Is there a keyboard shortcut to silence JAWS? [on hold]

I'm testing a web application's accessibility with JAWS 15. I don't want JAWS to keep reading when I'm not actively testing something so I have to keep shutting the application down and starting it back up again.

Is there a keyboard shortcut to toggle JAWS on and off? I guess I could just use the mute button on my keyboard, but that doesn't stop JAWS from trying to keep up with what I'm doing and wasting CPU cycles.