Too many times have I gotten to the mix and master stage of a project with limiters and other plugins adding a lot of latency to groups. Then I want to play something in with the keyboard, but with a huge lag it makes it too difficult to play in time. Even when mixing, that lag is making even the play button less responsive. So when I saw this plugin I had to get it.
Immediately it showed me which groups and tracks were adding the most delay... and sure enough on those channels were many deactivated plugins that were still adding latency.
After going through the worst offending tracks and deleting plugins I managed to get the overall latency low enough to play stuff in and for things to be more responsive.
100% would recommend if you have large projects and do sound design and often deactivate plugins instead of deleting them!