How to measure page load times using user timing API?
The time when all of the content in the visible viewport has been presented to the end-user as marked by the developer in their application. The time of the first user interaction with the page during or after a navigation action, such as scroll or click, as marked by the developer in their application.
How are resource timings related to network timing?
Resource timings are detailed network timing measurements regarding the loading of an application’s resources.
How many resource timing entries do I Need?
Although the browser is required to support at least 150 resource timing performance entries in its resource timing buffer, some applications may use more resources than that limit. To help the developer manage the buffer size, Resource Timing defines two methods that extend the Performance interface.
What are the properties of the resource timing API?
The interface’s properties create a resource loading timeline with high-resolution timestamps for network events such as redirect start and end times, fetch start, DNS lookup start and end times, response start and end times, etc.
Which is the latest version of the flexipage API?
In API version 48.0 and earlier, arrays are represented as value and array elements are formatted as a comma-separated list. Any FlexiPage retrieved using API version 49.0 or later uses valueList to represent component property array values, regardless of which API version was used to create the FlexiPage.
When to use the region field in flexipage?
If none of the properties are specified OR any of these three properties are missing, the region is unlocked. This field is available in API version 35.0 or later. Properties and name of the component instance. This field was removed in API version 49.0. In API version 49.0 and later, use the itemInstances field instead.
How to measure perceived load time in JavaScript?
In his speech he mentioned the following example as a means of measuring perceived page load time: var timing = performance.timing; var loadtime = timing.loadEventEnd – timing.navigationStart; alert (“Perceived time:”+loadtime);