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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

49

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

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
dls.uned.es/pumukit/5f846b735578f206017af437/67e15bf20874c80d9a05deb5.mp40.0 ms2.6 MiB
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s153.1 KiB
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s115.5 KiB
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s56.5 KiB
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s55.8 KiB
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s53.0 KiB
/signals/config/756878592234337?v=2.9.303&r=stable&domain...1200.0 s46.5 KiB
scripts.clarity.ms/0.8.60-beta/clarity.js0.0 ms25.0 KiB
/script/10872/webReader/ReadSpeaker.DocReader.AutoAdd.js?...0.0 ms3.3 KiB
/tr/?id=756878592234337&ev=PageView&dl=https%3A%2F%2Fwww....0.0 ms19 B
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...600.0 s0 B
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...600.0 s0 B
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...600.0 s0 B
/script/10872/webReader/webReader.js?pids=wr&dload=DocRea...0.0 ms0 B
/script/10872/webReader/r/r2605/ReadSpeaker.Styles-Button...86400.0 s0 B
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s0 B
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s0 B
/universidad/inicio/.resources/site-uned/webresources/fon...3600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...600.0 s0 B
/script/10872/webReader/ReadSpeaker.DocReader.AutoAdd.js?...0.0 ms0 B
/universidad/dam/jcr:ca43321b-2e8d-493a-bac2-e6a334552fc9...600.0 s0 B
/universidad/inicio/.resources/site-uned/webresources/img...3600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/50x170/dam/ini...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...600.0 s0 B
/universidad/.imaging/mte/home-nueva-theme/120/dam/recurs...600.0 s0 B
/universidad/dam/jcr:74c95238-645b-44ac-99d6-b740e75c4797...600.0 s0 B
/universidad/dam/jcr:8f607361-545c-4f72-ae2d-9af752ee46e3...600.0 s0 B
/universidad/dam/jcr:446c52f9-fc66-41ad-803d-6de24faaaacb...600.0 s0 B
/universidad/dam/jcr:e9e33f7e-6179-4cf5-8223-e50aea01d445...600.0 s0 B
www.uned.es/universidad/dam/jcr:4aea76de-acf5-458d-a1f5-f6f96e463a9b/estudia.svg600.0 s0 B
/universidad/dam/jcr:e4bc8051-8a11-4f6b-b2f9-32488d32f5be...600.0 s0 B
/universidad/dam/jcr:daacd8f6-73de-4ff5-8fec-51172aca4ee1...600.0 s0 B
/universidad/dam/jcr:6de2ffa4-e49f-4aec-b136-949460e2864f...600.0 s0 B
/universidad/.resources/site-uned/webresources/img/icons/...3600.0 s0 B
/universidad/inicio/.resources/site-uned/webresources/img...3600.0 s0 B
/universidad/dam/jcr:c7131d45-f6c0-4510-8855-a2045fe13bd3...600.0 s0 B
/universidad/dam/jcr:4b05d359-3a0a-447b-a0d6-cecaedd1fba3...600.0 s0 B
www.uned.es/universidad/.resources/site-uned/webresources/js/menu.js3600.0 s0 B
/universidad/inicio/.resources/site-uned/webresources/img...3600.0 s0 B
/universidad/.resources/site-uned/webresources/img/icons/...3600.0 s0 B
/universidad/.resources/site-uned/webresources/img/icons/...3600.0 s0 B
dls.uned.es/pumukit/5f846b735578f206017af437/67e15b929af72b605d024bf5.mp40.0 ms0 B

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-IMG
nodeLabel: becas ministerio
path: 1,HTML,1,BODY,5,MAIN,1,DIV,1,DIV,2,DIV,0,DIV,0,A,0,PICTURE,1,IMG
selector: div.carousel-item > a > picture.overflow-hidden > img
snippet: <img src="https://www.uned.es/universidad/.imaging/mte/home-nueva-theme/1080x1080/da…" alt="becas ministerio">

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.

