CSS Concatenation

CSS files are concatenated in a single file (Not always valid for HTTP/2)

If you are still using HTTP/1, you may need to still concatenate your files, it's less true if your server use HTTP/2 (tests should be made).

• Use online tool or any plugin before or during your build or your deployment to concatenate your files.

• Ensure, of course, that concatenation does not break your project

• HTTP: Optimizing Application Delivery - High Performance Browser Networking (O'Reilly)

• Performance Best Practices in the HTTP/2 Era