[forcefsck]

Furthermore 1,2 and 3 seem to make an impact only in establishing the initial connection, which is not that much time, even 40% latency decrease would be less than half a second gain in most situations, and if I got it right, the article states in point 3 that only 33% of http traffic is preceded with a new connection establishment.

[Flenser]

I'm guessing googlebot creates a lot of initial connections and if this was implemented widely it would speed up crawling.