digitalapps

This plugins detects all of the styles queued via wp_enqueue_style. Contents of each css file are copied and stored in a single css file. This file is loaded on the frontend. The plugin wp_dequeue_style and wp_deregister_style all other css files. The result is your website only makes one single http request to load css styling. Bonus feature the contents of the css file are minified.
Simply flip the switch and the plugin will do the rest.
NOTE: I have only tested this plugin on my own sites running the AdSense Theme. If you encounter a problem with this plugin please let me know. I will be able to help you.

WP CSS Merge

This plugins detects all of the styles queued via wp_enqueue_style. Contents of each css file are copied and stored in a single css file.

Dipak C. Gajjar

WP Super Minify automatically minifies, compresses, and caches HTML, CSS & JavaScript files (inline and individual) on demand to enhance website’s load speed.
Once activated, the plugin seamlessly compresses HTML, inline CSS, and JavaScript, reducing file sizes for faster page loading. This optimisation helps improve your site’s Google PageSpeed Insights and GTmetrix performance scores.
Additionally, WP Super Minify minifies individual JavaScript and CSS files, ensuring they load correctly and are automatically updated whenever the original files are modified or added — no manual settings needed!
Optimise your website effortlessly and deliver a faster, smoother experience to your visitors.
To check whether this plugin works properly, simply view your site source or press Ctrl + U from your keyboard. In the end of the source, you should see message something like:
*** Total size saved: 11.341% | Size before compression: 27104 bytes | Size after compression: 24030 bytes. ***
Like this plugin? You’ll love my other plugin: <a href="https://wordpress.org/plugins/wp-performance-score-booster/" rel="ugc">WP Performance Score Booster</a>
<h4>Development & Support</h4>
Follow the development of this plugin on <a href="https://github.com/dipakcg/wp-super-minify" rel="nofollow ugc">GitHub</a>.
P.S. It is always the best policy to open a <a href="https://wordpress.org/support/plugin/wp-super-minify" rel="ugc">support thread</a> first before posting any negative review.
<h4>Credits</h4>
A big shoutout to <a href="https://github.com/mrclay/minify" rel="nofollow ugc">Steve Clay</a> and <a href="https://github.com/matthiasmullie/minify" rel="nofollow ugc">Matthias Mullie</a> for sharing their Minify libraries on GitHub. While these libraries are no longer actively maintained, their work has been invaluable, and I sincerely thank them.

WP Super Minify • Minify, Compress and Cache HTML, CSS & JavaScript

A lightweight plugin that automatically minifies, compresses, and caches HTML, CSS, and JavaScript on demand to improve your website’s load speed.

WP CSS Merge vs WP Super Minify • Minify, Compress and Cache HTML, CSS & JavaScript