diff --git a/app/assets/javascripts/discourse/public/assets/scripts/start-app.js b/app/assets/javascripts/discourse/public/assets/scripts/start-app.js
index 0ef18aff86e..3383ca92932 100644
--- a/app/assets/javascripts/discourse/public/assets/scripts/start-app.js
+++ b/app/assets/javascripts/discourse/public/assets/scripts/start-app.js
@@ -1,4 +1,5 @@
 document.addEventListener("discourse-booted", (e) => {
+  performance.mark("discourse-booted");
   const config = e.detail;
   const app = require(`${config.modulePrefix}/app`)["default"].create(config);
   app.start();