URLProtocol
/universidad/inicio/.resources/site-uned/webresources/fon...http/1.1
/universidad/inicio/.resources/site-uned/webresources/fon...http/1.1
/universidad/inicio/.resources/site-uned/webresources/fon...http/1.1
/universidad/inicio/.resources/site-uned/webresources/fon...http/1.1
/universidad/inicio/.resources/site-uned/webresources/fon...http/1.1
www.uned.es/universidad/inicio/en/http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/fon...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-facultades/webresourc...http/1.1
/universidad/inicio/.resources/site-facultades/webresourc...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/site-uned/webresources/css...http/1.1
/universidad/inicio/.resources/common-module/webresources...http/1.1
/universidad/inicio/.resources/common-module/webresources...http/1.1
/universidad/inicio/.resources/common-module/webresources...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
/universidad/inicio/.resources/site-facultades/webresourc...http/1.1
/universidad/inicio/.resources/site-uned/webresources/js/...http/1.1
www.uned.es/universidad/.resources/site-uned/webresources/js/menu.jshttp/1.1
/universidad/.imaging/mte/home-nueva-theme/50x170/dam/ini...http/1.1
/universidad/.imaging/mte/home-nueva-theme/120/dam/recurs...http/1.1
/universidad/.resources/site-uned/webresources/img/icons/...http/1.1
/universidad/.resources/site-uned/webresources/img/icons/...http/1.1
/universidad/.resources/site-uned/webresources/img/icons/...http/1.1
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...http/1.1
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...http/1.1
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...http/1.1
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...http/1.1
/universidad/dam/jcr:6de2ffa4-e49f-4aec-b136-949460e2864f...http/1.1
/universidad/dam/jcr:e9e33f7e-6179-4cf5-8223-e50aea01d445...http/1.1
/universidad/dam/jcr:446c52f9-fc66-41ad-803d-6de24faaaacb...http/1.1
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...http/1.1
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...http/1.1
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...http/1.1
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...http/1.1
/universidad/dam/jcr:daacd8f6-73de-4ff5-8fec-51172aca4ee1...http/1.1
/universidad/dam/jcr:8f607361-545c-4f72-ae2d-9af752ee46e3...http/1.1
www.uned.es/universidad/dam/jcr:4aea76de-acf5-458d-a1f5-f6f96e463a9b/estudia.svghttp/1.1
/universidad/dam/jcr:c7131d45-f6c0-4510-8855-a2045fe13bd3...http/1.1
/universidad/dam/jcr:ca43321b-2e8d-493a-bac2-e6a334552fc9...http/1.1
/universidad/dam/jcr:74c95238-645b-44ac-99d6-b740e75c4797...http/1.1
/universidad/dam/jcr:4b05d359-3a0a-447b-a0d6-cecaedd1fba3...http/1.1
/universidad/dam/jcr:e4bc8051-8a11-4f6b-b2f9-32488d32f5be...http/1.1
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...http/1.1
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...http/1.1
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...http/1.1
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...http/1.1
/universidad/inicio/.resources/site-uned/webresources/img...http/1.1
/universidad/inicio/.resources/site-uned/webresources/img...http/1.1
/universidad/inicio/.resources/site-uned/webresources/img...http/1.1
www.uned.es/universidad/.resources/site-uned/webresources/img/favicon.pnghttp/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.

URLTransfer SizeDuration
fonts.googleapis.com/css?family=Asap:400,400italic,7000 B780 ms
/script/10872/webReader/webReader.js?pids=wr&dload=DocRea...0 B780 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
fonts.googleapis.com/css?family=Montserrat:400,7000 B
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/site-facultades/webresourc...0 B163 ms
/universidad/inicio/.resources/site-facultades/webresourc...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
/universidad/inicio/.resources/common-module/webresources...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B463 ms
/universidad/inicio/.resources/common-module/webresources...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/fon...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/common-module/webresources...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
/universidad/inicio/.resources/site-facultades/webresourc...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B463 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B463 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/js/...0 B163 ms
www.uned.es/universidad/.resources/site-uned/webresources/js/menu.js0 B163 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B463 ms
/universidad/inicio/.resources/site-uned/webresources/css...0 B463 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: 4.6 s
URLTime Spent
uned.es/755 ms
www.uned.es/759 ms
www.uned.es/universidad/inicio.html3.0 s
www.uned.es/universidad/inicio/en/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 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

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 620 ms 100.2 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-0LX353ZD5T&cx=c&gtm=4e64k1176.1 KiB70.1 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB30.1 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.

