To increase better user experience, we always end up with increasing site speed. After clicking a website link seems like a simple thing. But have you ever thought, how many requests are instantly pinged within few seconds after a single click? There are lots of things happens within this few seconds that may slow down the website Admin-Ajax it’s the one explained here.

How To Reduce Admin-Ajax Server Load In WordPress
How To Reduce Admin-Ajax Server Load In WordPress


Although, there are various things behind slow loading of the site. If checking on site speed test tools, sometimes it shows a warning in admin Ajax.php file. That means Admin Ajax.php file is also one of the reasons behind slow loading of the site.

Admin-ajax.php is part of the WordPress AJAX API. It does handle requests from both backend and front end as well. Ajax allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes.

In WordPress 3.6, WordPress introduced Heartbeat API. The API stimulate bidirectional connection between the browser and the server. In addition, it was used for autosave, post locking, and log-in expiration warning while a user is writing or editing.

Heartbeat API triggers events on receiving data/response while creating requests for communication with the server. This generally causes a huge load on the server and thus slow down the website.

Due to this Heartbeat API, Admin-ajax.php generates requests after every 15 seconds. The request can be any communication with the server. And thus by sending too many requests, the server takes a long time to display your contents or load the website.

How To Reduce Admin-Ajax Server Load?

Speed up WordPress Admin Dashboard

How To Reduce Admin-Ajax Server Load In WordPress - Speed
How To Reduce Admin-Ajax Server Load In WordPress – Speed


So, the best solution to speed up the site at backend is by disabling the Heartbeat API. Instead, install the Heartbeat control plugin. Heartbeat control plugin allows you to easily manage the frequency of the WordPress heartbeat API. Through this plugin, the heartbeat API can be disabled entirely.

Note: If you are using any caching plugin, then disable the object cache before moving forward. It will drastically speed up the WordPress dashboard.

To Install Heartbeat Control plugin:

To Install Heartbeat Control WordPress plugin
How To Install Heartbeat Control WordPress Plugin


  1. Login to your WordPress Admin Dashboard.
  2. Go to Plugins>> Add new and search for Heartbeat Control.
  3. Now, Install and Activate it.

The configuration of HeartBeat Control Plugin:

How to Limit Heartbeat API in WordPress
How to Limit Heartbeat API in WordPress


  1. Go to settings and then Control HeartBeat (Settings>> Control Heartbeat)
  2. Now, select locations. The locations have three options to choose.
    • Disable Everywhere
    • Disable on Dashboard Page
    • Allow Only on Post Edit Page
  3. If I guess, your site regularly contributes more than 1 user. So, I suggest selecting Allow Only on Post Edit Page location to disable the plugin.
  4. Now, you need to select the time interval for executing admin-ajax requests by going through Override Heartbeat Frequency menu.
  5. Set the time interval of 60 seconds. By doing this, the requests will generate after every 60 seconds. This drastically reduces the load on the server.
  6. Now, search for the plugin that uses Heartbeat API.
    • To do so, Go to GTMetrix site and analyze your website. Now, go to Waterfall tab and analyze which file is taking long time to connect and response.
    • Now, scroll down and see if there is any entry for POST admin-ajax.php.
    • If yes, expand it and navigate to the Post tab to find the plugin.
  7. Now you are all set.

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