Skip to content
Audit Complete

Results for https://ucla.edu

Visit site
Spain Spain · Madrid Completed: Apr 21, 2026 18:58 UTC
Download JSON Download Markdown Report

Mobile 375 × 812

Screenshot of the audited page (Mobile 375×812)

Desktop 1440 × 900

Screenshot of the audited page (Desktop 1440×900)
C72

Site Health

Score: 72 / 100

Based on 8 categories, 0 sections

Decent speed, but optimizing further could improve engagement.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Well-optimized for search — your content is discoverable.

Solid infrastructure — fast server responses across the board.

Strong compliance posture across regulations.

Good content signals with minor gaps.

Heavier than average — reducing page weight saves energy and bandwidth.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Amazon ELB · 172 peers
You 72
·
Avg 70
At average
0 50 100
Better than 63% of Amazon ELB sites See full Amazon ELB benchmark →
Bulma · 346 peers
You 72
·
Avg 74
At average
0 50 100
Better than 21% of Bulma sites See full Bulma benchmark →

Top Priorities (5)

1

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers
2

HSTS header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers
3

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy
4

Page weighs 9.1 MB (8.1 MB transferred)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget
5

1 control(s) without accessible label

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Form Accessibility
View fix priority matrix

Fix Priority Matrix

5 findings

Quick Wins

3

High impact, low effort — start here.

Strategic

2

High impact, requires investment.

Easy Improvements

0

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

0

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →
BeaverCheck badge
Embed this badge
[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fucla.edu)](https://beavercheck.com/results/3a802788-2f11-4e89-90fa-dbfdc9b40106)
<a href="https://beavercheck.com/results/3a802788-2f11-4e89-90fa-dbfdc9b40106"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fucla.edu" alt="BeaverCheck Score"></a>
https://beavercheck.com/badge?url=https%3A%2F%2Fucla.edu

This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 12.5s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. The 3 security gaps leave your users exposed — modern browsers increasingly warn visitors about insecure sites. Addressing the critical issues below would have the most immediate impact on your user trust.

3 security gaps detected — browsers may warn visitors about your site.
Your LCP is 12.5s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.
1 accessibility issue excludes users who rely on assistive technology.

Conversion Barriers

1 critical 7 warning

8 barrier(s) likely increasing bounce by ~27%.

Speed (2)

Page takes 12.5s to load

+12% bounce

Users abandon at ~3s — you're 10.0s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

High main-thread blocking time

+2% bounce

Page is non-interactive for 262ms after first paint

Fix: Defer third-party scripts and split large bundles

Trust (2)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Usability (1)

1 form field(s) without a label

+2% bounce

Screen readers skip unlabeled fields; autofill can't identify them; checkout abandonment spikes

Fix: Associate every input with a visible <label for="…">; add autocomplete attributes

Content (2)

No structured data

+2% bounce

No rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices

Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)

Content is hard to read

+2% bounce

Graduate-level reading difficulty — limits the addressable audience for product or blog pages

Fix: Shorten sentences; replace jargon with plain language; target Flesch ease ≥60

Navigation (1)

1 broken link(s) on the page

+2% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

$500 investment → $2,642/month returns + USD 157,500 risk avoided

Payback period: < 1 month First-year ROI: +6240%

Investment

$500

5h · 5 findings

Monthly returns

$2,642 /mo

~$31,699 / year

  • Conversions recovered $2,640
  • Bandwidth savings $2.04

Regulatory risk avoided

USD 157,500

if kept compliant

  • ADA Title III USD 150,000
  • CCPA/CPRA USD 7,500

Payback period

0 12mo 24mo

$150 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

$500

5.0 developer hours at $100/hr

Based on United States rates ($100/hr)

Quick wins
$150 3 fixes in ~90 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions
$ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

$13,127 / month at risk

~$157,524 / year if left unfixed

Compliance Risk

$157,500

ADA Title IIICCPA/CPRA
  • No privacy policy link detected
    CCPA/CPRA: USD 2,500 – USD 7,500
  • Trackers detected but no cookie policy found
    CCPA/CPRA: USD 2,500 – USD 7,500
  • Trackers detected but no privacy policy found
    CCPA/CPRA: USD 2,500 – USD 7,500

+3 more

Bandwidth Waste

$2.04 /mo

25486.8 MB/mo × 0.080 USD/GB

  • Optimize transfer: save ~2.5 MB per page load
    Saves $2.04/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Unique monthly visitors from your analytics

Purchases, signups, or key actions

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue
Current bounce (est.)
After fixes (est.)
Estimated bounce reduction

Fix 5 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

Was this report useful?

Thanks for your feedback!

We'll use a cached audit if available, or offer to scan.

Checking for existing audit...

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

50
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
88
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.85 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

12.54 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

262 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

14.32 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

30.53 s

Detailed Report

Audit breakdown by category with detailed findings.

