Tom’s hardware have just published this.
They test various GDI drawing operations on a variety of platforms & graphics cards.
Funniest result:
An obsolete(£0?) Voodoo 4 in Win98 SE is more than 6 times faster at StretchBlt, than a state of the art £300 Radeon 5870 in XP! :
That’s quite surprising!
I may be wrong, but wasn’t the Voodoo4 back in the days of having separate 2d and 3d hardware (albeit in one card for the Voodoo4)? I’d guess that modern cards either don’t have that or it’s miserably under-developed because no-one tends to focus on it any more. No excuse for that performance though.