got -- 973MByte !!!! ( that is 71 Mbit/s instead of 13 Mbit/s) why should I update , before someone else can give me a proven advice doing so ? Hehehe man u kill me. I can however only begin to understand your frustration with this. From what I have "overheard" this issue is trying to be addressed but there is no definitive solution as yet. I don't use iMacs but I have a few Mac Pros so I have been down this road before. Tried different GPU's, even changed CPU's from 2,4 to 3.06Ghz (have to admit it was a pet upgrade as well)...and bit rate and size outputs varied considerably. Apple touting ATI GPU's instead of CUDA support still bewilders the hell out of me and as for METAL...well, hmm let me remain calm and say nothing. Good luck with Resolve Studio. Great for collaring but sucks as an NLE unless you have a seriously strong (yet again ATI) card. Still a bit finicky as a NLE in my opinion. Fusion effects rely very heavily on the GPU and if you aren't used to node based workflows its going to be a bit of a uphill. Best of luck and apologies for going slightly off topic.
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