C — https://uam.es | BeaverCheck Audit

Site Health

Score: 71 / 100

Based on 8 categories, 0 sections

Room to improve — your 13.4s load time is above Google's 2.5s 'Good' threshold.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Well-optimized for search — your content is discoverable.

Good server performance with room for optimization.

Mostly compliant — a few items need attention.

Rich content metadata — your pages look great everywhere.

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

Bootstrap · 823 peers

You 71

Avg 73

At average

0 50 100

Better than 19% of Bootstrap sites See full Bootstrap benchmark →

Google Search Console · 3591 peers

You 71

Avg 73

At average

0 50 100

Better than 22% 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 8.9 MB (7.9 MB transferred)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget

53 third-party resources (100% of weight)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Inventory

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 →

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fuam.es)](https://beavercheck.com/results/93cc8597-a36f-4369-85ff-fae45ccd7275)

HTML

<a href="https://beavercheck.com/results/93cc8597-a36f-4369-85ff-fae45ccd7275"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fuam.es" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fuam.es

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 13.4s exceeds Google's 2.5s 'Good' threshold and the 2 performance issues below directly contribute to it. 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 13.4s — fixing the 2 performance criticals could bring it under Google's 2.5s 'Good' threshold.

Conversion Barriers

3 critical 3 warning

6 barrier(s) likely increasing bounce by ~28%.

Speed (2)

Page takes 13.4s to load

+12% bounce

Users abandon at ~3s — you're 10.9s over the 2.5s threshold

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

Page feels frozen for 624ms

+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

Navigation (2)

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

4 broken link(s) on the page

+5% bounce

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

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

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

Return on Investment

€303 investment → €1,389/month returns + EUR 120,500,000 risk avoided

Payback period: < 1 month First-year ROI: +5408%

Investment

€303

6h · 5 findings

Monthly returns

€1,389 /mo

~€16,663 / year

Conversions recovered €1,387
Bandwidth savings €1.85

Regulatory risk avoided

EUR 120,500,000

if kept compliant

ePrivacy Directive EUR 100,000,000
RGPD EUR 20,000,000
EAA EUR 500,000

Payback period

0 12mo 24mo

€83 — 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

€303

5.5 developer hours at €55/hr

Based on Spain rates (€55/hr)

Quick wins

€83 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

€10,041,669 / month at risk

~€120,500,022 / year if left unfixed

Compliance Risk

€120,500,000

ePrivacy DirectiveRGPDEAA

No privacy policy link detected
RGPD: EUR 10,000 – EUR 20,000,000
1 advertising/retargeting trackers detected
RGPD: EUR 10,000 – EUR 20,000,000
Trackers detected but no cookie policy found
RGPD: EUR 5,000 – EUR 10,000,000

+5 more

Bandwidth Waste

€1.85 /mo

24986.6 MB/mo × 0.074 EUR/GB

Optimize transfer: save ~2.5 MB per page load
Saves €1.85/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 4 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

100

Best Practices

100

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.

9.06 s

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

13.38 s

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

624 ms

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

0.062

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

9.59 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.

