When I try to play games on my grandma's PC, certain games always run really slow. Ace of spades and BL work fine, but I'm more concerned about FPSes like battlefield and star wars battlefront. When I play BFBC2 in single player, it lags so much, even on low settings, that I can hardly aim at an enemy, and it only stops lagging if I look up at the sky. This is in single player, remember.
The strange thing is, I think it has to do with the monitor, and not the computer. The computer is just a year or two old, but the monitor is a crappy, clunky old Dell that predates 2004. The computer is also a gateway with an Intel i5 chip. I don't know about the RAM, but it's either 1 gig or 4 gigs.
Tl;dr, my grandma has a decent computer and a stuff monitor, FPSes lag, and I'm pretty sure it's the monitor.
Any explanations or suggestions for new monitors?