50

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
www.ucla.edu/css/app.css?ver=0606250.0 ms403.1 KiB
www.ucla.edu/img/vote/rpp.jpg0.0 ms367.4 KiB
www.ucla.edu/img-feed-cache/Earth2520Month2520collage2520border.jpg0.0 ms322.3 KiB
www.ucla.edu/img-feed-cache/AAHM26.jpg0.0 ms311.0 KiB
www.ucla.edu/img-feed-cache/WBB.jpg0.0 ms284.8 KiB
www.ucla.edu/img/vote/rpp2.jpg0.0 ms267.4 KiB
www.ucla.edu/img-feed-cache/Edg2e_mid.jpg0.0 ms163.0 KiB
/img-feed-cache/Monkey252Bwith252BCoke-iStock-Mangkelin_9...0.0 ms156.6 KiB
www.ucla.edu/img-feed-cache/Team_mid.jpg0.0 ms145.2 KiB
www.ucla.edu/img-feed-cache/John252BMcDonald-Homeless_mid.jpg0.0 ms142.9 KiB
/v/t51.82787-15/660840206_18581701420034310_5883278954012...1209600.0 s1.3 MiB
cdn.webcomponents.ucla.edu/1.0.0-beta.15/css/ucla-lib.min.css0.0 ms127.3 KiB
www.ucla.edu/img/nav-cta-about-janns.png0.0 ms115.2 KiB
/webcomponents.ucla.edu/img/icons/social/instagram--brand...0.0 ms114.7 KiB
www.ucla.edu/js/vendor/jquery.min.js0.0 ms87.8 KiB
www.ucla.edu/js/main.js?ver=1212220.0 ms81.1 KiB
www.ucla.edu/img-feed-cache/Chancellor-Frenk.jpg0.0 ms62.3 KiB
/webcomponents.ucla.edu/public/1.0.0-beta.15/js/ucla-lib-...0.0 ms43.5 KiB
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...86400.0 s104.5 KiB
/v/t51.82787-15/660738210_18582033535034310_4074164048281...1209600.0 s376.0 KiB
/v/t51.82787-15/663151493_18582378613034310_7410689629823...1209600.0 s323.5 KiB
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...86400.0 s75.2 KiB
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...86400.0 s74.1 KiB
/v/t51.82787-15/659026738_18582390538034310_3581111324713...1209600.0 s268.6 KiB
www.ucla.edu/js/vendor/masonry.pkgd.min.js0.0 ms23.9 KiB
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...86400.0 s59.1 KiB
/v/t39.30808-6/663399630_956110183474691_2992011125068620...1209600.0 s200.1 KiB
/v/t39.30808-6/660479949_1513680927429715_865103899602011...1209600.0 s128.5 KiB
/v/t51.82787-15/657575844_18576709645042279_3271741934870...1209600.0 s124.7 KiB
/v/t51.82787-15/658785695_18581474719034310_5955129179846...1209600.0 s123.1 KiB
/v/t39.30808-6/665964626_957008790051497_6306279548422768...1209600.0 s118.6 KiB
/v/t51.82787-15/657320102_18576829036019037_4445581107452...1209600.0 s114.0 KiB
/v/t51.82787-15/658972993_18052840697719023_2170071156141...1209600.0 s110.6 KiB
/v/t39.30808-6/669195099_1495380761950764_838755299728204...1209600.0 s97.0 KiB
/v/t51.82787-15/658854407_18576954196060907_6931333870608...1209600.0 s96.4 KiB
www.ucla.edu/js/vendor/lazyload.min.js0.0 ms9.0 KiB
/v/t39.30808-6/661096014_1555450169272176_591989056633842...1209600.0 s82.0 KiB
/v/t39.30808-6/660099376_1544369697699339_549002620574311...1209600.0 s73.5 KiB
/v/t51.82787-15/658872626_18579190690042279_5683009541843...1209600.0 s65.9 KiB
/v/t51.82787-15/660141685_18574648339042508_7192986805867...1209600.0 s60.7 KiB
/v/t15.5256-10/665862413_1475356431001196_583915338208962...1209600.0 s60.4 KiB
/v/t51.82787-15/661470449_18578756353042279_9023517805759...1209600.0 s59.6 KiB
www.ucla.edu/js/vendor/smooth-scroll.min.js0.0 ms5.7 KiB
/v/t15.5256-10/665289092_761709840208833_7194136997659946...1209600.0 s51.9 KiB
www.ucla.edu/js/vendor/jquery.hideseek.min.js0.0 ms4.8 KiB
/v/t15.5256-10/664761975_701084889731410_5758363509883385...1209600.0 s46.4 KiB
/v/t39.30808-6/666703314_1515036186650170_138077008921748...1209600.0 s42.0 KiB
www.ucla.edu/js/vendor/stupidtable.min.js0.0 ms3.7 KiB
cse.google.com/cse.js?cx=007055646345973409059:8hr0gvmjar80.0 ms3.6 KiB
/v/t51.82787-10/657578392_18578710816042279_6031882207949...1209600.0 s36.5 KiB
/v/t51.82787-10/659804732_18579387577042279_8588416190070...1209600.0 s32.9 KiB
www.ucla.edu/js/vendor/jquery.scrollTo.min.js0.0 ms2.7 KiB
/webcomponents.ucla.edu/img/icons/social/tiktok--brand.svg0.0 ms2.5 KiB
/v/t51.71878-10/658444426_1484419906733647_97086042958057...1209600.0 s25.0 KiB
/webcomponents.ucla.edu/img/icons/social/threads--brand.svg0.0 ms2.3 KiB
www.ucla.edu/img/events/time-icon.svg0.0 ms2.2 KiB
www.ucla.edu/img/events/location-icon.svg0.0 ms2.1 KiB
www.ucla.edu/img/ucla_social_profile.png0.0 ms1.7 KiB
www.ucla.edu/img/logo_UCLA_white.svg0.0 ms1.5 KiB
www.ucla.edu/img/search-icon-666.svg0.0 ms1.4 KiB
www.ucla.edu/img/logo-ucla.svg0.0 ms1.3 KiB
/webcomponents.ucla.edu/img/icons/social/youtube--brand.svg0.0 ms1.3 KiB
/webcomponents.ucla.edu/img/icons/social/facebook--brand.svg0.0 ms1.3 KiB
/webcomponents.ucla.edu/img/icons/social/linkedin--brand.svg0.0 ms1.2 KiB
www.ucla.edu/img/external-link--defaultblue.svg0.0 ms1.1 KiB
www.ucla.edu/img/external-link--white.svg0.0 ms1.1 KiB
www.ucla.edu/img/left-arrow--blue.svg0.0 ms1.1 KiB
www.google.com/cse/static/style/look/v6/default.css3000.0 s1.2 KiB
www.ucla.edu/img/loading.svg0.0 ms1005 B
s3.us-west-1.amazonaws.com/webcomponents.ucla.edu/img/icons/social/x--brand.svg0.0 ms846 B
www.ucla.edu/img/arrow-down.svg0.0 ms841 B
www.ucla.edu/img/arrow-next.svg0.0 ms635 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Earth Month collage with red sunset skyline, elephant mom an baby, hillside tra… div.col > div.box-wrap > a.box-1__link > img.box-1__img
www.ucla.edu/img-feed-cache/Earth2520Month2520collage2520border.jpg321.6 KiB277.6 KiB
From left: Susanna Sedrak; Her Royal Highness Princess Ghida Talal; His Majesty… div.col > div.box-wrap--2 > a.box-3__link > img.box-3__img
www.ucla.edu/img-feed-cache/AAHM26.jpg310.3 KiB277.2 KiB
The women&#039;s basketball team proudly celebrates their championship trophy, … div.col > div.box-wrap--2 > a.box-2__link > img.box-2__img
www.ucla.edu/img-feed-cache/WBB.jpg284.1 KiB253.8 KiB
Close up of a woman's face working in a lab div.ucla > div.col > a > img.mobile
www.ucla.edu/img/vote/rpp2.jpg266.8 KiB208.2 KiB
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
/v/t51.82787-15/659026738_18582390538034310_3581111324713...268.5 KiB175.1 KiB
Diagram showing detailed look at changes in the Earth's surface texture li#featured-slider-slide01 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/Edg2e_mid.jpg162.4 KiB115.5 KiB
A macaque enjoys a carbonated drink div.story__featured > article.story__featured-card > a > img.story__featured-image
/img-feed-cache/Monkey252Bwith252BCoke-iStock-Mangkelin_9...156.1 KiB111.6 KiB
Six women in black T-shirts and jeans stand in front of a UCLA step-and-repeat … li#featured-slider-slide03 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/Team_mid.jpg144.7 KiB97.7 KiB
Students studying at a desk in a classroom li#featured-slider-slide02 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/John252BMcDonald-Homeless_mid.jpg142.5 KiB96.0 KiB
Will Gasparino article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...104.0 KiB91.1 KiB
Jann's Steps ul.primary-nav__menu-stack > li.menu-image-item > a.stack-img-link > img
www.ucla.edu/img/nav-cta-about-janns.png114.7 KiB81.9 KiB
Jordan Woolery div.story__featured > article.story__featured-card > a.img-link > img.story__featured-image
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...74.7 KiB65.0 KiB
Aadarsh Tripathi article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...73.6 KiB64.4 KiB
Jolyn Valeros article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...58.6 KiB51.3 KiB
Chancellor Julio Frenk Headshot section#quote > div.block-quote > figure.block-quote__img-wrapper > img
www.ucla.edu/img-feed-cache/Chancellor-Frenk.jpg61.9 KiB29.7 KiB
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
/v/t39.30808-6/669195099_1495380761950764_838755299728204...96.7 KiB21.0 KiB
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
/v/t15.5256-10/665862413_1475356431001196_583915338208962...60.1 KiB12.6 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: Earth Month collage with red sunset skyline, elephant mom an baby, hillside tra…
path: 1,HTML,1,BODY,6,MAIN,1,SECTION,0,DIV,0,DIV,1,DIV,0,A,0,IMG
selector: div.col > div.box-wrap > a.box-1__link > img.box-1__img
snippet: <img class="box-1__img" src="/img-feed-cache/Earth2520Month2520collage2520border.jpg" alt="Earth Month collage with red sunset skyline, elephant mom an baby, hillsid…">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 905 ms
URLTime Spent
ucla.edu/905 ms
www.ucla.edu/0.0 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 500 ms 109.5 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.5 s 500.7 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation1.1 s
Other991 ms
Style & Layout373 ms
Script Parsing & Compilation294 ms
Parse HTML & CSS84 ms
Rendering82 ms