20.21 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
/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...	0.0 ms	795.0 KiB
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	0.0 ms	476.6 KiB
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	0.0 ms	452.8 KiB
www.uam.es/uam/media/img/1606928370518/infografia-consumo-19-5-23.svg	0.0 ms	405.4 KiB
www.uam.es/uam/media/img/1606995215633/portada-23-24.svg	0.0 ms	217.5 KiB
www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg	0.0 ms	183.6 KiB
/uam/media/imgm/1607032085952/purple-orange-modern-abstra...	0.0 ms	178.5 KiB
www.uam.es/uam/media/imgl/1607033349710/2026-04-21-gonzalez-beltran-img.jpg	0.0 ms	99.1 KiB
www.uam.es/uam/media/imgm/1607031525181/1.-mesa-de-portavoces-ceuam-2026.jpeg	0.0 ms	92.9 KiB
www.uam.es/uam/media/imgm/1607032400126/voluntariado-web.jpg	0.0 ms	84.7 KiB
www.uam.es/uam/media/imgm/1607032375722/fifimac.jpg	0.0 ms	80.8 KiB
www.uam.es/uam/media/imgm/1607033328935/jpa.jpg	0.0 ms	68.9 KiB
www.uam.es/uam/media/imgm/1607032078382/2026-04-16-arnanz-csic.jpg	0.0 ms	67.1 KiB
www.uam.es/uam/media/imgm/1606903067572/fotoccd.jpg	0.0 ms	40.0 KiB
/uam/media/imgm/1606937915229/imagenuamantecrisishumanita...	0.0 ms	38.0 KiB
www.uam.es/uam/media/imgm/1607032081544/2026-04-17-barbera-rjb-jpg.jpg	0.0 ms	34.9 KiB
www.uam.es/estaticos/UAM-R/js/wcs.js?v=13	0.0 ms	27.7 KiB
www.uam.es/uam/media/imgm/1607032075390/2026-04-14-suderov-ifimac-img.jpg	0.0 ms	27.6 KiB
www.uam.es/uam/media/imgm/1606859313941/banner-agenda-2024.jpg	0.0 ms	19.8 KiB
www.uam.es/uam/media/img/1606893064532/marcauam-ahorizontalcolor-imp.svg	0.0 ms	16.9 KiB
ssl.google-analytics.com/ga.js	7200.0 s	17.4 KiB
www.uam.es/uam/media/img/1606848842005/santander-logo-color-01.png	0.0 ms	12.0 KiB
www.uam.es/uam/media/img/1606848842193/fue-logo-color-01.png	0.0 ms	11.4 KiB
www.uam.es/estaticos/Comun/fonts/uam-icons/uam-icons.woff2?51217462	0.0 ms	7.7 KiB
www.uam.es/uam/media/img/1606848842439/hr-logo-color-01.png	0.0 ms	6.4 KiB
www.uam.es/uam/media/img/1606957595533/parquecientifico.png	0.0 ms	5.7 KiB
www.uam.es/uam/media/img/1606848841888/universia-logo-color-01.png	0.0 ms	5.3 KiB
www.uam.es/uam/media/img/1606893866850/uam-solo.svg	0.0 ms	3.1 KiB
www.uam.es/estaticos/UAM-R/js/analytics.js?v=13	0.0 ms	1.9 KiB
www.uam.es/estaticos/UAM-R/videos/video-home.mp4	0.0 ms	0 B

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.uam.es/estaticos/Comun/fonts/uam-icons/uam-icons.woff2?51217462	180 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:87.991 source:map[column:52 line:996 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 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:121.275 source:map[type:text value:[unattributed]]] map[reflowTime:4.011 source:map[column:34 line:9266 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:69.664 source:map[column:42 line:1764 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:2.14 source:map[column:31 line:1784 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:0.7 source:map[column:31 line:1785 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:0.426 source:map[column:31 line:1786 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:10.497 source:map[column:66 line:1764 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:0.553 source:map[column:59 line:1816 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 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
Imagen promocional de la UAM. / UAM `div.col-md-6 > div.uam-media-container > picture > img.uam-media`	/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...	791.6 KiB	747.6 KiB
Portal con los podcasts que se crean en la UAM `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	/uam/media/imgm/1607032085952/purple-orange-modern-abstra...	176.6 KiB	147.7 KiB
body > div.hero-banner > div.hero-banner-img-wrapper > video#uam-video-background `body > div.hero-banner > div.hero-banner-img-wrapper > video#uam-video-background`	www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg	181.7 KiB	126.5 KiB
kroshka__nastya/Freepik `div.col-md-6 > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgl/1607033349710/2026-04-21-gonzalez-beltran-img.jpg	98.0 KiB	69.3 KiB
Adrián Vayas Gallego, derecha, junto al resto de los miembros de la nueva mesa … `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607031525181/1.-mesa-de-portavoces-ceuam-2026.jpeg	91.5 KiB	54.1 KiB
Imagen de grupo ante el stand de la Oficina de Acción Solidaria de la UAM. `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607032400126/voluntariado-web.jpg	83.7 KiB	38.4 KiB
Laguna en la dehesa de Chapinería, Madrid. Crédito: Christian Arnanz Porras `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607032078382/2026-04-16-arnanz-csic.jpg	65.9 KiB	37.3 KiB
De izquierda a derecha: Enrique García Michel, Rubén Pérez, la rectora Amaya Me… `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607032375722/fifimac.jpg	79.6 KiB	25.6 KiB
Dos jóvenes consultan un mapa en el Campus de Cantoblanco/ UAM `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607033328935/jpa.jpg	67.8 KiB	23.1 KiB
Imágenes del material de herbario de la única especie conocida del género, Ewan… `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607032081544/2026-04-17-barbera-rjb-jpg.jpg	33.9 KiB	19.2 KiB
Imagen que muestra a una estudiante tomando notas frente a un ordenador `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/imgm/1606903067572/fotoccd.jpg	39.0 KiB	15.3 KiB
Antes de este trabajo, la visión sobre el efecto de impurezas magnéticas en los… `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607032075390/2026-04-14-suderov-ifimac-img.jpg	26.7 KiB	15.1 KiB
Logotipo de la iniciativa UAM ante crisis humanitarias, con texto Donaciones `div.uam-media-container > a.lightbox > picture > img.uam-media`	/uam/media/imgm/1606937915229/imagenuamantecrisishumanita...	37.1 KiB	14.5 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-2-VIDEO

