I reduced Server Push to these rules for my HTML pages: * Push only when I can guarantee that they don't have it in cache * Push only assets included in the <

I reduced Server Push to these rules for my HTML pages: * Push only when I can guarantee that they don't have it in cache * Push only assets included in the <head> Which, for me, means I push a single CSS file for a page when I know that the visitor is a new visitor. After that, I never push again. The implementation is essentially: * For a HTML page request * Check for the existence of a pushed=true cookie * If cookie does not exist (new user/session) push the CSS needed * And add a Set-Cookie for pushed=true with the same cache expiry time as the CSS resource That's it. Of course... if we could move away from sending the CSS for a whole site when people just request a page then I'd revisit this, but until then a single CSS file needs a single cookie and a single push.