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 32.6 KiB
URLTransfer SizeEst Savings
www.ucla.edu/js/main.js?ver=12122280.6 KiB32.6 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
The women&#039;s basketball team proudly celebrates their championship trophy, … div.col > div.box-wrap--2 > a.box-2__link > img.box-2__img
www.ucla.edu/img-feed-cache/WBB.jpg
From left: Susanna Sedrak; Her Royal Highness Princess Ghida Talal; His Majesty… div.col > div.box-wrap--2 > a.box-3__link > img.box-3__img
www.ucla.edu/img-feed-cache/AAHM26.jpg
Jordan Woolery div.story__featured > article.story__featured-card > a.img-link > img.story__featured-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...
Will Gasparino article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...
Jolyn Valeros article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...
Aadarsh Tripathi article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052537695
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052532147
Earth Month collage with red sunset skyline, elephant mom an baby, hillside tra… div.col > div.box-wrap > a.box-1__link > img.box-1__img
www.ucla.edu/img-feed-cache/Earth2520Month2520collage2520border.jpg
A macaque enjoys a carbonated drink div.story__featured > article.story__featured-card > a > img.story__featured-image
/img-feed-cache/Monkey252Bwith252BCoke-iStock-Mangkelin_9...
Diagram showing detailed look at changes in the Earth's surface texture li#featured-slider-slide01 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/Edg2e_mid.jpg
Students studying at a desk in a classroom li#featured-slider-slide02 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/John252BMcDonald-Homeless_mid.jpg
Six women in black T-shirts and jeans stand in front of a UCLA step-and-repeat … li#featured-slider-slide03 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/Team_mid.jpg
Chancellor Julio Frenk Headshot section#quote > div.block-quote > figure.block-quote__img-wrapper > img
www.ucla.edu/img-feed-cache/Chancellor-Frenk.jpg
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052611287
Close up of a woman's face working in a lab div.ucla > div.col > a > img.mobile
www.ucla.edu/img/vote/rpp2.jpg
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052621446
Jann's Steps ul.primary-nav__menu-stack > li.menu-image-item > a.stack-img-link > img
www.ucla.edu/img/nav-cta-about-janns.png
UCLA Logo div#header-wrap > div.university-logo > a > img
www.ucla.edu/img/logo-ucla.svg
UCLA div.has-background-ucla-blue > div.ucla > div.department > img.department__logo
www.ucla.edu/img/logo_UCLA_white.svg
UCLA a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
UCLA a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
ucla a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
instagram div.social-block__content > a.social-block__link > div.social-block__container > img.social-block__logo
/webcomponents.ucla.edu/img/icons/social/instagram--brand...
ucla a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
instagram div.social-block__content > a.social-block__link > div.social-block__container > img.social-block__logo
/webcomponents.ucla.edu/img/icons/social/instagram--brand...
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

