ImageEngine can kick things up a notch. ImageEngine uses WURFL device detection and globally positioned device-aware servers to get the exact context an image is accessed from.
Each year Smashing magazine release an article of the best tips to help improve your frontend performance. Here they have over 80 tips on what you can do to improve your frontend performance. There's even a downloadable PDF of checklist you can use on your own projects.
A simple factory is an object that is used to generate an instance of an object for the client. The simplest way of understanding a factory is a object for creating other objects.
PHP 7.4 comes with a few new features that can help improve performance and make for cleaner code. Here's some of the new features that come with PHP 7.4.
Tell composer which version of PHP you want it to download packages for, making sure that all your install packages will be valid for production.