From 0e103b7e10692412d4e5da6a395e68c2488ff8a5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Moritz=20B=C3=B6hme?= <mail@moritzboeh.me>
Date: Wed, 22 Jan 2025 09:34:37 +0100
Subject: [PATCH] perf: make nix substitutions faster

---
 flake.nix                | 12 ++++--------
 modules/programs/nix.nix |  6 +++++-
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/flake.nix b/flake.nix
index a126049..3903317 100644
--- a/flake.nix
+++ b/flake.nix
@@ -215,18 +215,14 @@
 
   nixConfig = {
     extra-substituters = [
-      # "https://hyprland.cachix.org"
-      "https://nix-community.cachix.org"
-      "https://pre-commit-hooks.cachix.org"
-      "https://ghostty.cachix.org"
-      "https://cache.lix.systems"
+      "https://nix-community.cachix.org?priority=2"
+      "https://cache.lix.systems?priority=3"
+      "https://pre-commit-hooks.cachix.org?priority=4"
     ];
     extra-trusted-public-keys = [
-      # "hyprland.cachix.org-1:a7pgxzMz7+chwVL3/pzj6jIBMioiJM7ypFP8PwtkuGc="
       "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
-      "pre-commit-hooks.cachix.org-1:Pkk3Panw5AW24TOv6kz3PvLhlH8puAsJTBbOPmBo7Rc="
-      "ghostty.cachix.org-1:QB389yTa6gTyneehvqG58y0WnHjQOqgnA+wBnpWWxns="
       "cache.lix.systems:aBnZUw8zA7H35Cz2RyKFVs3H4PlGTLawyY5KRbvJR8o="
+      "pre-commit-hooks.cachix.org-1:Pkk3Panw5AW24TOv6kz3PvLhlH8puAsJTBbOPmBo7Rc="
     ];
   };
 }
diff --git a/modules/programs/nix.nix b/modules/programs/nix.nix
index 2dfc969..c390d32 100644
--- a/modules/programs/nix.nix
+++ b/modules/programs/nix.nix
@@ -68,13 +68,17 @@ in
 
       settings = {
         substituters = [
-          "https://cache.nixos.org/"
+          "https://cache.nixos.org?priority=1"
         ];
         trusted-public-keys = [
           "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
         ];
 
         trusted-users = [ "root" "@wheel" ];
+
+        # https://bmcgee.ie/posts/2023/12/til-how-to-optimise-substitutions-in-nix/
+        http-connections = 128;
+        max-substitution-jobs = 128;
       };
     };
   };