Windows low performance after new OS installation

[Windows 10]

HiIv had a new fresh windows 10 pro installation on a totaly functioning computer, the previously os was windows 10 pro too .since the new installation everything in very low performance . i didnt change anything. just reboot with the new installation usb and installed the os. that it. im NOT looking for boost performance advise , im looking to understand WHY does it happened . i can tell that hardware is totally ok. thanks

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