We don't know whether he is talking about gba or ds games. If it's the latter, then neither vba or vba-m can run ds games.Use VBA or VBA-m and be quiet about it. I don't see why you wouldn't at this point, it plays everything.
I have no clue on this one.What is the minimum system requirements of NO$gba?
Read #32 in this FAQ thread.How can i speed up on my really slow computer?