Fast level (-mx3) : hc5 match finder with 4 MB dictionary.

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.

New localizations: Tajik, Uzbek (Cyrillic).

The bug in versions 18.02 – 21.00 was fixed: 7-Zip could not correctly extract some ZIP archives created with xz compression method.

The improvements for speed of ARM64 version using hardware CPU instructions for AES, CRC-32, SHA-1 and SHA-256.

The command line version of 7-Zip for Linux was released.

Some changes and improvements in ZIP, TAR and NSIS code.

The speed for LZMA and LZMA2 decompression in arm64 versions for macOS and Linux was increased by 20%-60%.

The command line version of 7-Zip for macOS was released.

It allows to extract correct file name from zip archives on different systems.

7-Zip now writes additional field for filename in UTF-8 encoding to zip archives.Minor speed optimizations in LZMA/LZMA2 compressing.The maximum dictionary size for LZMA/LZMA2 compressing was increased to 4 GB (3840 MiB).

The 7zip Release Notes tell you what has changed in every new version of the program.

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