The script performance window's purpose is to allow scripters to see how much CPU their scripts use. This allows them to make necessary optimization to their code so that they don't hog up the CPU. To access the script performance window, to to View > Scripts in the Roblox Studio.
|Name||The name of the script.|
|Count||The number of duplicates of that script. Changing the name of those scripts won't affect this.|
|Activity||The percent of CPU power that the script and its duplicates is using.|
|Rate||How often the script is executed over the total time.|
This performance window shows the activity that each type of script is currently using. This can be used to help debug or optimize a script. According to the blog post, any activity greater than 3% is generally bad. If a script or group of scripts have a much higher activity, you should look at the script and try to optimize it. However, make sure it's pretty much done before doing this as premature optimization is a bad idea. In addition, this window can show you if an optimization you made was actually worth it. Otherwise, if a script uses very little activity most or all of the time, you can generally just leave it alone.