by Gabe Livan on WordPress.org
Make your website load FASTER by stopping specific styles (.CSS) & scripts (.JS) from loading. It works best with a page caching plugin / service.

When editing a page, a meta box will load with the list of loaded CSS & JS files from the active theme & plugins
Don’t just minify & combine CSS/JavaScript files ending up with large, bloated and slow loading pages: Strip the “fat” first and get a faster website 🙂
Faster page load = Happier Visitors = More Conversions = More Revenue
There are often times when you are using a theme and a number of plugins which are enabled and run on the same page. However, you don’t need to use all of them and to improve the speed of your website and make the HTML source code cleaner (convenient for debugging purposes), it’s better to prevent those styles and scripts from loading.
For instance, you might use a plugin that generates contact forms and it loads its assets (.CSS and .JS files) in every page of your website instead of doing it only in the /contact page (if that’s the only place where you need it).
“Asset CleanUp” scans your page and detects all the assets that are loaded. All you have to do when editing a page/post is just to select the CSS/JS that are not necessary to load, this way reducing the bloat.
The plugin works best in combination with a cache plugin (e.g. WP Rocket, WP Fastest Cache, W3 Total Cache), a hosting company that offers packages with server-level caching available (e.g. WP Engine, Kinsta) or a service like Cloudflare that has page caching enabled.
Each option can be turned on/off depending on your needs. Instructions about each of them are given in the plugin’s settings page.
This is an API service used by WordPress for 3rd party applications, such as mobile apps, communication between blogs and plugins such as Jetpack. If you use or are planning to use a remote system to post content to your website, you can keep this feature enabled (which it is by default). Many users do not use this function at all and if you’re one of them, you can disable it.
Plugin works with WordPress Multisite Network enabled!
Asset CleanUp Pro
This plugin is the lite version of Asset CleanUp Pro that comes with more benefits including managing assets (CSS & JS files) on all WordPress pages, unloading plugins site-wide or via Regex(es), apply “async” and “defer” attributes on loaded JavaScript files which would boost the speed score even higher, move the loading location of CSS/JS files (from HEAD to BODY to reduce render-blocking or vice-versa if you need specific files to trigger earlier) and premium support. Click here to purchase Asset CleanUp Pro!
People that have tested the plugin are so far happy with it and I want to keep a good reputation for it. In case something is not working for you or have any suggestions, please write to me on the forum and I will be happy to assist you. BEFORE rating this plugin, please check the following post http://chrislema.com/theres-wrong-way-give-plugin-feedback-wordpress-org/ and then use your common sense when writing the feedback 🙂
Give Asset CleanUp a try! If you want to unlock all features, you can Upgrade to the Pro version.