Picking up on my earlier theme: -
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I replaced the Anker USB C Hub Adapter that I'd been using since I got this MacBook Pro in late 2018, with a uni USB C to DisplayPort Cable and found that Quartz Debug showed an increase in my Frames Per Second (FPS) figure from: -
to: -
Now I can't say that the problem was definitely with the Anker hub; it may have been with the HDMI cable that I was using betwixt the hub and the monitor BUT I did try two different HDMI cables, one of which came with the monitor itself.
Either way, I'm pleased with the outcome - even though I don't specifically need 60 FPS, given that I'm not creating video content or developing/playing games on this Mac - I spend most of my time in Terminal ......