This plugin integrates with and extends Autoptimize. It integrates with criticalcss.com, a premium service which uses a “headless” browser to extract real critical CSS. That way it fully automates the extraction of high-quality critical CSS and the creation of rules for that critical CSS. It can work 100% automated, but also allows semi-automated jobs (where you enter a URL for which you want a specific rule, the power-up will do the rest) and manual rules (where you create the rule and add critical CSS yourself).
But time flies and it’s time for a new evolution; automated creation of critical CSS, using a deep integration with https://criticalcss.com using their powerful API! A first version of the plugin is ready and the admin-page looks like this (look to the right of this paragraph);
release as separate plugin on wordpress.org (shooting for April)
release as part of Autoptimize 2.5 (target mid 2018)
This new “criticalcss.com” power-up has been tested on a couple of sites already (including this little blog of mine) and we are now looking for a small group of to help beta-test for that first target. Beta-testers will be able to use criticalcss.com for free during the test (i.e. for one month). If you’re interested; head on up to the contact form and tell me what kind or site you would test this on (main plugins + theme; I’m very interesting in advanced plugins like WooCommerce, BuddyPress and some of the major themes such as Avada, Divi, Astra, GeneratePress, … ) and I’ll get back to you with further instructions.
So I integrated a page cache (based on KeyCDN Cache Enabler) in Autoptimize, just to see how easy (or difficult) it would be. Turns out it was pretty easy, mostly because Cache Enabler (based on Cachify, which was very popular in Germany until the developer abandoned Cachify) is well-written, simple and efficient. :-)
No plans to release this though. Or do you think I should?