Why is OpenGL around 30% slower now compared to 4.0-399?

[Shonumi]

@drhycodan - It would probably benefit the developers to know which games you've played and noting the exact differences in FPS. If relying on the OpenGL spec (instead of hacking around it) does indeed drop the FPS significantly on games they or most other people haven't tested, I should think they ought to know the games affected. Screenshots would be nice, but simply listing the games (with each revision tested of course) would be very helpful. As always, you can make an issue for this on Google Code (if there isn't already one?).