Getting the colors via PixelGrabber causes the mouse events to be reproted slow on linux/solaris.

Aim of my program
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To display the RBG color value on the label ,when the mouse pointer is moved on the color.

Step to reproduce:
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1) Run the attached program. you can see a frame with four color on it .
2) Move the mouse on the any color & wait for some time. you can see the values are displayed on the lable which is at the 'South' of the Frame. Initially the values are displayed late say 3 to 5 seconds(for first time). For the next move of mouse on some other color,the label values are update properly.

This works fine in windows_xp for first time also. But the problem is seen only in solaris / linux. This is reproducable even in Tiger also. I tested this in Tiger RC B63 & Mustang 78.
Attached the testcase to reproduce.