"The cost of JavaScript in 2019" by Addy Osmani https://v8.dev/blog/cost-of-javascript-2019
"In 2019, the dominant costs of processing scripts [in Chrome] are now download and CPU execution time."
This is a good post, although I find it a bit odd that changes to V8/Chrome are discussed as if they represent the entire web, and Chrome is the only browser you should care about.