1 files changed, 31 insertions, 0 deletions
diff --git a/app/javascript/themes/glitch/util/performance.js b/app/javascript/themes/glitch/util/performance.js
new file mode 100644
index 000000000..450a90626
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+++ b/app/javascript/themes/glitch/util/performance.js
@@ -0,0 +1,31 @@
+//
+// Tools for performance debugging, only enabled in development mode.
+// Open up Chrome Dev Tools, then Timeline, then User Timing to see output.
+// Also see config/webpack/loaders/mark.js for the webpack loader marks.
+//
+
+let marky;
+
+if (process.env.NODE_ENV === 'development') {
+  if (typeof performance !== 'undefined' && performance.setResourceTimingBufferSize) {
+    // Increase Firefox's performance entry limit; otherwise it's capped to 150.
+    // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1331135
+    performance.setResourceTimingBufferSize(Infinity);
+  }
+  marky = require('marky');
+  // allows us to easily do e.g. ReactPerf.printWasted() while debugging
+  //window.ReactPerf = require('react-addons-perf');
+  //window.ReactPerf.start();
+}
+
+export function start(name) {
+  if (process.env.NODE_ENV === 'development') {
+    marky.mark(name);
+  }
+}
+
+export function stop(name) {
+  if (process.env.NODE_ENV === 'development') {
+    marky.stop(name);
+  }
+}