Asset CleanUp

Load only the CSS style sheets and JavaScript files needed on your pages and posts, and trim the page size and thus load times accordingly. A site like this, with 25+ active plugins, including 5 different form plugins, is only fast if it’s possible load specific code on specific pages.

Extract from WordPress.org

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 … “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.

https://wordpress.org/plugins/wp-asset-clean-up/