I guess you are looking at the cpu usage that GP shows at the top right? I lately bought a NUC13i7 also with a newer cpu and noticed the same. This is because the usage is relative to the currently available clock-speed. When you’re having more load, the OS will crank up the clock frequency and then the usage will drop. It’s like a dynamic ceiling.
You can check this out by using the ultimate power plan (temporarily or definitely). That will (probably) make GP show a lower usage.
Somewhat related: E Book power options do not work for me in Win11 - #22 by npudar