Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

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.

Request	Cache TTL	Transfer Size
wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js	300.0 s	273.7 KiB
uhf.microsoft.com/statics/20260421.16.02/css/style-BpAANDpw.css	0.0 ms	226.0 KiB
js.monitor.azure.com/scripts/b/ai.3.min.js	1800.0 s	66.6 KiB
js.monitor.azure.com/scripts/c/ms.analytics-web-4.min.js	1800.0 s	59.9 KiB
uhf.microsoft.com/statics/20260421.16.02/js/index-Cifsy-6O.js	0.0 ms	31.4 KiB
uhf.microsoft.com/images/microsoft/RE1Mu3b.png	0.0 ms	4.2 KiB
uhf.microsoft.com/statics/20260421.16.02/js/entry.js	0.0 ms	1.8 KiB

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:0.40738800000000003] map[node:map[boundingRect:map[bottom:7877 height:7288 left:0 right:412 top:589 width:412] lhId:page-1-DIV nodeLabel:ASP.NET Core Free. Cross-platform. Open source. A framework for building web a… path:1,HTML,1,BODY,5,DIV selector:body.ms-Fabric > div.main-container snippet:<div class="main-container" role="main" style="overflow: clip;"> type:node] score:0.407362] map[node:map[boundingRect:map[bottom:382 height:54 left:53 right:79 top:328 width:26] lhId:page-4-BUTTON nodeLabel:Search or ask a question path:1,HTML,1,BODY,2,DIV,0,UHF-HEADER,7,HEADER,0,DIV,0,DIV,6,UHF-SEARCH,2,BUTTON selector:div.uhf-header-l0 > div.uhf-header-l0__actions > uhf-search > button.uhf-nav-item snippet:<button class="uhf-nav-item uhf-nav-button uhf-search-button" data-m="{"Compnm": "UHF", "view": "UHF", "Pa": "UniversalSearch", "cN":"Search_nav…" aria-label="Search or ask a question"> type:node] score:2.6e-05]]

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.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

items: [map[duration:1576.657 label:Time to first byte subpart:timeToFirstByte] map[duration:1072.469 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-P

nodeLabel: Free. Cross-platform. Open source. A framework for building web apps and servic…

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

selector: div.main-container > div.jumbotron > div#mainContent > p.lead

snippet: <p class="lead">

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

value: No additional origins are good candidates for preconnecting

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
/static/css/bootstrap-custom.min.css?v=IftXf1dte1yxkBhZUa...	59.1 KiB	907 ms
/static/js/cookie-consent.min.js?v=cPwRYK_KXC_97Lbz_R3EFg...	3.5 KiB
js.monitor.azure.com/scripts/c/ms.analytics-web-4.min.js	59.9 KiB	1.4 s
uhf.microsoft.com/statics/20260421.16.02/css/style-BpAANDpw.css	226.0 KiB	2.4 s

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: 3.4 s

URL	Time Spent
asp.net/	1.0 s
www.asp.net/	2.4 s
dotnet.microsoft.com/en-us/apps/aspnet	0.0 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: 521 ms

URL	Time Spent
dotnet.microsoft.com/en-us/apps/aspnet	621 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
ASP.NET Core Free. Cross-platform. Open source. A framework for building web a… `body.ms-Fabric > div.main-container`	0.407
Search or ask a question `div.uhf-header-l0 > div.uhf-header-l0__actions > uhf-search > button.uhf-nav-item`	0.000

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: 1.4 s 276.7 KiB

URL	Transfer Size	Est Savings
uhf.microsoft.com/statics/20260421.16.02/css/style-BpAANDpw.css	225.8 KiB	222.1 KiB
/static/css/bootstrap-custom.min.css?v=IftXf1dte1yxkBhZUa...	58.6 KiB	54.6 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: 330 ms 101.1 KiB

