This is interesting and works a lot like the wikia tool, ParserSpeed. Maybe it can either use the description from there, or add more things based on its usefulness.
Topic on Extension talk:PerformanceInspector/Flow
Thanks. I looked through the source code but didn't find anything salvageable. It mainly displays the stats from the Parser, which we report already.
Meanwhile, the extension was removed by Wikia per https://github.com/Wikia/app/pull/12542.