Why is the windows 7 update process eating so much RAM? And why is the percentage so strangely loaded?

Question

Windows

Sometimes so.

Sometimes so. (two cores for wimps)

And sometimes one RAM is stupidly loaded.
In general, I ask you to explain in a couple of words how it works. what where where.
Or at least say who knows.

Answer 1

Memory is clear.
They took one piece, unpacked it, put it where it should be.
Freed up memory.
Repeated with another piece.
With the processor too - this procedure uses only 1 core. Apparently, in order for you to work quietly on the second core and the update does not bother you.

Answer 2

There are two types of Windows updates. Some simply replace files with newer versions (or add files that didn't exist). Others look for the necessary sections in existing files and replace them with new inserts. The second option allows you to greatly reduce the size of downloaded updates, but the patching process itself consumes more resources than simple unpacking.
Plus, during the update process, a lot of work is done on changes to the registry, which in itself is a file system in a file, work with manifests, superfetch, and a bunch of other troubles and crutches.
So don't bother. Brakes when updating are defected by design, an integral part of Windows.