>I also have a i7 with the same programs loaded >and 4Gb Ram and likewise I work in the same fashion, but not >with to marked difference.
I think the biggest impact to photo processing speed is the amount of RAM. CS5 and LR both use huge amounts of RAM and if it runs out, it switches to virtual memory on the hard drive, and then things slow to a crawl. 12GB of RAM is why my machine handles CS5 and LR so well. The speed of the processor is secondary.