The "SSR is for performance" folks need to be posting traces from mid/low-end devices/networks to demonstrate that their experiences get consistently interactive fast enough to make the magic trick actually work.
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This is really not good. For context, this is a SSR'd "universal" React app, with CDN HTML caching. I've been asking the React community for solutions to this problem for awhile (the very expensive hydration), because it's not just us—but still a mystery:https://twitter.com/OliverJAsh/status/1042726866770161665 …
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You can get a feeling for how this would be experienced on device by clicking into the "Filmstrip View", which lets you correlate the screen updates and main-thread time with network activity: https://www.webpagetest.org/video/compare.php?tests=190620_RY_574cc1b8b8a62fca29ab24629e769129-r%3A1-c%3A0&thumbSize=200&ival=100&end=full …
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Does WPT give you this as a metric anywhere? If not, should First Interactive (beta) be used instead? This has always confused me.
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