Use this registry entry so you don't have to set the priority every time you launch the game:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\witcher3.exe\PerfOptions] “CpuPriorityClass”=dword:00000003
Is that already in there or do I have to create it and if so how to again ?? Have not done this in so long that I forgot lolll!!