Ok, I've upgraded to Mountain Lion now and that hasn't made Premiere any faster. However I've just been looking at the Scratch Disk configuration and they are all set to 'Same as Project'.
So here's my new question. I have 4 internal HDD's. At the moment the OS and Premiere Pro is on disk 1. Disk 2 is currently recieving my Premiere Pro project files and disk 3 and 4 are completely empty ready for footage or anything else. What is the best way to set up the Scratch Disks and Premiere Pro's Media cache(s)?
For reference the scratch disk options are currently:
1) Captured Video - Same as Project
2) Captured Audio - Same as Project
3) Video Previews - Same as Project
4) Audio Previews - Same as Project
Currently my 'Media Cache Files' are being sent to disk 1 and this is also where my 'Media Cache Database' is located.
So what should I change?
With four drives I would put the OS and programs on one, the projects and misc media on two, the footage on three and the cache, previews, and anything you delete after a project is finished on four.
I'd set it up so you have OS and programs on one drive, and then configure the other 3 drives as a raid0, and use that for all your media and scratch discs. Much faster.
Raid 3 drives and if ANY of them fail, you loose everything. No bueno.