From memory, all the rings rotate separately, don't they?
I remember a while ago when I was trying to run the game Portal on my old not-built-for-gaming laptop, and there's a particular spot with a staircase made up of individual moving pieces - and if I looked at it, it brought the computer to a crawl, but looking away fixed it again.)
So, it could be the same sort of issue, with the determining factor being whether the 'busy' area is displayed on your screen or not.



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