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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.
Google On Why Google Search Console LCP Is Not Wrong
Caching should be a "cherry on top" to boost speed, rather than the only reason you have a fast site.
View Transitions Break Incremental Rendering
Instead of showing users that this thing is the same as that thing, we’ve told them, perhaps with extra motion/panache, that even though these the…
Web font file size study: a variable font addition
The sum is smaller than the parts. A variable font that has both normal and heavy (bold) weight (and also everything in between) is slightly smaller…
I wasted a day on CSS selector performance to make a website load 2ms faster
It was at this point that the second penny dropped and I realised I’d been duped by a graphing misunderstanding and my own enthusiasm for improving…
kliksphilip
JPEG VS AVIF - The Battle of Compression
In this super thorough study I test one single HD image and come to vast sweeping conclusions about JPEG XL and AVIF. But that's still one image comparison…
Alex Russell 
Eric Portis
Stoyan Stefanov
Trys Mudford