Performance spikes significantly while idle on the computer.
Want to share the processes as well? Or look thru your Services? Without knowing what you have installed, we can't help. Or did you think we're magic?
It's using an NVMe storage device.
Open processes, arrange them by CPU usage. Examine each one closely. Respond appropriately to what they're doing.
your system experiences high usage occasionally
Navigate to the Processes section and arrange by CPU usage. Identify the high consumers.