NUCE SUPAH! I think this is your best ever!
I feel your painF-16 is 10.000 pixels across and is currently 359 MBThe Zeros I'm working on are 250+ MB each. My computer doesn't like the files at all, especially saving!
Something interesting I came across recently; according to Adobe, Photoshop CS can access only 2 GB RAM. Anything more than that is isn't used by PS. Or at least for Mac OSX. I think that includes all versions of CS, they don't seem to list specs for individual versions of CS.
From what I've read, the clock speed of the processor and disc space, LOTS of FAST disc space are the only things that will really speed up PS.