Layout shift culprits
Optimize DOM size
Font display
Forced reflow
LCP breakdown
Optimize viewport for mobile
User Timing marks and measures 5 user timings
Avoid long main-thread tasks 9 long tasks found
Page didn't prevent back/forward cache restoration
Network Requests
Network Round Trip Times 160 ms
Server Backend Latencies 210 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 20 ms
INP breakdown
Avoid non-composited animations
Avoid large layout shifts
87

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Contact div.ucla > nav.li-links > div.li-links__container > h4.li-links__header

These are opportunities to improve keyboard navigation in your application.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Martin, Gasparino Power No. 1 UCLA to 5-… UCLA Gymnastics Adds Jolyn Valeros t… div#athletics-slider > div.splide__slider > div#athletics-slider-track > ul#athletics-slider-list

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Names and labels

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
All Baseball Cross Country Football General Gymnastics Men's Basketball Men's G… main#main-content > section.athletics > div.ucla > select#athleticsDropdown

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Go to slide 1 div#athletics-slider > ul.splide__pagination > li > button.splide__pagination__page
Go to slide 2 div#athletics-slider > ul.splide__pagination > li > button.splide__pagination__page
Go to slide 3 div#athletics-slider > ul.splide__pagination > li > button.splide__pagination__page
Go to slide 4 div#athletics-slider > ul.splide__pagination > li > button.splide__pagination__page

These items highlight common accessibility best practices.

Interactive controls are keyboard focusable
Interactive elements indicate their purpose and state
The page has a logical tab order
Visual order on the page follows DOM order
User focus is not accidentally trapped in a region
The user's focus is directed to new content added to the page
HTML5 landmark elements are used to improve navigation
Offscreen content is hidden from assistive technology
Custom controls have associated labels
Custom controls have ARIA roles
`[aria-*]` attributes match their roles
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s have all required `[aria-*]` attributes
`[role]` values are valid
`[aria-*]` attributes have valid values
`[aria-*]` attributes are valid and not misspelled
Buttons have an accessible name
Image elements have `[alt]` attributes
Form elements have associated labels
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
ARIA attributes are used as specified for the element's role
`[aria-hidden="true"]` elements do not contain focusable descendents
Elements use only permitted ARIA attributes
Background and foreground colors have a sufficient contrast ratio
Document has a `<title>` element
`<html>` element has a `[lang]` attribute
`<html>` element has a valid value for its `[lang]` attribute
Links are distinguishable without relying on color.
Links have a discernible name
List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
No element has a `[tabindex]` value greater than 0
Skip links are focusable.
Document has a main landmark.
Deprecated ARIA roles were not used
No form fields have multiple labels
Uses ARIA roles only on compatible elements
Identical links have the same purpose.
`[accesskey]` values are unique
`button`, `link`, and `menuitem` elements have accessible names
Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
ARIA input fields have accessible names
ARIA `meter` elements have accessible names
ARIA `progressbar` elements have accessible names
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[role]`s are contained by their required parent element
Elements with the `role=text` attribute do not have focusable descendents.
ARIA toggle fields have accessible names
ARIA `tooltip` elements have accessible names
ARIA `treeitem` elements have accessible names
The page contains a heading, skip link, or landmark region
`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Definition list items are wrapped in `<dl>` elements
ARIA IDs are unique
`<frame>` or `<iframe>` elements have a title
`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
Input buttons have discernible text.
`<input type="image">` elements have `[alt]` text
The document does not use `<meta http-equiv="refresh">`
`<object>` elements have alternate text
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
`[lang]` attributes have a valid value
`<video>` elements contain a `<track>` element with `[kind="captions"]`
Tables have different content in the summary attribute and `<caption>`.
All heading elements contain content.
Image elements do not have `[alt]` attributes that are redundant text.
Elements with visible text labels have matching accessible names.
Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
`<td>` elements in a large `<table>` have one or more table headers.
88

