How to make Upselly load faster?

By default, Upselly doesn't insert any script inside your theme files.

That being said, Upselly is loaded into your store via  Script Tags as recommended by Shopify. However, for stores with many apps and many scripts running, it might result in a slow loading speed of Upselly.
To make Upselly load faster simply go to app settings and enabled Quick Load feature.
Once enabled you can find a line of script similar to:
<script type="text/javascript" async="" src="https://upselly.azurewebsites.net/Scripts/store.min.js?env=https://upselly.azurewebsites.net&v=1&shop=upselly-store.myshopify.com"></script>
at the end of your theme .liquid template. That's all.
To ensure clean uninstall please disable Quick Load feature before uninstalling the app.