~/talk

How GZIP compression works

Talkat JSConf EU 2014 · 2014-09-13..09-14· [web-performance, databases]

speaker

name:Raul Fraile

links:none on file

resources

video:https://youtu.be/wLx5OGxOYUc

slides:none on file

summary

Explains that GZIP uses DEFLATE = LZ77 + Huffman, compresses data in blocks with three modes (no compression, fixed Huffman, dynamic Huffman), and uses a 32 KB sliding window for LZ77 matches. Compares implementations: GNU gzip vs 7‑Zip vs zopfli — zopfli spends ~100× more time to gain ~5%, so use offline precompression for deploys. Shows preprocessing wins: transposing JSON and ordering attributes can cut sizes (one experiment reports ~17%).

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