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I also ran the openCV performances tests on features2d (following this) for version 3.4.3 and 3.4.4 and get the following result for this test name : batchDistance_Dest_32S::Norm_CrossCheck::(NORM_HAMMING, true)

This function is called in the brute force matcher when the Hamming norm is used and cross check is set to true. I observe the same difference in terms of computation time in this two particular versions as my tests shown (in my previous post)

Do these performances tests has been performed by someone else for these versions: 3.4.3 and 3.4.4 ? Are my CMake flags not good ?

Thanks a lot. I can send you the results of these performances tests (.xml) if you need to. (I'm on Ubuntu 18.04.2 LTS)