Fastest level (-mx1) : hc5 match finder with 256 KB dictionary.The compression ratio was improved for Fast and Fastest compression levels with the following default settings:.7-Zip now supports new optional match finders for LZMA/LZMA2 compression: bt5 and hc5, that can work faster than bt4 and hc4 match finders for the data with big redundancy.If the switch -ssp is specified, 7-Zip doesn't allow the system to modify "Last Access Time" property of source files for archiving and hashing operations. The speed of PPMd compressing/decompressing was increased for 7z/ZIP/RAR archives. It allows to increase the compression speed for big 7z archives, if there is a big number of CPU cores and threads. The default number of LZMA2 chunks per solid block in 7z archive was increased to 64.Self-extracting capability for 7z format.Strong AES-256 encryption in 7z and ZIP formats.Compression ratio for ZIP and GZIP formats: 2-10 % better than the ratio provided by PKZip and WinZip.High compression ratio in 7z format with LZMA compression.
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