I have a student who has written a large amount of code to teach division. But now when he tries to edit it is very slow in responding. We have tried multiple computers and different browsers. Any ideas to help him?

When scripts get too large, they can lag quite a bit due to such a huge amount of objects in Flash (blocks) having to be moved and rendered. There is really no other way around this except splitting the script into two. Scratch unfortunately renders graphics for blocks that are currently off the screen instead of rendering while you scroll.

Thank you, don't think my student will be happy with the answer because I already suggested that to his dismay.