https://bugs.freedesktop.org/show_bug.cgi?id=31635
--- Comment #2 from Marek Olšák maraeo@gmail.com 2010-11-15 13:16:47 PST --- I thought we had SSE2 vertex shaders for 64-bit too, but apparently it's disabled. I won't investigate further because there is also LLVM. Can you recompile mesa with --enable-gallium-llvm? It should make everything a lot faster for you.