BBQScreen lets you see your Android device's screen on your computer at fullspeed.
REQUIRES ROOT!
Unlike many Phone-to-PC screen sharing app, BBQScreen lets you see your device's screen in realtime and at a high framerate. It's super easy to setup, and can work through Wi-Fi, USB Tethering, or even Bluetooth tethering (best experienced with Wi-Fi or USB Tethering).
Don't hesitate to reduce screen scale for more stability, or if no frames are received.
Get and install this app on your Android device, and get the latest client app on your computer at http://screen.bbqdroid.org. You just have to enter your device's IP address, and it's working immediately.