Does what it says it does and pretty nicely too. Saves about 10% of Admin loading times for us.
Seems you can pretty safely select everything, click Save All, then selectively remove if you find any missing Admin functionality.
Doesn't matter too much which way you do it though, it works if you have a rough idea what you're doing and can remember to check back to this if you do then find and Admin issues from missing scripts.
Worth using in conjunction with Query Monitor and Query Monitor Extend (from GitHub).