Hmmm… with ProRes 422 shouldn’t be a problem. What is the available RAM on your MBA? The drive is a single, USB 3 self powered drive?
Generally, ProRes 422 on a external RAID would be the best. And 16GB RAM. Can you post a screenshot of your ‘About this Mac’? Would like to know what GPU and RAM you are running.
I live in Singapore. Time zone +8GMT, that’s why the late replies:)
K