Lately I have been having FPS and lag problems in games, specifically non-demanding games. These games include: GTA San Andreas, No More Room in Hell, Counter Strike Global Offensive, Farcry 2, Minecraft, Skyrim, and a slightly more demanding game; Contagion. I'll include a list below showing specific problems in these games, but first I'll list my computer specifications. BTW: All my drivers are up to date.
Windows 7 64 bit
8gb Ram
Nvidea Geforce GT 640 2gb DDR3
Intel Core 2 Quad Q6600 2.4 ghz
GTA San Andreas - All max settings, I get around 70-120 fps average, but I get mouse lag in specific areas on the map
No More Room in Hell - All max, slight stuttering and sometimes mouse lag
CS: GO - All Medium settings, I get usually a constant 60 fps, but when I put it on high/max settings, my fps drops drastically and I get mouse lag(I pass recommended requirements?)
Farcry2 - All medium/high settings, I get mouse lag and fps issues, usually only about 30-35 fps on average, and mouse lag in MANY places on the map (usually the merc camps and whatnot)
Minecraft - All normal settings, major stuttering issues when sprinting, fps issues, I usually get about 50-60 fps on average but it does drop often (mostly when sprinting)
Skyrim - All medium/high settings, about 30-40 fps average, some mouse lag, some stuttering
Contagion - All medium/high settings, low fps, stuttering
I'm wondering why I can't max out all these games, and is there a way to fix the lag issues?
Added (1). Is there a way to fix the lag issues without lowering my settings, is what I mean lol. I mean, I don't care TOO much about how the game looks, as long as it looks good I'll be happy haha. I know that the graphics don't make a game good, the gameplay does. But I pass the recommended requirements for all these games, I should be able to run them on all max settings with a 1440x900 resolution, right?