Without OpenCL support, and relying on Metal or Software Only rendering, I get no real-time playback whatsoever with .mxf clips with one instance of Red Giant Colorista applied - even at quarter resolution. A massive number of frames are being dropped, with only occasional bursts of real-time performance.

This is with 4K source footage in an HD Sequence, both at the same frame rate of 23.976. I get better results with 29.97 source footage in a 29.97 sequence.

IDK if this matters or should matter, but I'm a full-time editing professional who uses the Adobe CC daily to make my living. I'm stuck on Pr 14.9 until Adobe makes performance with Metal just as good as it was under Open CL, or preferably better.

Specs:

MacPro7,1 - 2.7 GHz 24-Core Intel Xeon W - 256G RAM - AMD Radeon Pro Vega II 32 GB
ATTO R680 PCIe SAS SCSI RAID6 (8 drives - very fast io)
OSX 10.15.7
Premiere 14.9; all versions of 15.x are unusable due to bugs
Plugins: BCC, various RedGiant, VideoCopilot, DigitalAnarchy, DigiEffects, PlugInEverything, RE:Vision, Rowbyte, Zaxwerks, Vimager, and others
source codecs: mostly .mxf, .mov, .mp4
Seq: mostly HD 23.976 stereo