"Set Priority" & "Set Affinity" not allowed via the Task Manager

[Miltos]

Hello, i'm trying to set the Affinity of the game to specific cpu cores so i can use the rest for OBS, but the game does not allow that via the Task Manager (access denied).

As a result, the game is constantly fighting for CPU resources against OBS and causes the streaming program to drop frames.

[Two]

Navigate to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options

Right click Image File Execution Options go to new, then press key:
Name it "Realm.exe"

Right Realm.exe go to new, then press key:
Name it "PerfOptions"

Right click PerfOptions go to new, then press DWORD (32-bit):
Name it "CpuPriorityClass"

Double click CpuPriorityClass, set value to 3 (This is for priority to be set to high)

[Miltos]

Thanks for your comment but i'm more interested in splitting the cores between the game and OBS rather than setting the priority of the game.
I can already set the priority of the OBS below normal or above normal if i want to but the game still uses all the cores.

If you're confused, let me give you an example.
I usually assign the game 6 threads and the rest to OBS. That way, the game doesn't interfere with OBS and vice versa.
Now what's the problem? I can already set the number of cores to be used by OBS but i cannot set the cores to be used by the game, so it uses the cores that OBS is currently encoding at.
Not to mention the microstutters.

Is there a similar registry hack for the affinity rather than the priority?
Again, thank you for your time.