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What you are observing seems right to me. If I remember correctly the old code had a fixed image size, if I'm not mistaken it was 640x480. The new code appears to use the maximum resolution available and that probably makes rendering slow.

When running "OpenCV Tutorial 3 - CameraControl", press the menu control (three dots), select Resolution and lower it to something like 640x480 and see if it works as it did before.