C — https://acm.org | BeaverCheck Audit

Site Health

Score: 70 / 100

Based on 8 categories, 0 sections

Room to improve — your 58.4s load time is above Google's 2.5s 'Good' threshold.

Good foundation, but a few gaps could be exploited.

Several issues make your site difficult for assistive technology users.

Solid SEO basics — a few optimizations could boost rankings.

Good server performance with room for optimization.

Mostly compliant — a few items need attention.

Missing metadata means poor previews on social media and search.

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

Cloudflare Bot Management · 302 peers

You 70

Avg 74

At average

0 50 100

Better than 5% of Cloudflare Bot Management sites See full Cloudflare Bot Management benchmark →

Google Search Console · 2306 peers

You 70

Avg 73

At average

0 50 100

Better than 14% of Google Search Console sites See full Google Search Console benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

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

Security › Security Headers

HSTS header is missing

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

Security › Security Headers

No Content-Security-Policy header found

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

Security › Content Security Policy

Page weighs 25.2 MB (15.3 MB transferred)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget

No <main> landmark found

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

Accessibility › Landmark Structure

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

Embed this badge

Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Facm.org)](https://beavercheck.com/results/7fe2e214-0a7b-4833-ac40-1c73a36efc42)

HTML

<a href="https://beavercheck.com/results/7fe2e214-0a7b-4833-ac40-1c73a36efc42"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Facm.org" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Facm.org

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 58.4s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. 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 58.4s — 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

3 critical 6 warning

9 barrier(s) likely increasing bounce by ~33%.

Speed (2)

Page takes 58.4s to load

+12% bounce

Users abandon at ~3s — you're 55.9s over the 2.5s threshold

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

Page feels frozen for 1.5s

+5% bounce

Clicks on the primary CTA are ignored while JavaScript runs

Fix: Break up long tasks; defer non-critical JavaScript to post-hydration

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)

Severe layout shift during page load

+6% bounce

Users mis-click when content jumps — converting intent into frustration

Fix: Reserve space for images, ads, and embeds with explicit width/height

Content (3)

No Open Graph tags

+2% bounce

Links shared on LinkedIn / Slack / Facebook show bare URLs — referral clicks drop

Fix: Add og:title, og:description, og:image, og:url to the page head

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, …)

Thin content

+3% bounce

Under 300 words — visitors bounce looking for substance, search engines rank competitors first

Fix: Add a substantive FAQ, product detail, or case-study section

Navigation (1)

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

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

Return on Investment

$500 investment → $3.85/month returns + USD 157,500 risk avoided

Payback period: > 2 years First-year ROI: -91%

Investment

$500

5h · 5 findings

Monthly returns

$3.85 /mo

~$46 / year

Bandwidth savings $3.85

Regulatory risk avoided

USD 157,500

if kept compliant

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

$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

Custom rate

$ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

$13,129 / month at risk

~$157,546 / 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

+4 more

Bandwidth Waste

$3.85 /mo

48085.6 MB/mo × 0.080 USD/GB

Optimize transfer: save ~4.8 MB per page load
Saves $3.85/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

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

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

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

SEO

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.

11.20 s

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

58.45 s

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

1.54 s

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

0.452

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

13.44 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.

60.75 s

Detailed Report

Audit breakdown by category with detailed findings.

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.

Request	Cache TTL	Transfer Size
s.swiftypecdn.com/install/v2/st.js	300.0 s	111.8 KiB
i.ytimg.com/vi/wO_ecqK2ARo/sddefault.jpg	7200.0 s	96.3 KiB
www.acm.org/js/acm.js?antiCache=1744907005937	14400.0 s	76.9 KiB
www.acm.org/fonts/fontawesome-webfont.woff2?v=4.3.0	14400.0 s	55.7 KiB
consent.cookiebot.com/uc.js	1040.0 s	35.7 KiB
www.acm.org/css/acm.css?antiCache=1744907005937	14400.0 s	39.4 KiB
www.acm.org/css/acm-blessed1.css?z=262	14400.0 s	35.2 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/awards/t...	2104452.0 s	136.4 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	1000691.0 s	107.8 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	459684.0 s	73.4 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	1578101.0 s	104.7 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...	788241.0 s	97.7 KiB
www.acm.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?	14400.0 s	12.9 KiB
www.acm.org/js/analytics.js?=	14400.0 s	11.3 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/p...	840477.0 s	45.8 KiB
www.acm.org/js/modernizr.js	14400.0 s	4.8 KiB
i.ytimg.com/vi/wO_ecqK2ARo/default.jpg	7200.0 s	3.3 KiB
www.acm.org/css/print.css?antiCache=1744907005937	14400.0 s	1.0 KiB
/collect?v=2&fmt=js&pid=36002&time=1776797981151&li_adsId...	0.0 ms	667 B
www.acm.org/js/classList.js	14400.0 s	951 B
www.acm.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js	2866.0 s	771 B
/consentconfig/9bb7fc8b-05a2-4292-85e6-45213b19c5ff/acm.o...	38671.0 s	1.1 KiB
www.acm.org/js/webfontloader.js	14400.0 s	626 B
www.acm.org/js/classList.js	14400.0 s	0 B
www.acm.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js	2866.0 s	0 B
www.acm.org/js/webfontloader.js	14400.0 s	0 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.451671] map[node:map[boundingRect:map[bottom:9380 height:8985 left:0 right:412 top:395 width:412] lhId:page-29-DIV nodeLabel:ACM ELECTIONS Vote in the 2026 ACM General Election - Ballots Due by 22 May at … path:1,HTML,1,BODY,14,DIV,1,DIV,0,ARTICLE,0,DIV selector:div#main > div#maincontent > article#SkipTarget > div.row snippet:<div class="row"> type:node] score:0.439879 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:942 height:118 left:32 right:380 top:825 width:348] lhId:page-28-P nodeLabel:On 16 April, ACM Professional Members in good standing as of 1 April 2026 were … path:1,HTML,1,BODY,14,DIV,1,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,2,DIV,1,P selector:div.medium-8 > div.text-wrap > div.dek > p snippet:<p> type:node] score:0.011773 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:80 height:80 left:0 right:105 top:0 width:105] lhId:page-31-IMG nodeLabel:ACM Logo path:1,HTML,1,BODY,13,DIV,1,DIV,0,DIV,1,DIV,0,A,0,IMG selector:div.logo-section > div.navbar-header > a.js-no-link-icon > img.img-responsive snippet:<img alt="ACM Logo" class="img-responsive hide-for-large-up" src="/binaries/content/gallery/global/top-menu/acm_logo_mobile.svg"> type:node]]] type:subitems]] map[score:1.9e-05]]