nodeLabel: body > div.hero-banner > div.hero-banner-img-wrapper > video#uam-video-background

path: 1,HTML,1,BODY,5,DIV,0,DIV,0,VIDEO

selector: body > div.hero-banner > div.hero-banner-img-wrapper > video#uam-video-background

snippet: <video loop="" muted="" autoplay="" playsinline="" onloadedmetadata="this.muted = true" id="uam-video-background" src="/estaticos/UAM-R/videos/video-home.mp4" poster="https://www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg" type="video/mp4">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.uam.es/uam/inicio	http/1.1
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	http/1.1
www.uam.es/estaticos/UAM-R/js/wcs.js?v=13	http/1.1
www.uam.es/estaticos/UAM-R/js/analytics.js?v=13	http/1.1
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	http/1.1
www.uam.es/uam/media/img/1606893064532/marcauam-ahorizontalcolor-imp.svg	http/1.1
www.uam.es/uam/media/img/1606893866850/uam-solo.svg	http/1.1
www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg	http/1.1
/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...	http/1.1
www.uam.es/uam/media/imgm/1607033328935/jpa.jpg	http/1.1
www.uam.es/uam/media/imgm/1607032375722/fifimac.jpg	http/1.1
www.uam.es/uam/media/imgm/1607032400126/voluntariado-web.jpg	http/1.1
www.uam.es/uam/media/imgm/1607031525181/1.-mesa-de-portavoces-ceuam-2026.jpeg	http/1.1
www.uam.es/uam/media/imgl/1607033349710/2026-04-21-gonzalez-beltran-img.jpg	http/1.1
www.uam.es/uam/media/imgm/1607032081544/2026-04-17-barbera-rjb-jpg.jpg	http/1.1
www.uam.es/uam/media/imgm/1607032078382/2026-04-16-arnanz-csic.jpg	http/1.1
/uam/media/imgm/1607032085952/purple-orange-modern-abstra...	http/1.1
www.uam.es/uam/media/imgm/1607032075390/2026-04-14-suderov-ifimac-img.jpg	http/1.1
www.uam.es/uam/media/imgm/1606859313941/banner-agenda-2024.jpg	http/1.1
www.uam.es/uam/media/img/1606995215633/portada-23-24.svg	http/1.1
/uam/media/imgm/1606937915229/imagenuamantecrisishumanita...	http/1.1
www.uam.es/uam/media/imgm/1606903067572/fotoccd.jpg	http/1.1
www.uam.es/uam/media/img/1606928370518/infografia-consumo-19-5-23.svg	http/1.1
www.uam.es/estaticos/UAM-R/videos/video-home.mp4	http/1.1
www.uam.es/uam/media/img/1606848842193/fue-logo-color-01.png	http/1.1
www.uam.es/uam/media/img/1606848842439/hr-logo-color-01.png	http/1.1
www.uam.es/uam/media/img/1606957595533/parquecientifico.png	http/1.1
www.uam.es/uam/media/img/1606848841888/universia-logo-color-01.png	http/1.1
www.uam.es/uam/media/img/1606848842005/santander-logo-color-01.png	http/1.1
www.uam.es/estaticos/Comun/fonts/uam-icons/uam-icons.woff2?51217462	http/1.1
www.uam.es/estaticos/UAM-R/images/favicon.ico	http/1.1

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

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
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	452.8 KiB	4.0 s
/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,7...	2.5 KiB
ssl.google-analytics.com/ga.js	17.4 KiB	903 ms
fonts.googleapis.com/css?family=Playfair+Display&display=swap	1008 B	759 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: 1.3 s

URL	Time Spent
uam.es/	1.3 s
www.uam.es/uam/inicio	0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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: 1.5 s 428.1 KiB

URL	Transfer Size	Est Savings
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	452.5 KiB	428.1 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: 450 ms 540.0 KiB