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
Will Gasparino article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...376 x 243 (1.55)2000 x 1125 (1.78)
Jolyn Valeros article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...376 x 243 (1.55)2000 x 1125 (1.78)
Aadarsh Tripathi article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...376 x 243 (1.55)2000 x 1125 (1.78)

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
Failed to load resource: the server responded with a status of 403 ()

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Issue type
Content security policy
Uses HTTPS
Avoids deprecated APIs
Avoids third-party cookies
Allows users to paste into input fields
Avoids requesting the geolocation permission on page load
Avoids requesting the notification permission on page load
Serves images with appropriate resolution
Page has the HTML doctype
Properly defines charset
Ensure CSP is effective against XSS attacks
Use a strong HSTS policy
Ensure proper origin isolation with COOP
Mitigate DOM-based XSS with Trusted Types
Detected JavaScript libraries
Page has valid source maps
Redirects HTTP traffic to HTTPS
Mitigate clickjacking with XFO or CSP
100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Structured data is valid
Page isn’t blocked from indexing
Document has a `<title>` element
Document has a meta description
Page has successful HTTP status code
Links have descriptive text
Links are crawlable
robots.txt is valid
Image elements have `[alt]` attributes
Document has a valid `hreflang`
Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

75
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.40 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.62 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

19 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.012

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.69 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

4.46 s

Detailed Report

Audit breakdown by category with detailed findings.

