Avoid calling time.monotonic on coordinator refresh unless we are debugging (#70209)

homeassistant/helpers/update_coordinator.py

@@ -183,6 +183,7 @@ class DataUpdateCoordinator(Generic[_T]):
         if scheduled and self.hass.is_stopping:
             return
 
+        if log_timing := self.logger.isEnabledFor(logging.DEBUG):
             start = monotonic()
         auth_failed = False
 
@@ -255,6 +256,7 @@ class DataUpdateCoordinator(Generic[_T]):
                 self.logger.info("Fetching %s data recovered", self.name)
 
         finally:
+            if log_timing:
                 self.logger.debug(
                     "Finished fetching %s data in %.3f seconds (success: %s)",
                     self.name,