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If you care about client-side latency you should be using HTTP/2. And HTTP/2 is HTTPS-only.

HTTP/2 is not HTTPS-only, the browsers implementations may be.

it's HTTPS-only in all browsers that support it. http://caniuse.com/#feat=http2

Not supported on IE8. Total deal breaker.

IE8 is not supported, along with Windows XP.

so?