We are working on the article where we will present in-depth look on this extension, covering what Piotrek wrote above as well as some additional things :) We are expecting to publish it some time in the middle of next week.
Great news, thanks for braking it, can't wait already.
Few more questions which could perhaps be addressed by the article:
- the packers for JS/CSS - how to get most of those? how are multiple calls handled and can they be optimized? - how to prepare/optimize non-ezjscore layouts (prior to 4.2.x, plain, dedicated etc) for the new JSCore extension