diff --git a/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js b/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
index 4c477cb..c62daf9 100644
--- a/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
+++ b/polygerrit-ui/app/elements/core/gr-reporting/gr-reporting.js
@@ -142,21 +142,6 @@
   };
   catchErrors();
 
-  // PerformanceObserver interface is a browser API.
-  if (PerformanceObserver) {
-    const catchLongJsTasks = new PerformanceObserver(list => {
-      for (const task of list.getEntries()) {
-        // We are interested in longtask longer than 200 ms (default is 50 ms)
-        if (task.duration > 200) {
-          GrReporting.prototype.reporter(TIMING.TYPE,
-              TIMING.CATEGORY_UI_LATENCY, `Task ${task.name}`,
-              Math.round(task.duration), false);
-        }
-      }
-    });
-    catchLongJsTasks.observe({entryTypes: ['longtask']});
-  }
-
   // The Polymer pass of JSCompiler requires this to be reassignable
   // eslint-disable-next-line prefer-const
   let GrReporting = Polymer({