(Asking here since the game's forums are empty)

TLDR:
Does getting both optimizations affect anything other than turning on both elevator lights next to each level. i.e Will it give you different endinigs, unlock extras/levels or whatever?

The long version:
While optimizing for size (instruction size) is fun, optimizing for speed seems to often require resorting to loop unrolling. This unfortunately can get tedious, since other than trial and error there is no way to know what loop size will give you best results given the input samples on which average is calculated. The graphical interface, the lack of ability to simply type code or copy/paste individual lines and the ugly spaghetti than ensues doesn't help matters. Which is why I'd happily avoid it if all it gives you is a switched on light next to the elevator.

Oh, I know that. And I usually build 2 solutions, one optimized for speed and another for size. It's just that while it's fun figuring out the smallest solution, and even getting a "generally fast" solution is fun too, trying to beat the fast challenge often involves tedious loop unrolling through trial and error. Not fun.

And not having text labels, everything has to be drawn... a bit annoying.