python-Websocket的性能随着线程的增加而降低

我是websockets/线程新手，希望能在调试websockets的性能问题时得到一些帮助。请参阅下面的代码——如果我包含额外的线程——我的websocket性能将受到影响。如果我删除线程，websocket的性能将非常好。如何保持线程和websocket的良好性能？我应该调整线程的优先级还是什么？

import websocket
import threading
import json
import datetime

class Trading():

    # Stores the message in memory
    def on_message_binance(self, ws, message):
        #print(message)
        self.message = message

    def start(self):

        self.tower = []

        binance_stream = dict()
        binance_stream['BTC'] = 'wss://stream.binance.com:9443/stream?streams=btcusdt@trade'

        threads = dict()
        self.message = ''
        threads['ws'] = websocket.WebSocketApp(binance_stream['BTC'],
                                                      on_message=lambda ws, msg: self.on_message_binance(self, ws, msg))

        # Launch the thread
        threads['thread'] = threading.Thread(target=threads['ws'].run_forever, name='BTC')
        threads['thread'].daemon = True
        threads['thread'].start()

        # ************************************************
        # IF THESE LINES ARE INCLUDED - WEBSOCKETS WILL BE DELAYED. COMMENT OUT TO REMOVE DELAYS
        for x in range(20):
            threads[x] = threading.Thread(target=self.wheee, args=(self, 1), name=x)
            threads[x].daemon = True
            threads[x].start()
        # ************************************************

        prior_binmsg = ''
        while True:

            # Ensure that you don't continously read the same message over and over again
            binmsg = self.message
            if (binmsg != prior_binmsg):
                prior_binmsg = binmsg
                binancemsg = json.loads(binmsg)
                curtime_GMT = datetime.datetime.now().timestamp()
                timestamp = float(binancemsg['data']['T'])/1000

                delay = curtime_GMT - timestamp
                print('Websocket delay = ' + str(delay))

    def wheee(self, num):
        import time
        while True:
            wheeeeeeee = num

if __name__ == '__main__':
    # Start trading!
    x = Trading
    x.start(x)