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Considerations: A. Do the color-frame less frequently, for example at 10 fps (every 6th frame if you run at 60fps). Small lag won't be that noticeable; B. Render color-frame at lower resolution, e.g. 1/4, if you don't need pixel-perfect precision; C. Render only one pixel that you need below the cursor. I'm not confident with the math, but surely there's ...



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