How will Scroll Up Button affect my page speed?
When you install Scroll Up Button, we add a script to your store. Shopify is very careful to not allow script tags added by apps to affect page load times, and ensures that your store is fully functional before allowing any extra code to run. You may see our script show up when running page speed or SEO tests on your site. We’re continually improving our app to ensure this script stays as small as possible.