Link Check results for web.dev

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website screenshot of https://web.dev/articles/optimize-lcp

Last checked: April 10, 2025 16:49:49

Check URL: https://web.dev/articles/optimize-lcp

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Page Info

  • URL: https://web.dev/articles/optimize-lcp
  • Title: Optimize Largest Contentful Paint
  • Favicon: web.dev logo

Host Info

  • Domain: web.dev
  • Server: Google Frontend
  • Country: United States
  • IP: 216.239.32.27
  • ASN: 15169 (GOOGLE)

Technologies

  • Google Sign-in logo Google Sign-in
  • YouTube logo YouTube
  • Google Cloud logo Google Cloud
  • HSTS logo HSTS
  • Google Tag Manager logo Google Tag Manager
  • Google Cloud Trace logo Google Cloud Trace
  • Google Analytics logo Google Analytics
  • HTTP/3 logo HTTP/3

SSL Info

Statistics

  • Total Requests: 80
  • Total Transfer Size: 1.7 MB
  • Total Content Size: 4.15 MB
  • Domains: 8
  • IP Addresses: 7

Headers

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cache-control: no-cache, must-revalidate

content-encoding: gzip

content-length: 31714

content-security-policy: base-uri 'self'; object-src 'none'; script-src 'strict-dynamic' 'unsafe-inline' https: http: 'nonce-EU0R2Vsd0fuLOU7tXxwLkvMr1dj+O7' 'unsafe-eval'; report-uri https://csp.withgoogle.com/csp/devsite/v2

content-type: text/html; charset=utf-8

date: Thu, 10 Apr 2025 16:49:57 GMT

expires: 0

last-modified: Mon, 31 Mar 2025 07:00:00 GMT

pragma: no-cache

server: Google Frontend

strict-transport-security: max-age=63072000; includeSubdomains; preload

vary: Cookie Accept-Encoding

x-cloud-trace-context: 0d902fe675c6ade752c505f76ecd72c1

x-content-type-options: nosniff

x-frame-options: SAMEORIGIN

x-xss-protection: 0

Detailed Technologies

Name Category Description
Google Sign-in
Google Sign-in

Authentication

Google Sign-In is a secure authentication system that reduces the burden of login for users, by enabling them to sign in with their Google account.
YouTube
YouTube

Video players

YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.
Google Cloud
Google Cloud

IaaS

Google Cloud is a suite of cloud computing services.
HSTS
HSTS

Security

HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Google Tag Manager
Google Tag Manager

Tag managers

Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Google Cloud Trace
Google Cloud Trace

Performance

Google Cloud Trace is a distributed tracing system that collects latency data from applications and displays it in the Google Cloud Console.
Google Analytics
Google Analytics

Analytics

Google Analytics is a free web analytics service that tracks and reports website traffic.
HTTP/3
HTTP/3

Miscellaneous

HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.

Cookies

Name Value Domain Expires Attributes
_ga_64EQFFKSHW
GS1.1.1744303800.1.0.1744303800.0.0.0
.web.dev
5/15/2026, 4:50:00 PM
_ga
GA1.1.1634076044.1744303801
.web.dev
5/15/2026, 4:50:00 PM
django_language
en
web.dev
10/7/2025, 4:50:00 PM

External Links

Label URL
Learn more about how Google uses cookies. Opens in a new tab.Learn more
https://policies.google.com/technologies/cookies?hl=en
Philip Walton on XX
https://twitter.com/philwalton
Philip Walton on GitHubGitHub
https://github.com/philipwalton
Philip Walton on LinkedInLinkedIn
https://www.linkedin.com/in/waltonphilip
Philip Walton on MastodonMastodon
https://toot.cafe/@philipwalton
Philip Walton on BlueskyBluesky
https://bsky.app/profile/philipwalton.com
Philip Walton's homepageHomepage
https://philipwalton.com/
Barry Pollard on XX
https://twitter.com/tunetheweb
Barry Pollard on GitHubGitHub
https://github.com/tunetheweb
Barry Pollard on MastodonMastodon
https://webperf.social/@tunetheweb
Barry Pollard on BlueskyBluesky
https://bsky.app/profile/tunetheweb.com
Barry Pollard's homepageHomepage
https://www.tunetheweb.com
Lighthouse
https://developer.chrome.com/docs/lighthouse
Chrome User Experience Report (CrUX)
https://developer.chrome.com/docs/crux
live metrics view
https://developer.chrome.com/docs/devtools/performance/overview#live-metrics
Insights
https://developer.chrome.com/docs/devtools/performance/reference#insights
available in CrUX
https://developer.chrome.com/blog/crux-2025-02
A Deep Dive into Optimizing LCP
https://youtu.be/fWoI9DXmpdk
Chrome DevTools
https://developer.chrome.com/docs/devtools
WebPageTest
https://webpagetest.org/
network waterfall
https://developer.chrome.com/docs/devtools/network/reference
blocked
https://developer.chrome.com/docs/lighthouse/performance/render-blocking-resources
Remove unused CSS
https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules
transfer size
https://developer.mozilla.org/docs/Web/API/PerformanceResourceTiming/transferSize
Serve the optimal image size
https://developer.chrome.com/docs/lighthouse/performance/uses-responsive-images
Use modern image formats
https://developer.chrome.com/docs/lighthouse/performance/uses-webp-images
Compress images
https://developer.chrome.com/docs/lighthouse/performance/uses-optimized-images
efficient cache-control policy
https://developer.chrome.com/docs/lighthouse/performance/uses-long-cache-ttl
font-display
https://developer.mozilla.org/docs/Web/CSS/@font-face/font-display
always be visible during load
https://developer.chrome.com/docs/lighthouse/performance/font-display
data URL
https://developer.mozilla.org/docs/Web/HTTP/Basics_of_HTTP/Data_URIs
comes with caveats
https://calendar.perfplanet.com/2018/performance-anti-patterns-base64-encoding/
decode cost
https://www.catchpoint.com/blog/data-uri
shortened links
https://en.wikipedia.org/wiki/URL_shortening
Largest Contentful Paint API
https://w3c.github.io/largest-contentful-paint/
Navigation Timing API
https://www.w3.org/TR/navigation-timing-2/
Resource Timing API
https://www.w3.org/TR/resource-timing-2/
web-vitals library
https://github.com/GoogleChrome/web-vitals
Creative Commons Attribution 4.0 License
https://creativecommons.org/licenses/by/4.0/
Apache 2.0 License
https://www.apache.org/licenses/LICENSE-2.0
Google Developers Site Policies
https://developers.google.com/site-policies
File a bug
https://issuetracker.google.com/issues/new?component=1400680&template=1857359
See open issues
https://issuetracker.google.com/issues?q=status:open%20componentid:1400680&s=created_time:desc
Chrome for Developers
https://developer.chrome.com/
Chromium updates
https://blog.chromium.org/
@ChromiumDev on X
https://twitter.com/ChromiumDev
YouTube
https://www.youtube.com/user/ChromeDevelopers
Chrome for Developers on LinkedIn
https://www.linkedin.com/showcase/chrome-for-developers

Requested Domains

Domain Type Categories
developerprofiles-pa.googleapis.com
N/A
N/A
fonts.googleapis.com
N/A
N/A
fonts.gstatic.com
N/A
N/A
region1.google-analytics.com
N/A
N/A
web.dev
Apex domain
Technology, Technology
www.googletagmanager.com
N/A
N/A
www.gstatic.com
N/A
N/A
www.youtube.com
N/A
N/A

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