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by njitbew 1852 days ago
After upgrading my MacBook Pro 13" (2017) to Big Sur in Dec 2020 I had a similar experience. I use a 4k monitor and everything got super slow, fans started spinning, processes got throttled, and I could barely get any work done. I later did a fresh install of Catalina and everything was fast again.

I never did proper benchmarking, but my feeling was that resolution played a role. When using 1080p things were fast, but the resolution is unusable on a 27" 4k display. When using 2160p things were fast, but too small for my eyes. Any resolution in between (this implies things are being scaled?) was sluggish.

Note that this is a 13" model, so the problem does not seem to be restricted to the 16" model that the author is talking about.
1 comments
tomduncalf 1852 days ago
This matches my feeling that it’s a post-Big Sur upgrade issue, which makes me hope it can be fixed.

Has anyone spoken to Apple Support regarding this?

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tomduncalf 1851 days ago
See my other update: https://news.ycombinator.com/item?id=27254237.

I did a clean install of Catalina and same issue persisted so I think I have a hardware fault.

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