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Old 9th July 2012, 16:14   #7
DrO
 
Join Date: Sep 2003
Posts: 27,873
lzma can support multi-threaded compression but only if the compressor is coded to do it and NSIS uses a heavily altered version which is single-threaded (and i cannot remember if the multi-threaded lzma libraries were around when the NSIS lzma support was added).

-daz
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