extra loading after clicking “add review ” button

Hello there !,

I installed this plugin ” Customer Reviews for WooCommerce ”
it installed perfectly ,and working as well but it takes huge time to reload to add the review(about 10-20 seconds it take ) .So could you help me to figure out this issue .Because I need this plugin for adding images with review. And I think it is the best choice for me .I also find other plugins too but their review images style and others think is not looking great to me . So could you tell me how to decrease the time of loading of this plugin adding review ?

Thanks