Hi Davide, I'm using Firefox, but I can also try it on Brave as well.
I tested the game on Firefox. Does it happen repeatably when you start the game, or you noticed the slow down gets worse after a while?
It's even quite slow even from the beginning, if you compare it with interpreters like Frotz for example or if you play it on the Amiga, but it's getting slower as long as you play.
