diff --git a/apps/editor/components/editor/index.tsx b/apps/editor/components/editor/index.tsx
index 2a2b0bc7..ce675101 100644
--- a/apps/editor/components/editor/index.tsx
+++ b/apps/editor/components/editor/index.tsx
@@ -28,7 +28,7 @@ export default function Editor() {
       <ActionMenu />
       <PanelManager />
 
-      <SidebarProvider className="fixed z-100">
+      <SidebarProvider className="fixed z-20">
         <AppSidebar />
       </SidebarProvider>
       <Viewer selectionManager="custom">
diff --git a/apps/editor/components/ui/panels/item-panel.tsx b/apps/editor/components/ui/panels/item-panel.tsx
index f9c086be..bed39a58 100644
--- a/apps/editor/components/ui/panels/item-panel.tsx
+++ b/apps/editor/components/ui/panels/item-panel.tsx
@@ -29,7 +29,9 @@ export function ItemPanel() {
 
       // Mark parent wall as dirty if item is attached to wall
       if (node.asset.attachTo === 'wall' && node.parentId) {
-        useScene.getState().dirtyNodes.add(node.parentId as AnyNode['id'])
+        requestAnimationFrame(() => {
+          useScene.getState().dirtyNodes.add(node.parentId as AnyNode['id'])
+        })
       }
     },
     [selectedId, node, updateNode],
diff --git a/apps/editor/components/ui/primitives/number-input.tsx b/apps/editor/components/ui/primitives/number-input.tsx
index d2c6a30b..eb6659ef 100644
--- a/apps/editor/components/ui/primitives/number-input.tsx
+++ b/apps/editor/components/ui/primitives/number-input.tsx
@@ -64,8 +64,13 @@ export function NumberInput({
 
         const deltaValue = deltaX * step
         const newValue = clamp(startValueRef.current + deltaValue)
-        finalValue = Number.parseFloat(newValue.toFixed(precision))
-        onChange(finalValue)
+        const newFinalValue = Number.parseFloat(newValue.toFixed(precision))
+
+        // Only call onChange if value actually changed (avoid extra processing on tiny moves)
+        if (newFinalValue !== finalValue) {
+          finalValue = newFinalValue
+          onChange(finalValue)
+        }
       }
 
       const handleMouseUp = () => {
diff --git a/apps/editor/components/ui/sidebar/panels/site-panel/index.tsx b/apps/editor/components/ui/sidebar/panels/site-panel/index.tsx
index 67aa1d74..54581749 100644
--- a/apps/editor/components/ui/sidebar/panels/site-panel/index.tsx
+++ b/apps/editor/components/ui/sidebar/panels/site-panel/index.tsx
@@ -345,6 +345,7 @@ function LevelsSection() {
   const nodes = useScene((state) => state.nodes);
   const createNode = useScene((state) => state.createNode);
   const updateNode = useScene((state) => state.updateNode);
+  const deleteNode = useScene((state) => state.deleteNode);
   const selectedBuildingId = useViewer((state) => state.selection.buildingId);
   const selectedLevelId = useViewer((state) => state.selection.levelId);
   const setSelection = useViewer((state) => state.setSelection);
@@ -493,6 +494,15 @@ function LevelsSection() {
                 >
                   References
                 </button>
+                {level.level !== 0 && (
+                  <button
+                    className="flex items-center gap-2 w-full px-3 py-1.5 rounded text-sm hover:bg-accent hover:text-red-600 cursor-pointer"
+                    onClick={() => deleteNode(level.id)}
+                  >
+                    <Trash2 className="w-3.5 h-3.5" />
+                    Delete
+                  </button>
+                )}
               </PopoverContent>
             </Popover>
           </div>
diff --git a/bun.lock b/bun.lock
index 93c676af..5ed59f8c 100644
--- a/bun.lock
+++ b/bun.lock
@@ -1,6 +1,5 @@
 {
   "lockfileVersion": 1,
-  "configVersion": 0,
   "workspaces": {
     "": {
       "name": "editor",
@@ -63,13 +62,14 @@
     },
     "packages/core": {
       "name": "@pascal-app/core",
-      "version": "0.1.10",
+      "version": "0.1.11",
       "dependencies": {
         "dedent": "^1.7.1",
         "idb-keyval": "^6.2.2",
         "mitt": "^3.0.1",
         "nanoid": "^5.1.6",
         "three-bvh-csg": "^0.0.17",
+        "three-mesh-bvh": "^0.9.8",
         "zod": "^4.3.5",
         "zundo": "^2.3.0",
         "zustand": "^5",
@@ -127,7 +127,7 @@
     },
     "packages/viewer": {
       "name": "@pascal-app/viewer",
-      "version": "0.1.10",
+      "version": "0.1.11",
       "dependencies": {
         "zustand": "^5",
       },
diff --git a/packages/core/package.json b/packages/core/package.json
index a7b98961..9adac83f 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -33,6 +33,7 @@
     "mitt": "^3.0.1",
     "nanoid": "^5.1.6",
     "three-bvh-csg": "^0.0.17",
+    "three-mesh-bvh": "^0.9.8",
     "zod": "^4.3.5",
     "zundo": "^2.3.0",
     "zustand": "^5"
diff --git a/packages/core/src/systems/wall/wall-system.tsx b/packages/core/src/systems/wall/wall-system.tsx
index 8042b1da..1b7394be 100644
--- a/packages/core/src/systems/wall/wall-system.tsx
+++ b/packages/core/src/systems/wall/wall-system.tsx
@@ -21,6 +21,7 @@ const csgEvaluator = new Evaluator()
 // WALL SYSTEM
 // ============================================================================
 
+let useFrameNb = 0;
 export const WallSystem = () => {
   const dirtyNodes = useScene((state) => state.dirtyNodes)
   const clearDirty = useScene((state) => state.clearDirty)
@@ -33,7 +34,7 @@ export const WallSystem = () => {
     // Collect dirty walls and their levels
     const dirtyWallsByLevel = new Map<string, Set<string>>()
 
-    
+    useFrameNb += 1;    
     dirtyNodes.forEach((id) => {
       const node = nodes[id]
       if (!node || node.type !== 'wall') return
@@ -106,6 +107,7 @@ function updateWallGeometry(wallId: string, miterData: WallMiterData) {
   const node = nodes[wallId as WallNode['id']]
   if (!node || node.type !== 'wall') return
 
+
   const mesh = sceneRegistry.nodes.get(wallId) as THREE.Mesh
   if (!mesh) return