• I'm working on a 5k iMac at the mo, and it's rather good. Only offlining HD video in Premiere, but it's nice and nippy. I reckon it could easily do some heavy lifting - I've cut 4k prores on a lower end iMac very happily before. I bet this iMac could come close to realtime grading of 4k raw stuff if you had a fast enough drive.

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