The Speed page on CloudFlare allows you manage asset minification and compression.
Go to the Speed tab to get started
Brotli is an open source compression format created by Google. Instead of using the standard gzip compression that is enabled by default on nginx, you can switch it out for Brotli - which is a more optimised compression format - to increase general website performance. If the client does not support Brotli compression, CloudFlare will recognise this and use gzip for that request instead.
You can visit the GitHub repository here.
Usage of rocket loading heavily depends on your use-case since it can potentially break React as well as other third party libraries.