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One issue I found: The prebuilt binaries are built without TBB support e.g. SURF feature extraction is not parallelized. (And I suppose other functionality as well) This makes sense for applications that parallelize over images, but applications that depend on processing image by image (such as a live video stream) benefit from TBBs.
Also I don't really get (because it is nowhere mentioned I think) which parts of OpenCV are parallelized and with which method. When building the library you can chose one/some of plenty of parallel processing frameworks that OpenCV should use. However, it is not clear which parts are actually ready to work with every framework.
