Interesting! I’ve been using Swup for the past three years in my core Wordpress theme, and am quite happy with it. It takes some getting used to (like with how third party scripts will take some special care, since a JS page replace doesn’t always trigger script load events), but once you know the basics, it’s a powerful and neat tool to speed up a website that has a CMS.

The one thing I’m looking forward to in v4 is more advanced hooks, so I can do “fade into eachother” animations. Right now content is replaced in the same container, but it would be real cool if we could have the from and to page exist together during the transition.