Ok… your barton is ats 2.1ghz thats around 3000xp (rating) so thats not your limiting factor anyway.
You said u did a reinstall if so im guessing your system. What modle of motherboard do you have? If it has a VIA chipset make shure you install the VIA 4n1 drivers (now known as hypertron or some crap), if its a nfoce chipset be shure to visit nvidia.com to get the latest drivers from there.
As for video driver’s since yu said you have a g4 i wouldnt recomend any of the 50.+ drivers as thay are all made for the FX range, best sticking to an older set of 40+ det’s.
Your G4 (if its a real G4 and not an MX) should have no trouble at all running ET with your current CPU. Infact in most case’s your cpu could still be the limiting factor (as mine is with my 9800pro). You should beable to run ET @ 1024rez everything max without a problem at over 76fps (i cap mine there) most of the time.
Anyway just to recap… make shure u have the motherboard drivers installed as it sounds like you forgot that when you did a reinstall :), also creative sound drivers can cause ET to have pause spike’s and a fragmented h/d could also cause low frame rates.
ops something i forgot, my ET did that when i imaged my 40gig h/d over to my 80gig ( to save installing windows blabla), man did that kill practicly anything i did and a full format/reinstall was requierd to fix.