That’s many requests on the backend with just one user. Now imagine a site where there are multiple editors logged in concurrently. Such a site can rack up Ajax requests rapidly, generating high CPU usage. Sometimes, the Post and Response data presented in speed test reports may not be as clear and straightforward.
- Users have been reporting that once the update was installed, CPU usage increased dramatically even when the system was idle.
- The high usage reportedly comes from Cortana, specifically the SearchUI.exe process that can be found inside Task Manager.
- Any and all advise or info will be greatly appreciated.
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The higher the frequency, the bigger the savings on server resources used. You can fix this issue easily by using the Heartbeat Control plugin by WP Rocket. It allows you to disable or modify the frequency of the Heartbeat API in just a few clicks. WordPress has fixed this Heartbeat API issue partially long ago. For instance, you can reduce the frequency of requests generated by the Heartbeat API on hosts with limited resources. It also suspends itself after one hour of keyboard/mouse/touch inactivity. Kinsta actually came across this very issue while helping DARTDrones scale their WooCommerce site for an appearance on Shark Tank.
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Thankfully, if you cannot resolve an issue with the plugin, you most like have many alternative plugins available to try out. For example, when it comes to page builders you could also try out Beaver Builder or Elementor. Testing another slow website in GTmetrix led to finding similar issues with Visual Composer page builder and Notification Bar plugins. You can also use GTmetrix to dig into individual post and response data. You can use this feature to pinpoint what’s causing the issue. As you can see in the WebPageTest report above, admin-ajax.php loads towards the end of the requests queue, but it still takes up 780 ms. That’s a lot of time for just one request.
This cookie has not personal data it just indicates if you have signed up. If you’re still struggling with high admin-ajax.php usage on your WordPress site, let us know in the comments section. WordPress uses Ajax in its Heartbeat API to implement many of its core fix AOL dlls features. However, it can lead to increased load times if not used correctly. This is typically caused due to a high frequency of requests to the admin-ajax.php file. Overwhelming your site with a DDoS attack or spam bots can also lead to high admin-ajax.php usage. However, such an attack doesn’t necessarily target increasing Admin Ajax requests.
Here, finding the origin of high admin-ajax.php usage isn’t as easy. In such cases, you can always do it the old school way.
If your server has limited CPU resources, I recommend you to Disable Heartbeat on both WordPress Dashboard and Frontend. You can also Modify Heartbeat frequency for the ‘Post editor’ option and increase it to 30 seconds .
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Usually, Admin Ajax loads towards the end of the page load. Also, you can set Ajax requests to load asynchronously, so it can have little to no effect on the page’s perceived performance for the user. You will receive the next issue of the Kinsta Newsletter within a week. But plugins aren’t the only culprit here as themes, the WordPress core, the webserver, and a DDoS attack can also be the reason behind high Admin Ajax usage. The admin-ajax.php file contains all the code for routing Ajax requests on WordPress.