limelightdept

Optimize page load times with full page caching. Improves Google PageSpeed Insights by an average of +30%.
Cache Ultra recompiles your javascript and css, then “snapshots” your pages into fully cached static html files. Automatically renews your snapshots every 8 hours to handle WordPress form tokens and such.
Also provides lazy loading site-wide or page-by-page. 
You’ll have full control of page resources and how they’re loaded on a per page or post type basis.
Create custom cache to handle the unique scripting needs for your site.
This plugin leverages our powerful caching API.
For more information visit http://www.limelighttheme.com

Cache Ultra

Optimize page load times with full page caching. Improves Google PageSpeed Insights by an average of +30%.

peterpfeiffer

Minify and Optimize your CSS by clicking one button. All you have to do is go to Settings and click CSS Minify. Activating the plugin there will minify and optimize your CSS. 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 CSS 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 Autoptimize a really great plugin. You can find it by searching for it here on wordpress.org in the plugin search.
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Upload the zip file and unzip it in the /wp-content/plugins/ directory.
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Activate the plugin through the Plugins menu in WordPress
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Go to Settings and then click CSS Minify and enable the options you want.
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CSS Minify

Way to go, peterpfeiffer! Your plugin contains the same files and functions as in Autoptimize and your plugin's PRO version provides what people could get for free in Autoptimize. Who knew "Copy, cut and paste" could be a business model?!

Autoptimize, but with most features moved to PRO

Minify and Optimize your CSS by clicking one button.

Cache Ultra vs CSS Minify