6 @@ class ModelManager {
 	}
 
 	public updated() {
-		this.bakeMesh();
 	}
 
 	public bakeMesh() {
@@ -252,6 +251,21 @@ class ModelManager {
 			console.error('Failed to bake mesh for object', this.root.metadata?.objectType, err);
 		}
 	}
+
+	public unbakeMesh() {
+		for (const m of this.bakedMeshes) {
+			m.dispose();
+		}
+		this.bakedMeshes = [];
+
+		const childMeshes = this.root.getChildMeshes();
+
+		for (const mesh of childMeshes) {
+			mesh.setEnabled(true);
+		}
+
+		this.bakedCallback?.(this.root.getChildMeshes());
+	}
 }
 
 type ObjectDef<OpSc extends OptionsSchema = OptionsSchema> = {
@@ -610,10 +624,17 @@ export class RoomEngine {
 
 				for (const entity of this.objectEntities.values()) {
 					entity.instance.resetTemporaryState?.();
+					entity.model.unbakeMesh();
 				}
 			} else {
-				this.selectionOutlineLayer.dispose();
-				this.selectionOutlineLayer = null;
+				if (this.selectionOutlineLayer != null) {
+					this.selectionOutlineLayer.dispose();
+					this.selectionOutlineLayer = null;
+				}
+
+				for (const entity of this.objectEntities.values()) {
+					entity.model.bakeMesh();
+				}
 			}
 		});
 
@@ -970,14 +991,6 @@ export class RoomEngine {
 	}) {
 		const def = getObjectDef(args.type);
 
-		// ex) hangingTShirt -> hanging-t-shirt
-		const camelToKebab = (s: string) => {
-			return s
-				.replace(/([a-z0-9])([A-Z])/g, '$1-$2')
-				.replace(/([A-Z])([A-Z][a-z])/g, '$1-$2')
-				.toLowerCase();
-		};
-
 		const root = new BABYLON.TransformNode(`object_${args.id}_${args.type}`, this.scene);
 
 		const loaderResult = await BABYLON.LoadAssetContainerAsync(`/client-assets/room/objects/${camelToKebab(args.type)}/${camelToKebab(args.type)}.glb`, this.scene);
@@ -1053,7 +1066,7 @@ export class RoomEngine {
 					}
 				}
 
-				this.scene.addMesh(mesh);
+				if (!this.scene.meshes.includes(mesh)) this.scene.addMesh(mesh);
 			}
 		});
 
@@ -1566,14 +1579,6 @@ export class RoomObjectPreviewEngine {
 	}) {
 		const def = getObjectDef(args.type);
 
-		// ex) hangingTShirt -> hanging-t-shirt
-		const camelToKebab = (s: string) => {
-			return s
-				.replace(/([a-z0-9])([A-Z])/g, '$1-$2')
-				.replace(/([A-Z])([A-Z][a-z])/g, '$1-$2')
-				.toLowerCase();
-		};
-
 		const root = new BABYLON.Mesh(`object_${args.type}`, this.scene);
 
 		const loaderResult = await BABYLON.LoadAssetContainerAsync(`/client-assets/room/objects/${camelToKebab(args.type)}/${camelToKebab(args.type)}.glb`, this.scene);
@@ -1632,7 +1637,7 @@ export class RoomObjectPreviewEngine {
 						}
 					}
 
-					this.scene.addMesh(mesh);
+					if (!this.scene.meshes.includes(mesh)) this.scene.addMesh(mesh);
 				}
 			}),
 		});
diff --git a/packages/frontend/src/utility/room/objects/blind.ts b/packages/frontend/src/utility/room/objects/blind.ts
index 38523a8d6c..fa99748f77 100644
--- a/packages/frontend/src/utility/room/objects/blind.ts
+++ b/packages/frontend/src/utility/room/objects/blind.ts
@@ -49,7 +49,7 @@ export const blind = defineObject({
 		const blade = model.findMesh('Blade');
 		blade.rotation = new BABYLON.Vector3(options.angle, 0, 0);
 
-		let blades = [] as BABYLON.Mesh[];
+		let blades = [] as BABYLON.InstancedMesh[];
 
 		const applyOpeningState = () => {
 			for (const b of blades) {
@@ -58,7 +58,7 @@ export const blind = defineObject({
 			blades = [];
 
 			for (let i = 0; i < options.blades; i++) {
-				const b = blade.clone();
+				const b = blade.createInstance('blade_' + i);
 				if (i / options.blades < temp.open) {
 					b.position.y -= (i * 4/*cm*/) / WORLD_SCALE;
 				} else {
diff --git a/packages/frontend/src/utility/room/utility.ts b/packages/frontend/src/utility/room/utility.ts
index 7c1a63eb9c..6abd1ab3d6 100644
--- a/packages/frontend/src/utility/room/utility.ts
+++ b/packages/frontend/src/utility/room/utility.ts
@@ -543,3 +543,11 @@ export function applyMorphTargetsToMesh(mesh: BABYLON.Mesh) {
 	mesh.refreshBoundingInfo();
 	mesh.computeWorldMatrix(true);
 }
+
+// ex) hangingTShirt -> hanging-t-shirt
+export const camelToKebab = (s: string) => {
+	return s
+		.replace(/([a-z0-9])([A-Z])/g, '$1-$2')
+		.replace(/([A-Z])([A-Z][a-z])/g, '$1-$2')
+		.toLowerCase();
+};