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Testing performance on actual device should be mandatory for every project, as it makes so many issues obvious.
The best analouge you can buy for a representative P75 device today are ~$200 Androids from the last year or two, such as the Samsung Galaxy A50 and the Nokia G11.
The Minifier Benchmarks Project · Comparing Web Page Minification Results (HTML, CSS, JS)
The Minifier Benchmarks Project is a community-maintained collection of web page minification benchmarks, stewarded by Jens Oliver Meiert (context…
JPEG XL vs AVIF for web use-cases
I'll go into full detail, with examples and benchmarks, but for those of you who don't have the time, here are [2 of] the headlines: For lossy photos…
Standards In Progress: Making Video Posters Accessible, Responsive, and an Element
I'm showing just a sampling of the available markup here of course–you might want to coordinate multiple art-directed video and picture sources for…
I’m always left wondering (suspecting the answer with hopeful optimism that my hunch is wrong this time): do these workflow improvements actually…
JPEG XL isn't useless; it is genuinely compelling technology for use cases beyond the Web. I'm just not personally convinced we need it in browsers…
Alex Russell 
Jens Oliver Meiert
Jake Archibald
Scott Jehl
Zach Leatherman
Gianni Rosato