diff --git a/src/myfasthtml/auth/routes.py b/src/myfasthtml/auth/routes.py
index 9c99494..26a4cc6 100644
--- a/src/myfasthtml/auth/routes.py
+++ b/src/myfasthtml/auth/routes.py
@@ -16,6 +16,7 @@ from ..auth.utils import (
   logout_user,
   get_user_info
 )
+from ..core.instances import InstancesManager
 
 
 def setup_auth_routes(app, rt, mount_auth_app=True, sqlite_db_path="Users.db", base_url=None):
@@ -181,6 +182,9 @@ def setup_auth_routes(app, rt, mount_auth_app=True, sqlite_db_path="Users.db", b
     if refresh_token:
       logout_user(refresh_token)
     
+    # release memory
+    InstancesManager.clear_session(session)
+    
     # Clear session
     session.clear()
     
diff --git a/src/myfasthtml/controls/InstancesDebugger.py b/src/myfasthtml/controls/InstancesDebugger.py
index 5c9d8c7..7428b0d 100644
--- a/src/myfasthtml/controls/InstancesDebugger.py
+++ b/src/myfasthtml/controls/InstancesDebugger.py
@@ -8,12 +8,13 @@ class InstancesDebugger(SingleInstance):
     super().__init__(parent, _id=_id)
   
   def render(self):
+    s_name = InstancesManager.get_session_user_name
     instances = self._get_instances()
     nodes, edges = from_parent_child_list(
       instances,
-      id_getter=lambda x: f"{InstancesManager.get_session_id(x.get_session())}-{x.get_id()}",
-      label_getter=lambda x: x.get_prefix(),
-      parent_getter=lambda x: x.get_parent().get_id() if x.get_parent() else None
+      id_getter=lambda x: x.get_full_id(),
+      label_getter=lambda x: f"{s_name(x.get_session())}-{x.get_prefix()}",
+      parent_getter=lambda x: x.get_full_parent_id()
     )
     for edge in edges:
       edge["color"] = "green"
diff --git a/src/myfasthtml/core/instances.py b/src/myfasthtml/core/instances.py
index 7bab51f..cd74baa 100644
--- a/src/myfasthtml/core/instances.py
+++ b/src/myfasthtml/core/instances.py
@@ -86,6 +86,13 @@ class BaseInstance:
   def get_prefix(self) -> str:
     return self._prefix
   
+  def get_full_id(self) -> str:
+    return f"{InstancesManager.get_session_id(self._session)}-{self._id}"
+  
+  def get_full_parent_id(self) -> Optional[str]:
+    parent = self.get_parent()
+    return parent.get_full_id() if parent else None
+  
   @classmethod
   def compute_prefix(cls):
     return f"mf-{pascal_to_snake(cls.__name__)}"
@@ -177,10 +184,33 @@ class InstancesManager:
       return "** UNKNOWN USER **"
     return session["user_info"].get("id", "** INVALID SESSION **")
   
+  @staticmethod
+  def get_session_user_name(session):
+    if session is None:
+      return "** NOT LOGGED IN **"
+    if "user_info" not in session:
+      return "** UNKNOWN USER **"
+    return session["user_info"].get("username", "** INVALID SESSION **")
+  
   @staticmethod
   def reset():
     InstancesManager.instances.clear()
   
+  @staticmethod
+  def clear_session(session):
+    """
+    Remove all instances belonging to the given session.
+    :param session:
+    :return:
+    """
+    session_id = InstancesManager.get_session_id(session)
+    
+    InstancesManager.instances = {
+        key: instance
+        for key, instance in InstancesManager.instances.items()
+        if key[0] != session_id
+    }
+  
   @staticmethod
   def dynamic_get(parent: BaseInstance, component_type: str, instance_id: str):
     logger.debug(f"Dynamic get: {component_type=} {instance_id=}")
diff --git a/src/myfasthtml/core/network_utils.py b/src/myfasthtml/core/network_utils.py
index 0d2074a..bb23880 100644
--- a/src/myfasthtml/core/network_utils.py
+++ b/src/myfasthtml/core/network_utils.py
@@ -147,7 +147,7 @@ def from_parent_child_list(
     id_getter: Callable = None,
     label_getter: Callable = None,
     parent_getter: Callable = None,
-    ghost_color: str = "#ff9999",
+    ghost_color: str = "#cccccc",
     root_color: str | None = "#ff9999"
 ) -> tuple[list, list]:
   """