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→Black frame insertion
However, 240p at 120hz can create motion blur. The motion blur is due to having twice as many frames being drawn on screen. The solution is to draw a black frame every other frame, slowing down the frame rate to half. At 120hz that brings it back down to proper 60hz for emulators.
In RetroArch there is an option for black frame insertion in the video options in RGUI. This seems to make makes it draw an extra black frame for every frame and it succeeds in making the motion smooth at 120hz. There is an option for the swap interval. The only issue is that brightness is halved and any frame drops are very noticeable.
==Upscalers==
