Just a note, I saw this on Scratch 1.4, not 2.0.

If you make a small script, say this one:

if <(a) < [64]> then
change [a v] by (1)
go to x: (pick random (-200) to (200)) y: (pick random (-140) to (140))
stamp
end

and join 64 copies of them together, I noticed that if you try to scroll through the monster you've just created you're very likely to crash, but if all of it is in a c-loop, then it will lag a lot, but it won't crash.

Why's that?

stop [all v] ::stack