Title: Spiking CPU Usage
Last modified: April 18, 2018

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# Spiking CPU Usage

 *  [goofychas](https://wordpress.org/support/users/goofychas/)
 * (@goofychas)
 * [8 years, 1 month ago](https://wordpress.org/support/topic/spiking-cpu-usage/)
 * To Whom This May Concern,
 * After yesterday’s update over night my CPU usage spiked and ran me into warnings
   with my SiteGround webhost. They said my heartbeat was going crazy and that I
   needed to stop it. I have Heartbeat deactivated in Swift Performance but something
   wasn’t working. I ended up restoring my site before the update and the CPU usage
   is going back to normal. Please let me know what I should do.
 * Thank you for your time and help.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fspiking-cpu-usage%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Author [swte](https://wordpress.org/support/users/swte/)
 * (@swte)
 * [8 years, 1 month ago](https://wordpress.org/support/topic/spiking-cpu-usage/#post-10200505)
 * Hi,
 * While the plugin is generating the cache the CPU usage can be higher than usual.
   If CPU usage is constantly higher you may need check the configurations. It is
   recommended to enable Settings > Optimization > General > Optimize Prebuild Only.
 * Generating Critical CSS is the most CPU intensive process. If your site is running
   on shared hosting you may consider to disable Critical CSS feature, or upgrade
   to pro version, which provides Compute API (it will generate the critical CSS
   in cloud).

Viewing 1 replies (of 1 total)

The topic ‘Spiking CPU Usage’ is closed to new replies.

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 * 1 reply
 * 2 participants
 * Last reply from: [swte](https://wordpress.org/support/users/swte/)
 * Last activity: [8 years, 1 month ago](https://wordpress.org/support/topic/spiking-cpu-usage/#post-10200505)
 * Status: not resolved