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQ...	60 ms
/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQ...	50 ms
/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDw...	50 ms
/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDw...	50 ms
www.acm.org/fonts/fontawesome-webfont.woff2?v=4.3.0	45 ms
fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	45 ms
fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	40 ms
/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDw...	25 ms
cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/fonts/slick.woff	25 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	20 ms
/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQ...	15 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:0.736 source:map[column:4074 line:74 type:source-location url:https://s.swiftypecdn.com/install/v2/st.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:208.971 source:map[type:text value:[unattributed]]] map[reflowTime:0.817 source:map[column:1519 line:0 type:source-location url:https://www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js urlProvider:network]] map[reflowTime:0.333 source:map[column:10068 line:24 type:source-location url:https://s.swiftypecdn.com/install/v2/st.js urlProvider:network]] map[reflowTime:0.218 source:map[column:10126 line:24 type:source-location url:https://s.swiftypecdn.com/install/v2/st.js urlProvider:network]] map[reflowTime:0.185 source:map[column:10190 line:24 type:source-location url:https://s.swiftypecdn.com/install/v2/st.js urlProvider:network]] map[reflowTime:13.014 source:map[column:31671 line:24 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:10.116 source:map[column:5009 line:25 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:0.642 source:map[column:14340 line:24 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:5.719 source:map[column:3948 line:13 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:35.09 source:map[column:2979 line:13 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:43.975 source:map[column:3934 line:13 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:0.25 source:map[column:12691 line:24 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:3.915 source:map[column:3001 line:13 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]]]

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.

	URL	Resource Size	Est Savings
A New Era for Computing Research ACM Transitions to Full Open Access ACM is tr… `div.slick-slide > div > div.slide > div.acm-banner-container`	www.acm.org/binaries/bannerlarge/content/gallery/acm/banners/acm-open	1.5 MiB	1.3 MiB
Image button linking to Awards section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-awards.jpg	529.9 KiB	518.8 KiB
Image button linking to Publich Policy section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-public-policy.jpg	510.7 KiB	499.6 KiB
Image button linking to Conferences section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-conferences.jpg	483.5 KiB	472.4 KiB
Image button linking to Publications section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-publications.jpg	471.3 KiB	460.3 KiB
ACM Awards Celebrating Innovation and Lasting Contributions ACM recognizes exc… `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/7_award...	588.9 KiB	437.4 KiB
Image button linking to Education section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-education.jpg	445.8 KiB	434.7 KiB
Image button linking to Membership section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-membership.jpg	434.0 KiB	422.9 KiB
Image button linking to Special Interest Groups section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-sigs.jpg	419.6 KiB	408.5 KiB
In-Depth Interviews ACM ByteCast ACM's podcast series at the intersection of c… `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/carouse...	379.1 KiB	263.4 KiB
2026 ACM General Election `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/general_election.jpg	212.0 KiB	200.9 KiB
acm symbol `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/acm-sym-branded.jpg	203.2 KiB	192.1 KiB
What's Happening in and Around ACM ACM Updates The latest goings-on in the wor… `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/generic...	258.8 KiB	143.2 KiB
Newsmakers ACM Members in the News Members whose achievements have made the he… `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/generic...	257.1 KiB	141.5 KiB
Image button linking to Diversity Equity & Inclusion section `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/diversit...	123.4 KiB	112.3 KiB
2025 ACM Prize recipient Matei Zaharia `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	107.4 KiB	97.4 KiB
Association for Computing Machinery Advancing Computing as a Science & Professi… `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/2_gener...	248.1 KiB	96.5 KiB
Focused Lectures On Demand ACM TechTalks Talks by industry experts, ACM award … `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/carouse...	208.5 KiB	92.9 KiB
Ricardo Baeza-Yates `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...	97.4 KiB	87.4 KiB
Message from ACM President Yannis Ioannidis about ACM's Transition to OA and Re… `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...	93.1 KiB	83.1 KiB
Communications of the ACM The Most Trusted Source The leading online and print… `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/carouse...	230.8 KiB	79.3 KiB
Ambassador for ACM Program `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/ambassad...	88.8 KiB	77.7 KiB
ACM Transitions to Full Open Access `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...	83.0 KiB	73.0 KiB
ACM A.M. Turing Award laureate Michael O. Rabin `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	73.1 KiB	63.1 KiB
ACM Queue `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...	70.3 KiB	59.2 KiB
Federal Funding of Academic Research `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...	51.4 KiB	40.7 KiB
ACM Digital Library Research, Discovery and Networking The full-text collectio… `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/carouse...	190.2 KiB	38.6 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:147.822 label:Time to first byte subpart:timeToFirstByte] map[duration:2507.018 label:Resource load delay subpart:resourceLoadDelay] map[duration:63.797 label:Resource load duration subpart:resourceLoadDuration] map[duration:139.658 label:Element render delay subpart:elementRenderDelay]]

