Ensure that Visually complete is the key performance metric used for XHR and load actions.
Confirm support for your browser. Speed index and Visually complete metrics are only available on browsers that supportmutation observers. The following browsers are supported:
Microsoft Internet Explorer 11
Microsoft Edge 15 or later
Firefox 57 or later
Google Chrome 61 or later
Safari is not supported because it does not support resource timings.
Check the JavaScript injection point. Visually complete and Speed index metrics can't be calculated if theRUM JavaScriptisn't inserted at a location within the HTML of your application pages where it can reliably get the mutation observer listeners in place. The RUM JavaScript execution occurring too late to get mutation observer listeners in place happens mainly when using Tag Manager. Known triggers that will stop Dynatrace RUM from capturing Visually complete timing measurements:
Interrupted by user: When your user interacted with your page during the initial Visually complete timing calculation and by that interrupted it.
Forced by user before load: When your user left the side before the browser fired the onload event.
Forced by user after load: When your user left your page after the browser fired the onload event but the Visually complete calculation has not yet started.
Hard timeout met: When the Visually complete timing calculation exceeded the hard timeout of 3 minutes.
