https://bugs.freedesktop.org/show_bug.cgi?id=28517
--- Comment #18 from Tom Stellard tstellar@gmail.com 2010-08-25 07:32:59 PDT --- (In reply to comment #17)
The performance decrease you are seeing is because the correct vertex shaders are being used now instead of dummy shaders.
I should add that there are still some optimizations that can be done with vertex shader loops, but I can't really predict how much these optimizations will improve performance.