help multitabling lags my computer

[mr_tea]

Hi, I multitable around 28 tables and sometimes my computer lags. I have a 2.66Ghz dual, and 1.5gb of ram so i doubt there is a problem there. My video card is horrible though, 96mg. I was wondering could this be the reason for the lagging? I want to use pokertracker while playing all these tables and i'm afraid it's going to lag and time me out so i have no yet tested it.