shortpixel-critical-css

I don’t know of any similar plugin with this functionality. Their service actually analyzes CSS and JS files for which parts can be loaded upfront to make the website show up faster. Only later the full CSS/JS seem to load. For JS files I see that they generate a custom version. Options can be a bit confusing but their customer support is outstanding!

I keep trying to generate Critical CSS with it but it adds nothing to the queue. I tried it about 5 minutes and uninstalled it. I now understand that pages need to be first visited and I have seen it had some pages in pending. However it seems to return a critical error when I clear cache with WP-Rocket and I can’t troubleshoot the issue and I have deleted the plugin. Although not ideal, I’ll leave 5 stars because I can’t delete this review and I don’t want to negatively impact your rating because of my mistake of not creating a support thread instead.

Easy to use and simple. Does what it says.