1) delta time is calculated with forever {delta = timer - last time, last time = timer} 2) delta timer framerate is calculated with rounding 1 / delta (Example) if you want to rotate 5 degrees every delta (30 fps) and keep the same rotational speed on fps change, you'll need "delta * (target fps * rotation speed for target fps)" so "delta * (30 * 5)" (delta calculation shown in 1) also with correct configuration, the delta framerate could also bypass turbo mode and keep itself at a stable level