Improved audio stability Cubase 7.0.6

Hi There

Im new Here

Just upgraded my cubase to the lastest version and you’ve mentioned that
Cubase 7.0.6 Improved audio stability ?

A new “compatibility” switch is now available under Device Setup > Devices > VST. If enabled, the ASIO threads are set to Windows MMCSS mode to improve the overall audio stability.

My question is where is this switch as I cannot find it ?

Many Thanks

If your audio interface supports MMCSS, it is automatically enabled.