lhId: page-27-DIV

nodeLabel: Association for Computing Machinery Advancing Computing as a Science & Professi…

path: 1,HTML,1,BODY,14,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV

selector: div#slick-slide20 > div > div.slide > div.acm-banner-container

snippet: <div class="acm-banner-container" style="background: url("/binaries/bannerlarge/content/gallery/acm/banners/2_generi…");">

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-27-DIV

nodeLabel: Association for Computing Machinery Advancing Computing as a Science & Professi…

path: 1,HTML,1,BODY,14,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV

selector: div#slick-slide20 > div > div.slide > div.acm-banner-container

snippet: <div class="acm-banner-container" style="background: url("/binaries/bannerlarge/content/gallery/acm/banners/2_generi…");">

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

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

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.

URL	Transfer Size	Duration
consent.cookiebot.com/uc.js	35.7 KiB	2.1 s
www.acm.org/js/classList.js	951 B	469 ms
www.acm.org/js/modernizr.js	4.8 KiB	619 ms
www.acm.org/js/analytics.js?=	11.3 KiB	919 ms
www.acm.org/js/webfontloader.js	626 B	469 ms
www.acm.org/css/acm.css?antiCache=1744907005937	39.4 KiB	1.5 s
cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/slick-theme.min.css	1.2 KiB	792 ms
cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/slick.css	1.1 KiB	792 ms
www.acm.org/css/acm-blessed1.css?z=262	35.2 KiB	1.7 s

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.

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: 807 ms

URL	Time Spent
acm.org/	807 ms
www.acm.org/	0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
ACM ELECTIONS Vote in the 2026 ACM General Election - Ballots Due by 22 May at … `div#main > div#maincontent > article#SkipTarget > div.row`	0.440
On 16 April, ACM Professional Members in good standing as of 1 April 2026 were … `div.medium-8 > div.text-wrap > div.dek > p`	0.012
	0.000

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

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: 300 ms 115.7 KiB

URL	Transfer Size	Est Savings
www.acm.org/css/acm.css?antiCache=1744907005937	39.2 KiB	37.5 KiB
www.acm.org/css/acm-blessed1.css?z=262	34.9 KiB	33.7 KiB
/assets/new_embed-2552d8d62d9c60f59b3b11a5d083d1ebd090c72...	33.2 KiB	33.2 KiB
	13.5 KiB	11.3 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

Estimated savings: 3.8 s 558.2 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtm.js?id=GTM-5G4WDJNB	111.4 KiB	71.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-M3TS27JG	111.4 KiB	71.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-W4CLDXL3	111.4 KiB	71.6 KiB
s.swiftypecdn.com/install/v2/st.js	111.6 KiB	69.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-5BVDRXH	121.5 KiB	68.3 KiB
www.googletagmanager.com/gtag/js?id=G-RX448GM2EK&cx=c&gtm=4e64h1	165.1 KiB	66.3 KiB
www.googletagmanager.com/gtag/js?id=AW-968097012&cx=c&gtm=4e64h1	145.5 KiB	64.6 KiB
www.acm.org/js/acm.js?antiCache=1744907005937	76.6 KiB	49.7 KiB
/9bb7fc8b-05a2-4292-85e6-45213b19c5ff/cc.js?renew=false&r...	104.7 KiB	25.0 KiB

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.

URL	Total CPU Time	Script Evaluation	Script Parse
consent.cookiebot.com/uc.js	1.9 s	1.3 s	24 ms
Unattributable	1.7 s	22 ms	0.0 ms
www.acm.org/	1.3 s	12 ms	3.4 ms
/9bb7fc8b-05a2-4292-85e6-45213b19c5ff/cc.js?renew=false&r...	584 ms	269 ms	38 ms
www.googletagmanager.com/gtag/js?id=G-RX448GM2EK&cx=c&gtm=4e64h1	476 ms	399 ms	68 ms
s.swiftypecdn.com/install/v2/st.js	330 ms	253 ms	58 ms
www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js	323 ms	299 ms	4.9 ms
www.googletagmanager.com/gtag/js?id=AW-968097012&cx=c&gtm=4e64h1	259 ms	179 ms	39 ms
www.googletagmanager.com/gtm.js?id=GTM-5BVDRXH	210 ms	172 ms	36 ms
www.acm.org/js/acm.js?antiCache=1744907005937	140 ms	69 ms	33 ms
www.googletagmanager.com/gtm.js?id=GTM-W4CLDXL3	137 ms	100 ms	36 ms
www.acm.org/js/modernizr.js	119 ms	56 ms	2.4 ms
www.googletagmanager.com/gtm.js?id=GTM-5G4WDJNB	118 ms	82 ms	34 ms
www.googletagmanager.com/gtm.js?id=GTM-M3TS27JG	103 ms	74 ms	28 ms
snap.licdn.com/li.lms-analytics/insight.min.js	90 ms	77 ms	7.6 ms

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.

