[tyingq]

It changes the page fairly dramatically. Before rolling out a page, you run it through their parser, which creates skeletal html and a javascript stub which you serve in place of the original html.

Then, when this substituted page is loaded, their javascript rebuilds the original web page with calls to eval() and whatever.innerHTML, in a way that the dependencies are supposedly streamlined.

[joveian]

Ug, just what we need - more pages that don't work without javascript :(. You know what really speeds up the web? Turning off javascript...

[youngtaff]

InstartLogic have been delivering a service that does something similar for a few years - not sure how good it is though