URL	Transfer Size	Est Savings
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	476.2 KiB	319.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-5C3C3B3	139.3 KiB	71.1 KiB
www.googletagmanager.com/gtag/js?id=G-5TG18SW503	176.2 KiB	67.9 KiB
www.googletagmanager.com/gtag/js?id=AW-17987922144	143.3 KiB	57.0 KiB
www.uam.es/estaticos/UAM-R/js/wcs.js?v=13	27.3 KiB	24.8 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
www.uam.es/uam/inicio	1.6 s	10 ms	2.0 ms
Unattributable	1.2 s	23 ms	0.0 ms
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	1.1 s	623 ms	114 ms
www.googletagmanager.com/gtag/js?id=G-5TG18SW503	615 ms	404 ms	80 ms
www.googletagmanager.com/gtm.js?id=GTM-5C3C3B3	419 ms	361 ms	55 ms
www.googletagmanager.com/gtag/js?id=AW-17987922144	134 ms	74 ms	58 ms
www.uam.es/estaticos/UAM-R/js/analytics.js?v=13	54 ms	50 ms	0.5 ms
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	51 ms	0.0 ms	0.0 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
Other	1.7 s
Script Evaluation	1.6 s
Style & Layout	1.1 s
Rendering	447 ms
Script Parsing & Compilation	322 ms
Parse HTML & CSS	94 ms
Garbage Collection	34 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 169.1 KiB

URL	Transfer Size	Est Savings
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	476.3 KiB	165.0 KiB
www.uam.es/estaticos/UAM-R/js/wcs.js?v=13	27.3 KiB	4.1 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.uam.es/estaticos/UAM-R/videos/video-home.mp4	3.8 MiB
/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...	795.0 KiB
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	476.6 KiB
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	452.8 KiB
www.uam.es/uam/media/img/1606928370518/infografia-consumo-19-5-23.svg	405.4 KiB
www.uam.es/uam/media/img/1606995215633/portada-23-24.svg	217.5 KiB
www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg	183.6 KiB
/uam/media/imgm/1607032085952/purple-orange-modern-abstra...	178.5 KiB
www.googletagmanager.com/gtag/js?id=G-5TG18SW503	176.5 KiB
www.googletagmanager.com/gtag/js?id=AW-17987922144	143.4 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
Logotipo Universia `ul.justify-content-center > li.uam-partner-logo > a.out > img`	www.uam.es/uam/media/img/1606848841888/universia-logo-color-01.png
Logotipo Santander Universidades `ul.justify-content-center > li.uam-partner-logo > a.out > img`	www.uam.es/uam/media/img/1606848842005/santander-logo-color-01.png
Logotipo HRS4R `ul.justify-content-center > li.uam-partner-logo > a > img`	www.uam.es/uam/media/img/1606848842439/hr-logo-color-01.png
Logotipo Fundación Universidad Empresa `ul.justify-content-center > li.uam-partner-logo > a.out > img`	www.uam.es/uam/media/img/1606848842193/fue-logo-color-01.png
Infografía titulada Des[con]ecta la luz; [con]ecta con el planeta, que incluye … `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/img/1606928370518/infografia-consumo-19-5-23.svg
Logotipo de la iniciativa UAM ante crisis humanitarias, con texto Donaciones `div.uam-media-container > a.lightbox > picture > img.uam-media`	/uam/media/imgm/1606937915229/imagenuamantecrisishumanita...
Imagen promocional de la UAM. / UAM `div.col-md-6 > div.uam-media-container > picture > img.uam-media`	/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...
kroshka__nastya/Freepik `div.col-md-6 > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgl/1607033349710/2026-04-21-gonzalez-beltran-img.jpg
Portada del anuario La UAM EN CIFRAS 2025 `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/img/1606995215633/portada-23-24.svg
Universidad Autónoma de Madrid `div.container > div.uam-logo-mobile > a > img`	www.uam.es/uam/media/img/1606893866850/uam-solo.svg
Imagen que muestra a una estudiante tomando notas frente a un ordenador `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/imgm/1606903067572/fotoccd.jpg
Banner para anunciar la agenda semanal `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/imgm/1606859313941/banner-agenda-2024.jpg
Logotipo Parque Científico Madrid `ul.justify-content-center > li.uam-partner-logo > a.out > img`	www.uam.es/uam/media/img/1606957595533/parquecientifico.png

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

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 10 user timings

●Avoid long main-thread tasks 15 long tasks found

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 170 ms

●Server Backend Latencies 30 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 190 ms

●Avoid large layout shifts 15 layout shifts found

○INP breakdown

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.