URLTotal CPU TimeScript EvaluationScript Parse
Unattributable827 ms106 ms0.0 ms
www.uned.es/universidad/inicio/en/349 ms17 ms3.6 ms
/script/10872/webReader/webReader.js?pids=wr&dload=DocRea...241 ms204 ms19 ms
/universidad/inicio/.resources/site-uned/webresources/js/...230 ms171 ms27 ms
www.googletagmanager.com/gtag/js?id=G-0LX353ZD5T&cx=c&gtm=4e64k1193 ms141 ms47 ms
/signals/config/756878592234337?v=2.9.303&r=stable&domain...185 ms146 ms15 ms
scripts.clarity.ms/0.8.60-beta/clarity.js181 ms167 ms6.4 ms
connect.facebook.net/en_US/fbevents.js168 ms134 ms31 ms
www.googletagmanager.com/gtm.js?id=GTM-MN4V7KH126 ms98 ms26 ms
www.uned.es/universidad/inicio.html81 ms7.4 ms2.9 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.

CategoryTime Spent
Script Evaluation1.2 s
Other778 ms
Style & Layout309 ms
Script Parsing & Compilation198 ms
Parse HTML & CSS115 ms
Rendering29 ms
Garbage Collection22 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 reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.Not 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 2.1 KiB
URLTransfer SizeEst Savings
/universidad/inicio/.resources/site-uned/webresources/css...6.8 KiB2.1 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.

URLTransfer Size
dls.uned.es/pumukit/5f846b735578f206017af437/67e15bf20874c80d9a05deb5.mp42.6 MiB
dls.uned.es/pumukit/5f846b735578f206017af437/67e15b929af72b605d024bf5.mp42.2 MiB
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...335.6 KiB
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...272.9 KiB
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...267.8 KiB
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...198.7 KiB
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...187.0 KiB
www.googletagmanager.com/gtag/js?id=G-0LX353ZD5T&cx=c&gtm=4e64k1176.1 KiB
/universidad/inicio/.resources/site-uned/webresources/fon...153.1 KiB
/universidad/.imaging/mte/home-nueva-theme/1080x1080/dam/...126.5 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
Egresados con sus bandas en la puerta de la Facultad de Educación de la UNED en… div.d-flex > div.image-container > a.image-container__image > img.card-img-top
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...
Patio de las instalaciones del IUGM en Madrid div.d-flex > div.image-container > a.image-container__image > img.card-img-top
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...
José Óscar Vila Chaves, vicerrector adjunto de la UNED, junto a Simond de Galb… div.d-flex > div.image-container > a.image-container__image > img.card-img-top
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...
Mesa con cuatro ponentes: De izda. a dcha.: Ana Lisbona, Mª Fe Rodríguez, María… div.d-flex > div.image-container > a.image-container__image > img.card-img-top
/universidad/.imaging/mte/home-nueva-theme/1920x1080/dam/...
Access to 2030 Agenda and SDG ul.featured-list > li.col-lg-3 > a.featured-list-item > img.list-item--img
/universidad/dam/jcr:74c95238-645b-44ac-99d6-b740e75c4797...
The Open European University div.col-lg-3 > div.patrocinado > a > img
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...
Acceso a EADTU div.col-lg-3 > div.patrocinado > a > img
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...
Acceso a la web Ministerio de Universidades div.col-lg-3 > div.patrocinado > a > img
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...
Access to Transparency Office ul.featured-list > li.col-lg-3 > a.featured-list-item > img.list-item--img
/universidad/dam/jcr:4b05d359-3a0a-447b-a0d6-cecaedd1fba3...
Access to Faculties and Schools ul.featured-list > li.col-lg-3 > a.featured-list-item > img.list-item--img
/universidad/dam/jcr:daacd8f6-73de-4ff5-8fec-51172aca4ee1...
Image of stacked books div.home-button--list > a.home-button--link > div.home-button > img
/universidad/dam/jcr:6de2ffa4-e49f-4aec-b136-949460e2864f...
Access to Electronic Office ul.featured-list > li.col-lg-3 > a.featured-list-item > img.list-item--img
/universidad/dam/jcr:c7131d45-f6c0-4510-8855-a2045fe13bd3...
Access to Associated Centers ul.featured-list > li.col-lg-3 > a.featured-list-item > img.list-item--img
/universidad/dam/jcr:8f607361-545c-4f72-ae2d-9af752ee46e3...
icon of a boy behind a laptop div.home-button--list > a.home-button--link > div.home-button > img
/universidad/dam/jcr:446c52f9-fc66-41ad-803d-6de24faaaacb...
Access to Library ul.featured-list > li.col-lg-3 > a.featured-list-item > img.list-item--img
/universidad/dam/jcr:e4bc8051-8a11-4f6b-b2f9-32488d32f5be...
Access to students ul.featured-list > li.col-lg-3 > a.featured-list-item > img.list-item--img
www.uned.es/universidad/dam/jcr:4aea76de-acf5-458d-a1f5-f6f96e463a9b/estudia.svg
Registration form image div.home-button--list > a.home-button--link > div.home-button > img
/universidad/dam/jcr:e9e33f7e-6179-4cf5-8223-e50aea01d445...
Access to Technology Center ul.featured-list > li.col-lg-3 > a.featured-list-item > img.list-item--img
/universidad/dam/jcr:ca43321b-2e8d-493a-bac2-e6a334552fc9...
Acceso a la web de Universia España div.col-lg-3 > div.patrocinado > a > img
/universidad/.imaging/mte/home-nueva-theme/285/dam/recurs...
RTVE UNED channel div.row-2 > div.campus > a > img
/universidad/.imaging/mte/home-nueva-theme/50x170/dam/ini...

