a) RAR general compression algorithm is optimized for betterutilization of several processor cores. While some speed gainis possible even in single processor mode, best resultsare achieved in multi-core environment.
Speed gain depends on data type and average file size.Several cores are utilized more efficiently when compressinglarge files.
b) we had to increase memory requirements to achieve highercompression speed. General RAR compression algorithm allocatesabout 120 MB comparing to 40 MB in WinRAR 4.11;
c) RAR text compression algorithm cannot utilize several CPU coresefficiently, so its performance in multiprocessor environmentis much lower than for general algorithm. Also its decompressionspeed is much lower than in general algorithm regardless ofCPU number. So we decided to disable the text algorithm by default.
If you need maximum possible compression ratio for plain text dataregardless of speed, you can enable the text compressionin “Advanced compression parameter” dialog. Press “Compression…”button on “Advanced” page of archiving dialog to access it.You can also change this option permanently in default compressionprofile;
In the command line mode the text compression can be enabledwith -mct switch;
d) “Fastest” (-m1) compression mode also supports several processorcores now. In 4.11 it could use only a single processor core.
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