Title: Jetboost
Last modified: April 4, 2024

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# Jetboost

 *  Resolved [ebrechtb11](https://wordpress.org/support/users/ebrechtb11/)
 * (@ebrechtb11)
 * [2 years, 2 months ago](https://wordpress.org/support/topic/jetboost/)
 * Having issues with Jetboost. I installed WP-Optimizer and then Jetboost don’t
   regenerate critical CSS. Error: Cannot read properties of undefined (reading ‘
   generateCriticalCSS’), Should I not use Jetboost if I have use WP-Optimizer?

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Support [Alin (a11n)](https://wordpress.org/support/users/alinclamba/)
 * (@alinclamba)
 * [2 years, 1 month ago](https://wordpress.org/support/topic/jetboost/#post-17643226)
 * Hi [@ebrechtb11](https://wordpress.org/support/users/ebrechtb11/),
 * I’m not entirely up to speed with the plugin you’re referring to—there’s quite
   a few out there, after all. But here’s the scoop: if Jetpack Boost and WP Optimizer
   are covering the same bases, you might be just fine picking one to keep things
   streamlined.
 * For a deeper dive, toss us the link to your WP Optimizer plugin. There’s a bunch
   that share a name, and we want to make sure we’re looking at the right one to
   give you the best advice.
 *  Plugin Support [Stef (a11n)](https://wordpress.org/support/users/erania-pinnera/)
 * (@erania-pinnera)
 * [2 years, 1 month ago](https://wordpress.org/support/topic/jetboost/#post-17698153)
 * Hi [@ebrechtb11](https://wordpress.org/support/users/ebrechtb11/),
 * I’m going to mark this thread as solved. If you have any further questions or
   need more help, you’re welcome to open another thread here. Cheers!
 *  Plugin Support [Alin (a11n)](https://wordpress.org/support/users/alinclamba/)
 * (@alinclamba)
 * [2 years, 1 month ago](https://wordpress.org/support/topic/jetboost/#post-17723404)
 * Hi [@ebrechtb11](https://wordpress.org/support/users/ebrechtb11/),
 * I’m excited to share some fantastic news with you! 😊
 * After a thorough investigation, we identified that the issue causing Jetpack 
   Boost to fail during Critical CSS generation was linked to the ShopEngine plugin
   active on your site. We [contacted the plugin’s developers](https://wordpress.org/support/topic/plugin-breaking-global-scope-for-some-plugins/#post-17723073),
   and they’ve already released an updated version with a fix.
 * Please go ahead and update the ShopEngine plugin. Once updated, try regenerating
   the Critical CSS in Jetpack → Boost.
 * Best!

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Jetboost’ is closed to new replies.

 * ![](https://ps.w.org/jetpack-boost/assets/icon.svg?rev=2818794)
 * [Jetpack Boost - Website Speed, Performance and Critical CSS](https://wordpress.org/plugins/jetpack-boost/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/jetpack-boost/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/jetpack-boost/)
 * [Active Topics](https://wordpress.org/support/plugin/jetpack-boost/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/jetpack-boost/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/jetpack-boost/reviews/)

 * 3 replies
 * 3 participants
 * Last reply from: [Alin (a11n)](https://wordpress.org/support/users/alinclamba/)
 * Last activity: [2 years, 1 month ago](https://wordpress.org/support/topic/jetboost/#post-17723404)
 * Status: resolved