Quick #nix PSA: do you run a binary cache?
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Quick #nix PSA: do you run a binary cache? Is WantMassQuery: 1 not in its nix-cache-info file?
If it's not in there, clients will take an extremely long time to query whether paths are present in your cache by trying them one by one serially. No, I don't know why this is the default. We probably should automatically set it on new caches when creating them.
For example, https://cache.nixos.org/nix-cache-info gets this right.
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