Category	Time Spent
Script Evaluation	3.4 s
Other	1.9 s
Style & Layout	1.6 s
Script Parsing & Compilation	423 ms
Parse HTML & CSS	393 ms
Rendering	125 ms
Garbage Collection	124 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable

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: 0.0 ms 13.9 KiB

URL	Transfer Size	Est Savings
www.acm.org/css/acm-blessed1.css?z=262	35.2 KiB	7.4 KiB
www.acm.org/css/acm.css?antiCache=1744907005937	39.4 KiB	6.5 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
www.acm.org/binaries/bannerlarge/content/gallery/acm/banners/acm-open	1.5 MiB
/binaries/bannerlarge/content/gallery/acm/banners/7_award...	589.5 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-awards.jpg	530.4 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-public-policy.jpg	511.2 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-conferences.jpg	484.0 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-publications.jpg	471.8 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-education.jpg	446.3 KiB
www.youtube-nocookie.com/s/player/218d9d92/player_embed_es6.vflset/en_US/base.js	435.7 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-membership.jpg	434.4 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-sigs.jpg	420.0 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
2026 ACM General Election `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/general_election.jpg
ACM Transitions to Full Open Access `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
2025 ACM Prize recipient Matei Zaharia `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
acm symbol `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/acm-sym-branded.jpg
Ricardo Baeza-Yates `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...
ACM A.M. Turing Award laureate Michael O. Rabin `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
Message from ACM President Yannis Ioannidis about ACM's Transition to OA and Re… `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
ACM Transitions to Full Open Access `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
2025 ACM Prize recipient Matei Zaharia `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
acm symbol `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/acm-sym-branded.jpg
Ricardo Baeza-Yates `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...
ACM A.M. Turing Award laureate Michael O. Rabin `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
Message from ACM President Yannis Ioannidis about ACM's Transition to OA and Re… `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
ACM Transitions to Full Open Access `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
Image button linking to Publications section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-publications.jpg
Image button linking to Conferences section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-conferences.jpg
Image button linking to Special Interest Groups section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-sigs.jpg
Image button linking to Membership section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-membership.jpg
Image button linking to Awards section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-awards.jpg
Image button linking to Education section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-education.jpg
Image button linking to Diversity Equity & Inclusion section `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/diversit...
Image button linking to Publich Policy section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-public-policy.jpg
acm symbol `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/acm-sym-branded.jpg
Federal Funding of Academic Research `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
ACM Queue `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
Ambassador for ACM Program `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/ambassad...
div.row > div.medium-12 > a.js-no-link-icon > img `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/cope-cod...
techpacks `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/techpacks.jpg
div.row > div.medium-4 > a.js-no-link-icon > img `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/membersh...
Facebook logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_facebook.png
Twitter logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_x_twitter.png
LinkedIn logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_linkedin.png
Reddit logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_reddit.png
YouTube logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_youtube.png
Instagram `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_instagram.png
Flickr `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_flickr.png
Mastodon `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_mastodon.png
Bluesky `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_bluesky.png
WeChat `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_wechat.png
Substack `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_substack.png
Email `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_mail.png
ACM Logo `div.logo-section > div.navbar-header > a.js-no-link-icon > img.img-responsive`	www.acm.org/binaries/content/gallery/global/top-menu/acm_logo_mobile.svg

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

●Optimize DOM size

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●User Timing marks and measures 5 user timings

●Avoid long main-thread tasks 20 long tasks found

●Network Requests

●Network Round Trip Times 40 ms

●Server Backend Latencies 100 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 120 ms

○INP breakdown

○Avoid non-composited animations

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.

Names and labels

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.medium-12 > div.image-video-container > div.video-wrapper > iframe#ytplayer `div.medium-12 > div.image-video-container > div.video-wrapper > iframe#ytplayer`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
nav.top-bar > ul.title-area > li.toggle-topbar > a `nav.top-bar > ul.title-area > li.toggle-topbar > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.cta > div.row > div.medium-12 > a.js-no-link-icon `div.cta > div.row > div.medium-12 > a.js-no-link-icon`
div.cta > div.row > div.medium-4 > a.js-no-link-icon `div.cta > div.row > div.medium-4 > a.js-no-link-icon`

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

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
head > meta `head > meta`

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
Home `div > ul.footer__legal > li > a`
Sitemap `div > ul.footer__legal > li > a`
Contact Us `div > ul.footer__legal > li > a`
Member Services `div > ul.footer__legal > li > a`
Social Media Policy `div > ul.footer__legal > li > a`
Accessibility `div > ul.footer__legal > li > a`
Cookie Declaration `div > ul.footer__legal > li > a`

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

●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

●`[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

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[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.

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○`<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

○Select elements have associated label elements.

○Skip links are focusable.

○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.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○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.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
AttributionReporting	snap.licdn.com/li.lms-analytics/insight.min.js
SharedStorage	www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.	www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
Fledge	www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
Unload event listeners are deprecated and will be removed.	consent.cookiebot.com/uc.js line 1, col 17119

●Uses HTTPS

●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

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

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.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
www.acm.org/publications/openaccess	Read More
www.acm.org/about-acm	Learn More
www.acm.org/publications/openaccess	Read More
www.acm.org/about-acm	Learn More
www.acm.org/publications/openaccess	Read More

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●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

Performance

Accessibility

Best Practices

SEO

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.

