Build for cordova/phonegap(mobile app)

Hi ! Sorry for my bad english i’m french

Last month i buy one template. when i install on the real mobile the menu of template run slowly… Because the code it’s bad…

I want buy this template https://themeforest.net/item/bemobile-mobile-tablet-responsive-template/15020186 but i have afraid they have a same performance.

How i can contact author ?
Can you advice me for the template ?

Thanks