Quote Originally Posted by Zajec View Post
I wonder if worse performance can be related to the more features (or even higher OpenGL version?) exposed. Game could use them and performance would decrease then.

Is there any easy way of disabling some feature to make OpenGL support the same between that 2 drivers?
http://www.mesa3d.org/envvars.html
MESA_GL_VERSION_OVERRIDE for OpenGL Version
MESA_EXTENSION_MAX_YEAR to limit advertised extensions by year they came out
MESA_EXTENSION_OVERRIDE can be used for adding or removing advertised extensions e.g. MESA_EXTENSION_OVERRIDE=-GL_ARB_get_program_binary glxinfo