I have a pair of boots that came with 130 scripts in each of 4 pieces, almost all of them resize. I have other toys that take about 100 scripts, and with more than 500 running, I found that I could hardly teleport at all.
Now the boots did let you remove the resize scripts, and if fact had a script that automatically removed them after wearing thm for an hour. I wish the maker had mentioned the problem a bit more prominantly, but then again I do not always read the notecards thoroughly...
Since then, I have played around a bit and I find that somewhere around 400 scripts, I start to have trouble TP in, at least for the sims that I tend to visit. I imagine that if I were trying to TP to an empty sim, there would be less of an issue. Now that I know about the problem, I take off toys that I am not using, and usually run less than 100.