Further processing speed test, for the same P45+ file, 8 bit, approx 112MB on MacPro Quad 2.66:
CO 377: 17 sec
CO 378: 17 sec (no significant gain, for MacOS 10.4.11)
CO 4: 10 sec
Lightroom 1.3: 10 sec (as fast as CO4, but I'd still prefer CO4 out of the box colors).
HTH