Pretty. Why is it so laggy? Even on Phosphorus it runs at ~5 FPS: http://phosphorus.github.io/#76003612 I wouldn't have thought a few clones drawing a few lines with pen would be so slow... EDIT: I removed the clones and now it's much faster! :D EDIT 2: A small change (the pen moves over 2 pixels instead of 1 when drawing sine wave) and it now runs at almost 30 FPS for me. A few weeks ago we got to make something with Scratch in maths (yay!), so I did this. :P