Buy a windows laptop and be happy, macos is trash rn and it will be worse in next releases.I looked on my Mid-2010 High Sierra Mac Pro and there are 4 'trustd' processes running. The one for 'root' is using most of the CPU Time of the four and upon boot up, garnished the highest use of all processes.
There is no system.keychain that I can find anywhere in the library folder.
They are users.... '_locationd, Levi(that's me), root and _spotlight'