i'm just working on some webcam capturing. It basically works fine so I use the built-in webcam of my macbook and display the image on the screen. But: As soon as I run the sketch on fullscreen the frameRate breaks down from 33 to 4 or 5 fps. I tested without using the filter(); -- this improved to frameRate up to 10 fps. But I need the captured image to be grayscale, so I don't want to get rid of this. 

Do you have any suggestions how to keep the frameRate high? At least a few more fps than now. 

2. import processing.video.*;
3. 
   
4. Capture myCapture;
5. 
   
6. void setup() 
7. {
8.   size(screen.width, screen.height);
9.   myCapture = new Capture(this, width, height, 30);
10.   frameRate(100);
11. }
12. 
    
13. void captureEvent(Capture myCapture) {
14.   myCapture.read();
15. }
16. 
    
17. void draw() {
18.   println(frameRate);
19.   image(myCapture, 0, 0);
20.   filter(GRAY);
21. }