mongodb motor 异步操作比同步操作的时间要慢？

import asyncio

from motor.motor_asyncio import AsyncIOMotorClient

import time

client = AsyncIOMotorClient('10.18.6.46',27001) # 不知道为什么会更加慢 ！

start=time.time()

db = client['spider']

doc=db.jd_book

async def run():

    result_list = doc.find({})

    for item in await result_list.to_list(length=291589):

        idx = item.get('_id')

        # print(idx)

        await doc.update_one({'_id': idx}, {'$set': {'temp_v': 200}})





loop = asyncio.get_event_loop()

loop.run_until_complete(run())

print(f'time used {time.time()-start}')

import pymongo

docs = pymongo.MongoClient('10.18.6.46',27001)['spider']['jd_book']

start=time.time()

for doc in docs.find():

    idx=doc.get('_id')

    docs.update_one({'_id':idx},{'$set':{'temp_v':300}})

print(f'time used {time.time()-start}')