In a recent article, I described how to use Selenium and the Javascript Navigation API to quickly collect customized client-side performance metrics. In this article, I’ve covered the specifics of the most useful features as well as how to put up a NodeJS wrapper for the Webpage Test API and run a programmed test. WebPageTest …
As performance testers, we are often faced with the question of whether the data we provide is accurate. The most common question a performance tester encounters is the following after they have identified themselves using the supporting documentation for load testing tools. What is the browser page load time? Or, what is customer-perceived response time …
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Nowadays it is easy to check the responsiveness of a website in different geographical locations. It is essential for a company to periodically evaluate the performance of a system or website. Any organization’s website will rank higher in search engines like Google if it is run more efficiently, and faster pages will result in better …
The total block time is calculated as the sum of all long tasks (= long task processing time – 50ms) between the time the first piece of content is painted on the screen and the time the user interacts with the website. Describe a long task. The main thread task that takes more than 50 …
A very popular but non-standardized user interface metric called “Interaction Time” indicates when a website is ready for user interaction. “User interaction” in this context refers to the ability of a user to provide information in the form of clicking, selecting options, inserting text, etc. Let’s try to understand the definition in a practical way …
A UI performance test metric called the Speed Index (SI) measures how quickly the content of a web page is visually displayed to end users. The speed index is not, in fact, a time-based measure. The score represents how quickly the content of a web page loads. The performance of that web page improves with …
One of the crucial metrics in UI performance testing is the Largest Content Paint or LCP. Indicates the time when the main part of the web page has loaded and is available for user use. Also note that the LCP only tracks load times for elements that are critical to the user experience, such as …
First Meaningful Paint, or FMP, measures how long the main content of a website is visible. It is at this point that the end user can access the larger content of the website, giving the feeling of a significant change in design. Current fonts can also be loaded through First Meaningful Paint. First Contentful Paint, …
One of the crucial criteria in UI performance testing is First Contentful Paint or FCP. Indicates the time when the browser produces the first piece of content, such as a word or image, or a non-white canvas, among others. Initially, it gives the user the impression that the page is loading. Behind the idea of …
The term “first paint” refers to when the browser draws its first few pixels on the screen. In a nutshell, it describes the moment after a user navigates to a web page when the first pixel appears on a screen. The browser can display anything that is visually distinguishable from what was on the screen …
