yeah i have the same problem with the beta as well, and it is NOT the video card, i have an nvidia geforce 6600gt, and trust me its WELL overclocked, almost all the way both core and mem, so there would be no problems with GUI, everything else works beautifully yet when i open limewire and ONLY limewire, lag galore, this has to be a LW problem.

system:

AMD64 3700 @ 2.5ghz
1gb mushkin
dfi lan party nf4 ultra-D motherboard
6600gt

there is absolutely NO reason that LW should be this CPU/mem intensive, that is just beyond me, perhaps there is an error in the coding, but i havent had this problem until recently, to tell you the truth, this is a new system, and when i installed limewire i even let it install the java for me, so that just shows its a programming problem, so if you have any suggestions, tell me.

also, would there be a chance of a 64bit version of LW?