Lets you run projects at more frames per second (FPS) so they look smoother. Hold Alt and click the green flag to toggle between Scratch's default 30 FPS and a custom framerate set below.

Workaround=Turbo Mode, but that puts projects at 60 FPS. Also moving sprites using the motions blocks at the time could go out of whack.

Use Turbowarp with the settings I set. To change FPS, go to Advanced and click 60 FPS (not the checkmark unless you want to change it back to 30 FPS). This is a super common workaround.