I have the new update, but I still have the belt, and I noticed no change in speed whatsoever. Maybe it's because I'm playing it on the itch app I downloaded, instead of opening up the rar file. Also, you can buy a laptop-compatible mouse at the store like Best Buy or Walmart that you can attach to your laptop. It saves you all the trouble of painful stinging touch-pad radiation.
Viewing post in Advanced Education with Viktor Strobovski comments
After you run, you still go at a relatively fast speed, faster than whenever you breath. Usually you slow down to a very slow speed and in order to speed up again you must breath, but now breathing feels useless. Also, I am playing on my laptop on vacation and I couldn't find the belt anywhere, so yeah, I am stuck without it. I don't mind, though, because I don't play on my laptop, I play on my PC at home.