(This happened on Map 2018; but I suppose this is a basic question).
AFAIK AutoCAD uses is not "multi-threading", so it uses only one thread. My PC has 6 Cores and 12 Threads, and when I run the Cadalyst-benchmark, I get a CPU of approx. 8% (100%Total / 12cores = 8% full load of one core).
See Picture.
When it "began to hang" in MAP 2018 - I can still work, but I see that the CPU is going to 20-25%. Continuing work, and then close database and close drawing - so Acad should to absolutely nothing - I have a stable CPU load of 50%, spread over all cores.
See other picture.
How can this happen? 50% on a one-thread-application?
Does it happen to others too?