[lillecarl]

This depends, Hyprland has their own flake, and rather than overriding nixpkgs they recommend adding their cachix binary cache. You get binaries for Hyprland from Cachix and for it's dependencies from cache.nixos.org.

Works well for me. Though when doing configuration changes I usually pass --no-substitutes (or smth) to not query all my subs for derivations that'll never be in a remote cache.