I have found that DPP and EOS Utility are my fastest options when shooting tethered. I find that LR1.2 is a little slower than DPP in loading the images. I do not own C1Pro but may download the new v4 and test. I am running OS10.5.6, DPP3.4.1 and EOS Utility 2.5.1 on a late 2008 MBP with my 1DsII.