Whenever I'm nearing the end of a project, the performance always starts slowing down. This makes it harder to tell how fast something is actually moving and it ruins the experience of the player as well. How can I prevent this?
Just a guess, but maybe your clones are making clones, so the total number of clones grows exponentially? That is, you have a MAKE A CLONE block in a script that you think only the original sprite is running, but actually all the clones run it also.