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The following article is a list of WordPress Plugins using admin-ajax.php in a manner that results in performance issues with your WordPress site.
Why does using admin-ajax.php cause performance issues? The following two articles go in-depth into why admin-ajax.php should be avoided completely when developing a plugin, especially for any front-end non-logged-in requests.
- WP REST API vs admin-ajax.php vs Must-Use Plugin: Handling AJAX Requests in WordPress – Delicious Brains
- Don’t Use Admin-Ajax – blog.julien-maury.dev