Lazy Load Background Images
Here is an example integration of jQuery.Lazy for lazy loading background images powered by CMS.
jQuery.Lazy: http://jquery.eisbehr.de/lazy/
Here are some good resources:
Using custom code in the head and body: https://university.webflow.com/article/how-to-add-custom-head-and-body-code-to-a-webflow-site
Using custom code in an embed component on the page: https://university.webflow.com/article/embed
Webflow does not typically provide support for custom code integrations, a good resource to get help is on the code help pages: https://forum.webflow.com/c/publishing-help/custom-code