well,ever since i got factions its done nothing but laag and/or take like 2-3mins to load a town,outpost or area, after its loaded i laag like hell for say 30 secs and then im fine,but it'l start to laag again when i walk but not as bad as when i zone,now after awhile im fine no-lag

but then a fight begins and i laag like hell again for like 10 secs and then im fine this is only on factions as prophicies works fine for me , what i dont under stand is that they have the same minimum specs yet factions runs slow for me
this is my specs,not much ram i know..
intel(r)
celeron(R) CPU 2.66GHZ
2.67GHz 256 mb of ram
i guess my question is why do i laag on factions and not prophicies, and should i buy i new gfx card with more ram and will that fix my problem?