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/ …
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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All good points! In terms of crystal ball big shifts in web perf - SW.js, Lighthouse CI, removing polyfills, updating carousels etc. all require effort for _every_ site to improve. I wonder what % of sites changed 0 LOC in 2019.
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Developer inertia is a big challenge with web performance, not because of lack of drive or knowledge. Companies constantly prioritise features over speed. An advantage shared by JAMstack, WASM (& workers), Edge & Web Monetisation is that they're new & shiny. Maybe = investment.
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