Re:MDN (beta) is now built with React
by anchpop on Tuesday July 16, 2019 @04:22PM
(#20453519)
The server doesn't do any rendering before serving the page. All the "SSR" is done exactly once at build time. To the server it's no different from serving any other site.
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I'm not too familiar with Gatsby but something has to be slowing you down if TTFB is too high.