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by injinj
1675 days ago
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I believe libpng default zlib compression level is 6. libpng may use CRC (or adler) checksums, which account for around 30% of the decode time. In my experience with zlib, the higher compression levels have faster decode times. My reasoning at the time was (early '00s) that higher compression tends to code longer runs of copying of the dictionary. More time in the copy loop rather than the input and decode loop. |
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