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IFrames and Frames have their own JavaScript context, so it's not possible to access variables that are only available in another frame. DOM elements also must be available in a Frame/IFrame in which the RUM JavaScript is injected. These factors can lead to skewed metrics. Make sure youverify JavaScript variable or DOM element capturefor these elements.
There may be a definedsetTimeOutfor XHR callbacks. Make sure you'veenabled support for XHR (AJAX) frameworks, and that the specific XHRs haven't been excluded from monitoring.
Be aware that the Visually Complete module has no possibility to determine the render time of images that have beenpreloaded, since the listeners it would need to register are never called in such scenarios. This makes it impossible for the module to determine anything close to a render time of such images, so it either leverages mutation or resource load time. However, both of these metrics might be earlier than the actual render time of the image, especially if that image was preloaded and the page takes a long time to load.
