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JavaScript is the most expensive resource in terms of performance on the web, and is a really common bottleneck when used too much.
Where you can implement something in HTML or CSS then do, and make sure your pages can start rendering without JavaScript.
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…
Introducing Speed Brain: helping web pages load 45% faster
With the initial release of Speed Brain, we have designed a solution with important side effect prevention guardrails that completely removes the…
Alistair Shepherd 
Eric Portis
Stoyan Stefanov
Trys Mudford