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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.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.127963] map[node:map[boundingRect:map[bottom:823 height:281 left:0 right:412 top:542 width:412] lhId:page-2-DIV nodeLabel:Your choices regarding the use of cookies on this site path:1,HTML,1,BODY,29,DIV,0,DIV selector:body.updated > div#pop-outerdiv09572915171168688 > div#pop-div207661802437580503 snippet:<div id="pop-div207661802437580503" class="truste_box_overlay"> type:node] score:0.122887] map[node:map[boundingRect:map[bottom:2746 height:1762 left:0 right:412 top:983 width:412] lhId:page-1-SECTION nodeLabel:Featured Your customized Red Hat Summit 2026 experience awaits Choose from key… path:1,HTML,1,BODY,4,DIV,0,ARTICLE,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,4,SECTION selector:div.one-column > div.dx-relative > div.rhdc-block__body > section.sub-hero snippet:<section class="sub-hero dx-band dx-pb-12" data-analytics-region="homepage-offer-card-featured"> type:node] score:0.005076]]

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.

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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:37.996 source:map[column:5 line:16 type:source-location url:https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 urlProvider:network]]]

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: Images of key Red Hat customers Turkish Airlines and Emirates NBD, overlaid wit…
path: 1,HTML,1,BODY,4,DIV,0,ARTICLE,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,1,DIV,2,DIV,1,SECTION,0,DIV,0,DIV,1,DIV,1,IMG
selector: div.dx-container-fluid > div.dx-row > div.dx-col-12 > img.dx-w-full
snippet: <img class="dx-w-full dx-block md:dx-hidden dx-ml-6" src="/rhdc/managed-files/RHDC-Campaign26-mobile.webp" alt="Images of key Red Hat customers Turkish Airlines and Emirates NBD, overlai…" width="768" height="auto" loading="eager">

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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
/defaultpreferencemanager/deferredjs/E657C59F77C9120AD964...0.0 ms129.7 KiB
/defaultpreferencemanager/E657C59F77C9120AD9647EAA88C9573...0.0 ms24.6 KiB
/defaultpreferencemanager/deferredjs/E657C59F77C9120AD964...0.0 ms12.1 KiB
/themes/custom/rhdc/src/fonts/red_hat_text/RedHatTextVFMo...104787.0 s29.8 KiB
consent-pref.trustarc.com/EuPreferenceManager.css0.0 ms7.4 KiB
www.redhat.com/akam/13/3ea9019d21600.0 s9.5 KiB
/notice?c=teconsent&pcookie&domain=redhat.com&gtm=1&js=nj...3600.0 s6.6 KiB
consent-st.trustarc.com/get?name=combined_static_cm_minified.js0.0 ms4.8 KiB
/c5eace8ae526/2bebe8987836/e6d73531ade7/RC3cf4ccee79674ce...3600.0 s4.5 KiB
www.redhat.com/ux/my-red-hat-elements/state.B1cuTi-v.js40865.0 s6.8 KiB
static.redhat.com/libs/@redhat/marketing/latest/rh.mktg.js86400.0 s7.6 KiB
consent-pref.trustarc.com/images/loading.gif0.0 ms3.0 KiB
/defaultpreferencemanager/deferredjs/E657C59F77C9120AD964...0.0 ms2.7 KiB
static.redhat.com/libs/redhat/marketing/latest/trustarc/trustecm/js/trustecm.js86400.0 s5.7 KiB
www.redhat.com/ux/dx-web/css/projects/homepage.min.css?tc3usf21361.0 s2.5 KiB
/rhdc/system-files/js/js__sTvVnyIh-dKv9kHsVyNBdVXEuWq8cXY...99265.0 s4.1 KiB
/ux/my-red-hat-elements/elements/myrh-promo-band/myrh-pro...21360.0 s1.6 KiB
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217151.0 s4.1 KiB
static.redhat.com/libs/redhat/marketing/latest/trustarc/trustarc.js86400.0 s2.5 KiB
consent-pref.trustarc.com/images/gpc-check.svg0.0 ms951 B
/defaultpreferencemanager/deferredjs/E657C59F77C9120AD964...0.0 ms910 B
www.redhat.com/ux/dx-web/js/projects/homepage.min.js?tc3usf21362.0 s1.2 KiB
www.redhat.com/ux/my-red-hat-elements/oidc-manager-controller.D7RlXzX3.js40865.0 s1.4 KiB
/c5eace8ae526/2bebe8987836/e6d73531ade7/RC43376b731ddd46c...3600.0 s830 B
/libs/redhat/marketing/latest/trustarc/trustecm/css/trust...86400.0 s1.4 KiB
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217135.0 s1.8 KiB
www.redhat.com/ux/dx-web/js/scripts.min.js?tc3usf86400.0 s1.1 KiB
www.redhat.com/ux/dx-web/css/projects/skeleton-loader.min.css?tc3usf86400.0 s1.0 KiB
www.redhat.com/ux/dx-web/css/projects/design-system-styles.min.css?tc3usf86400.0 s927 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s1.4 KiB
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217315.0 s1.4 KiB
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s1.2 KiB
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s1.0 KiB
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217151.0 s972 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217151.0 s853 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s851 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s847 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s760 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s689 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s611 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s598 B
/modules/contrib/red_hat_shared_libs/dist/rhds-elements/4...217150.0 s572 B

