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Why cv::CascadeClassifier works slover in 320 version?

I have found in one of my projects, that cv::Cascadeclassifier from the new 320 opencv becomes to work slower compare to 310. Why so? I am manually build both versions with pretty same settings.

After some researches I have also found that if object size becomes smaller than in new version speed of detection increases whereas in the old version speed decreases. It seems that scaling method has been changed from the downscale sceme to upscale. Am I right? Did someone else notice that?