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 :)

