24 documents tagged with “Metrics”
Metrics are the Metrics.
Metric: Third-Party Blocking Time (3PBT)
Metric: Third-Party JavaScript Blocking Time (3PBT). This is an internal PageSpeed.cz monitoring indicator that helps you focus on issues caused by third-party components, which can degrade the Interactions (INP) metric. (3PBT)
Cumulative Layout Shift (CLS) Metric: How to Find and Eliminate Unwanted Page Shifts
Do ads on a website push the text you’re reading out of view? Frustrated when content shifts just before you click and you end up clicking somewhere else by mistake?
Core Web Vitals
Core Web Vitals (CWV) is Google's essential set of metrics designed to reflect website loading speed and user experience. Let's explore which metrics it includes, why they matter, and how to measure them.
First Contentful Paint (FCP)
First Contentful Paint (FCP) is a metric that measures the time from the start of page load to the moment the browser renders the first piece of content on the page.
Interaction to Next Paint (INP) Metric: Tackling Slow Interactions
Google introduces a new metric, Interaction to Next Paint (INP). In March 2024, as part of the three most important Core Web Vitals metrics, it will replace First Input Delay (FID).
Largest Contentful Paint (LCP) Metric: A Guide to Faster Web Loading
The world of Largest Contentful Paint (LCP) metrics is like adrenaline-fueled auto racing—a constant race against the clock.
Lighthouse Performance Score (LPS)
Lighthouse Performance Score (LPS) is a synthetic metric used to evaluate the speed and performance of websites, provided by the Lighthouse tool. The score is calculated from a range of metrics that simulate a user loading the page and provides an evaluative view of content speed and accessibility.
PageSpeed.cz Score (SPS): How we measure web speed for users?
We present a single number that acts as a proxy metric for Core Web Vitals on mobile and desktop. We call it the PageSpeed.cz Score (SPS).
Total Blocking Time metric (TBT)
Total Blocking Time (TBT) is a web performance metric that indicates the total time during which the page is not able to respond to user input.
Time To First Byte (TTFB)
TTFB shows the speed of the server (or infrastructure), the backend parts of the application, and also the network speed between the server and the user’s browser.
How to Find the LCP Element
For optimizing LCP, it’s essential to be able to find the “LCP element,” which is the largest element in the browser’s viewport for a given user. The display time of this element determines the LCP metric.
LCP Metric Optimization
Let’s explore what problems with the Largest Contentful Paint (LCP) metric you may encounter and how to optimize the metric as efficiently as possible.
Cookie Banners and Website Speed
Is your site speed dialed in? Great, but you may not have deployed a cookie banner yet.
Chrome UX Report: Real-User Speed Data from Google
Chrome UX Report (CrUX) is a public data set provided by Google that collects and anonymously analyzes data about real user experience when browsing the web with the Chrome browser.
Web Compression with Gzip and Brotli: Are You Doing It Right?
In PageSpeed.cz we tackle very specific issues, and we’re often surprised by how deep we go. Data compression was no exception, and we’ll dive into it in this article.
Get Your HEAD in Order
We love WebExpo and performance. And we’re big fans of Harry Roberts, whose talks and articles always go in-depth.
CLS Metrics Optimization
Let’s take a look at how to avoid CLS problems and how to remove them when they occur.
INP Metric: 7 Tips for Optimization
INP isn’t the easiest metric to optimize, so we’ve drawn from our experience the most common problems and how to fix them.
Performance budgets (web speed limits)
Performance budgets is a methodology for keeping web page speed at the level we set. Think of a “budget” as a limit on values for different metrics.
Why Optimize Website Speed?
Psychology, conversions, and Google — why you should have a fast website too.
PageSpeed.cz Study: The Impact of Chat Widgets on Website Speed
Live chat is used by 20% of Czech e-commerce operators. But how do these widgets affect site speed?
Test: Is it better to have many small CSS files or one big one?
In the PageSpeed.cz team we have several evergreen discussions, and one of the perennial questions is: Is it faster to have many small CSS files split by components, or a single large file?
Types of Web Speed Measurement: Synthetic, Chrome UX Report, and Real User Monitoring
In this article, we clarify the differences between the various types of web speed measurement. We’ll discuss synthetic data (“synth”), data from Google users (“CrUX”), and data from all users (“RUM”).
Testing Web Vitals in the Browser (A Developer’s Key Skill)
Core Web Vitals are the metrics we use to evaluate website performance in areas such as loading speed, interactivity, and layout stability. These metrics are increasingly important for delivering a good user experience, and Google uses them as a ranking factor in search results.