Megabit, my 4k 10 bit Gh5 footage plays at a decent clip without hardware decoding acceleration (I have an AMD GPU that isn't supported yet, and no quicksync), so something must be up with your setup. I do still proxy for multicam, but just one angle at a time does ok.

Yes - after comparing what people write here with my own, poor results - I come to the same conclusion. But what may be wrong, if in Resolve or Scratch or Nuke I am still getting full 50 fps so easily? This is a long shot, but perhaps the mere presence of 2 GPUs in my system makes Vegas 17 lost on how to use one of them? The 2160/50p files play back at a maximum of some 35 fps, with or without GPU acceleration enabled! The only other possibility is that VP 17 can't work well with architectural quirks of my 2990WX ...

How does one report a support ticket with Magix?

Piotr