So I made an FPS counter that actually works. Normally, Scratch runs on 30 FPS, but if more things start to run, it can start dropping to 20 FPS or even 10 FPS! If you want to test it, you can click the cat to make it clone as many times as you want. A few clones wont affect the FPS, but as you increase the number of clones, you will notice it dropping.
Original - FPS Counter ( @Octoria )