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When you want better compression than zstd (at the cost of CPU time, both during compression and during decompression), use PPMD for natural language text or source code and use LZMA (xz) for other things.

[going from xz/lzma to zstd] yields a total ~0.8% increase in package size on all of our packages combined, but the decompression time for all packages saw a ~1300% speedup