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Did you build it from source or installed it with apt-get?
If you built it, I would say you used bad cmake flags. Apt-get should give you a solid installation, but building it can yield more optimized binaries.
Make sure the build type is release, OpenMP is on and verify what optimization flags your CPU supports, like ENABLE_AVX.
The easiest way to know the flags is to run cmake-gui on the source code. If you don't have it, a simple
sudo apt-get install cmake-qt-gui
should do the job.