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Large Rust caches contain useful compiled dependencies. Default compression and unused toolchains from runner images increase storage.
Use Zstandard level
9for Rust caches. Keep the active workspace toolchain and remove unused toolchains before caching. Normalize defaultCARGO_HOMEandRUSTUP_HOMEvalues, and preserve custom paths.The recorded measurements show these reductions for the same Cargo registry, Git, and target payloads:
These three payloads save about 380 MiB. Compression adds 4–16 seconds when saving a new archive. The restored files stay unchanged.
Key normalization should also prevent the observed 748 MiB duplicate Windows CLI dependency archive across GitHub and Namespace runners. Existing archives remain until cleanup or eviction.