How to make Add To Cart & Checkout BOOSTER PRO load faster?
By default, Shopify apps load after the page is generated. If you'd like to decrease the time it takes to load the app, follow the instructions below.
1. From your Shopify admin, click Online Store to arrive at the Themes page.
2. Find the theme you want to edit, click the Actions ▼ button, then click Edit code.
3. Click on the theme.liquid file that's located in Layouts folder.
4. Paste the following code snippet before the </body> tag.
5. Save your changes.