Extreme lag after importing game to itch.io

Hello!

I’m spending some time playing around with making a game. I have nothing in it execept the player and a few planes to make a room.

The game runs perfectly in the editor and even after I build it, it still runs extemely good (+500 fps).

When I upload it to itch.io, however, if you download it from there and run it, it runs extremly bad, it’s like you’re running it on 3 fps. I have no idea why, I tried to download it from the itch.io page that I uploaded it to and it still worked fine. It just becomes bad when I download it on other PCs, I tired a laptop and my brothers very good PC.

This is the link for the game: Gm#1 - First-Person Platformer game by Rodolf

It’s about 21.6 mb if you wanna try downloading it. It’s not really a game, but I wanted to test importing it before I kept working, and it seems it was a good idea.

I just tried out and it works just fine, over 200fps