I believe it's the percentage of the total city population that are both 25-34 and have a degree. Not the percentage of 25-34 year-olds with a degree.
- var optionsGlassPane = new WebInspector.GlassPane(document);
An important part of viewing diffs for me is seeing what the old code was. jsblocks: 700ms
React: 950ms (35% slower)
Angular: 2200ms (310% slower)
Doing some maths: 700ms + (700ms * 0.35) = 945ms
700ms + (700ms * 3.10) = 2870ms
Looks like they got a little carried away when calculating Angular's rendering speed. Same thing with the "Syncing Changes" stats.