Chromium Blog: How Core Web Vitals saved users 10,000 years of waiting for web pages to load

By admin

Today’s The Fast and the Curious post explores how

Core Web Vitals
ORG

saved

Chrome
ORG

users

more than 10,000 Years
DATE

of waiting for web pages to load in

2023
DATE

(across

Chrome
ORG

desktop and

Android
ORG

) by quantifying the experience of sites and identifying opportunities to make improvements.

In

2020
DATE

, we introduced Web Vitals – essential quality signals for webpages to ensure a better user experience. Since then, there has been a massive leap in web performance made possible by our work on

Core Web Vitals
ORG

(

CWV
ORG

) and its broader impact on the web.

Today
DATE

,

over 40%
PERCENT

of sites pass all of the

CWV
ORG

metrics, leading to pages that load and respond to interactions more quickly. Here’s a closer look at the journey to help improve the performance for sites and some specific work done in the browser and the ecosystem to enable this achievement.


Chrome
ORG

‘s

Quest for Speed

WORK_OF_ART

The very essence of the web lies in its ability to provide information and services efficiently and rapidly. This principle is at the heart of

Google
ORG

‘s business and drives our work on

Chrome
ORG

. However, we noticed an issue with sites over a long time horizon. Even if slow sites improved their performance for a while, it would often decline over time. No matter how fast

Google Search
ORG

might be, the user experience would be subpar if the pages found were slow to load.

We could not help these sites improve their performance directly, but we wanted users to have a great experience when they moved from

Google Search
ORG

to the individual sites. To tackle the challenge of improving the user experience while simultaneously providing unified guidance to developers, teams from

Search
ORG

and

Chrome
ORG

collaborated to address the issue of slow web pages.

Defining the Fast Web

We examined

millions
CARDINAL

of pages to define a public standard for a fast, user-friendly web page (initially published in

The Science Behind Web Vitals
WORK_OF_ART

). We published our specifications and data to the open ecosystem and took note of the feedback we received. The introduction of

CWV
ORG

metrics such as

LCP
ORG

(Largest Contentful Paint) was groundbreaking because it allowed us to measure when the user actually sees the content. The ability to measure the actual user experience at scale has been foundational to the improvements that we will discuss in this blog post.

Next, we updated

Google
ORG

‘s search ranking algorithms in

August 2021
DATE

to consider, among other factors, whether a page met the speed and usability standards established as part of

CWV
ORG

.

Today
DATE

, it remains highly recommended for site owners to achieve good Core Web Vitals for success with

Search
ORG

and to ensure a great user experience generally.

Exponential Impact of Small Changes

The results we saw after these changes were significant. The average page load in

Chrome
ORG

is now

166 ms
QUANTITY

faster. That might seem like a minor improvement, but small changes can accumulate to create a substantial impact on the web.

So far in

2023
DATE

, this project saved users over

10,000 years
DATE

of waiting for web pages to load and over

1,200 years
DATE

of waiting for web pages to respond to user input. And the web continues to get faster. We also tracked improvements in how many navigations meet

Core Web Vitals
ORG

(

CWV
ORG

). The current figures stand at

64.45%
PERCENT

for mobile (up from

64%
PERCENT

) and

68.39%
PERCENT

for desktop (up from

67%
PERCENT

). The

Chrome Data
ORG

team projects a ~69% pass rate by

the end of the year
DATE

.

Caption: Our savings for

LCP
ORG

translate into

8,000 years
DATE

saved for users waiting for pages to load on

Android
ORG

and

2,000 years
DATE

in

2023
DATE

so far. On

INP
ORG

, we have saved users

800 years
DATE

on

Android
ORG

and

450 years
DATE

on

Windows
PRODUCT

so far in

2023
DATE

.