jimbo2150

This plugin extends the WP_Scripts class, adding some additional methods and filters that overload the existing script output to add Require.js syntax. It loads scripts via Require.js and by default defers until the DOMContentLoaded event fires (unless a manually added require() is called within the head/body and does not wait for the DOM to be loaded. 
It is designed to work in conjunction with HTTP/2 but will function fine without it (though you may see slower load times).
This plugin is design to assist developers in updating and creating JavaScript that is asynchronous – that is, scripts that can load in a different order and do not assume that their dependencies are available immediately. Use of the Asynchronous Module Definition (AMD) allows a script to define it’s dependencies and have them loaded asynchronously prior to the entire script or the initialization portion executes.
It is common for larger projects to concatenate together scripts however, they can end up a jumbled mess and smaller required functions are often duplicated (and redundant) across multiple scripts. HTTP/2 corrects this by allowing multiple resource files to be requested and downloaded within a single TCP window. As projects get larger and more diverse it is becoming more economical to load the individual components (modules) that are needed rather than download and execute one massive concatenated script file (which can also cause the browser to freeze up).
NOTE: This plugin currently only replaces non-administrative (front-end) scripts with Require.js syntax.
Plugin website: https://techie-jim.net/wordpress-plugins/requirewp/

RequireWP

Uses Require.js to load scripts faster and speed up WordPress / increase site load speed & performance. Designed to work with HTTP/2.

Sean Michaud

Optimize Scripts & Styles optimizes your site’s JavaScript and CSS files by combining, minifying and caching them. This will help your site’s overall performance and user experience by reducing the number of files served up and the overall size of these files.
For developers, this allows you to maintain uncompressed versions for development themes or plugins, while compressing them for a production environment.
For you SEO buffs, it cleans up the number of scripts that get included and downloaded to your site visitors, helping your overall PageSpeed score.
Header and footer script locations are maintained as well as any localized data used for the scripts and the minified files are stored in the /cache folder, making it friendly for plugins like WP Super Cache. Media attributes are also maintained for print stylesheets.
<h3>Features</h3>
<ul>
<li>Combine & minify all JavaScript & CSS that is enqueued</li>
<li>Stores the optimized files in the cache folder for faster page loads</li>
<li>Compatible with caching plugins like WP Super Cache and W3 Total Cache</li>
<li>Enable for logged in users (not recommended)</li>
<li>Available options to remove or ignore enqueued scripts and styles</li>
<li>Optional button in the admin bar to clear scripts and styles</li>
<li>Includes an option to remove script type attributes for HTML5 validation</li>
</ul>

Optimize Scripts & Styles

Optimize Scripts & Styles combines scripts and styles on your site, minifies them and provides cachable versions for improved site performance.

RequireWP vs Optimize Scripts & Styles