FastAPI 的接口中使用 asyncio.Lock 效率怎么这么低？获取和释放都要几秒

app = FastAPI()
lock: Optional[asyncio.Lock] = None
spider = Spider()


@app.get('/xxx')
async def xxx(s: str):
    t1 = time()
    await lock.acquire()
    t2 = time()
    r = await spider.check(s)
    t3 = time()
    lock.release()
    t4 = time()
    logging.info(f"等待耗时{t2-t1}s,check 耗时{t3-t2}s,归还耗时{t4-t3}s")
    return r


async def main():
    log_config = generate_logging_dict()
    
    loop = asyncio.get_event_loop()
    global lock
    lock = asyncio.Lock()
    
    config = Config(app=app, loop=loop, log_config=log_config, workers=1,
                    host="0.0.0.0", port=8000)
    server = Server(config)
    
    tasks = [server.serve()]
    await asyncio.gather(*tasks)
    
    await spider.close()


if __name__ == '__main__':
    config_root_logger()
    asyncio.run(main())

获取 lock 和归还 lock 的耗时居然在 5~8s 吗？这也太奇葩了吧。 选取几次代表性的日志如下：

等待耗时 5.4836273193359375e-06s,check 耗时 1.3153741359710693s,归还耗时 8.58306884765625e-06s

等待耗时 5.9604644775390625e-06s,check 耗时 0.6164107322692871s,归还耗时 1.1205673217773438e-05s

等待耗时 6.67572021484375e-06s,check 耗时 0.5971970558166504s,归还耗时 8.344650268554688e-06s