After reading your response, I decided to launch the game (max settings of course, and capped at I think either 60 or 72fps) and see what you posted for myself, and ya, you're right. 1 main core used heavily and several cores being used for "child tasks". So does the dedicated server also work like this or is it a little different / even more single core focused?
PS: I'll be afk for the whole weekend, so I probably won't be able to read or respond until Sunday night or later.