Hi there, heres my problem :
nvidia uses 3 modes : 2d, low3d and 3d performance (changing clocks)
In newer games like witcher, fallout3 etc. i suffer this problem :
2d mode (its called battery saving but dont be fooled ) : low fps, but no choppy performance
low3d, 3d perf : nice fps, but games looks like choppity - chop - chop
dunno mayb overheating or what
Try playing with the Vsync, see if the games run better with it on or off.
Download and use Rivatuner to check the GPU temperatures then repost with the info.
I`ve no idea what a safe temperature is or a laptop GPU, but I`m betting it`s lower than for a desktop, hopefully someone with more knowlage will reply with the right numbers.