Would it be a good idea to go back to 10.5.5. I don't really care about the speed as long as I have got the shot in the camera buffer. Crashes really can take the flow out of the shoot. My wife partner just compared PO to RD in processing a Canon cr2 file & the PO processed file is more neutral, she really likes this SW.
There are three things that kill the buzz and two are non acceptable. 1. crashes, 2. lost files, 3 slowdowns.
The first two are devastating , the third just damn annoying.
If your tether with eos utility and use a cf card in the camera, if the connection breaks at least you'll have the images on a card.
Obviously Apple is playing some kind of game with the speed of their usb drivers but macs have become less stable through the last few years, with different firewire port power and just a whole list of other changes.
I actually find the way 10.56 works is more pc like that most pc's, so I just bit the bullet and bought a vista notebook for tethering the Canons. It's rock solid and fast and easy and there is a cheap download call Mac Drive or something like that that allows a vista machine to read an apple drive so you can transfer from both systems.
I also don't dislike eos utility. It is more full featured that most people realize and for tethering it does almost anything you would want and dpp does produce good color and a great preview.
It's hard to blame phase for the tethering of a canon camera. In fact I'm surprised they even allow it at all because whether anyone thinks it or not, Canon is a competitor to phase.
Still, for the last year I've tried to get away from tethering as much as possible. I just don't like the process of being hooked to a cord and every frame is coming up on the computer. I don't think it's that fast, I do think just the process of tethering slows down a shoot. When possible I just shoot to cards and the tech downloads using photomechnanic which is probably the best ingesting/sorting software made.
Some jobs you just have to tether, but when I don't, I found we shoot more, faster and easier working this way than working tethered being called over to the computer for every 5 frames to discuss the shot and then go back to shooting.