diff --git a/lib/main.js b/lib/main.js
index efc2bf3..5afb8a3 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -42,6 +42,8 @@ function run() {
             // Catalina workaround https://github.com/NixOS/nix/issues/2925
             if (os_1.type() == "Darwin") {
                 child_process_1.execFileSync(`${__dirname}/create-darwin-volume.sh`, { stdio: 'inherit' });
+                // Disable spotlight indexing of /nix to speed up performance
+                yield exec.exec("sudo", ["mdutil", "-i", "off", "/nix"]);
             }
             // Needed due to multi-user being too defensive
             core.exportVariable('ALLOW_PREEXISTING_INSTALLATION', "1");
diff --git a/src/main.ts b/src/main.ts
index 3ab93fb..565186b 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -27,6 +27,9 @@ async function run() {
     // Catalina workaround https://github.com/NixOS/nix/issues/2925
     if (type() == "Darwin") {
       execFileSync(`${__dirname}/create-darwin-volume.sh`, { stdio: 'inherit' });
+
+      // Disable spotlight indexing of /nix to speed up performance
+      await exec.exec("sudo", ["mdutil", "-i", "off", "/nix"]);
     }
 
     // Needed due to multi-user being too defensive