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cv::solve OpenCV 3.1 vs. 3.2 speed

Dear OpenCV community

I decided to change to 3.2 but realized that in this version the cv::solve with DECOMP_QR is much slower than in 3.1. I observed increase even from 400ms to 12sec for large matrices.

I am using the standard configuration of OpenCV, with OpenCl and AVX2, on an i7 4770, without GPU . My question: is there a difference in using OpenCV 3.2 in comparison to 3.1? I could imagine there are some changes in the optimization of the code, but do I need to activate/deactivate something?

Finally, is there currently an optimal configuration for modern Intel i7 to gain maximum performance (without CUDA)?