Slow flake rebuilds: diagnosing whether NixOS evaluation is the real bottleneck
A flake-based NixOS configuration that pulls in a large module set can spend a long stretch on nixos-rebuild before any derivation starts building. Nix evaluation is single-threaded, the entire configuration is re-evaluated on every rebuild, and wall-clock time blends evaluation, input fetching, and build planning into one number. The goal is to measure befo
nixos