However, "smart" isn't always "right." If you need manual control, you have to trick Windows into reapplying the affinity every time the program launches. This is the cleanest "native" way. You will create a batch file that launches your program, waits a moment, and then forces the affinity.

Let’s look at how to make CPU affinity in Windows 11. Why doesn't Windows save affinity permanently? First, a quick reality check: Microsoft doesn't offer a "Save Affinity" button in Task Manager for a reason. Modern CPUs use heterogeneous architectures (P-cores vs. E-cores). Windows 11 is actually smarter than previous versions at automatically parking threads and moving workloads to the correct cores to save power or boost performance.

Windows 11, like its predecessors, treats CPU affinity as a temporary suggestion, not a rule. By default, the operating system’s scheduler handles core distribution dynamically. But what if you have a specific need? Perhaps you’re running an old game that crashes on multiple cores, or a real-time audio application that needs a dedicated core to avoid pops and crackles.

Open Notepad and paste this template:

We’ve all been there. You launch a demanding game or a legacy piece of software, open Task Manager, right-click the process, and click "Set Affinity." You carefully uncheck "CPU 0" to balance the load, click OK, and smile.

Have a legacy app that hates multi-core CPUs? Let us know in the comments below!

Then you restart the application, and poof —your settings are gone.