Title: Jetpack Boost breaking website
Last modified: June 15, 2026

---

# Jetpack Boost breaking website

 *  [clockworkscio](https://wordpress.org/support/users/clockworkscio/)
 * (@clockworkscio)
 * [3 days, 8 hours ago](https://wordpress.org/support/topic/jetpack-boost-breaking-website/)
 * Hello,
 * My website has started loading with all the formatting stripped (just as HTML)–
   it loads correctly initially and then reverts. I have traced the issue back to
   Jetpack Boost (which had just auto-updated) and when I disabled the plugin the
   website started working again. I’ve seen other recommendations on this forum 
   to disable the customisations and re-enable them one by one, but I’m not able
   to disable any of the customisations – the toggle just won’t move.
 * At the top of the Jetpack Boost page I’m getting the following error:
 * Failed to load Speed Scores
 * HTTP 404 error received while communicating with the server.
 * Failed to load performance history
 * DS request failed: 404{ “name”: “DataSyncError”, “errorData”: { “namespace”: “
   jetpack_boost_ds”, “key”: “performance_history”, “endpoint”: “performance-history”,“
   method”: “GET”, “location”: “[https://theclockworks.org/wp-json/jetpack-boost-ds/performance-history&#8221](https://theclockworks.org/wp-json/jetpack-boost-ds/performance-history&#8221);,“
   status”: “response_not_ok”, “data”: {} } }
 * I’m using the Blocksy theme.
 * Thanks
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fjetpack-boost-breaking-website%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

You must be [logged in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fjetpack-boost-breaking-website%2F%3Foutput_format%3Dmd&locale=en_US)
to reply to this topic.

 * ![](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/)

## Tags

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

 * 0 replies
 * 1 participant
 * Last reply from: [clockworkscio](https://wordpress.org/support/users/clockworkscio/)
 * Last activity: [3 days, 8 hours ago](https://wordpress.org/support/topic/jetpack-boost-breaking-website/)
 * Status: not resolved