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I would suggest using HTTP/2 whenever possible. Features like connection multiplexing and pipelining alone are huge benefits.

Research by Homaan Behesti of Fastly (above at https://news.ycombinator.com/item?id=16365413#16365605) suggest that you test h2 with your site and see how h2 compares to h1.

According to [0] you can gain performance improvements pretty much in every scenario.

This is specific to H2 Push

Yes, I read a few articles like this and it doesn't seem clear when you should use HTTP2 push.