On an FB3, that rate is the actual refresh rate on the laser, so it gives you an indication of when things will be flickering. On a QM2000, due to the sub-optimal way in which we currently communicate between BEYOND and the QM2000, that rate indicates the rate at which the QM2000 is consuming data from BEYOND, and has nothing to do with the refresh rate on the laser.
Actually, a much more useful display will be the number of points, not the FPS, since that will always be accurate regardless of the hardware being used. If you right-click in this area, you will see that you can choose between FPS and Points currently being output.
Best regards,
William Benner