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So I looked into it, and found out that the screen saver was taking some amount of CPU-time. On top of that, battery drained 50% in 2,5 hours working in Pages with some background Apple Music running, nothing fancy - to much for my nerves, knowing I spend 3,5 grand for this machine not even a year ago. Don't get me wrong, everything usable in a decent way, but with micro stutters and little hiccups on a regular basis. For example, I had noticeable lags while typing in Pages, as if this great Laptop was seriously to slow to process simple word processing.
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Now, on Big Sur 11.4, in July 2021, I was still annoyed by some level of choppiness of the UI, especially while running on the Intel GPU.
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UPDATE and found my personal solution after half a year.
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