Even if you don’t actually use many of these yourself, you should understand how each of these suggestions work.

It includes mostly developer-centric suggestions, like CSS optimizations and caching methodologies, but also includes some of the more design- and UX-related strategies for making sites appear faster:

When designing your website or web app, keep in mind that users come to your site with a purpose. The faster (and easier) they can accomplish what they came to do, the better. If users encounter a lot of difficulty in getting to your content, they will leave your site for one that lets them accomplish their goals faster.