现在好像没有变慢吧，
Pinging 76.73.0.4 with 32 bytes of data:
Reply from 76.73.0.4: bytes=32 time=243ms TTL=50
Reply from 76.73.0.4: bytes=32 time=248ms TTL=50
Reply from 76.73.0.4: bytes=32 time=242ms TTL=50
Reply from 76.73.0.4: bytes=32 time=243ms TTL=50
Ping statistics for 76.73.0.4:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 242ms, Maximum = 248ms, Average = 244ms
