In Windows 10 and under an administrative account you can specify which cores (of your presumably multi-core processor) gets used for explicit apps. Why would you want to do this setting?

Windows includes a feature allowing you to force the operating system to utilize only a portion of the computer's available processor cores. If you are a software developer, this allows you to see ...

ParkControl lets you set the CPU Frequency Scaling and manage, control & tweak Core Parking settings in Windows computers, to get the best performance.