I use MT all the time. I found 2.6 may be faster, but more unstable than 2.58.
With 2.58, I don't need to use setmemorymax. With 2.6, I baisically need to use setmemorymax(768) all the time.
Also, I only enclose the bottlenecks in my script, like fft3d, hqdering, or mdegrain 2 in MT(""" """)
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