Plugin uses admin-ajax.php, causing slow loads

Pingdom was reporting that admin-ajax.php was adding a couple of seconds load time to my site. Since this php file should only be used in the admin panel, I was confused that it was slowing the page load time for an anonymous user.

I searched which plugins were using admin-ajax, and Slimstat was one of them.

As soon as I disabled Slimstat, load times improved and admin-ajax was no longer slowing my site down.

Can someone please confirm whether this is a known issue?

Thanks in advance.

Neil

https://www.ads-software.com/plugins/wp-slimstat/