The Host: Local System service is a collection of system processes, or let’s call it a generic container to host services. It contains processes such as Windows Auto Update and many necessary system services that run within it.
As a result, it is very likely to use a lot of hard drive, memory, RAM, and even network bandwidth, draining your computer’s resources, especially after Windows 10 updates.
What causes high CPU usage from Service Host: Local System?
It can be caused by improperly running programs, services, or corrupted system files. It can also be caused by malicious software.