READ ALL OF THIS thx Start up the project and wait for the testing to finish. Testing may cause lag; that's normal, because 200 clones are being used for testing! In the results, you'll see statistics on how much time it took to to certain tasks with certain costumes I've picked out: a simple rectangle scratch cat a happy man 100 rectangles these are all in vector and bitmap. The tests include clone creation, rotation, movement, and effects. Have you made some costumes for a game or animation you're making, and wondering which version is the least laggy? Simply go into the sprite "TEST" and replace the preset costumes with your own. Then just rerun the project! Here's some of MY results I think are pretty interesting: Vector rotates faster and more fluidly than bitmap. Bitmap clones take less time to produce. Simple shapes are faster in vector than bitmap. Complex shapes (e.g. 200 rectangles) is vice versa. @TheLogFather for inspiration