Now that you have the Heartbeat Control plugin installed, you will need to configure its settings.
Step 1: To access the settings page, hover over Tools on the left side menu bar and click on Heartbeat Control.
Step 2: Once on the settings page, you will notice 2 different dropdown boxes.
Step 3: The first box will allow you to disable the WordPress heartbeat on the entire site or on specific locations. Depending on your needs, you may disable the WordPress heartbeat completely, or only allow it on specific locations such as on the post edit page.
Step 4: The second box allows you to determine how often the WordPress heartbeat API will make a request. For example, on post edit pages it makes a POST request every 15 seconds. This can be modified within the heartbeat frequency dropdown to delay it up to 60 seconds between requests which would cut down server resources caused by admin-ajax requests by 75%.
Step 5: Once your changes are made, click on Save Changes