1) Open 'Registry Editor'
2) Goto
KEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Windows NT
CurrentVersion
Image File Execution Options
3) Add key to "Image File Execution Options" - set name 'app name.exe'
4) Child key - set name 'PerfOptions'
5) Create file DWORD (32-bit) Value - CpuPriorityClass
6) Value data - 3 (High prority)