https://bugs.freedesktop.org/show_bug.cgi?id=34156
--- Comment #2 from Dave Witbrodt dawitbro@sbcglobal.net 2011-02-12 12:43:16 PST --- (In reply to comment #1)
780c183b = http://cgit.freedesktop.org/mesa/mesa/commit/?id=780c183b8fdf2d301e1eea7f0b8... 862ebb41 = http://cgit.freedesktop.org/mesa/mesa/commit/?id=862ebb411b911f28bc93316e9e6...
I would guess it's either Marek's work on the vertex upload manager or Henri's patches for relative adressing. Since performance is involved my vote would be for Marek :)
I'm a fan of Marek's recent work, as mentioned in my off-topic comment here:
https://bugs.freedesktop.org/show_bug.cgi?id=33867#c1
I just finished bisecting this regression, and your hunch was wrong about Marek but correct about Henri. I will post my results next.