Why does the screen accelerate on some computers, while others slow down.

[LeonidasHypnos]

Is there any way to unify their speed？

[hlorenzi]

I'm not totally sure since I haven't worked on this for years, but it's probably because I'm not checking the delta-time argument passed to the requestAnimationFrame callback, in the runFrameJS function. The code is assuming the callback is executed at 60 fps, so if your system runs it differently, you might see slow-downs or speed-ups.