Lighthouse Desktop

· 0 checks — Desktop 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.

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
fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2	130 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	90 ms

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: Crashlytics illustration

path: 1,HTML,1,BODY,2,SECTION,6,SECTION,0,MAIN,1,DEVSITE-CONTENT,0,ARTICLE,4,DIV,0,MAIN,0,DIV,0,SECTION,0,HEADER,1,DIV,0,IMG

selector: section#track-prioritize-and-fix-app-crashes-faster > header.product-header-new__wrapper > div.product-header-new__illo > img

snippet: <img alt="Crashlytics illustration" aria-hidden="true" class="" role="presentation" src="/static/images/products/crashlytics/crashlytics-hero_1x.png" srcset="https://firebase.google.com/static/images/products/crashlytics/crashlytics…">

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

title: Preconnected origins

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

title: Preconnect candidates

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eab...	154.1 KiB	463 ms
fonts.googleapis.com/css?family=Google+Sans:400,500,600,700	2.4 KiB
/css2?family=JetBrains+Mono:ital,wght@0,100..800;1,100..8...	799 B
/css?family=Google+Sans:400,500\|Roboto:400,400italic,500,...	3.2 KiB	327 ms
/css2?family=Material+Icons&family=Material+Symbols+Outli...	984 B	74 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
Integrate into your existing workflow `div.side-side-wrapper__left-container > div.content > div.content__illo > img`	/static/images/products/crashlytics/Firebase_Crashlytics_...	104.6 KiB	65.6 KiB
Crashlytics illustration `section#track-prioritize-and-fix-app-crashes-faster > header.product-header-new__wrapper > div.product-header-new__illo > img`	firebase.google.com/static/images/products/crashlytics/crashlytics-hero_1x.png	116.6 KiB	56.4 KiB
Spend less time troubleshooting crashes and ANRs `div.side-side-wrapper__right-container > div.content > div.content__illo > img`	/static/images/products/crashlytics/Crashlytics_SolveCras...	84.7 KiB	45.5 KiB
Pomelo logo `div.carousel__container > div.carousel__slide > div.carousel__image-wrapper > img`	firebase.google.com/static/images/usecases/pomelo_logo_horizontal.png	17.2 KiB	16.0 KiB
Alerts `div.three-column__wrapper > div.three-column__column > div.three-column__column-image > img`	firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature03.png	28.8 KiB	14.7 KiB
Gameloft logo `div.carousel__container > div.carousel__slide > div.carousel__image-wrapper > img`	firebase.google.com/static/images/usecases/gameloft.png	10.4 KiB	10.4 KiB
Debug faster with contextual information about crashes `div.side-side-wrapper__right-container > div.content > div.content__illo > img`	/static/images/products/crashlytics/Crashlytics_PowerfulI...	47.1 KiB	8.1 KiB
Realtime release monitoring `div.three-column__wrapper > div.three-column__column > div.three-column__column-image > img`	firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature01.png	21.8 KiB	7.8 KiB
STAGE logo `div.carousel__container > div.carousel__slide > div.carousel__image-wrapper > img`	firebase.google.com/static/images/usecases/stage-app.png	7.0 KiB	4.1 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: 223 ms

URL	Time Spent
crashlytics.com/	223 ms
firebase.google.com/products/crashlytics/	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: 608 ms

URL	Time Spent
firebase.google.com/products/crashlytics/	708 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: 110 ms 198.7 KiB

URL	Transfer Size	Est Savings
/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eab...	154.0 KiB	136.0 KiB
/* Styles inlined from /styles/main.css */ @font-face{font-family:'GMP Icons'; … } …	65.3 KiB	62.7 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: 30 ms 397.6 KiB

URL	Transfer Size	Est Savings
/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eab...	302.7 KiB	163.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-KFPLMHC	155.7 KiB	84.6 KiB
www.googletagmanager.com/gtag/js?id=G-64EQFFKSHW&l=atDataLayer&cx=c&gtm=4e64f0	143.4 KiB	61.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-NDV7K7V5&l=atDataLayer	131.4 KiB	60.5 KiB
/devrel-devsite/prod/v2f052e0cca7362dede225b85c12aee59eab...	58.4 KiB	27.3 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
Gameloft logo `div.carousel__container > div.carousel__slide > div.carousel__image-wrapper > img`	firebase.google.com/static/images/usecases/gameloft.png
Crashlytics illustration `section#track-prioritize-and-fix-app-crashes-faster > header.product-header-new__wrapper > div.product-header-new__illo > img`	firebase.google.com/static/images/products/crashlytics/crashlytics-hero_1x.png
Spend less time troubleshooting crashes and ANRs `div.side-side-wrapper__right-container > div.content > div.content__illo > img`	/static/images/products/crashlytics/Crashlytics_SolveCras...
Integrate into your existing workflow `div.side-side-wrapper__left-container > div.content > div.content__illo > img`	/static/images/products/crashlytics/Firebase_Crashlytics_...
Debug faster with contextual information about crashes `div.side-side-wrapper__right-container > div.content > div.content__illo > img`	/static/images/products/crashlytics/Crashlytics_PowerfulI...
Pomelo logo `div.carousel__container > div.carousel__slide > div.carousel__image-wrapper > img`	firebase.google.com/static/images/usecases/pomelo_logo_horizontal.png
Get AI-powered insights and troubleshooting tips with Gemini in Firebase `div.block__content > div.content > div.content__illo > img`	/static/images/products/crashlytics/Crashlytics_GeminiPow...
STAGE logo `div.carousel__container > div.carousel__slide > div.carousel__image-wrapper > img`	firebase.google.com/static/images/usecases/stage-app.png

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

●Use efficient cache lifetimes

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 50 ms

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 1,735 KiB

●User Timing marks and measures 13 user timings

●JavaScript execution time 0.2 s

●Minimizes main-thread work 0.7 s

●Avoid long main-thread tasks 1 long task found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 70 ms

●Server Backend Latencies 260 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid large layout shifts 3 layout shifts found

○INP breakdown

○Avoid non-composited animations

Accessibility

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

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
STAGE uses Firebase and Flutter to cut release time in half `section#eyebrow-case-studies-heading-learn-how-crashlytics-helps-teams-across-the-world-improve-app-quality-n > div.carousel__container > div.carousel__slide > h5#stage-uses-firebase-and-flutter-to-cut-release-time-in-half`

These are opportunities to improve keyboard navigation in your application.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
More `devsite-tabs.upper-tabs > nav.devsite-tabs-wrapper > tab.devsite-overflow-tab > button#tab-overflow-button-xk75`

○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

●Form elements have associated labels

●`[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 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

●Touch targets have sufficient size and spacing.

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

○`[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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○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.

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

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

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

Best Practices

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.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
Realtime release monitoring `div.three-column__wrapper > div.three-column__column > div.three-column__column-image > img`	firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature01.png	310 x 193 (1.61)	392 x 220 (1.78)
Custom logging & breadcrumbs `div.three-column__wrapper > div.three-column__column > div.three-column__column-image > img`	firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature02.png	310 x 193 (1.61)	393 x 220 (1.79)
Alerts `div.three-column__wrapper > div.three-column__column > div.three-column__column-image > img`	firebase.google.com/static/images/products/crashlytics/Crashlytics_Feature03.png	310 x 193 (1.61)	393 x 220 (1.79)

●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 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

○Ensure CSP is effective against XSS attacks

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

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
policies.google.com/technologies/cookies?hl=en	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`