Marfeel captures a host of page speed metrics to allow you to accurately assess the performance of your site, some of which (LCP, INP, CLS) determine your website’s Core Web Vitals. Collectively, these metrics have a direct impact on user experience and therefore on how Google evaluates and ranks your site, so it is in your best interest to monitor them carefully and take steps to improve them where necessary.
Marfeel uses Real User Monitoring (RUM) to gather this data. Some of it is sourced from Mozilla’s Performance API.
Metrics
LCP - Largest Contentful Paint
LCP represents the time it takes for a page’s largest image or text block to render relative to when the page first loads. A good LCP score is under 2.5 seconds. Visit our documentation to learn more about LCP.
CLS - Cumulative Layout Shift
CLS represents the amount by which an element that is visible within the viewport changes its position unexpectedly. An example of undesirable layout shift would be when a user is about to click on a button, but suddenly that button moves because an ad loaded right above it, causing the user to click on the ad instead. A good CLS score is less than 0.1. Visit our documentation to learn more about CLS.
FID - First Input Delay
FID represents the time between when a user attempts to interact with a page and when the browser starts processing event handlers in response to the request. A good FID score is under 100 ms. Visit ourt documentation to learn more about FID.
INP - Interactive to Next Paint
INP measures the time from when a user clicks or types on a page until the page is next able to update. It measures the slowest action on the page. A good INP score is less than 200 ms. Visit our documentation to learn more about INP.
TBT - Total Blocking Time
TBT measures the total amount of time after First Contentful Paint (FCP) where the main thread was blocked for long enough to prevent input responsiveness. A good TBT score is less than 200 ms. Visit our documentation to learn more about TBT.
TTFB - Time to First Byte
TTFB represents the time between the request for a resource and when the first byte of a response begins to arrive. A good TTFB score is under 800 ms. Visit our documentation to learn more about TTFB.
Dom Content Loaded Time
The DOM (Document Object Model) Content Loaded Time measures when all the nodes in the page have been constructed in the DOM tree without waiting for images and CSS to finish loading. Visit our documentation to learn more about DOM Content Loaded.
Onload event
Onload events are DOM lifecycle events that captures when an object has been loaded. Onload is most often used within the element to execute a script once a web page has completely loaded all content such as images and iframes. Visit our documentation to learn more about Onload event.
To view a comprehensive list of all of Marfeel’s Metrics and Dimensions, visit our Glossary.