75

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
www.ucla.edu/css/app.css?ver=0606250.0 ms403.1 KiB
www.ucla.edu/img/vote/rpp.jpg0.0 ms367.4 KiB
www.ucla.edu/img-feed-cache/Earth2520Month2520collage2520border.jpg0.0 ms322.3 KiB
www.ucla.edu/img-feed-cache/AAHM26.jpg0.0 ms311.0 KiB
www.ucla.edu/img-feed-cache/WBB.jpg0.0 ms284.8 KiB
www.ucla.edu/img/vote/rpp2.jpg0.0 ms267.4 KiB
www.ucla.edu/img-feed-cache/Edg2e_mid.jpg0.0 ms163.0 KiB
/img-feed-cache/Monkey252Bwith252BCoke-iStock-Mangkelin_9...0.0 ms156.6 KiB
www.ucla.edu/img-feed-cache/Team_mid.jpg0.0 ms145.2 KiB
www.ucla.edu/img-feed-cache/John252BMcDonald-Homeless_mid.jpg0.0 ms142.9 KiB
/v/t51.82787-15/660840206_18581701420034310_5883278954012...1209600.0 s1.3 MiB
cdn.webcomponents.ucla.edu/1.0.0-beta.15/css/ucla-lib.min.css0.0 ms127.3 KiB
www.ucla.edu/img/nav-cta-about-janns.png0.0 ms115.2 KiB
/webcomponents.ucla.edu/img/icons/social/instagram--brand...0.0 ms114.7 KiB
www.ucla.edu/js/vendor/jquery.min.js0.0 ms87.8 KiB
www.ucla.edu/js/main.js?ver=1212220.0 ms81.1 KiB
www.ucla.edu/img-feed-cache/Chancellor-Frenk.jpg0.0 ms62.3 KiB
/webcomponents.ucla.edu/public/1.0.0-beta.15/js/ucla-lib-...0.0 ms43.6 KiB
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...86400.0 s104.6 KiB
/v/t51.82787-15/660738210_18582033535034310_4074164048281...1209600.0 s376.0 KiB
/v/t51.82787-15/663151493_18582378613034310_7410689629823...1209600.0 s323.6 KiB
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...86400.0 s75.2 KiB
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...86400.0 s74.1 KiB
/v/t51.82787-15/659026738_18582390538034310_3581111324713...1209600.0 s268.6 KiB
www.ucla.edu/js/vendor/masonry.pkgd.min.js0.0 ms23.9 KiB
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...86400.0 s59.1 KiB
/v/t39.30808-6/663399630_956110183474691_2992011125068620...1209600.0 s200.1 KiB
/v/t39.30808-6/660479949_1513680927429715_865103899602011...1209600.0 s128.3 KiB
/v/t51.82787-15/657575844_18576709645042279_3271741934870...1209600.0 s124.8 KiB
/v/t51.82787-15/658785695_18581474719034310_5955129179846...1209600.0 s123.1 KiB
/v/t39.30808-6/665964626_957008790051497_6306279548422768...1209600.0 s118.3 KiB
/v/t51.82787-15/657320102_18576829036019037_4445581107452...1209600.0 s114.1 KiB
/v/t51.82787-15/658972993_18052840697719023_2170071156141...1209600.0 s110.4 KiB
/v/t39.30808-6/669195099_1495380761950764_838755299728204...1209600.0 s96.9 KiB
/v/t51.82787-15/658854407_18576954196060907_6931333870608...1209600.0 s96.2 KiB
www.ucla.edu/js/vendor/lazyload.min.js0.0 ms9.0 KiB
/v/t39.30808-6/661096014_1555450169272176_591989056633842...1209600.0 s82.1 KiB
/v/t39.30808-6/660099376_1544369697699339_549002620574311...1209600.0 s73.3 KiB
/v/t51.82787-15/658872626_18579190690042279_5683009541843...1209600.0 s65.8 KiB
/v/t51.82787-15/660141685_18574648339042508_7192986805867...1209600.0 s60.6 KiB
/v/t15.5256-10/665862413_1475356431001196_583915338208962...1209600.0 s60.1 KiB
/v/t51.82787-15/661470449_18578756353042279_9023517805759...1209600.0 s59.1 KiB
www.ucla.edu/js/vendor/smooth-scroll.min.js0.0 ms5.7 KiB
/v/t15.5256-10/665289092_761709840208833_7194136997659946...1209600.0 s51.7 KiB
www.ucla.edu/js/vendor/jquery.hideseek.min.js0.0 ms4.8 KiB
/v/t15.5256-10/664761975_701084889731410_5758363509883385...1209600.0 s46.4 KiB
/v/t39.30808-6/666703314_1515036186650170_138077008921748...1209600.0 s42.0 KiB
cse.google.com/cse.js?cx=007055646345973409059:8hr0gvmjar80.0 ms4.0 KiB
www.ucla.edu/js/vendor/stupidtable.min.js0.0 ms3.7 KiB
/v/t51.82787-10/657578392_18578710816042279_6031882207949...1209600.0 s36.0 KiB
/v/t51.82787-10/659804732_18579387577042279_8588416190070...1209600.0 s32.9 KiB
www.ucla.edu/js/vendor/jquery.scrollTo.min.js0.0 ms2.7 KiB
/webcomponents.ucla.edu/img/icons/social/tiktok--brand.svg0.0 ms2.5 KiB
/v/t51.71878-10/658444426_1484419906733647_97086042958057...1209600.0 s25.0 KiB
/webcomponents.ucla.edu/img/icons/social/threads--brand.svg0.0 ms2.4 KiB
www.ucla.edu/img/events/time-icon.svg0.0 ms2.2 KiB
www.ucla.edu/img/events/location-icon.svg0.0 ms2.1 KiB
www.ucla.edu/img/ucla_social_profile.png0.0 ms1.6 KiB
www.ucla.edu/img/logo_UCLA_white.svg0.0 ms1.5 KiB
www.ucla.edu/img/logo-ucla.svg0.0 ms1.3 KiB
/webcomponents.ucla.edu/img/icons/social/youtube--brand.svg0.0 ms1.3 KiB
/webcomponents.ucla.edu/img/icons/social/facebook--brand.svg0.0 ms1.3 KiB
/webcomponents.ucla.edu/img/icons/social/linkedin--brand.svg0.0 ms1.3 KiB
www.ucla.edu/img/search--blue.svg0.0 ms1.2 KiB
www.ucla.edu/img/external-link--defaultblue.svg0.0 ms1.1 KiB
www.ucla.edu/img/external-link--white.svg0.0 ms1.1 KiB
www.google.com/cse/static/style/look/v6/default.css3000.0 s1.2 KiB
www.ucla.edu/img/loading.svg0.0 ms996 B
s3.us-west-1.amazonaws.com/webcomponents.ucla.edu/img/icons/social/x--brand.svg0.0 ms866 B
www.ucla.edu/img/arrow-down.svg0.0 ms832 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Close up of a woman's face working in a lab div.ucla > div.col > a > img.desktop
www.ucla.edu/img/vote/rpp.jpg366.6 KiB310.4 KiB
From left: Susanna Sedrak; Her Royal Highness Princess Ghida Talal; His Majesty… div.col > div.box-wrap--2 > a.box-3__link > img.box-3__img
www.ucla.edu/img-feed-cache/AAHM26.jpg310.3 KiB298.8 KiB
The women&#039;s basketball team proudly celebrates their championship trophy, … div.col > div.box-wrap--2 > a.box-2__link > img.box-2__img
www.ucla.edu/img-feed-cache/WBB.jpg284.1 KiB273.6 KiB
Earth Month collage with red sunset skyline, elephant mom an baby, hillside tra… div.col > div.box-wrap > a.box-1__link > img.box-1__img
www.ucla.edu/img-feed-cache/Earth2520Month2520collage2520border.jpg321.6 KiB254.2 KiB
Diagram showing detailed look at changes in the Earth's surface texture li#featured-slider-slide01 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/Edg2e_mid.jpg162.4 KiB147.8 KiB
Six women in black T-shirts and jeans stand in front of a UCLA step-and-repeat … li#featured-slider-slide03 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/Team_mid.jpg144.7 KiB130.0 KiB
Students studying at a desk in a classroom li#featured-slider-slide02 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/John252BMcDonald-Homeless_mid.jpg142.5 KiB127.9 KiB
