I bought a Core I7 2600 3.4GHz (not overclocked), 8GB RAM DDR3 1333MHz and GeForce GTX 570HD 2.5GB VRAM. using HLSL makes games kinda choppy. turn it off and MAME is fine.
I did a clean install. Using Win7 Ultimate 64-bit with MAME64 (official builds).
maybe I'm just unlucky. I only enable hlsl in mame.in, nothing more.