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Blue, layered interface cards over a background outlined in red and a cursor ic… div.dx-row > div.dx-col-12 > picture > img.dx-max-w-full
www.redhat.com/rhdc/managed-files/summit-ms3-graphic_mobile.webp26.0 KiB14.0 KiB
Red Hat Enterprise Linux icon div.rh-image-embed--component > div.rh-image-embed-container > div.rh-image-embed-span > img.rh-image-embed-img
www.redhat.com/rhdc/managed-files/RHEL-tech-icon-hybrid-style-v2_0.png13.5 KiB11.9 KiB
Red Hat AI icon div.rh-image-embed--component > div.rh-image-embed-container > div.rh-image-embed-span > img.rh-image-embed-img
www.redhat.com/rhdc/managed-files/AI-tech-icon-hybrid-style%402x-v2_0.webp9.6 KiB8.0 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: 1.0 s
URLTime Spent
redhat.com/1.0 s
www.redhat.com/en0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 972 ms
URLTime Spent
www.redhat.com/en1.1 s

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Your choices regarding the use of cookies on this site body.updated > div#pop-outerdiv09572915171168688 > div#pop-div207661802437580503
0.123
Featured Your customized Red Hat Summit 2026 experience awaits Choose from key… div.one-column > div.dx-relative > div.rhdc-block__body > section.sub-hero
0.005

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.

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: 0.0 ms 14.6 KiB
URLTransfer SizeEst Savings
/rhdc/system-files/css/css_GhzjmIYHwoAcLRTM9EeWH-YD9gdYAW...15.6 KiB14.6 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 150 ms 32.5 KiB
URLTransfer SizeEst Savings
www.redhat.com/dtm.js278.2 KiB32.5 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.

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
Other1.3 s
Script Evaluation1.3 s
Style & Layout858 ms
Rendering419 ms
Script Parsing & Compilation261 ms
Garbage Collection141 ms
Parse HTML & CSS134 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

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
Images of key Red Hat customers Turkish Airlines and Emirates NBD, overlaid wit… div.dx-container-fluid > div.dx-row > div.dx-col-12 > img.dx-w-full
www.redhat.com/rhdc/managed-files/RHDC-Campaign26-mobile.webp

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

●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●Avoids enormous network payloads Total size was 1,736 KiB
●User Timing marks and measures 18 user timings
●Avoid long main-thread tasks 10 long tasks found
●Avoid non-composited animations 2 animated elements found
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 490 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
○INP breakdown
97

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

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
div#pop-outerdiv09572915171168688 > div#pop-div207661802437580503 > div#pop-div305080814559014604 > iframe#pop-frame025590354404637383 div#pop-outerdiv09572915171168688 > div#pop-div207661802437580503 > div#pop-div305080814559014604 > iframe#pop-frame025590354404637383

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-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
●`[role]`s are contained by their required parent element
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●Select elements have associated label elements.
●`button`, `link`, and `menuitem` elements have accessible names
●ARIA attributes are used as specified for the element's role
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<frame>` or `<iframe>` elements have a title
●`<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.
●`[lang]` attributes have a valid value
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Form elements have associated labels
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○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.
96

Best Practices

User Experience

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
div.dx-col-12 > div.dx-hidden > div.brand-hero-ui-container > img.squoval-line div.dx-col-12 > div.dx-hidden > div.brand-hero-ui-container > img.squoval-line
www.redhat.com/rhdc/managed-files/squoval-line.webp600 x 319 (1.88)1841 x 997 (1.85)
Images of key Red Hat customers Turkish Airlines and Emirates NBD, overlaid wit… div.dx-container-fluid > div.dx-row > div.dx-col-12 > img.dx-w-full
www.redhat.com/rhdc/managed-files/RHDC-Campaign26-tablet.webp1100 x 924 (1.19)1536 x 924 (1.66)
div.dx-col-12 > div.dx-hidden > div.brand-hero-ui-container > img.turkish-airline-image div.dx-col-12 > div.dx-hidden > div.brand-hero-ui-container > img.turkish-airline-image
www.redhat.com/rhdc/managed-files/turkish-airline-img.webp562 x 345 (1.63)1156 x 690 (1.68)
div.dx-col-12 > div.dx-hidden > div.brand-hero-ui-container > img.small-solid-squoval div.dx-col-12 > div.dx-hidden > div.brand-hero-ui-container > img.small-solid-squoval
www.redhat.com/rhdc/managed-files/small-solid-squoval.webp369 x 230 (1.60)884 x 460 (1.92)

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●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
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
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

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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