Graphics.frame_rate:
In [Smooth Mode], the number of times the screen is
refreshed per second. The larger the value, the more CPU power is
required. Normally set at 40. When not in [Smooth Mode], the refresh
rate is halved, and graphics are drawn in every other frame.
Changing this property is not recommended; however, it can be set
anywhere from 10 to 120. Values out of range are automatically
corrected.
Graphics.frame_rate = {VALUE}