I am shooting a short on the Sony a7sii. I will be shooting in UHD 1080p24 100 mb/s and 1080p120 100 mb/s. I'm running on a 2013 MBP with 8 GB of RAM so naturally I need to transcode my footage to a proxy format for faster editing in CC 2015. I've done this before, transcoding 1080p24 footage shot on the Canon 70D down to Quicktime H.264 files at a 8 mb rate and it was pretty good, but I think it could be faster.
I'm looking for suggestions on if I should transcode my footage to either 720p24 Quicktime H.264 files at 5 mb/s, or 720p24 Quicktime ProRes Proxy files for a faster playback. I'm not concerned about the smaller frame size, as I will do the work of correcting any potential scaling issues that arise by going from 720p to 1080 when I replace the proxy footage with the raw footage during the color correct phase. All I care about is speed, the image I edit with doesn't no need to be above medium quality by any means.
Did you ever find an answer? I'm thinking of transcoding my DSLR footage to DNX LB 1080p for offline on my laptop. Or lower res .h264. I found once the multicams are loaded the drive and or laptop really slows down.