You can edit the registry to have APB run in high priority automatically.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\APB.e xe\PerfOptions]
"CpuPriorityClass"=dword:00000003
Save that as a .reg file in notepad and run it. Delete the space in "e xe".