Core Web Vitals: Why Website Performance Monitoring Matters?

LoadFocus
3 min readApr 16, 2021

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Core Web Vitals is a new initiative from Google designed to measure and improve user experience on the web.

Monitoring Core Web Vitals with LoadFocus
Monitoring Core Web Vitals with LoadFocus in the Cloud

Core Web Vitals’ focus is for a better user experience and the below metrics are the most important ones for providing a great user experience.

At the moment, there are three Core Web Vitals:
- Largest Contentful Paint (loading performance)
- Cumulative Layout Shift (visual stability)
- First Input Delay (interactivity)

Google’s thresholds for these 3 metrics are as follows.

Core Web Vitals metrics 2020 2021 focus
Core Web Vitals focus is: loading, interactivity, and visual stability

Largest Contentful Paint (LCP) measures how long it takes for the most meaningful content on your site to load:
Good — Less than or equal to 2.5 seconds
Needs Improvement — Less than or equal to 4.0 seconds
Poor — More than 4.0 seconds.

Cumulative Layout Shift (CLS) measures how much your site’s content “shifts” or “moves around” when it loads:
Good — Less than or equal to 0.1 seconds
Needs Improvement — Less than or equal to 0.25 seconds
Poor — More than 0.25 seconds.

First Input Delay (FID) is a responsiveness measurement and measures how long it takes for a page to respond after a user has interacted with it:
Good — Less than or equal to 100 ms
Needs Improvement — Less than or equal to 300 ms
Poor — More than 300 ms.

Monitor Core Web Vitals metrics
Monitor Core Web Vitals metrics

Core Web Vitals also Affect SEO and SEO results

This change will be in place starting with May 2021, this means that the Core Web Vitals metrics may affect your SEO performance.

Core Web Vitals metrics SEO performance
Core Web Vitals metrics may affect your SEO performance

How to Test & Measure Core Web Vitals

Using Website Performance Monitoring cloud service from LoadFocus you can test your website from 15+ world cloud locations on mobile and desktop devices and receive charts and insights for the Core Web Vitals metrics.

Website Performance Monitoring report from LoadFocus

Create a New Test

Choose the desired location, the URL of your website, the device and repeat period for your test.

Create your first test now.

New Website Performance Monitoring Test
New Website Performance Monitoring Test for Core Web Vitals from the Cloud

Monitor Core Web Vitals metrics for multiple pages and compare results

You can add multiple pages of your website and inspect the results using the reports and charts offered by LoadFocus.

Compare Core Web Vitals between multiple sites

List all your competitor and improve your site experience for your main user journeys.

Compare Core Web Vitals
https://speed.loadfocus.com/demo

Chrome Extension LoadFocus: Website Performance Monitoring

LoadFocus Website Performance Monitoring is powered by Lighthouse and focuses on modern user experience and performance metrics to help you deliver the best experience to your customers.
Chrome Extension LoadFocus: Website Performance Monitoring
Install LoadFocus: Website Performance Monitoring

Create your first test now.

Written by Bogdan Vazzolla.

LoadFocus is a cloud testing platform, a load and stress testing tool which provides the infrastructure to run tests with thousands of concurrent users, from multiple cloud locations, in less than a few minutes, keep history of the results, compare different runs to inspect performance improvements or performance degradation. It also supports running JMeter load tests from the cloud and monitoring and audit web and mobile performance.

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