Greetings, Scratcher Turbo mode is recommended (shift-click the flag) as well as fullscreen. I just changed the equations for my burning ship fractal. I guess I've accidentally made a zoomable fractal engine: just change the equations in the 'iterate' custom block. Feel free to use as long as you give credit!
All code by me, @CasTur For more fractals: https://scratch.mit.edu/studios/27203848/