Query Monitor is the developer tools panel for WordPress. It enables debugging of database queries, PHP errors, hooks and actions, and more.
Why it is recommended?
This is an essential tool that will help you monitor the state of your WordPress.
Query Monitor tracks loading times of each WordPress hook and database calls, which allows for better tracking of bottlenecks and where the code needs optimization.
This plugin will highlight and detect slow database SQL queries that need the developer’s attention. And will report any PHP error and warning.
The plugin will generate an overhead due to the fact that is checking everything during runtime, be aware of this when planning to install and activate “Query Monitor” in a live environment.