Core Web Vitals Visualizer
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Visualize the Core Web Vitals of any webpage

RUM Visualizer visualizes the Core Web Vitals for any webpage. This extension will visualize the Core Web Vitals for any webpage. It includes the Largest Contentful Paint (LCP), First Input Delay (FID), Cumulative layout Shift (CLS), First Contentful Paint (FCP), Interaction to Next Paint (INP) and the Time To First Byte (TTFB). Get direct access to the Core Web Vitals historical data! Features: LCP - Get LCP RUM values - Visualize the LCP. - Break down the LCP into Time to first byte, Resource load delay, Resource load time and Element render delay INP - Get INP RUM values - Visualize the INP. - INP breakdown CLS - Get CLS RUM values - Show CLS breakdown - Visualize the CLS - Animate the CLS. FCP - Get FCP RUM values - break down the FCP TTFB - get TTFB RUM values - breakdown the TTFB Easy debugging: - Emulate slow network conditions (3g). - Enable or disable Caching for the current page. changes: 1.11 Removed the FID, the Web Vitals are now based upon the upcoming v4 of the web vitals library, new breakdown details, improved CSS visualization, small bugfixes, code cleanup. 1.10 Promote INP to a Core Web Vitals and demote FID to a metric of interest! 1.9 CrUX history API, small fixes, more CLS info 1.8 Better metric updates, better logging, minor improvements 1.7 Log Events, Long Tasks and Long Animation Frames to the console that happen during and might interfere with the INP. 1.6 Better INP Breakdown, minor code improvements. 1.5 code improvements, layout improvements, added page experiments (defer javascript, disable javascript, disable third party scripts, lazy load images, defer background images & disable webfonts). 1.4 left side menu, more information about render blocking resources and direct links to PSI, CrUX dashboard and W3C. 1.2 added lots of LCP information like preloading, fetchpriority, rendering breakdown, first or third party etc.

5 out of 510 ratings

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Mohammad Hossein DoroudFeb 6, 2024

Excellent tool for debugging Web Vitals issues :))

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Charles MeadenMar 2, 2023

My new favourite tool to look at Core Web Vitals scores

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Hans StoopOct 30, 2022

Great tool to visualize the Core Web Vitals


  • Version
  • Updated
    May 7, 2024
  • Offered by
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  • Developer
    KRL Media
    Stationsplein 11 Bergen op Zoom 4611 BX NL
  • Trader
    This developer has identified itself as a trader per the definition from the European Union.


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  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes


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