A macaque enjoys a carbonated drink div.story__featured > article.story__featured-card > a > img.story__featured-image
/img-feed-cache/Monkey252Bwith252BCoke-iStock-Mangkelin_9...156.1 KiB117.1 KiB
Will Gasparino article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...104.0 KiB101.3 KiB
Aadarsh Tripathi article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...73.6 KiB71.7 KiB
Jordan Woolery div.story__featured > article.story__featured-card > a.img-link > img.story__featured-image
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...74.7 KiB66.2 KiB
Jolyn Valeros article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/crop?url=https%3a%2f%2fdxbhsrqyrr690.cloudfront.net%2fsi...58.6 KiB57.1 KiB
Chancellor Julio Frenk Headshot section#quote > div.block-quote > figure.block-quote__img-wrapper > img
www.ucla.edu/img-feed-cache/Chancellor-Frenk.jpg61.9 KiB44.9 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-3-IMG
nodeLabel: Earth Month collage with red sunset skyline, elephant mom an baby, hillside tra…
path: 1,HTML,1,BODY,6,MAIN,1,SECTION,0,DIV,0,DIV,1,DIV,0,A,0,IMG
selector: div.col > div.box-wrap > a.box-1__link > img.box-1__img
snippet: <img class="box-1__img" src="/img-feed-cache/Earth2520Month2520collage2520border.jpg" alt="Earth Month collage with red sunset skyline, elephant mom an baby, hillsid…">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
value: no origins were preconnected
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 349 ms
URLTime Spent
ucla.edu/349 ms
www.ucla.edu/0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 60 ms 109.5 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 390 ms 490.3 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 32.6 KiB
URLTransfer SizeEst Savings
www.ucla.edu/js/main.js?ver=12122280.6 KiB32.6 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
The women&#039;s basketball team proudly celebrates their championship trophy, … div.col > div.box-wrap--2 > a.box-2__link > img.box-2__img
www.ucla.edu/img-feed-cache/WBB.jpg
From left: Susanna Sedrak; Her Royal Highness Princess Ghida Talal; His Majesty… div.col > div.box-wrap--2 > a.box-3__link > img.box-3__img
www.ucla.edu/img-feed-cache/AAHM26.jpg
Jordan Woolery div.story__featured > article.story__featured-card > a.img-link > img.story__featured-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...
Will Gasparino article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...
Jolyn Valeros article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...
Aadarsh Tripathi article.story__secondary-card > a.story__secondary-card-link > div.story__secondary-card-container > img.story__secondary-card-image
/common/controls/image_handler.aspx?thumb_prefix=rp_prima...
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052537695
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052532147
A macaque enjoys a carbonated drink div.story__featured > article.story__featured-card > a > img.story__featured-image
/img-feed-cache/Monkey252Bwith252BCoke-iStock-Mangkelin_9...
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052442271
Diagram showing detailed look at changes in the Earth's surface texture li#featured-slider-slide01 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/Edg2e_mid.jpg
Students studying at a desk in a classroom li#featured-slider-slide02 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/John252BMcDonald-Homeless_mid.jpg
Six women in black T-shirts and jeans stand in front of a UCLA step-and-repeat … li#featured-slider-slide03 > article.story__secondary-card > a.story__secondary-card-link > img.story__secondary-card-image
www.ucla.edu/img-feed-cache/Team_mid.jpg
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052430882
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052507816
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052430887
Chancellor Julio Frenk Headshot section#quote > div.block-quote > figure.block-quote__img-wrapper > img
www.ucla.edu/img-feed-cache/Chancellor-Frenk.jpg
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052611287
Close up of a woman's face working in a lab div.ucla > div.col > a > img.desktop
www.ucla.edu/img/vote/rpp.jpg
div.social-block > div.social-block__content > a.social-block__link > img.social-block__media div.social-block > div.social-block__content > a.social-block__link > img.social-block__media
api.tintup.com/v2/posts/image/8052621446
UCLA Logo div#header-wrap > div.university-logo > a > img
www.ucla.edu/img/logo-ucla.svg
UCLA div.has-background-ucla-blue > div.ucla > div.department > img.department__logo
www.ucla.edu/img/logo_UCLA_white.svg
UCLA a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
UCLA a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
ucla a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
instagram div.social-block__content > a.social-block__link > div.social-block__container > img.social-block__logo
/webcomponents.ucla.edu/img/icons/social/instagram--brand...
ucla a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
instagram div.social-block__content > a.social-block__link > div.social-block__container > img.social-block__logo
/webcomponents.ucla.edu/img/icons/social/instagram--brand...
UCLA a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
ucla a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
instagram div.social-block__content > a.social-block__link > div.social-block__container > img.social-block__logo
/webcomponents.ucla.edu/img/icons/social/instagram--brand...
UCLA a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
UCLA a.social-block__link > div.social-block__container > span.social-block__handle > img.social-block__author-image
www.ucla.edu/img/ucla_social_profile.png
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0 article.event-card > div.event-card-info > div.event-card-info__time > img.ml-0
www.ucla.edu/img/events/time-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg
article.event-card > div.event-card-info > div.event-card-info__location > img article.event-card > div.event-card-info > div.event-card-info__location > img
www.ucla.edu/img/events/location-icon.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

