Helping Browsers Optimize With The CSS Contain Property — Smashing Magazine
The CSS contain property gives you a way to explain your layout to the browser, so performance optimizations can be made. However, it does come with some side effects in terms of your layout.
Front-End Performance Checklist 2020 [PDF, Apple Pages, MS Word] — Smashing Magazine
Let’s make 2021... fast! An annual front-end performance checklist, with everything you need to know to create fast experiences on the web today, from metrics to tooling and CSS/JavaScript techniques.
javascript - How to detect slow internet connections? - Stack Overflow
Currently, most of the popular websites, like google, yahoo detect if the user connection speed is slow and then give a option to load basic version of the website instead of the high end one.
Wha...