I also note that FCP cannot play the 5Dii files at full resolution without hiccuping - seems to be OK at about 50% res. Strangely however, QuickTime Player can play them well...
My solution for editing in full-res is to convert the files to AppleProRes 422. (I convert the 44.1 kHz sound to the FCP standard 48 at the same time.) This _increases_ the data rate of the files about 5 to 6 times, but the video plays smoothly and FCP has no problem editing.
Lisa thanks I think Ive found it
Im awaiting the maximim RAM for my machine anyway
How do you convert them to pro res
is there a batch method
I assume it takes some time but that doesnt matter if one is doing something else