There is no imposed performance penalty for not activating any version of Windows.
Does Windows run slow if not activated?
There is no imposed performance penalty for not activating any version of Windows.
Is it okay to use unactivated Windows 10?
Additionally, you can use an unactivated Windows 10 without any restrictions for one month after first installing it. This means that your system will behave as if it’s activated for 30 days. After this period expires, the restrictions come into effect.