diff --git a/potassium/potassium.py b/potassium/potassium.py
index 694330d..b4ae24a 100644
--- a/potassium/potassium.py
+++ b/potassium/potassium.py
@@ -102,6 +102,7 @@ def __init__(self, name):
         self._worker_pool = None
 
         self.event_handler_thread = Thread(target=self._event_handler, daemon=True)
+        self.event_handler_thread.start()
 
         self._status = PotassiumStatus(
             num_started_inference_requests=0,
@@ -240,13 +241,6 @@ def handle(path):
                     status=resp.status,
                     headers=resp.headers
                 )
-
-                def on_close():
-                    print("on_close")
-                    self._response_mailbox.cleanup(internal_id)
-               
-                flask_response.call_on_close(on_close)
-
             elif endpoint.type == "background":
                 self._worker_pool.apply_async(run_worker, args=(endpoint.func, req, internal_id))
 
diff --git a/potassium/status.py b/potassium/status.py
index 72b4da7..3693866 100644
--- a/potassium/status.py
+++ b/potassium/status.py
@@ -35,7 +35,7 @@ def sequence_number(self):
 
     @property
     def idle_time(self):
-        if not self.gpu_available:
+        if not self.gpu_available or len(self.in_flight_request_start_times) > 0:
             return 0
         return time.time() - self.idle_start_timestamp
 
@@ -53,7 +53,7 @@ def update(self, event):
         event_data = event[1:]
         if event_type not in event_handlers:
             raise Exception(f"Invalid event {event}")
-        return event_handlers[event](self.clone(), *event_data)
+        return event_handlers[event_type](self.clone(), *event_data)
 
 
     def clone(self):
@@ -91,7 +91,7 @@ def handle_worker_started(status: PotassiumStatus):
     StatusEvent.INFERENCE_REQUEST_RECEIVED: handle_inference_request_received,
     StatusEvent.INFERENCE_START: handle_start_inference,
     StatusEvent.INFERENCE_END: handle_end_inference,
-    StatusEvent.WORKER_STARTED: lambda status: status,
+    StatusEvent.WORKER_STARTED: handle_worker_started
 }
 
 
diff --git a/potassium/worker.py b/potassium/worker.py
index 6f30d12..ee3a65e 100644
--- a/potassium/worker.py
+++ b/potassium/worker.py
@@ -62,7 +62,7 @@ def init_worker(index_queue, event_queue, response_queue, init_func):
     else:
         context = init_func(worker_num)
 
-    event_queue.put((StatusEvent.WORKER_STARTED, worker_num))
+    event_queue.put((StatusEvent.WORKER_STARTED,))
 
     worker = Worker(
         context,