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---
synopsis: "`nix copy` is now several times faster at `querying info about /nix/store/...`"
cls: [1462]
issues: [fj#366]
credits: [jade]
category: Fixes
---
We fixed a locking bug that serialized `querying info about /nix/store/...`
onto just one thread such that it was eating `O(paths to copy * latency)` time
while setting up to copy paths to s3 and other stores. It is now `nproc` times
faster.
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