12/21/2023 0 Comments Timing benchmark definition![]() The Performance Timeline API is an extension of the Performance API. That’s why you’ll always hear that Performance API is a part of the High Resolution Time API. This precision makes it ideal for yielding accurate measurements of time.Ī high resolution time measured by User-Agent (UA) does not change with any changes in system time because it is taken from a global clock created by the UA.Įvery measurement measured in the Performance API is a high resolution time. High resolution timeĪ high resolution time is precise up to fractions of a millisecond.Ĭomparatively, time based on the Date is accurate only up to the millisecond. Let’s break down these terms to get a better understanding. ![]() You’ll encounter a confusing slew of terms such as High Resolution Time, Performance Timeline API, etc, whenever reading about the Performance API, which makes it hard to understand what exactly it is and how you can make use of it to measure web performance. “Performance API is part of the High Resolution Time API, but is enhanced by the Performance Timeline API, the Navigation Timing API, the User Timing API, and the Resource Timing API.” – MDN Now let’s talk about what these APIs are. We can get really precise timestamps, which makes the analysis of these performance metrics very accurate.But with the Performance APIs, we can get real user measurement (RUM) in production. Chrome dev tools and other tools like Lighthouse are only helpful during the development phase. ![]() These APIs augment experience when using performance profiling in dev tools.Now, the browser’s Performance API provides tools to accurately measure the performance of Web pages.īefore we dig into what these Performance APIs are, let’s look at some compelling reasons for why you should be using them. We’ve also been met with limitations in API browsers that obstructed us from accurately measuring performance.įortunately, this is starting to change thanks to new performance-oriented APIs. ![]() Historically we’ve had limited information regarding performance metrics on the client-side of performance monitoring. How to practically use Performance API to measure performance Ananya Neogi Follow A frontend developer focusing on creating digital products with a great user experience. ![]()
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