Scratch is slower than your grandma, and that's a fact. Please use TurboWarp (https://turbowarp.org/fullscreen.html#441414507) for actually running shaders. XD
So, I just needed a second project to become "Scratcher" It's not the most efficient way to port shaders, but meh, it's at least a convenient way. I'd love to see people remix with some shaders they port, although it would probably just be a single frame.