Date Version New features compared to previous version 2008-04-13 0.1 Multithreaded compression Overlapped I/O Tornado and LZMA:ht4 are used Blockwise compression 2008-04-17 0.2 Fast compression modes made even faster * direct i/o to compression buffers * larger blocks to avoid disk trashing * MM tables disabled in -2/-3 modes Multi-threaded decompression, also with direct i/o Fast text compression modes 1t..4t using grzip * now 4x4 is 10x faster than lzturbo on ENWIK9! Win32 & Linux versions 2008-06-02 0.2a Fixed bug in Tornado On average, 4x4 is 18 times faster than lzturbo! Below are detailed results from http://www.metacompressor.com/uploads.aspx file1 - big text 1,552,758,784 mode size compression/decompression time 4x4 0.2 1t 354,958,849 24 29 lzturbo 0.92 -59 322,372,806 219 21 4x4 0.2 4t 311,810,707 41 36 4x4 0.2 9 300,944,001 117 20 * 4x4 is 5 times faster than lzturbo! file2 - windows 2008 server virtual disk 1,489,400,832 mode size compression/decompression time lzturbo 0.92 -59 352,723,630 1343 4x4 0.2 6 344,522,813 25 24 4x4 0.2 9 268,639,166 97 19 * 4x4 is 53 times faster than lzturbo!!! file3 - big apache log 2,072,612,014 mode size compression/decompression time lzturbo 0.92 -59 103,156,939 313 4x4 0.2 4t 80,941,237 24 28 * 4x4 is 13 times faster than lzturbo! file4 - enwik9 part wikipedia export 1,000,000,000 mode size compression/decompression time 4x4 0.2 1t 233,368,003 14 18 lzturbo 0.92 -59 232,701,587 155 14 4x4 0.2 4t 208,787,642 34 26 * 4x4 is 11 times faster than lzturbo! file6 - source code linux, apache, mysql, php and firefox 729,287,225 mode size compression/decompression time lzturbo 0.92 -59 156,185,652 109 4x4 0.2 1t 151,456,761 14 12 4x4 0.2 9 151,252,453 51 9 * 4x4 is 8 times faster than lzturbo! file7 - big db index 1,066,160,748 mode size compression/decompression time lzturbo 0.92 -59 406,358,090 4405 20 4x4 0.2 1t 390,897,470 35 34 4x4 0.2 9 359,413,561 145 13 * 4x4 is 125 times faster than lzturbo! no comments :)