async def start_progress_updates(self) -> None:
        """
        Because progress updates can be very frequent, we do not necessarily want to send a message per update.
        Rather, we check for progress updates at regular intervals, and send a message if there is a pending update.
        Consecutive progress updates between sends will overwrite each other so only the most recent update will be sent.
        """
        while not self.stopped:
            events = [evt for job in self.active_jobs if job is not None for evt in job]

            if len(events) == 0:
                await asyncio.sleep(self.progress_update_sleep_when_free)
                continue

            for event in events:
                if event.progress_pending and event.progress:
                    event.progress_pending = False
                    self.send_message(event, event.progress)

            await asyncio.sleep(self.progress_update_sleep_when_free)

        Because progress updates can be very frequent, we do not necessarily want to send a message per update.
        Rather, we check for progress updates at regular intervals, and send a message if there is a pending update.
        Consecutive progress updates between sends will overwrite each other so only the most recent update will be sent.
        
gradio/queueing.py