ARIA

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
La UAM `div.uam-footer-menu > ul#uam-footer-accordion > li.accordion-item > div.accordion-header`
Vida universitaria `div.uam-footer-menu > ul#uam-footer-accordion > li.accordion-item > div.accordion-header`
Información para... `div.uam-footer-menu > ul#uam-footer-accordion > li.accordion-item > div.accordion-header`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Navigation

A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
nuestra política de cookies. `div.cookies-wrapper > div.cookies-text > p > a.cookies-link`
Aceptar `div#cookies-policy > div.cookies-wrapper > div.cookies-close > button.cookies-close-button`

These are opportunities to improve keyboard navigation in your application.

○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-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

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●`[accesskey]` values are unique

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

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

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

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

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

●Elements with visible text labels have matching accessible names.

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

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

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

○Input buttons have discernible text.

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

○Form elements have associated labels

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

○`<object>` elements have alternate text

○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.

○`[lang]` attributes have a valid value

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

○All heading elements contain content.

○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.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

100

SEO

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

100

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.

3.05 s

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

3.83 s

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

38 ms

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

0.012

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

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.

4.74 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
/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...	0.0 ms	796.9 KiB
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	0.0 ms	476.6 KiB
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	0.0 ms	452.8 KiB
www.uam.es/uam/media/img/1606928370518/infografia-consumo-19-5-23.svg	0.0 ms	405.4 KiB
www.uam.es/uam/media/img/1606995215633/portada-23-24.svg	0.0 ms	217.5 KiB
www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg	0.0 ms	183.6 KiB
www.uam.es/uam/media/imgm/1607033349710/2026-04-21-gonzalez-beltran-img.jpg	0.0 ms	51.9 KiB
/uam/media/imgs/1607032085952/purple-orange-modern-abstra...	0.0 ms	50.1 KiB
www.uam.es/uam/media/imgm/1606903067572/fotoccd.jpg	0.0 ms	40.0 KiB
/uam/media/imgm/1606937915229/imagenuamantecrisishumanita...	0.0 ms	38.1 KiB
www.uam.es/estaticos/UAM-R/js/wcs.js?v=13	0.0 ms	27.7 KiB
www.uam.es/uam/media/imgm/1606859313941/banner-agenda-2024.jpg	0.0 ms	19.8 KiB
www.uam.es/uam/media/imgs/1607031525181/1.-mesa-de-portavoces-ceuam-2026.jpeg	0.0 ms	19.3 KiB
www.uam.es/uam/media/img/1606893064532/marcauam-ahorizontalcolor-imp.svg	0.0 ms	16.9 KiB
www.uam.es/uam/media/imgs/1607032400126/voluntariado-web.jpg	0.0 ms	16.7 KiB
www.uam.es/uam/media/imgs/1607032375722/fifimac.jpg	0.0 ms	16.4 KiB
www.uam.es/uam/media/imgs/1607033328935/jpa.jpg	0.0 ms	14.0 KiB
ssl.google-analytics.com/ga.js	7200.0 s	17.4 KiB
www.uam.es/uam/media/img/1606848842005/santander-logo-color-01.png	0.0 ms	12.0 KiB
www.uam.es/uam/media/img/1606848842193/fue-logo-color-01.png	0.0 ms	11.5 KiB
www.uam.es/uam/media/imgs/1607032078382/2026-04-16-arnanz-csic.jpg	0.0 ms	11.1 KiB
www.uam.es/estaticos/Comun/fonts/uam-icons/uam-icons.woff2?51217462	0.0 ms	7.7 KiB
www.uam.es/uam/media/imgs/1607032075390/2026-04-14-suderov-ifimac-img.jpg	0.0 ms	7.4 KiB
www.uam.es/uam/media/imgs/1607032081544/2026-04-17-barbera-rjb-jpg.jpg	0.0 ms	7.2 KiB
www.uam.es/uam/media/img/1606848842439/hr-logo-color-01.png	0.0 ms	6.4 KiB
www.uam.es/uam/media/img/1606957595533/parquecientifico.png	0.0 ms	5.7 KiB
www.uam.es/uam/media/img/1606848841888/universia-logo-color-01.png	0.0 ms	5.3 KiB
www.uam.es/uam/media/img/1606893866850/uam-solo.svg	0.0 ms	3.1 KiB
www.uam.es/estaticos/UAM-R/js/analytics.js?v=13	0.0 ms	1.9 KiB
www.uam.es/estaticos/UAM-R/videos/video-home.mp4	0.0 ms	0 B