1.11 s

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

12.59 s

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

190 ms

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

0.859

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

3.55 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.

12.78 s

Detailed Report

Audit breakdown by category with detailed findings.

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.

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 ▾

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.

Request	Cache TTL	Transfer Size
i.ytimg.com/vi/wO_ecqK2ARo/maxresdefault.jpg	7200.0 s	295.5 KiB
s.swiftypecdn.com/install/v2/st.js	300.0 s	111.8 KiB
www.acm.org/js/acm.js?antiCache=1744907005937	14400.0 s	76.9 KiB
www.acm.org/fonts/fontawesome-webfont.woff2?v=4.3.0	14400.0 s	55.7 KiB
consent.cookiebot.com/uc.js	1013.0 s	35.7 KiB
www.acm.org/css/acm.css?antiCache=1744907005937	14400.0 s	39.4 KiB
www.acm.org/css/acm-blessed1.css?z=262	14400.0 s	35.2 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/awards/t...	2104452.0 s	136.4 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	1000691.0 s	107.8 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	459684.0 s	73.4 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	1578101.0 s	104.7 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...	788241.0 s	97.8 KiB
www.acm.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?	14400.0 s	13.0 KiB
www.acm.org/js/analytics.js?=	14400.0 s	11.3 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
/binaries/ctaimagelarge/content/gallery/acm/ctas/people/p...	840477.0 s	45.8 KiB
www.acm.org/js/modernizr.js	14400.0 s	4.8 KiB
i.ytimg.com/vi/wO_ecqK2ARo/default.jpg	7200.0 s	3.3 KiB
www.acm.org/css/print.css?antiCache=1744907005937	14400.0 s	1.0 KiB
www.acm.org/js/classList.js	14400.0 s	951 B
www.acm.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js	2866.0 s	771 B
/consentconfig/9bb7fc8b-05a2-4292-85e6-45213b19c5ff/acm.o...	38645.0 s	1.1 KiB
/collect?v=2&fmt=js&pid=36002&time=1776798007899&li_adsId...	0.0 ms	452 B
www.acm.org/js/webfontloader.js	14400.0 s	626 B
www.acm.org/js/classList.js	14400.0 s	0 B
www.acm.org/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js	2866.0 s	0 B
www.acm.org/js/webfontloader.js	14400.0 s	0 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

items: [map[node:map[type:text value:Total] score:0.8586719999999999] map[node:map[boundingRect:map[bottom:4228 height:3786 left:0 right:1350 top:442 width:1350] lhId:page-33-ARTICLE nodeLabel:ACM ELECTIONS Vote in the 2026 ACM General Election - Ballots Due by 22 May at … path:1,HTML,1,BODY,14,DIV,1,DIV,0,ARTICLE selector:body > div#main > div#maincontent > article#SkipTarget snippet:<article class="has-edit-button" id="SkipTarget" tabindex="-1"> type:node] score:0.645415 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQk6YvM.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDwM9QPFUew.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:4228 height:4091 left:0 right:1350 top:137 width:1350] lhId:page-38-DIV nodeLabel:Previous A New Era for Computing Research ACM Transitions to Full Open Access … path:1,HTML,1,BODY,14,DIV selector:body > div#main snippet:<div id="main"> type:node] score:0.210776 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:650 height:59 left:500 right:1231 top:591 width:731] lhId:page-32-P nodeLabel:On 16 April, ACM Professional Members in good standing as of 1 April 2026 were … path:1,HTML,1,BODY,14,DIV,1,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,2,DIV,1,P selector:div.medium-8 > div.text-wrap > div.dek > p snippet:<p> type:node] score:0.001905 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1199 height:158 left:119 right:357 top:1041 width:238] lhId:page-4-IMG nodeLabel:Image button linking to Publications section path:1,HTML,1,BODY,14,DIV,1,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,2,A,0,IMG selector:div.row > div.medium-12 > a.js-no-link-icon > img snippet:<img src="/binaries/ctaimagelarge/content/gallery/acm/ctas/og-publications.jpg" alt="Image button linking to Publications section"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:687 height:205 left:119 right:468 top:482 width:349] lhId:page-10-IMG nodeLabel:2026 ACM General Election path:1,HTML,1,BODY,14,DIV,1,DIV,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,A,0,IMG selector:div.row > div.medium-4 > a.js-no-link-icon > img snippet:<img src="/binaries/ctaimagelarge/content/gallery/acm/ctas/general_election.jpg" alt="2026 ACM General Election" style="margin-bottom:0;padding-bottom:0;"> type:node] score:0.000576]]

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.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
www.acm.org/fonts/fontawesome-webfont.woff2?v=4.3.0	75 ms
/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQ...	30 ms
/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQ...	30 ms
/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDw...	25 ms
fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	25 ms
/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDw...	20 ms
/s/robotocondensed/v31/ieVj2ZhZI2eCN5jzbjEETS9weq8-19eLDw...	15 ms
fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	10 ms
cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/fonts/slick.woff	10 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	5.0 ms
/s/robotocondensed/v31/ieVl2ZhZI2eCN5jzbjEETS9weq8-19K7DQ...	5.0 ms

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:25.794 source:map[column:67466 line:2 type:source-location url:https://consent.cookiebot.com/uc.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:368.225 source:map[type:text value:[unattributed]]] map[reflowTime:12.919 source:map[column:3001 line:13 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:46.441 source:map[column:31671 line:24 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:36.876 source:map[column:5009 line:25 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:1.061 source:map[column:6429 line:25 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:9.28 source:map[column:3948 line:13 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:47.422 source:map[column:2979 line:13 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:25.794 source:map[column:82434 line:1 type:source-location url:https://consent.cookiebot.com/uc.js urlProvider:network]] map[reflowTime:68.434 source:map[column:3934 line:13 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]] map[reflowTime:0.702 source:map[column:12691 line:24 type:source-location url:https://www.acm.org/js/acm.js?antiCache=1744907005937 urlProvider:network]]]

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.

