Web performance This is an underappreciated field that lends to plenty of consulting. As the web becomes more complex, with heavy frontend code, third party services, and demanding amounts of images and videos, it's requiring a deeper understanding about networking and browsers to keep the web performant. Compounding the problem is the growing number of users who use mobile devices to browse the web, which have large…
Anyway, if someone's interested, you can start by reading articles from:
https://developer.mozilla.org/en-US/docs/Learn/Performance
https://calendar.perfplanet.com/
https://phabricator.wikimedia.org/phame/blog/view/7/
And some of my own content:
https://calendar.perfplanet.com/2018/getting-started-with-we...