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I'm not sure about that one nether as my friend who has a terrible laptop played the game and can make the jump too.
It might be possible that your computer is just not going through the specific frame needed for the jump but I really doubt it. I think it's just a really hard jump. I struggle to make the jump myself and i've tried it hundreds of times.

It's in the description of the game. it's not an impossible jump. just a very very hard one. probably a single frame jump. level 3 has really hard jumps too. I've tested all jumps multiple times though so I'm sure they're not impossible. just very very hard to time. It was designed specifically like that as it only has 3 levels and I was trying to see how hard I could make some sections for prototyping.