Why the code into functions.php is called many times?

Hi,

I’m using this code into the file functions.php o a custom theme to create an object LabManager that defines all the custom taxonomies and the custom post types of this site.

if ( ! class_exists( 'LabManager' ) ) {
	include_once 'classes/class-labmanager.php';

	global $lab_manager;
	$lab_manager = new LabManager();
	$lab_manager->plugin_setup();
}

Setting a breakpoint on the row “$lab_manager = new LabManager();” I can see that If a click on a page of the site it is called three times.

Why this line into the functions.php file is called so many times?

The post types work well, but I don’t like that the plugin_setup code is executed so many times.

Thank yopu very much

Claudio