The multi-core CPU using

In which process is the multi-core CPU used in the “blender” (except rendering)

There are so many areas in Blender …
You get a linear graphical CPU monitor where you can see a history of the work of each thread, and then you do tests in Blender. For example in Linux:

I would say that Cycles rendering is one of the few tasks that optimally uses all threads. Then there are other multi-threaded processes like simulation or sculpt mode with multires, but where you can see maybe some of the threads working near 100%, but the other threads between 50% and 70%.

Thank you for the interesting and reply. I tried some things based on your answer. I’ve seen in which cases gpu and cpu are used. Thank you.