The purpose of Ajax
How does it work with Wordpress?
The negative side of Ajax
If Ajax is set up correctly, Ajax does not have a bad side at all, but unfortunately it sometimes happens that developers do not implement this Ajax technique correctly in their plugin. In such cases this can have a big impact on the performance of your site. Developer Tools (F12), webpagetest.org or in the access logs several admin-ajax.php requests will appear, loading your site for 80% per request.
Regularly we see sites that have 10 admin-ajax.php requests per user several times per second, so 10 visitors are responsible for a large load on your server.
It is therefore often wise to limit these calls. To determine if your site will work faster you could use a staging environment. This makes a copy of your current site and allows you to test different settings. It is therefore possible to turn plugins on and off to see which of the plugins will eventually execute these calls. Because you are not in the process of modifying your live site a staging environment is a good solution for this. You can create a staging for all our packages using the admin panel you find at admin.savvii.com.