Max Potential First Input Delay 90 ms
Layout shift culprits
Optimize DOM size
Font display
Forced reflow
LCP breakdown
Optimize viewport for mobile
User Timing marks and measures 5 user timings
JavaScript execution time 0.2 s
Minimizes main-thread work 0.8 s
Avoid long main-thread tasks 1 long task found
Page didn't prevent back/forward cache restoration
Network Requests
Network Round Trip Times 160 ms
Server Backend Latencies 150 ms
Tasks
Diagnostics
Metrics
Screenshot Thumbnails
Final Screenshot
Script Treemap Data
Resources Summary
Initial server response time was short Root document took 20 ms
Avoid large layout shifts 2 layout shifts found
INP breakdown
Avoid non-composited animations
90

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Contact div.ucla > nav.li-links > div.li-links__container > h4.li-links__header

These are opportunities to improve keyboard navigation in your application.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Martin, Gasparino Power No. 1 UCLA to 5-… UCLA Gymnastics Adds Jolyn Valeros t… div#athletics-slider > div.splide__slider > div#athletics-slider-track > ul#athletics-slider-list

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Names and labels

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
All Baseball Cross Country Football General Gymnastics Men's Basketball Men's G… main#main-content > section.athletics > div.ucla > select#athleticsDropdown

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Interactive controls are keyboard focusable
Interactive elements indicate their purpose and state
The page has a logical tab order
Visual order on the page follows DOM order
User focus is not accidentally trapped in a region
The user's focus is directed to new content added to the page
HTML5 landmark elements are used to improve navigation
Offscreen content is hidden from assistive technology
Custom controls have associated labels
Custom controls have ARIA roles
`[aria-*]` attributes match their roles
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s have all required `[aria-*]` attributes
`[role]` values are valid
`[aria-*]` attributes have valid values
`[aria-*]` attributes are valid and not misspelled
Buttons have an accessible name
Image elements have `[alt]` attributes
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
ARIA attributes are used as specified for the element's role
`[aria-hidden="true"]` elements do not contain focusable descendents
Elements use only permitted ARIA attributes
Background and foreground colors have a sufficient contrast ratio
Document has a `<title>` element
`<html>` element has a `[lang]` attribute
`<html>` element has a valid value for its `[lang]` attribute
Links are distinguishable without relying on color.
Links have a discernible name
List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
No element has a `[tabindex]` value greater than 0
Touch targets have sufficient size and spacing.
Skip links are focusable.
Document has a main landmark.
Deprecated ARIA roles were not used
Uses ARIA roles only on compatible elements
Identical links have the same purpose.
`[accesskey]` values are unique
`button`, `link`, and `menuitem` elements have accessible names
Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
ARIA input fields have accessible names
ARIA `meter` elements have accessible names
ARIA `progressbar` elements have accessible names
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[role]`s are contained by their required parent element
Elements with the `role=text` attribute do not have focusable descendents.
ARIA toggle fields have accessible names
ARIA `tooltip` elements have accessible names
ARIA `treeitem` elements have accessible names
The page contains a heading, skip link, or landmark region
`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Definition list items are wrapped in `<dl>` elements
ARIA IDs are unique
No form fields have multiple labels
`<frame>` or `<iframe>` elements have a title
`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
Input buttons have discernible text.
`<input type="image">` elements have `[alt]` text
Form elements have associated labels
The document does not use `<meta http-equiv="refresh">`
`<object>` elements have alternate text
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
`[lang]` attributes have a valid value
`<video>` elements contain a `<track>` element with `[kind="captions"]`
Tables have different content in the summary attribute and `<caption>`.
All heading elements contain content.
Image elements do not have `[alt]` attributes that are redundant text.
Elements with visible text labels have matching accessible names.
Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
`<td>` elements in a large `<table>` have one or more table headers.
92

Best Practices

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
Failed to load resource: the server responded with a status of 403 ()

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Issue type
Content security policy
Uses HTTPS
Avoids deprecated APIs
Avoids third-party cookies
Allows users to paste into input fields
Avoids requesting the geolocation permission on page load
Avoids requesting the notification permission on page load
Displays images with correct aspect ratio
Serves images with appropriate resolution
Page has the HTML doctype
Properly defines charset
Ensure CSP is effective against XSS attacks
Use a strong HSTS policy
Ensure proper origin isolation with COOP
Mitigate DOM-based XSS with Trusted Types
Detected JavaScript libraries
Page has valid source maps
Redirects HTTP traffic to HTTPS
Mitigate clickjacking with XFO or CSP
100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Structured data is valid
Page isn’t blocked from indexing
Document has a `<title>` element
Document has a meta description
Page has successful HTTP status code
Links have descriptive text
Links are crawlable
robots.txt is valid
Image elements have `[alt]` attributes
Document has a valid `hreflang`
Document has a valid `rel=canonical`

Send Feedback