There are a couple of problems here....
Here's a link to the html5 demo. Run this and test your browser if you wish. HTML5 Link
If you'd like to tinker with the capx then here you go. My original plan was to fade in/out a "jank" indicator every time the dt exceeded the normal time, but it never worked in Chrome (see below): jank capx
This simple test moves the camera lerp target every second, then the camera lerps onwards over a seamless tiled background.
I see two problems here:
My system spec: AMD A10-5800 with NVIDIA GeForce GTX 750 Ti. The same happens on my old wheezy i5 laptop as well.... Anyone any thoughts?
Edit - update with a non-subtle Jank indicator (does not work in Chrome).
Edit 2 - Further testing has shown that Edge is really quite good, with minimal jank / dropped frames.