Do this speed test, & post back the results now.
http://homepage.ntlworld.com/robin..../speedtest.html
Mon, 21 Jun 2004 19:39:09 UTC
1st 128K took 2594 ms = 50529 Bytes/sec = approx 420 kbits/sec
2nd 128K took 7281 ms = 18002 Bytes/sec = approx 150 kbits/sec
3rd 128K took 6735 ms = 19461 Bytes/sec = approx 162 kbits/sec
4th 128K took 6218 ms = 21079 Bytes/sec = approx 175 kbits/sec
It starts off OK (but still not quite 600k) then gets worse.