Each seed has a different speed or speed boost, or is there a secret technique? Coins affect something??

The improvement comes from RNG, the way the clouds/spaces are generated, it's like food drop, sometimes there is 3 foods close to each other, in this case, sometimes the spaces are shorter, which is rthe most opitimal.

How do I use the glitch in the game?

@Kaiozin269 what glitch?

Well in the video as you can see, the jump time to the platform is much faster than in the normal game, and also because the table says glitched