Redpic JS&CSS Optimizer combine CSS and JS files from theme and installed plugins using optimal algorithm to speedup rendering and page load. This will increase page metrics on Google Page Speed. Combining of files will not break scripts.
Unzip the downloaded plugin and upload the folder “redpic-js-css-optimizer” to the “/wp-content/plugins/” directory.
Go to the plugin menu in WordPress and activate the plugin.
Go to the “Redpic JS&CSS Optimizer” settings page.
I love its simplicity and it really attempts to do a good job when it comes to combining all the files. However it's not compatible with the Avada theme: Caching results in always showing the mobile CSS, I think because it's combining the CSS in the wrong order, maybe. Another issue is it does not minify the JS and CSS. It also would also be good to have a "clear cache" button on the admin bar.
This plugin is super simple. This is exactly what a plugin for combining JS and CSS should be. Just switch it on and that's it.
Also, I clicked on "clear cache" and the JS filename was not regenerated. It is a good news.
I used mmr and autoptimize, the problem of those plugins are related to the regeneration of the filename. From time to time, the JS and CSS filenames change. So, in the cache of google, the link to the JS and CSS files get broken. It means that for a while, Googlebot looks for the old JS and CSS filenames without finding it.
I have the feeling that the redpic plugin uses the querystring: ?ver=1.1 It should be the right approach to mnotify googlebot that something has changed in the file.
So rather than changing the file from Aze34943szkzz.js to dojggdd2934483.js it is better to go from Aze34943szkzz.js?ver=1.1 to Aze34943szkzz.js?ver=1.2