telnet线程的Python速度非常慢

Question

使用telnet应用线程时，Python运行非常慢，尽管按顺序运行（不带线程）时速度很快，请在下面的代码中为我提供帮助。

def login(node):
    global tn
    global response
    response = None
    tn  = telnetlib.Telnet(node, timeout=10)
    print()
    idx, obj, response = tn.expect([b"Password: "],20)
    if idx == -1:
        sys.exit(response.decode('ascii'))
    print('telnet success @{}'.format(node))
    tn.write(b'ericsson' + b'\r')
    idx, obj, response = tn.expect([b'>'],20)
    if idx == -1:
        sys.exit(response.decode('ascii'))
    tn.write(b'enable' +b'\r\n')
    idx, obj, response = tn.expect([b"Password: "],20)
    if idx == -1:
        sys.exit(response.decode('ascii'))
    tn.write(b'ericsson' + b'\r\n')

q = queue.Queue()
for i in lst_nodes[12:20]: #put some tasks in the queue
    q.put(i)

def worker(item):        
        loop_on_nodes(item) #make some tasks
        q.task_done()
for i in range(5):
     item = q.get_nowait()
     print(item)
     t = threading.Thread(target=worker, args=(item,))
     t.daemon = True
     t.start()
q.join() #block until all tasks are done