diff --git a/ssbo_component/ssbo_editor.py b/ssbo_component/ssbo_editor.py
index d440117e..fa9c6b75 100644
--- a/ssbo_component/ssbo_editor.py
+++ b/ssbo_component/ssbo_editor.py
@@ -78,6 +78,11 @@ class SSBOEditor:
         self.pick_mask = BitMask32.bit(29)
         self.pick_buffer = None
         self._empty_pick_scene = NodePath("ssbo_pick_empty")
+        # Avoid heavy per-frame sync for huge group selections.
+        self._pick_sync_bg_limit = 256
+        self._last_group_sync_mat = None
+        self._last_single_sync_gid = None
+        self._last_single_sync_mat = None
         
         # Initialize ImGui Backend if not already present
         if not hasattr(self.base, 'imgui_backend'):
@@ -389,6 +394,11 @@ class SSBOEditor:
         self._sync_pick_transforms()
         return task.cont
 
+    def _reset_pick_sync_cache(self):
+        self._last_group_sync_mat = None
+        self._last_single_sync_gid = None
+        self._last_single_sync_mat = None
+
     def _matrices_close(self, a, b, eps=1e-5):
         """Small helper for robust matrix change detection."""
         for r in range(4):
@@ -424,6 +434,45 @@ class SSBOEditor:
         if not self.controller:
             return
         self._sync_pick_root_transform()
+        if not self.selected_ids:
+            return
+
+        # Group selection can contain thousands of objects.
+        # Only resync when proxy transform has changed.
+        proxy = getattr(self, "_group_proxy", None)
+        if proxy and not proxy.is_empty() and len(self.selected_ids) > 1:
+            proxy_world = proxy.get_mat(self.base.render)
+            if self._last_group_sync_mat and self._matrices_close(proxy_world, self._last_group_sync_mat):
+                return
+            self._last_group_sync_mat = LMatrix4f(proxy_world)
+        else:
+            self._last_group_sync_mat = None
+
+        if len(self.selected_ids) == 1:
+            gid = self.selected_ids[0]
+            obj_np = self.controller.id_to_object_np.get(gid)
+            pick_np = self.controller.id_to_pick_np.get(gid)
+            if not (obj_np and pick_np and not obj_np.is_empty() and not pick_np.is_empty()):
+                return
+            obj_world_mat = obj_np.get_mat(self.base.render)
+            if (
+                self._last_single_sync_gid == gid and
+                self._last_single_sync_mat and
+                self._matrices_close(obj_world_mat, self._last_single_sync_mat)
+            ):
+                return
+            self._last_single_sync_gid = gid
+            self._last_single_sync_mat = LMatrix4f(obj_world_mat)
+            pick_world_mat = pick_np.get_mat(self.base.render)
+            if not self._matrices_close(obj_world_mat, pick_world_mat):
+                pick_np.set_mat(self.base.render, obj_world_mat)
+                chunk_id = self.controller.id_to_chunk.get(gid)
+                if chunk_id is not None and chunk_id in self.controller.chunks:
+                    self.controller.chunks[chunk_id]["dirty"] = True
+            return
+
+        self._last_single_sync_gid = None
+        self._last_single_sync_mat = None
         for gid in self.selected_ids:
             obj_np = self.controller.id_to_object_np.get(gid)
             pick_np = self.controller.id_to_pick_np.get(gid)
@@ -440,6 +489,7 @@ class SSBOEditor:
 
     def clear_selection(self):
         self._stop_pick_sync_task()
+        self._reset_pick_sync_cache()
         self._cleanup_group_proxy()
         self.selected_name = None
         self.selected_ids = []
@@ -488,6 +538,7 @@ class SSBOEditor:
     def select_node(self, key):
         # Clean up previous group proxy before changing selection
         self._cleanup_group_proxy()
+        self._reset_pick_sync_cache()
 
         self.selected_name = key
         self.selected_ids = self.controller.name_to_ids.get(key, [])
@@ -532,7 +583,12 @@ class SSBOEditor:
             obj_np.wrt_reparent_to(proxy)
 
         self._transform_gizmo.attach(proxy)
-        self._start_pick_sync_task()
+        # For huge groups, avoid per-frame full sync; we still sync on demand
+        # right before picking via pick_object().
+        if len(valid) <= self._pick_sync_bg_limit:
+            self._start_pick_sync_task()
+        else:
+            self._stop_pick_sync_task()
 
     def _rebuild_filtered_tree_rows(self):
         """
diff --git a/ui/panels/editor_panels.py b/ui/panels/editor_panels.py
index 860d22ca..f1d9379b 100644
--- a/ui/panels/editor_panels.py
+++ b/ui/panels/editor_panels.py
@@ -468,8 +468,33 @@ class EditorPanels:
         
             # 处理节点选择
             if imgui.is_item_clicked():
+                # In SSBO mode, clicking model root should finally bind gizmo to
+                # SSBO group proxy (not legacy model root). So run legacy
+                # selection first, then force SSBO root selection at the end.
+                force_ssbo_root_key = None
+                ssbo_editor_ref = None
+                try:
+                    ssbo_editor = getattr(self.app, "ssbo_editor", None)
+                    controller = getattr(ssbo_editor, "controller", None) if ssbo_editor else None
+                    ssbo_model = getattr(ssbo_editor, "model", None) if ssbo_editor else None
+                    root_key = getattr(controller, "tree_root_key", None) if controller else None
+                    if (
+                        ssbo_editor and controller and ssbo_model and node == ssbo_model
+                        and root_key and root_key in controller.tree_nodes
+                    ):
+                        force_ssbo_root_key = root_key
+                        ssbo_editor_ref = ssbo_editor
+                except Exception:
+                    pass
+
                 if hasattr(self.app, 'selection') and self.app.selection:
                     self.app.selection.updateSelection(node)
+
+                if force_ssbo_root_key and ssbo_editor_ref:
+                    try:
+                        ssbo_editor_ref.select_node(force_ssbo_root_key)
+                    except Exception:
+                        pass
                 # Clear LUI selection when a scene node is selected
                 if hasattr(self.app, 'lui_manager'):
                     self.app.lui_manager.selected_index = -1