Yesterday I've finally found some nightly free time that as used for the installation of a lazy loader on http://premflux.com/fav/
I'm currently using Infinite AJAX Scroll. (let me know if you know/use a better one)
I tested the UI on all my devices and everything seems to be working fine but I would like to hear some feedback from real users.
The next improvement I have in mind for a smoother UX would be the loading of equally sized chunks of bookmarks instead on the current per-folder-grabbing .... but that would be for when I get some free time again.
Anyway, thanks in advance for your feedback!