glxgears without vsync / vertical sync - more than 60fps

If you have a slow FPS rate while benchmarking with glxgears try the following export infront of the test.
The warning:

Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.

is a indicator that you still have vertical sync active.

The following code should disable vsync (for the instance of the terminal):

export __GL_SYNC_TO_VBLANK=0
export vblank_mode=0