Originally posted by marcocom
there is HUGE slowdown bug when enabling AnisotropicFiltering (or the TextureSharpening option.
Can you run the fillrate tests in 3dmark 2001 with AF disabled and 2x AF? Is the bug still present from the GeForce4 Ti where scores without AF are proper (multitexturing being about 2x faster than single) but when you enabled 2xAF, single and multi-texturing scores are the same?
And yes, AF causes a performance hit - but I've found I can manage what levels of AF I use to still get acceptable performance with good image quality. It's all about trial and error with the games you play.