i have that problem too. it slows down drastically, for some reason when i changed it to the 'windows theme'.

here's my specs:
OS: Windows XP Professional SP2
Limewire: 4.10.9
JSE Runtime Environment 5.0 Update 6 (aka 1.5.0 update 6)
RAM: 2 x 1GB Kingston PC4200 DDR2
Harddrive: 200GB Seagate 7200rpm 8MB SATA II HDD
Video Card: 128MB Leadtek QuadroFX 540
Firewall: SP2 firewall
Router/Modem: D-Link DSL-502T


can anyone help?