Click the greenflag. It will fill random rectangles for one second, then the variable "Rectangle Per Second" will show the total number of rectangles drawn in one second. Turbowarp: https://turbowarp.org/553990729?hqpen&turbo
All code by me. Rectangles per second I got: on scratch: 33 on scratch with turbomode: 860 on turbowarp: 33 on turbowarp with turbomode: 9000 on turbowarp with high quality pen: 33 on turbowarp with the both: 9300 You can choose the direction of the rectangles in the custom block.