i can't spot the difference between mashing on windows version and mashing on linux version they seem 100% identical to me

there's a difference in frames. you wont notice because it's hard to tell.

It's just you.

in the windows version if you press z/enter and then the other button without letting go of the first one you pressed your input will be eaten (same thing happens with x and shift) so if you let go of the buttons as soon as possible when mashing it will be the same speed on both versions, its only easier on linux not technically faster