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.uam.es/estaticos/Comun/fonts/uam-icons/uam-icons.woff2?51217462	175 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:49.211 source:map[column:52 line:996 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 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:36.824 source:map[column:376 line:843 type:source-location url:https://www.googletagmanager.com/gtag/js?id=G-5TG18SW503 urlProvider:network]] map[reflowTime:121.951 source:map[type:text value:[unattributed]]] map[reflowTime:0.468 source:map[column:31 line:1784 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:0.282 source:map[column:31 line:1785 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:0.242 source:map[column:31 line:1786 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:41.655 source:map[column:42 line:1764 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:1.04 source:map[column:104 line:2947 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:0.465 source:map[column:59 line:1816 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]] map[reflowTime:5.059 source:map[column:66 line:1764 type:source-location url:https://www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13 urlProvider:network]]]

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.uam.es/uam/inicio	http/1.1
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	http/1.1
www.uam.es/estaticos/UAM-R/js/wcs.js?v=13	http/1.1
www.uam.es/estaticos/UAM-R/js/analytics.js?v=13	http/1.1
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	http/1.1
www.uam.es/uam/media/img/1606893064532/marcauam-ahorizontalcolor-imp.svg	http/1.1
www.uam.es/uam/media/img/1606893866850/uam-solo.svg	http/1.1
www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg	http/1.1
/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...	http/1.1
www.uam.es/uam/media/imgs/1607033328935/jpa.jpg	http/1.1
www.uam.es/uam/media/imgs/1607032375722/fifimac.jpg	http/1.1
www.uam.es/uam/media/imgs/1607032400126/voluntariado-web.jpg	http/1.1
www.uam.es/uam/media/imgs/1607031525181/1.-mesa-de-portavoces-ceuam-2026.jpeg	http/1.1
www.uam.es/uam/media/imgm/1607033349710/2026-04-21-gonzalez-beltran-img.jpg	http/1.1
www.uam.es/uam/media/imgs/1607032081544/2026-04-17-barbera-rjb-jpg.jpg	http/1.1
www.uam.es/uam/media/imgs/1607032078382/2026-04-16-arnanz-csic.jpg	http/1.1
/uam/media/imgs/1607032085952/purple-orange-modern-abstra...	http/1.1
www.uam.es/uam/media/imgs/1607032075390/2026-04-14-suderov-ifimac-img.jpg	http/1.1
www.uam.es/uam/media/imgm/1606859313941/banner-agenda-2024.jpg	http/1.1
www.uam.es/uam/media/img/1606995215633/portada-23-24.svg	http/1.1
/uam/media/imgm/1606937915229/imagenuamantecrisishumanita...	http/1.1
www.uam.es/uam/media/imgm/1606903067572/fotoccd.jpg	http/1.1
www.uam.es/estaticos/UAM-R/videos/video-home.mp4	http/1.1
www.uam.es/uam/media/img/1606928370518/infografia-consumo-19-5-23.svg	http/1.1
www.uam.es/uam/media/img/1606848842193/fue-logo-color-01.png	http/1.1
www.uam.es/uam/media/img/1606848842439/hr-logo-color-01.png	http/1.1
www.uam.es/uam/media/img/1606957595533/parquecientifico.png	http/1.1
www.uam.es/uam/media/img/1606848841888/universia-logo-color-01.png	http/1.1
www.uam.es/uam/media/img/1606848842005/santander-logo-color-01.png	http/1.1
www.uam.es/estaticos/Comun/fonts/uam-icons/uam-icons.woff2?51217462	http/1.1
www.uam.es/estaticos/UAM-R/images/favicon.ico	http/1.1

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

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

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
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	452.8 KiB	781 ms
ssl.google-analytics.com/ga.js	17.4 KiB	248 ms
/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,7...	2.9 KiB
fonts.googleapis.com/css?family=Playfair+Display&display=swap	640 B	209 ms

