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by ricardobeat 5124 days ago
> due to high-speed filming

The laggy footage starting at 0:28 looks like real-time to me. You can see the crosshair falling behind at 0:35 too, and that's clearly normal speed unless the guy can do handwriting in slow-motion. And I can't think of any way a high framerate would affect the perception of lag when played in realtime.