this has been an age old problem for my computer! even back when I has a TNT2 vanta. when I play diablo 2 it will run fine when I start it up and then after a while it starts to run really slowly!!!!!! and then after a little while it runs fine. this is like one of my favorite RPGs and its really pissing me off!
heres my system info...
athlon thunderbird 1000MHz
512MB pc133 SDRAM
maxtor 60GB harddrive
windows XP professional
VIA chipset
ASUS HP mobo
Geforce2 mx400 soon to be geforce3 ti500