It seems, at least on my iMac, that the setting to use the GPU does absolutely nothing in Luminar 4. If I track CPU + GPU usage history, and then do some edits, turn layers on and off etc. the CPU spikes often but there's almost no GPU usage.
It's no wonder Luminar 4 is so incredibly slow. My setup is a 4.2ghz 8-core iMac with 64GB RAM and my photos stored on a fast SSD. There's no excuse for such poor performance.
Please Skylum, explain why L4 doesn't make use of the GPU for processing adjustments.
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