A pretty interesting article on the PS3 slim I found on Toms Guide. Unfortunately I cant post the full article which includes comparison videos.
The new PS3 Slim certainly is thinner and lighter than the outgoing original launch form factor PS3, but has the new packaged gained any athleticism thanks to its new build?
If the results from a user-performed test are to believed, the PS3 Slim is slower than the old model when it comes to system boot times and loading of Blu-ray Disc movies, but the newer console comes out ahead when it's time to game.
A limited edition Metal Gear Solid 4 80 GB PlayStation 3 was pitted against one of the new 120 GB PS3 Slims. The older PS3 held a significant 7 second lead in terms of Blu-ray movie loading, while the new PS3 Slim loaded Batman: Arkham Asylum just a couple seconds quicker.