I have a black macbook late 2008.
It lags when im on straight and narrow, and everywhere else is somewhat decent, but still laggy nonetheless.
On 1280 x 800 (lowered) and 1 Graphics.
Intel GMA X3100:
Chipset Model: GMA X3100
VRAM (Total): 144 MB
Vendor: Intel (0x8086)
it runs SOOOO smooth on the start/menu screen though.