To maximize the efficiency of your applications, capture detailed network performance metrics with the new UI Telemetry Timing events. Use the Resource Timing event log file type to measure how long a browser takes to load specific application resources from a remote server. Use the Navigation Timing event log file type to track metrics related to page navigation, such as how long a browser takes to construct a page’s Document Object Model (DOM).
Where: This change applies to Lightning Experience in Enterprise, Performance, Unlimited, and Developer editions where Event Monitoring is enabled. The events are available in the API and in the Event Log Browser, but not in the Event Monitoring Analytics app.
Who: This change is available to customers who purchased Salesforce Shield or Salesforce Event Monitoring add-on subscriptions.