We Built Domain-Specific Compression for Messages. Here's What We Learned.

Why gzip loses to custom compression on Discord, Slack, and chat data. Plus how we caught a decompression bug during validation. cover_image: canonical_url: https://github.com/atomsrkuul/glasik-notation We Built Domain-Specific Compression for Messages. Here's What We Learned. Generic compression algorithms (gzip, brotli, zstd) optimize for everything. We built compression that optimizes for messages. The result: 3.5× compression on real Discord, Slack, and OpenClaw traffic. 22-36% better than gzip. 100% lossless. Here's the honest engineering story—including the bug we caught during validation. The Problem Message data is everywhere: · Discord servers with millions of messages · Slack workspaces with gigabytes of history · OpenClaw chat logs and conversation archives · Email inboxes and chat backups Each message is ~500 bytes. At scale, that's expensive. Generic compression gets 2–3× ratio. That's good, but not good enough. Why? Messages are highly structured and repetitive: [2026-04-