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Use Brotli Use http2 Use webp and a CDN that can dynamically resize and serve the most efficient formats Code split your app Utilize edge networks Don’t preload videos, don’t autoplay videos until intersection observer is activated. Use CSS and JS optimization Tweak webpack chunking to reduce cache misses when redeploying Trim the tag manager, move really static code into your own
D’après
https://medium.com/javascript-in-plain-english/improving-javascript-runtime-and-load-performance-5062dded907a