well its not just tbb, here is a jittery set of pings, tbb speedtest is perfect tho so whatever it is doesnt seem to affect throughput.
C:\Windows\system32>ping -t bbc.co.uk
Pinging bbc.co.uk [212.58.244.22] with 32 bytes of data:
Reply from 212.58.244.22: bytes=32 time=10ms TTL=56
Reply from 212.58.244.22: bytes=32 time=12ms TTL=56
Reply from 212.58.244.22: bytes=32 time=11ms TTL=56
Reply from 212.58.244.22: bytes=32 time=9ms TTL=56
Reply from 212.58.244.22: bytes=32 time=9ms TTL=56
Reply from 212.58.244.22: bytes=32 time=10ms TTL=56
Reply from 212.58.244.22: bytes=32 time=9ms TTL=56
Reply from 212.58.244.22: bytes=32 time=10ms TTL=56
Reply from 212.58.244.22: bytes=32 time=10ms TTL=56
Reply from 212.58.244.22: bytes=32 time=13ms TTL=56
Reply from 212.58.244.22: bytes=32 time=10ms TTL=56
Reply from 212.58.244.22: bytes=32 time=10ms TTL=56
Reply from 212.58.244.22: bytes=32 time=10ms TTL=56
Reply from 212.58.244.22: bytes=32 time=9ms TTL=56
Reply from 212.58.244.22: bytes=32 time=10ms TTL=56
Ping statistics for 212.58.244.22:
Packets: Sent = 15, Received = 15, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 9ms, Maximum = 13ms, Average = 10ms