Many admin-ajax.php requests

If admin-ajax.php traffic jumps suddenly, use the browser Network panel to see which action is firing.

1. Log in and open the page where the issue happens.
2. Open developer tools and go to the Network tab.
3. Filter to XHR (or Fetch/XHR).
4. Trigger the page behavior again.
5. Click an admin-ajax.php request and inspect the request parameters.
6. Note the action value in the form data.

A common value is heartbeat, which is built into WordPress. Other action names often point to a specific plugin. Search that action name in the plugin codebase or docs, or send it to support with Site Health info.