URL	Transfer Size	Est Savings
/static/js/general.min.js?v=crDs_3gNR-ZIa2Eev4LJJO8V0OuAt...	69.3 KiB	51.2 KiB
js.monitor.azure.com/scripts/b/ai.3.min.js	65.6 KiB	27.9 KiB
js.monitor.azure.com/scripts/c/ms.analytics-web-4.min.js	58.9 KiB	22.0 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
Unattributable	460 ms	33 ms	0.0 ms
dotnet.microsoft.com/en-us/apps/aspnet	445 ms	24 ms	5.1 ms
/static/js/main.min.js?v=6VTgZMA9byKuNVNnUSMA8SzBB9MuqRoJ...	390 ms	333 ms	7.9 ms
uhf.microsoft.com/statics/20260421.16.02/js/index-Cifsy-6O.js	291 ms	189 ms	1.3 ms
js.monitor.azure.com/scripts/b/ai.3.min.js	268 ms	229 ms	29 ms
/static/js/cookie-consent.min.js?v=cPwRYK_KXC_97Lbz_R3EFg...	219 ms	214 ms	1.2 ms
/static/js/general.min.js?v=crDs_3gNR-ZIa2Eev4LJJO8V0OuAt...	145 ms	100 ms	40 ms
wcpstatic.microsoft.com/mscc/lib/v2/wcp-consent.js	78 ms	22 ms	54 ms
js.monitor.azure.com/scripts/c/ms.analytics-web-4.min.js	70 ms	38 ms	30 ms
uhf.microsoft.com/statics/20260421.16.02/css/style-BpAANDpw.css	58 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
Script Evaluation	1.2 s
Other	550 ms
Style & Layout	322 ms
Script Parsing & Compilation	173 ms
Parse HTML & CSS	166 ms
Rendering	90 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 7.1 KiB

URL	Transfer Size	Est Savings
uhf.microsoft.com/statics/20260421.16.02/js/index-Cifsy-6O.js	31.1 KiB	7.1 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
Microsoft `div > div > a.uhf-microsoft-logo > img`	uhf.microsoft.com/images/microsoft/RE1Mu3b.png

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

●Optimize DOM size

●Font display

●Forced reflow

●Improve image delivery

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Avoids enormous network payloads Total size was 1,258 KiB

●Avoid long main-thread tasks 11 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 80 ms

●Server Backend Latencies 620 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

Accessibility

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

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
Download PDF `div.col-lg-4 > ul.mt-auto > li > a#ebook-blazor-for-web-forms-devs-pdf`
View on the web `div.col-lg-4 > ul.mt-auto > li > a#ebook-blazor-for-web-forms-devs-web`
Download PDF `div.col-lg-4 > ul.mt-auto > li > a#ebook-aspnet-pdf`
View on the web `div.col-lg-4 > ul.mt-auto > li > a#ebook-aspnet-web`
Powered by .NET 10.0.7 `nav.uhf-footer-menu > ul > li > a#uhf-Powered by .NET 10.0.7`
Contact Microsoft `nav.uhf-footer-menu > ul > li > a#uhf-Contact Microsoft`
Support `nav.uhf-footer-menu > ul > li > a#uhf-Support`
Privacy & Cookies `nav.uhf-footer-menu > ul > li > a#uhf-Privacy & Cookies`
Manage cookies `nav.uhf-footer-menu > ul > li > a#uhf-Manage cookies`
Terms of Use `nav.uhf-footer-menu > ul > li > a#uhf-Terms of Use`
Trademarks `nav.uhf-footer-menu > ul > li > a#uhf-Trademarks`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

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

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

●`[role]` values are valid

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

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

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●`[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.

●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

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

●Heading elements appear in a sequentially-descending order

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

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

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

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

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

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

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

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

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

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

○ARIA IDs are unique

○No form fields have multiple labels

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

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

○Input buttons have discernible text.

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

○Form elements have associated labels

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

○`<object>` elements have alternate text

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

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

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

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

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

○Identical links have the same purpose.

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

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

Best Practices

General

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.

Source	Description
uhf.microsoft.com/statics/20260421.16.02/js/index-Cifsy-6O.js line 3092, col 16	`[UHF] Unable to load manage cookies button: Footer item with id uhf-Footer_ManageCookies not found`

●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 issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●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

○Use a strong HSTS policy

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 destination	Link Text
aka.ms/MS_Build_FY26_dotnet	Learn more

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●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`