Personal opinion -
Macs are crap.
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Professional opinion -
GPU performance is primarily for displaying images/graphics. I don't think it's as comprehensive as it is in the likes of Photoshop or Illustrator.
It might have something to do with higher resolution displays, like Retina displays. GPU isn't always efficiently used for tasks beyond image rendering, which can make performance seem inconsistent.
MacOS updates can sometimes introduce changes to how applications interact with hardware, especially the GPU. If InDesign is not fully up to date/optimised for the latest macOS versions, performance issues can arise.
Mac OS updates are released and InDesign is left to constantly catch up and this can cause experiences temporary performance glitches or display problems.
Retina displays have high pixel density and it demands more GPU power to render elements smoothly. When InDesign isn't properly optimised for these high-density displays, users may experience lag or poor visual quality in some parts of the interface, especially when zooming or scrolling through complex documents.
The new Mac models are integrated GPUs rather than dedicated graphics cards and in my experience struggle with InDesign's GPU performance.
Okay, thanks!