How to Fix Lag on Undertale
Try running Undertale in compatibility mode and make sure your graphics drivers are up to date! Sometimes lowering the resolution helps too!
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Disable background programs eating up your CPU. Nobody needs 47 Chrome tabs open while playing Undertale!
Hot take: Just get a better PC, lol.
Cheap fix: play in windowed mode. Performance boost guaranteed.
First-hand experience: I had the same issue on my laptop. Turned off Vsync in the game's settings, worked like a charm!
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