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Hellishly Slow Level 13 Deflate Compression
DEFLATE level 13 is a deliberately impractical libdeflate compression level: the output remains standard DEFLATE, while the encoder spends far more time searching parse, Huffman, and block split choices. On Silesia it saves 86'990 bytes, 0.134%, over level 12 and runs 56.4x slower; this cost is acceptable only when data is compressed once and distributed many times.
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