eek
Naw do'nt play with modem strings or MTU settings, screw them up and yer fubar'd for good. I played with my MTU settings once, got it perfect for FPS games but web surfing and downloading was a complete shambles, so I just leave it now.
As for tweaking I think my system runs well enough now thanks but any tips you have on making phx's puter think its lagging would be greatly appreciated *mutters "bloody LPB's" and smirks*