I haven't been able to try them out but have heard about tools available to island owners. It would be nice if we could get in client the specific stats of the chosen script. Hmmmm kind of like Texture stats but much more detail. Something like that would make it possible for us to make even better scripts and help performance.
The only choices we have now is scripting in free memory calls or going to an empty sim and getting a little bit of data from the performance stats. I personally would like to know how much strain each of my own scripts puts on simulator. More importantly would be to see the performance of one revision against another revision.