The fastest template for Shopify

Hi, guys! I have a problem. I can’t find a temple anywhere. I have a shop on Shopify. I need a responsive template with the fastest download speed…Any options? What can you advise? I’d appreciate it.

These are the best sellers https://themeforest.net/category/ecommerce/shopify?sort=sales but the download speed is going to be dependent on several things of which the theme is just one