M dot site load times suffer from the initial redirect, but generally are much smaller in request and KB count. RWD sites are the opposite: no redirect, but heavy on the requests and tonnage. That leads to a question that was discussed at a panel at Velocity Conference: Which is faster: M dot or RWD? Now, there is a feature inside WPT to identify RWD sites in desktop, but it is not yet being recorded in the HTTPArchive. So I had to come up with criteria to categorize sites: CASE WHEN ...