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
Imagen promocional de la UAM. / UAM `div.col-md-6 > div.uam-media-container > picture > img.uam-media`	/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...	791.6 KiB	763.7 KiB
body > div.hero-banner > div.hero-banner-img-wrapper > video#uam-video-background `body > div.hero-banner > div.hero-banner-img-wrapper > video#uam-video-background`	www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg	181.7 KiB	86.1 KiB
Portal con los podcasts que se crean en la UAM `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	/uam/media/imgs/1607032085952/purple-orange-modern-abstra...	49.1 KiB	42.7 KiB
kroshka__nastya/Freepik `div.col-md-6 > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607033349710/2026-04-21-gonzalez-beltran-img.jpg	51.0 KiB	29.6 KiB
Imagen que muestra a una estudiante tomando notas frente a un ordenador `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/imgm/1606903067572/fotoccd.jpg	39.0 KiB	22.7 KiB
Logotipo de la iniciativa UAM ante crisis humanitarias, con texto Donaciones `div.uam-media-container > a.lightbox > picture > img.uam-media`	/uam/media/imgm/1606937915229/imagenuamantecrisishumanita...	37.1 KiB	21.6 KiB
Adrián Vayas Gallego, derecha, junto al resto de los miembros de la nueva mesa … `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgs/1607031525181/1.-mesa-de-portavoces-ceuam-2026.jpeg	18.4 KiB	9.1 KiB
Imagen de grupo ante el stand de la Oficina de Acción Solidaria de la UAM. `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgs/1607032400126/voluntariado-web.jpg	15.9 KiB	6.6 KiB
De izquierda a derecha: Enrique García Michel, Rubén Pérez, la rectora Amaya Me… `div.news-card-clickable > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgs/1607032375722/fifimac.jpg	15.6 KiB	6.3 KiB

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: 725 ms

URL	Time Spent
uam.es/	725 ms
www.uam.es/uam/inicio	0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

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: 230 ms 413.8 KiB

URL	Transfer Size	Est Savings
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	452.5 KiB	413.8 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: 40 ms 540.3 KiB

URL	Transfer Size	Est Savings
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	476.2 KiB	319.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-5C3C3B3	138.8 KiB	70.8 KiB
www.googletagmanager.com/gtag/js?id=G-5TG18SW503	176.2 KiB	68.0 KiB
www.googletagmanager.com/gtag/js?id=AW-17987922144	143.2 KiB	57.1 KiB
www.uam.es/estaticos/UAM-R/js/wcs.js?v=13	27.3 KiB	24.8 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 169.1 KiB

URL	Transfer Size	Est Savings
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	476.3 KiB	165.0 KiB
www.uam.es/estaticos/UAM-R/js/wcs.js?v=13	27.3 KiB	4.1 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.uam.es/estaticos/UAM-R/videos/video-home.mp4	4.2 MiB
/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...	796.9 KiB
www.uam.es/estaticos/UAM-R/js/scripts.min.js?v=13	476.6 KiB
www.uam.es/estaticos/UAM-R/css/uam.min.css?v=13	452.8 KiB
www.uam.es/uam/media/img/1606928370518/infografia-consumo-19-5-23.svg	405.4 KiB
www.uam.es/uam/media/img/1606995215633/portada-23-24.svg	217.5 KiB
www.uam.es/uam/media/imgxl/1606852113446/pm2-1920x750.jpg	183.6 KiB
www.googletagmanager.com/gtag/js?id=G-5TG18SW503	176.5 KiB
www.googletagmanager.com/gtag/js?id=AW-17987922144	143.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-5C3C3B3	138.8 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
Universidad Autónoma de Madrid `div.container > div.uam-logo > a > img`	www.uam.es/uam/media/img/1606893064532/marcauam-ahorizontalcolor-imp.svg
Infografía titulada Des[con]ecta la luz; [con]ecta con el planeta, que incluye … `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/img/1606928370518/infografia-consumo-19-5-23.svg
Logotipo de la iniciativa UAM ante crisis humanitarias, con texto Donaciones `div.uam-media-container > a.lightbox > picture > img.uam-media`	/uam/media/imgm/1606937915229/imagenuamantecrisishumanita...
Logotipo Universia `ul.justify-content-center > li.uam-partner-logo > a.out > img`	www.uam.es/uam/media/img/1606848841888/universia-logo-color-01.png
Logotipo Santander Universidades `ul.justify-content-center > li.uam-partner-logo > a.out > img`	www.uam.es/uam/media/img/1606848842005/santander-logo-color-01.png
Logotipo HRS4R `ul.justify-content-center > li.uam-partner-logo > a > img`	www.uam.es/uam/media/img/1606848842439/hr-logo-color-01.png
Logotipo Fundación Universidad Empresa `ul.justify-content-center > li.uam-partner-logo > a.out > img`	www.uam.es/uam/media/img/1606848842193/fue-logo-color-01.png
Imagen promocional de la UAM. / UAM `div.col-md-6 > div.uam-media-container > picture > img.uam-media`	/uam/media/imgm/1607029033883/la-uam-en-el-top-100mejores...
kroshka__nastya/Freepik `div.col-md-6 > div.uam-media-container > picture > img.uam-media`	www.uam.es/uam/media/imgm/1607033349710/2026-04-21-gonzalez-beltran-img.jpg
Portada del anuario La UAM EN CIFRAS 2025 `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/img/1606995215633/portada-23-24.svg
Imagen que muestra a una estudiante tomando notas frente a un ordenador `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/imgm/1606903067572/fotoccd.jpg
Banner para anunciar la agenda semanal `div.uam-media-container > a.lightbox > picture > img.uam-media`	www.uam.es/uam/media/imgm/1606859313941/banner-agenda-2024.jpg
Logotipo Parque Científico Madrid `ul.justify-content-center > li.uam-partner-logo > a.out > img`	www.uam.es/uam/media/img/1606957595533/parquecientifico.png

