Application Running Very Slow.

Dear Sir / Maam,
My Self Pradeep Kumar Swarankar from Ajmer, Rajasthan, India.
I am your user : pradeeps17 in your envato market. Last some time we purchase (GoGrocer | Grocery, Vegetable & Food Delivery App | 6 Apps with PHP Backend) a code from your site. My developer make apk and run, but android user application running very very slow. This is very bad experience. Please resolve my problem, otherwise refund my payment.

Pradeep Kumar Swarankar