sounds like a problem with your connection rather than the proxies, for example from here:
Reply from 62.254.32.7: bytes=32 time=20ms TTL=247
Reply from 62.254.32.7: bytes=32 time=20ms TTL=247
Reply from 62.254.32.7: bytes=32 time=20ms TTL=247
Reply from 62.254.32.7: bytes=32 time=20ms TTL=247
Reply from 62.254.32.7: bytes=32 time=20ms TTL=247
try running a speed test on
www.pcpitstop.com/internet/bandwidth.asp
and see what results you get. Make sure you have no other applications accessing the internet at the same time.
MB