This improves compression ratio but changes how much data has to be decompressed to get access to files. Solid block size sets how "far" data is analyzed between files in the archive. Raising this improves compression ratio but reduces compression speed, going above stock doesn't help very much on most files, just slows down compression. Word size sets the longest length of repeating data it looks for during compression. Never set this so that the amount of memory needed is more than is available! This mostly impacts how much memory is used, larger dictionaries improve compression ratio but greatly increase memory usage, especially for compression. Dictionary size is basically how much data is analyzed in memory while the file is compressed.
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