Sitkatara

I have searched everywhere but there is no definite answer I can find, so...

In reference to lag, does having .tga's in the primary UI slow a system down? Now to explain. I modified the group window to have all the invientory slots. The background choices I have are A_recessed_box (or something like that), and A_(whateverslot like hands)_box. There is only 1 tga for recessed box and 20, 22, something like that different item slots. Basically it would be like running around with the inventory window open all the time. Reason I am asking is I will modify the itemboxes .tga file to what I want if it would have no effect. And I am running a P3 650MHz w/ 386 MB, so even small differences are exaggerated. Any ideas?

Thanks