I did your test.. and let say I didn't like what I saw.. But after I calm down.. I begin to say, NP.. it just need a boost.. and I be on my way back to WARP speed..
Here is the info that you said you need..
Windows XP home ed.
Comcast.. beleive the 4MB .. 4000/256
tweak test
http://ttester.broadbandreports.com/tweak/block:bab06?service=cable&speed=4000&os=winXP&via=normal
Im using Firefox..
:::.. Download Stats ..:::
Connection is:: 2470 Kbps about 2.5 Mbps (tested with 5983 kB)
Download Speed is:: 302 kB/s
Tested From:: https://testmy.net/ (server1)
Test Time:: Sun Aug 21 2005 16:45:50 GMT-0400 (Eastern Daylight Time)
Bottom Line:: 44X faster than 56K 1MB download in 3.39 sec
Diagnosis: May need help : running at only 60.08 % of your hosts average (Comcast.net)
Validation Link:: https://testmy.net/stats/id-P6BOZN3TI