NVIDIA 319.12 PRIME USING RANDR 1.4
eric@gensokyo:~$ vblank_mode=0 glxspheres
Polygons in scene: 62464
Visual ID of window: 0x6f
Context is Direct
OpenGL Renderer: GeForce GT 555M/PCIe/SSE2
240.628184 frames/sec - 268.541053 Mpixels/sec
255.514229 frames/sec - 285.153880 Mpixels/sec
254.978469 frames/sec - 284.555971 Mpixels/sec
234.015015 frames/sec - 261.160756 Mpixels/sec

BUMBLEBEE USING PRIMUS
eric@gensokyo:~$ vblank_mode=0 primusrun glxspheres
Polygons in scene: 62464
Visual ID of window: 0x20
Context is Direct
OpenGL Renderer: GeForce GT 555M/PCIe/SSE2
166.975935 frames/sec - 186.345143 Mpixels/sec
169.147715 frames/sec - 188.768850 Mpixels/sec
168.329014 frames/sec - 187.855180 Mpixels/sec
167.852190 frames/sec - 187.323044 Mpixels/sec

BUMBLEBEE USING VIRTUALGL
eric@gensokyo:~$ vblank_mode=0 optirun glxspheres
Polygons in scene: 62464
Visual ID of window: 0x20
Context is Direct
OpenGL Renderer: GeForce GT 555M/PCIe/SSE2
97.377857 frames/sec - 108.673688 Mpixels/sec
98.361743 frames/sec - 109.771705 Mpixels/sec
101.052992 frames/sec - 112.775139 Mpixels/sec
99.608778 frames/sec - 111.163396 Mpixels/sec