求助 tornado 写的 websocket cpu 占用 100%

几个客户端一连接 cpu 就飙升到最高，且客户端断开也不降，
求助代码有啥问题，或者有什么别的 websocket 方案么，
下面是代码

from abc import ABC

from tornado import websocket, web, ioloop, httpserver, gen
from tornado.options import define, options

define("port", default=9040, help="run on the given port", type=int)

class WebSocketHandler(websocket.WebSocketHandler, ABC):

    # CORS
    def check_origin(self, origin):
        return True

    def open(self):
        self.write_message({'code': 0, 'message': '连接成功'})

    async def on_message(self, message):
        user = self.get_argument('user', '')
        if not user:
            await self.write_message({'code': 411, 'message': '缺少用户 id'})
        else:
            while True:
                try:
                    await self.write_message({'code': 0, 'user': user})
                    await gen.sleep(3)
                except websocket.WebSocketClosedError:
                    self.on_close()

    def on_close(self):
        pass


class HealthyCheckHandler(web.RequestHandler, ABC):
    def get(self):
        self.write("Hello, world")


def make_app():
    return web.Application([
        ("/v1/ws/message", WebSocketHandler),
        ("/v1/ws/healthycheck", HealthyCheckHandler)
    ])


def main():
    ws_app = make_app()
    options.parse_command_line()
    server = httpserver.HTTPServer(ws_app)
    server.listen(options.port)
    ioloop.IOLoop.current().start()


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        pass
    finally:
        ioloop.IOLoop.current().stop()
        ioloop.IOLoop.current().close(True)