Certainly something I’d be interested in (a lot of our sites use repeaters, and sometimes just a bit too many for the server to load up at one time).
A way to lazy-load the content as you scroll down the page would be fantastic and wouldn’t eat so much resource when loading the back-end to edit, add or remove more fields!
Sorry to beat a paralysed horse here, hopefully it’s something still on the radar.
(Or maybe I can have a bash, too!)