I've written some thoughts about what the key #webperf technologies of 2020 could be. Spoiler alert: not 5G or HTTP/3.https://simonhearne.com/2019/2020-predictions/ …
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7.) Feature Policies for control (e.g., via Never-Slow Mode) 8.) Observability & feedback (on your list) 9.) Anaheim (Chromium-based Edge) killing polyfill bloat 10.) CSS features replacing JS libraries (no JS for, e.g., carousels) 11.) Bonus! Sequestering JS to the server-side.
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Others will have impact on fewer (but more heavily used) sites, e.g., better understanding and use of Service Worker code caching optimisations. Some have played out in '19 w/ too little fanfare; notably layout for non-latin text and JS parse speed improvements.
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Good list! In terms of shifting the needle for the most web users, I strongly agree with 6. The rest require some developer effort to implement as an explicit performance improvement (except if 1 becomes default in font foundries).
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`font-display: optional`!
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