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I'm not familiar with the names of the various Mac OS's, but I've seen information that the 13.x build works best on the last three numbered versions.
Apple is wishing to move away from OpenCL, btw.
Gotcha. Thanks for your help on this!
I'm also on an iMac Pro, Vega 64, V 13.0 premiere, and MacOS Mojave V10.14
I've noticed metal does play better than in previous builds. However, openCL still runs smoother in live playback for most files I'm working with.
I think the gap is closing, hoping adobe continues pursuing metal improvements since openCL is on the way out....