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Is your desktop wallpaper resized on the desktop?
If your wallpaper on the desktop is a different size to your resolution and your desktop setting is to stretch the image when you scroll or drag windows around it has to recalculate the dimentions of the wallpaper all the time. This is especially bad if the image is out of proportion to the size of your desktop too.
To fix this you would open the image you were using as the wallpaper and resize it to the resolution you are using and save it as something else then select the new image as your wallpaper.
This is just an idea, as this gave me that problem.
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