Script loading parallelized in browser

turn this:
![before](https://f.cloud.github.com/assets/149541/591983/5bee23de-ca0f-11e2-8dd7-394cac83bfd9.png)
into this:
![after](https://f.cloud.github.com/assets/149541/591987/6277b030-ca0f-11e2-8736-23d7462ade76.png)