regen

This plugin compresses javascript files and CSS files loaded by the theme or other plugins automatically. 
Extra spaces, lines, and comments will be deleted. 
The compressor is based on <a href="http://code.google.com/p/jscsscomp/" rel="nofollow ugc">jscsscomp</a>.
<h4>Features</h4>
<ul>
<li>Auto-compression for the blog header.</li>
<li>Template tags which provide javascript compression.</li>
<li>You can turn on/off compressions in the admin page.</li>
<li>Editable CSS compression condition.</li>
<li>You can select where to output scripts.</li>
<li>You can exclude scripts from the compression if necessary.</li>
</ul>

Script Compressor

This plugin compresses javascript files and css files.

peterpfeiffer

This plugin requires PHP 7+, so if you are using an old PHP version it will not work
Minify and Optimize your Javascript by clicking one button. All you have to do is go to Settings and click Javascript Minify. Activating the plugin there will minify and optimize your Javascript. No settings required, just click one button.
So anything you can do to speed up the load time of your site should be worth investigating, right? One such thing is “minifying” the Javascript files that are used in part to build your site. As is typically the case, there is a plugin available that can do the job for you – Suprise: It’s this one! Code from this plugin is forked from aph merge scripts a really great plugin. You can find it by searching for it here on wordpress.org in the plugin search. Also full copyright to JShrink and YUIcompressor, which is used in this plugin.
If you want to have a chat or need support please contact me here:
peterpfeiffers88@gmail.com
<ol>
<li>Upload the zip file and unzip it in the /wp-content/plugins/ directory.</li>
<li>Activate the plugin through the Plugins menu in WordPress</li>
<li>Go to Settings and then click Javascript Minify and enable the options you want.</li>
</ol>

Minify Javascript

Minify and Optimize your Javascript by clicking one button and place it in the footer or header.

Script Compressor vs Minify Javascript