prevent increase CPU usage by ajax

/* prevent increase CPU usage by ajax */
if ( ( defined( 'DOING_AJAX' ) && DOING_AJAX ) ) {
    $by_pass = array(
        'oembed-cache',
        'image-editor',
        'delete-comment',
        'delete-tag',
        'delete-link',
        'delete-meta',
        'delete-post',
        'trash-post',
        'untrash-post',
        'delete-page',
        'dim-comment',
        'add-link-category',
        'add-tag',
        'get-tagcloud',
        'get-comments',
        'replyto-comment',
        'edit-comment',
        'add-menu-item',
        'add-meta',
        'add-user',
        'closed-postboxes',
        'hidden-columns',
        'update-welcome-panel',
        'menu-get-metabox',
        'wp-link-ajax',
        'menu-locations-save',
        'menu-quick-search',
        'meta-box-order',
        'get-permalink',
        'sample-permalink',
        'inline-save',
        'inline-save-tax',
        'find_posts',
        'widgets-order',
        'save-widget',
        'delete-inactive-widgets',
        'set-post-thumbnail',
        'date_format',
        'time_format',
        'wp-remove-post-lock',
        'dismiss-wp-pointer',
        'upload-attachment',
        'get-attachment',
        'query-attachments',
        'save-attachment',
        'save-attachment-compat',
        'send-link-to-editor',
        'send-attachment-to-editor',
        'save-attachment-order',
        'media-create-image-subsizes',
        'heartbeat',
        'get-revision-diffs',
        'save-user-color-scheme',
        'update-widget',
        'query-themes',
        'parse-embed',
        'set-attachment-thumbnail',
        'parse-media-shortcode',
        'destroy-sessions',
        'install-plugin',
        'update-plugin',
        'crop-image',
        'generate-password',
        'save-wporg-username',
        'delete-plugin',
        'search-plugins',
        'search-install-plugins',
        'activate-plugin',
        'update-theme',
        'delete-theme',
        'install-theme',
        'get-post-thumbnail-html',
        'get-community-events',
        'edit-theme-plugin-file',
        'wp-privacy-export-personal-data',
        'wp-privacy-erase-personal-data',
        'health-check-site-status-result',
        'health-check-dotorg-communication',
        'health-check-is-in-debug-mode',
        'health-check-background-updates',
        'health-check-loopback-requests',
        'health-check-get-sizes',
        'toggle-auto-updates',
        'send-password-reset',
        /* Start custom action */
        'vc_media_editor_add_image',
    );
    if ( isset( $_POST['action'] ) && in_array( $_POST['action'], $by_pass ) ) {
        return;
    }
    wp_die( '0', 400 );
}