diff --git a/tinygrad/device.py b/tinygrad/device.py
index 1a02e28f46..4a001066c3 100644
--- a/tinygrad/device.py
+++ b/tinygrad/device.py
@@ -436,8 +436,7 @@ class HCQCompiled(Compiled):
     """
     Translates local gpu time (timestamp) into global cpu time.
     """
-    if is_copy: return self.copy_cpu_start_time_us + (gpu_time - self.copy_gpu_start_time_us)
-    return self.cpu_start_time_us + (gpu_time - self.gpu_start_time_us)
+    return gpu_time + (self.gpu2cpu_copy_time_diff if is_copy else self.gpu2cpu_compute_time_diff)
 
   def _prof_setup(self):
     if not hasattr(self, 'profile_logger'): atexit.register(self._prof_finalize)
@@ -448,9 +447,8 @@ class HCQCompiled(Compiled):
       self.timeline_value += 1
       cpu_start_time = time.perf_counter_ns() / 1e3
       self.timeline_signal.wait(self.timeline_value - 1)
-      return cpu_start_time, self.timeline_signal.timestamp
-    self.cpu_start_time_us, self.gpu_start_time_us = _sync_queue(self.hw_compute_queue_t)
-    self.copy_cpu_start_time_us, self.copy_gpu_start_time_us = _sync_queue(self.hw_copy_queue_t)
+      return cpu_start_time - self.timeline_signal.timestamp
+    self.gpu2cpu_compute_time_diff, self.gpu2cpu_copy_time_diff = _sync_queue(self.hw_compute_queue_t), _sync_queue(self.hw_copy_queue_t)
 
   def _prof_process_events(self):
     self.raw_prof_records += [(st.timestamp, en.timestamp, name, is_cp) for st, en, name, is_cp in self.sig_prof_records]