Maybe the problem is not the performances of the loop/code, but an edge case the provoke an infinite loop...

("Edge cases"... g964 play A LOT with those...)

Exactly this same. My code runs 0.016 seconds for 20000+ bounces in my shell, anyone having any ideas?

I use the while loop in which I multiply height by bounce.
while height > window:

I have the same problem by using Python.Confusing...

Did you see the note:

Note: Don't forget to convert the percent parameter as a percentage in the body of your function: if the parameter percent is 2 you have to convert it to 0.02.

Anyway, thanks!