No issues anymore with Safari browsing, typing in Pages and so on. So, I decided to switch the screen saver off to test this out and guess what - my MacBook Pro 16 inch went instantly back to snappy UI handling. I had this switched on all the time because I use remote access from an iPad often, and sometimes the system would have long idle times. This, of course, without it being active, because I was using the system. 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. 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.

UPDATE and found my personal solution after half a year.

Macdown laggy