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

●Max Potential First Input Delay 80 ms

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 10 user timings

●JavaScript execution time 0.4 s

●Minimizes main-thread work 1.2 s

●Avoid long main-thread tasks 3 long tasks found

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 170 ms

●Server Backend Latencies 40 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 180 ms

●Avoid large layout shifts 15 layout shifts found

○INP breakdown

○LCP request discovery

Accessibility

ARIA

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
La UAM `div.uam-footer-menu > ul#uam-footer-accordion > li.accordion-item > div.accordion-header`
Vida universitaria `div.uam-footer-menu > ul#uam-footer-accordion > li.accordion-item > div.accordion-header`
Información para... `div.uam-footer-menu > ul#uam-footer-accordion > li.accordion-item > div.accordion-header`

Focusable descendents within an `[aria-hidden="true"]` element prevent those interactive elements from being available to users of assistive technologies like screen readers. Learn how `aria-hidden` affects focusable elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Actualidad La UAM celebra su Día de Puertas Abiertas 2026 La UAM celebra su D… `div.uam-news > div.container > div.row > div.news-card`
Actualidad La UAM constituye la Fundación Centro de Investigación Física de la… `div.uam-news > div.container > div.row > div.news-card`
Actualidad La UAM celebra su I Feria del Voluntariado y anima a imaginar que “… `div.uam-news > div.container > div.row > div.news-card`
Actualidad Adrián Vayas Gallego, nuevo portavoz del Consejo de Estudiantes de … `div.uam-news > div.container > div.row > div.news-card`
Investigación Descubren Ewangoa, un nuevo género de plantas nativo de África C… `div.uam-news > div.container > div.row > div.news-card`
Investigación El 22% de las lagunas temporales de la Península Ibérica ha desa… `div.uam-news > div.container > div.row > div.news-card`
Actividades culturales Nuevo portal de podcasts divulgativos de la UAM Nuevo … `div.uam-news > div.container > div.row > div.news-card`
Investigación Revelan cómo mínimas impurezas magnéticas alteran la superconduc… `div.uam-news > div.container > div.row > div.news-card`
Comunicado 06/03/2026 Manifiesto de CRUE con motivo del Día Internacional de … `div.uam-releases > div.container > div.row > div.col-lg-3`
Comunicado 03/03/2026 Valoración de CRUMA del Acuerdo de Financiación Plurian… `div.uam-releases > div.container > div.row > div.col-lg-3`
Comunicado de la CRUE 15/01/2026 CRUE expresa su firme condena ante la interv… `div.uam-releases > div.container > div.row > div.col-lg-3`
Comunicado de la CRUE 27/05/2025 Por el cese de la violencia en Gaza y el res… `div.uam-releases > div.container > div.row > div.col-lg-3`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Navigation

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
nuestra política de cookies. `div.cookies-wrapper > div.cookies-text > p > a.cookies-link`
Aceptar `div#cookies-policy > div.cookies-wrapper > div.cookies-close > button.cookies-close-button`

These are opportunities to improve keyboard navigation in your application.

○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-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

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

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

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●`[accesskey]` values are unique

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

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

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

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

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

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

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

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

○Input buttons have discernible text.

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

○Form elements have associated labels

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

○`<object>` elements have alternate text

○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.

○`[lang]` attributes have a valid value

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

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

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

○Identical links have the same purpose.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

100

SEO

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Results for https://uam.es

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Fix Priority Matrix

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What fixing these means

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