	URL	Resource Size	Est Savings
A New Era for Computing Research ACM Transitions to Full Open Access ACM is tr… `div#slick-slide24 > div > div.slide > div.acm-banner-container`	www.acm.org/binaries/bannerlarge/content/gallery/acm/banners/acm-open	1.5 MiB	1.3 MiB
Image button linking to Awards section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-awards.jpg	529.9 KiB	524.7 KiB
Image button linking to Publich Policy section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-public-policy.jpg	510.7 KiB	505.5 KiB
Image button linking to Conferences section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-conferences.jpg	483.5 KiB	478.0 KiB
Image button linking to Publications section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-publications.jpg	471.3 KiB	466.2 KiB
Image button linking to Education section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-education.jpg	445.8 KiB	440.2 KiB
ACM Awards Celebrating Innovation and Lasting Contributions ACM recognizes exc… `div#slick-slide23 > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/7_award...	588.9 KiB	437.4 KiB
Image button linking to Membership section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-membership.jpg	434.0 KiB	428.8 KiB
Image button linking to Special Interest Groups section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-sigs.jpg	419.6 KiB	414.1 KiB
In-Depth Interviews ACM ByteCast ACM's podcast series at the intersection of c… `div#slick-slide04 > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/carouse...	379.1 KiB	263.4 KiB
2026 ACM General Election `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/general_election.jpg	212.0 KiB	200.8 KiB
acm symbol `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/acm-sym-branded.jpg	203.2 KiB	192.0 KiB
What's Happening in and Around ACM ACM Updates The latest goings-on in the wor… `div#slick-slide01 > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/generic...	258.8 KiB	143.2 KiB
Newsmakers ACM Members in the News Members whose achievements have made the he… `div#slick-slide02 > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/generic...	257.1 KiB	141.5 KiB
Image button linking to Diversity Equity & Inclusion section `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/diversit...	123.4 KiB	117.9 KiB
div.row > div.medium-12 > a.js-no-link-icon > img `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/cope-cod...	114.9 KiB	105.0 KiB
2025 ACM Prize recipient Matei Zaharia `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	107.4 KiB	96.6 KiB
Association for Computing Machinery Advancing Computing as a Science & Professi… `div.slick-slide > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/2_gener...	248.1 KiB	96.5 KiB
Focused Lectures On Demand ACM TechTalks Talks by industry experts, ACM award … `div#slick-slide03 > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/carouse...	208.5 KiB	92.9 KiB
Ricardo Baeza-Yates `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...	97.4 KiB	86.6 KiB
Message from ACM President Yannis Ioannidis about ACM's Transition to OA and Re… `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...	93.1 KiB	82.3 KiB
Communications of the ACM The Most Trusted Source The leading online and print… `div#slick-slide22 > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/carouse...	230.8 KiB	79.3 KiB
Ambassador for ACM Program `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/ambassad...	88.8 KiB	79.0 KiB
ACM Transitions to Full Open Access `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...	83.0 KiB	72.2 KiB
ACM A.M. Turing Award laureate Michael O. Rabin `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...	73.1 KiB	62.2 KiB
ACM Queue `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...	70.3 KiB	59.1 KiB
div.row > div.medium-4 > a.js-no-link-icon > img `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/membersh...	57.5 KiB	46.3 KiB
Federal Funding of Academic Research `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...	51.4 KiB	41.9 KiB
ACM Digital Library Research, Discovery and Networking The full-text collectio… `div#slick-slide21 > div > div.slide > div.acm-banner-container`	/binaries/bannerlarge/content/gallery/acm/banners/carouse...	190.2 KiB	38.6 KiB
techpacks `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/techpacks.jpg	32.4 KiB	26.5 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:169.07 label:Time to first byte subpart:timeToFirstByte] map[duration:2777.124 label:Resource load delay subpart:resourceLoadDelay] map[duration:55.306 label:Resource load duration subpart:resourceLoadDuration] map[duration:253.766 label:Element render delay subpart:elementRenderDelay]]

lhId: page-30-DIV

nodeLabel: Association for Computing Machinery Advancing Computing as a Science & Professi…

path: 1,HTML,1,BODY,14,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV

selector: div#slick-slide20 > div > div.slide > div.acm-banner-container

snippet: <div class="acm-banner-container" style="background: url("/binaries/bannerlarge/content/gallery/acm/banners/2_generi…");">

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-30-DIV

nodeLabel: Association for Computing Machinery Advancing Computing as a Science & Professi…

path: 1,HTML,1,BODY,14,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV

selector: div#slick-slide20 > div > div.slide > div.acm-banner-container

snippet: <div class="acm-banner-container" style="background: url("/binaries/bannerlarge/content/gallery/acm/banners/2_generi…");">

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.

title: Preconnected origins

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

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.

