Take Glimmer out so I don't have a horse in the race and just look at Preact. Preact is much lighter than Polymer out of the box, and for the experiment our JS bundle size was tiny (much much smaller than e.g. YouTube Gaming). Even in that scenario, SSR had better FMP at 90p.
These are also wholly different to most of what I observe in "SSR" traces on more representative devices and networks. This isn't showing the huge script payload camping out on the main thread seconds after content arrives. In short, it's good work all around.
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It's fundamentally different to previous traces I've seen built with Ember SSR and nearly all React SSR solutions. With your permission, I'd like to post traces of the Ember Fastboot site to illustrate the difference.
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No objections here. Mostly I hope your takeaway is that we're on the same page w.r.t. web performance. It just takes a lot of time to shift the culture in big engineering organizations (as I'm sure you've experienced).
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