* an error, it will undermine the Panels engine's lazy-loading logic and
* negatively impact memory usage.
*
+ * Note also that including a conditional on the plugin type so that you only
+ * define plugins for directories that you have actually populated with plugin
+ * include files is another small contribution to performance that you can make.
+ * For example, if you define only content_type and context plugins and don't
+ * want them at the root level of your module directory, this code would work:
+ * @code
+ * function MYMODULE_panels_include_directory($plugin_type) {
+ * if ($plugin_type == 'content_type' || $plugin_type == 'context') {
+ * return 'panels_inc/' . $plugin_type;
+ * }
+ * }
+ * @endcode
+ *
* @param string $plugin_type
* The plugin type for which the Panels engine is currently requesting the
* location of an include directory.