Okay, I have updated the game, and it is running a lot faster!
https://schmidt-workshops.itch.io/the-horror-in-the-museum

If you download Version 0.06 you can try it. Press TAB to switch from pixel graphics to full resolution and see the fps counter.

I think you will be surprised laugh

See my games here: https://www.indiedb.com/company/michael-klaus-schmidt