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Probably you used the 2.4.5 library with and without TBB to compare, however, since OpenCV 2.4.3 multithreaded support functionality has been included in the source code, not needing to build openCV with the TBB support anymore. It is done automatically where necessary and the included dll's are contained in the source where needed.

About IPP, don't think that the increase will be worth the payment, since you can only get a 30 day trial version for free.