One thing you suddenly find on an Island is you can actually see where the scipt load is coming from. On the main grid you do not have these tools. But these tools should reside where they belong, in the Edit Window, perhaps under Content, as this is where you see the scripts.
A small window added to the Content Tab in Edit that shows script load on the item you are working on would be a good tool. This would maybe lead to a better, less laggy SL.
I would also propose LL consider a maximum value in this Time Window and shut down scripts if they exceed this maximum. This moniter would stay active even when not in edit and would shut down malicious scripts before they could do damage.