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Once received, the ZIP file would then be opened and its contents decompressed ("unzipped") onto a user's computer. It also allowed for multiple files and folders to be grouped together ("zipped") and transferred as a single ZIP file.
Using ZIP compression regularly saved minutes or even hours off of file transfers. In this era, file transfers occurred using MODEMs and transfer speeds were very limited. The ZIP file format dates to the late 1980s when it received heavy use in pre-internet-era Bulletin Board Systems, or BBSes. The ZIP file format is very popular for efficiently storing and transferring groups of files in a variety of business and personal applications. Options saved in "Advanced SFX options" dialog are ignored for these operations.ZIP files are compressed archives that group together one or more files into a single file, compressing the files (making them smaller) that are contained inside.
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If you create or update SFX archive, only SFX options stored in default compression profile are used. Options saved with this button are applied only to convert to SFX operation.
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RAR general decompression algorithm speed is slightly improved,.In 4.11 it could use only a single processor core. "Fastest" (-m1) compression mode also supports several processor cores now.In the command line mode the text compression can be enabled with -mct switch.You can also change this option permanently in default compression profile Press "Compression." button on "Advanced" page of archiving dialog to access it. If you need maximum possible compression ratio for plain text data regardless of speed, you can enable the text compression in "Advanced compression parameter" dialog.So we decided to disable the text algorithm by default. Also its decompression speed is much lower than in general algorithm regardless of CPU number. RAR text compression algorithm cannot utilize several CPU cores efficiently, so its performance in multiprocessor environment is much lower than for general algorithm.
General RAR compression algorithm allocates about 120 MB comparing to 40 MB in WinRAR 4.11 we had to increase memory requirements to achieve higher compression speed. Several cores are utilized more efficiently when compressing large files.