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I'm now pleased to report that the GPU Acceleration/Metal/OpenGL problem in the Develop module of Lightroom Classic CC is FIXED - YAY!
Big shout-out to Simon Chen, Principal Computer Scientist at Adobe for the fix.
I knew it was going to be simple - and the file needed to cure the problem is a mere 28 bytes in size.
If you have this problem you can download the file, config.lua from this url https://adobe.ly/2yC7FLq
Just follow the video and all should be well.