The original project with a better project description is over here: https://scratch.mit.edu/projects/250914490/ Fix/Update: Now it will only create new points if you move the mouse pointer. If you hold it still, no new point will get created. This should reduce the chance of any future lag issues.
@MabonBaladevaKain - Everything It is a very useful base project for many things including but not limited to moving drawings around the screen by adding to the x and y list values in order to change the positions of the lines. An experiment where you can see this happen: https://scratch.mit.edu/projects/243168811/