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

●Layout shift culprits
●Document request latency
●Optimize DOM size
●Font display
●Forced reflow
●Improve image delivery
●LCP breakdown
●Optimize viewport for mobile
●Minify JavaScript
●Reduce unused CSS
●User Timing marks and measures 5 user timings
●Avoid long main-thread tasks 10 long tasks found
●Network Requests
●Network Round Trip Times 100 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 20 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○Avoid non-composited animations
93

Accessibility

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

Navigation

Access keys let users quickly focus a part of the page. For proper navigation, each access key must be unique. Learn more about access keys.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Help center div.d-flex > div.row-1 > div.campus > a#campusLink

These are opportunities to improve keyboard navigation in your application.

Best practices

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Destacado anterior main.container-fluid > div.row > div#carousel-uned4d045d9d-0249-464e-9fa9-344fa8f9d8e5 > a.carousel-control-prev
Siguiente destacado main.container-fluid > div.row > div#carousel-uned4d045d9d-0249-464e-9fa9-344fa8f9d8e5 > a.carousel-control-next

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]`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.
●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 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
●`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●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 an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○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
○Heading elements appear in a sequentially-descending order
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Form elements have associated labels
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○No element has a `[tabindex]` value greater than 0
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○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.
77

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 / WarningSource
AttributionReporting
connect.facebook.net/en_US/fbevents.js line 279, col 769

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
/universidad/inicio/.resources/site-uned/webresources/js/...
ReferenceError: PintarAutenticado is not defined at HTMLDocument.<anonymous> (https://www.uned.es/universidad/inicio/.resources/site-uned/webresources/js/auth~2026-03-18-08-22-06-740~cache.js:1:527)
/universidad/inicio/.resources/site-uned/webresources/js/...
ReferenceError: PintarAutenticado is not defined at HTMLDocument.<anonymous> (https://www.uned.es/universidad/inicio/.resources/site-uned/webresources/js/auth~2026-03-18-08-22-06-740~cache.js:1:527)
●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 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
92

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

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 destinationLink Text
www.uned.es/universidad/inicio/informacion.htmlMORE INFO
www.uned.es/universidad/inicio/en/informacion.htmlMORE INFO

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
●Document has a meta description
●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`

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