URL	Transfer Size	Duration
consent.cookiebot.com/uc.js	35.7 KiB	419 ms
www.acm.org/js/analytics.js?=	11.3 KiB	180 ms
www.acm.org/js/webfontloader.js	626 B
www.acm.org/js/classList.js	951 B	140 ms
cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/slick-theme.min.css	1.2 KiB	304 ms
cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.9.0/slick.css	1.1 KiB	304 ms
www.acm.org/css/acm.css?antiCache=1744907005937	39.4 KiB	220 ms
www.acm.org/js/modernizr.js	4.8 KiB	140 ms
www.acm.org/css/acm-blessed1.css?z=262	35.2 KiB	220 ms

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: 263 ms

URL	Time Spent
acm.org/	263 ms
www.acm.org/	0.0 ms

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
ACM ELECTIONS Vote in the 2026 ACM General Election - Ballots Due by 22 May at … `body > div#main > div#maincontent > article#SkipTarget`	0.645
Previous A New Era for Computing Research ACM Transitions to Full Open Access … `body > div#main`	0.211
On 16 April, ACM Professional Members in good standing as of 1 April 2026 were … `div.medium-8 > div.text-wrap > div.dek > p`	0.002
2026 ACM General Election `div.row > div.medium-4 > a.js-no-link-icon > img`	0.001

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

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

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: 80 ms 101.8 KiB

URL	Transfer Size	Est Savings
www.acm.org/css/acm.css?antiCache=1744907005937	39.2 KiB	35.9 KiB
www.acm.org/css/acm-blessed1.css?z=262	34.9 KiB	33.1 KiB
/assets/new_embed-2552d8d62d9c60f59b3b11a5d083d1ebd090c72...	33.2 KiB	32.8 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 ▾

Source: Google web.dev / Lighthouse

Estimated savings: 560 ms 558.3 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtm.js?id=GTM-M3TS27JG	111.4 KiB	71.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-W4CLDXL3	111.4 KiB	71.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-5G4WDJNB	111.4 KiB	71.6 KiB
s.swiftypecdn.com/install/v2/st.js	111.6 KiB	69.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-5BVDRXH	121.5 KiB	68.3 KiB
www.googletagmanager.com/gtag/js?id=G-RX448GM2EK&cx=c&gtm=4e64h1	165.1 KiB	66.3 KiB
www.googletagmanager.com/gtag/js?id=AW-968097012&cx=c&gtm=4e64h1	145.5 KiB	64.6 KiB
www.acm.org/js/acm.js?antiCache=1744907005937	76.6 KiB	49.9 KiB
/9bb7fc8b-05a2-4292-85e6-45213b19c5ff/cc.js?renew=false&r...	104.7 KiB	25.0 KiB

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.

Category	Time Spent
Script Evaluation	914 ms
Style & Layout	809 ms
Other	390 ms
Parse HTML & CSS	150 ms
Script Parsing & Compilation	94 ms
Rendering	77 ms
Garbage Collection	13 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable

