Title: CriticalCSS
Last modified: April 9, 2020

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# CriticalCSS

 *  Resolved [WPAndrew](https://wordpress.org/support/users/wpandrew/)
 * (@wpandrew)
 * [6 years ago](https://wordpress.org/support/topic/criticalcss-2/)
 * I installed the CriticalCSS plugin from the Autoptimize tab and now when I click
   on the CriticalCSS tab it says
 * “Ooops. Please activate the “Inline and Defer CSS” option on Autoptimize’s main
   settings page to use this power-up.”
 * The settings page defaults to the JS, CSS & HTML tab, with no mention of CriticalCSS
   on it on the latest version of Autoptimize. Is this feature still available, 
   or am I looking in the wrong location to enable it?

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * (@optimizingmatters)
 * [6 years ago](https://wordpress.org/support/topic/criticalcss-2/#post-12652857)
 * “inline & defer” is an option on Autoptimize’s default tab, under “CSS options”
   wpandrew 🙂
 * hope this helps,
    frank
 *  Thread Starter [WPAndrew](https://wordpress.org/support/users/wpandrew/)
 * (@wpandrew)
 * [6 years ago](https://wordpress.org/support/topic/criticalcss-2/#post-12652905)
 * Ok, thanks. I’ll give it a try!
 *  Thread Starter [WPAndrew](https://wordpress.org/support/users/wpandrew/)
 * (@wpandrew)
 * [6 years ago](https://wordpress.org/support/topic/criticalcss-2/#post-12652920)
 * Also, are there any best practices with regards as to which features to use/not
   use on Autoptimize with a site using Cloudflare? I am not technically savvy enough
   to understand which optimization conflicts might inadvertently hinder performance,
   but I have read that using Autoptimize can be helpful when used with Cloudflare..
 *  Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * (@optimizingmatters)
 * [6 years ago](https://wordpress.org/support/topic/criticalcss-2/#post-12652993)
 * in general they work well together. rocket loader can be a bit tricky, best is
   to configure Autoptimize fully and only then try rocket loader to see if it helps
   improve perf. more.

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘CriticalCSS’ is closed to new replies.

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## Tags

 * [criticalcss](https://wordpress.org/support/topic-tag/criticalcss/)

 * 4 replies
 * 2 participants
 * Last reply from: [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * Last activity: [6 years ago](https://wordpress.org/support/topic/criticalcss-2/#post-12652993)
 * Status: resolved