481,487c481,491
<   $site_detection = variable_get('mobile-tools-site-type-detection', 'mobile_tools');
<   drupal_load('module', $site_detection);
<   if ($site_detection == 'mobile_tools') {
<    return _mobile_tools_site_detection();;
<   }
<   else {
<    return module_invoke($site_detection, 'is_mobile_site');
---
>   static $site_type = NULL;
> 
>   if ($site_type != NULL) {
>     $site_detection = variable_get('mobile-tools-site-type-detection', 'mobile_tools');
>     drupal_load('module', $site_detection);
>     if ($site_detection == 'mobile_tools') {
>       $site_type = _mobile_tools_site_detection();;
>     }
>     else {
>       $site_type = module_invoke($site_detection, 'is_mobile_site');
>     }
488a493
>   return $site_type;