well thanks for the answer. Good that you consider multithreading an important point. I thought that lzma2 the main advantage over lzma was exactly that - multithreading. In the last years CPUs have not improved a lot on singlethreaded speeds, but got way more threads/cores so speed improvements are largely depending on multithreading. If there is multithreading for lzma I would not think there is a need for lzma2. But I think lzma2 will be way easier concerning multi threading as that was the goal for creating it.
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