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: 0.0 ms 13.9 KiB

URL	Transfer Size	Est Savings
www.acm.org/css/acm-blessed1.css?z=262	35.2 KiB	7.4 KiB
www.acm.org/css/acm.css?antiCache=1744907005937	39.4 KiB	6.5 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
www.acm.org/binaries/bannerlarge/content/gallery/acm/banners/acm-open	1.5 MiB
/binaries/bannerlarge/content/gallery/acm/banners/7_award...	589.5 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-awards.jpg	530.4 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-public-policy.jpg	511.2 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-conferences.jpg	484.0 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-publications.jpg	471.8 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-education.jpg	446.2 KiB
www.youtube-nocookie.com/s/player/218d9d92/player_embed_es6.vflset/en_US/base.js	435.7 KiB
www.youtube-nocookie.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js	435.7 KiB
www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-membership.jpg	434.5 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
artifact-badges.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
Regional Councils.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/regional...
ACM History `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/history.jpg
skills-bundle.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/learning...
ACM membership FAQ `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/membership-faq.jpg
Ambassador for ACM Program `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/ambassad...
Publish your work `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publish-...
practical_content_journals.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/practica...
Join an ACM SIG `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/join-an-acm-sig.jpg
promoting-sharing.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
Find a SIG Conference `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/find-a-s...
promoting-sharing.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
chapter_box.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/chapter_box.jpg
li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/chapters...
li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/start-a-chapter.jpg
2025 ACM A.M. Turing Award recipients Charles H. Bennett and Gilles Brassard `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/awards/t...
2025 ACM Prize recipient Matei Zaharia `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
Ricardo Baeza-Yates `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...
Image of webinar panel `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/educatio...
Image of Angelica Lo Duca `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/a...
Image of Russ Cox `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...
Image of Peter Stone `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/p...
Image of Monica Bertagnolli `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
Image of Ray Eitel-Porter `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...
TechBrief on Buying Versus Building LLMs `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/public-p...
tpc-remote-proctoring-software.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/public-p...
europetpc-diggreencerts-stmt.jpg `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/public-p...
Image with the text, `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/diversit...
Image with the text, `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/diversit...
Image of different skin tone hands in a high-five circle `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/diversit...
2026 ACM General Election `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/general_election.jpg
ACM Transitions to Full Open Access `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
2025 ACM Prize recipient Matei Zaharia `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
acm symbol `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/acm-sym-branded.jpg
Ricardo Baeza-Yates `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...
ACM A.M. Turing Award laureate Michael O. Rabin `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
Message from ACM President Yannis Ioannidis about ACM's Transition to OA and Re… `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
ACM Transitions to Full Open Access `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
2025 ACM Prize recipient Matei Zaharia `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
acm symbol `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/acm-sym-branded.jpg
Ricardo Baeza-Yates `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/r...
ACM A.M. Turing Award laureate Michael O. Rabin `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/people/m...
Message from ACM President Yannis Ioannidis about ACM's Transition to OA and Re… `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
ACM Transitions to Full Open Access `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
Image button linking to Publications section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-publications.jpg
Image button linking to Conferences section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-conferences.jpg
Image button linking to Special Interest Groups section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-sigs.jpg
Image button linking to Membership section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-membership.jpg
Image button linking to Awards section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-awards.jpg
Image button linking to Education section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-education.jpg
Image button linking to Diversity Equity & Inclusion section `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/diversit...
Image button linking to Publich Policy section `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/og-public-policy.jpg
acm symbol `div.row > div.medium-4 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/acm-sym-branded.jpg
Federal Funding of Academic Research `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
ACM Queue `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/publicat...
Ambassador for ACM Program `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/ambassad...
div.row > div.medium-12 > a.js-no-link-icon > img `div.row > div.medium-12 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/cope-cod...
techpacks `div.row > div.medium-12 > a.js-no-link-icon > img`	www.acm.org/binaries/ctaimagelarge/content/gallery/acm/ctas/techpacks.jpg
div.row > div.medium-4 > a.js-no-link-icon > img `div.row > div.medium-4 > a.js-no-link-icon > img`	/binaries/ctaimagelarge/content/gallery/acm/ctas/membersh...
ACM Logo `div > div > div.logo_social_group > img`	www.acm.org/binaries/content/gallery/acm/logos/logo_footer_acm.png
ACM Logo `div.logo-section > div.navbar-header > a.navbar-brand > img.img-responsive`	www.acm.org/binaries/content/gallery/global/top-menu/acm_logo_tablet.svg
Facebook logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_facebook.png
Twitter logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_x_twitter.png
LinkedIn logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_linkedin.png
Reddit logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_reddit.png
YouTube logo `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_youtube.png
Instagram `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_instagram.png
Flickr `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_flickr.png
Mastodon `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_mastodon.png
Bluesky `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_bluesky.png
WeChat `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_wechat.png
Substack `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_substack.png
Email `ul.footer__social > li > a.js-no-link-icon > img`	www.acm.org/binaries/content/gallery/acm/social-media/icon_mail.png

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

●Optimize DOM size

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.9 s

●Avoid long main-thread tasks 7 long tasks found

●Network Requests

●Network Round Trip Times 40 ms

●Server Backend Latencies 120 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 130 ms

○INP breakdown

○Avoid non-composited animations

Accessibility

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`
li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.medium-12 > div.image-video-container > div.video-wrapper > iframe#ytplayer `div.medium-12 > div.image-video-container > div.video-wrapper > iframe#ytplayer`

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
ul.infonav > li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon `ul.infonav > li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon`
ul.infonav > li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon `ul.infonav > li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.row > div.medium-12 > h2.text-center > a `div.row > div.medium-12 > h2.text-center > a`
div.cta > div.row > div.medium-12 > a.js-no-link-icon `div.cta > div.row > div.medium-12 > a.js-no-link-icon`
div.cta > div.row > div.medium-4 > a.js-no-link-icon `div.cta > div.row > div.medium-4 > a.js-no-link-icon`

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

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
head > meta `head > meta`

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
About ACM `div.footer-nav > ul.footer-nav-lists > li > a`
Volunteer `div.footer-nav > ul.footer-nav-lists > li > a`
Join ACM `div.footer-nav > ul.footer-nav-lists > li > a`
Renew My Membership `div.footer-nav > ul.footer-nav-lists > li > a`
Membership Options `div.footer-nav > ul.footer-nav-lists > li > a`
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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

●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

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Input buttons have discernible text.

●Form elements have associated labels

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[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.

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○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.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○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.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
AttributionReporting	snap.licdn.com/li.lms-analytics/insight.min.js
SharedStorage	www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.	www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
Fledge	www.acm.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
Unload event listeners are deprecated and will be removed.	consent.cookiebot.com/uc.js line 1, col 17119

●Uses HTTPS

●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

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

SEO

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
www.acm.org/publications/openaccess	Read More
www.acm.org/about-acm	Learn More
www.acm.org/publications/openaccess	Read More
www.acm.org/about-acm	Learn More
www.acm.org/publications/openaccess	Read More

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`
li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img `li.infonav__ctaList > div.infonav__ctaList-cta > a.js-no-link-icon > img`

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`

Results for https://acm.org

Site Health

How you compare

Top Priorities (5)

Fix Priority Matrix

Quick Wins

Strategic

Easy Improvements

Deprioritize

What fixing these means

Conversion Barriers

Speed (2)

Trust (2)

Usability (1)

Content (3)

Navigation (1)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Estimated Remediation Cost

Cost by category

Cost by effort level

What Inaction Is Costing You

Compliance Risk

Bandwidth Waste

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Best practices

Best Practices

General

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Best practices

Best Practices

General

SEO

Content Best Practices

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