My linux config and rc files https://git.sommerfeld.dev/dotfiles/atom/dot_config/nix/registry.json?h=master 2026-05-13T12:43:40Z 2026-05-13T12:43:40Z sommerfeld sommerfeld@sommerfeld.dev 2026-05-13T12:43:40Z urn:sha1:26fc82ade8e6fde6858df1ed53bafa64719f2f15 - Drop auto-optimise-store: slows every build for modest disk savings. Run 'nix store optimise' manually if disk pressure ever shows up. - max-jobs=auto, cores=0: defaults are 1/1, which left most of the box idle during large closures (LLVM, protobuf, …). - Add nix-community.cachix.org as an extra substituter with its public key. Big hit-rate boost against nixos-unstable, which is what the new user registry points 'nixpkgs' at. - dot_config/nix/registry.json pins 'nixpkgs' indirect ref to github:NixOS/nixpkgs/nixos-unstable, so 'nix shell nixpkgs#foo' is fast + reproducible. Project flakes are unaffected — they pin their own inputs via flake.lock.