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: For X3 mode, it is recommended to lock your game's base framerate at 1/3 of your monitor's refresh rate (e.g., lock at 40 FPS for a 120Hz monitor).

It analyzes consecutive frames to insert "fake" intermediate frames, smoothing out motion. A game running at 30 FPS can look like it's running at 60 or even 90 FPS. Key Features of Version 2.9 (v2.9)