CPU Affinity Performance Shortcut

C:\Windows\System32\cmd.exe /C start "" /affinity xx "C:\Your_Program.exe"
 
xx=
01 - 1st CPU
02 - 2nd CPU
03 - 1st and 2nd CPU
04 - 3rd CPU
05 - 1st and 3rd CPU 
06 - 2nd and 3rd CPU
07 - 1st 2nd and 3rd CPU
08 - 4th CPU
09 - 1nd and 4th CPU
0A - 2rd and 4th CPU
0B - 1st 2nd and 4th CPU
0C - 3rd and 4th CPU
0D - 1st 3rd and 4th CPU
0E - 2nd 3rd and 4th CPU
0F - 1st 2nd 3rd and 4th CPU
For CPUs with more cores, just continue the pattern.