Alternatives to using Texture2D apply to display color images from Kinect camera

Hi all, I am currently working to display live video images from Kinect camera to Unity. I have managed to do so using a Texture2D component attached to a plane object and then updating the Texture2D using Texture2D.Apply() in the Monobehavior.Update() method. The framerate is pretty poor at 15 to 18 fps.

 void Update()
 {
     tex.SetPixels32(KinectSensor.ColorImage);        
     tex.Apply(true);           
 }

There are several posts that says Apply method is very slow and an alternative should be used to improve the framerate. However, I cannot find a definitive answer to this. Can anyone help me out with this?