These commands will add a persistent setting in windows's registry to force constant process priority for a specified executable (name related) (aka high priority for NAME.EXE)
Everything is included in a ready-to-use batch script. Just run "Surf's Prio.bat" as Administrator. UAC Prompt may pop up, if so, click yes.
It creates the following entry in the windows registry : [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\PROCESSNAME.EXE\PerfOptions] "CpuPriorityClass"=dword:00000003
Just remove the new register entry : [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\PROCESSNAME.EXE]