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.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:0.119 source:map[column:1247 line:8 type:source-location url:https://www.airbnb.com/ urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:71.423 source:map[type:text value:[unattributed]]] map[reflowTime:0.119 source:map[column:1261 line:7 type:source-location url:https://www.airbnb.com/ urlProvider:network]] map[reflowTime:7.768 source:map[column:1119 line:15 type:source-location url:https://a0.muscache.com/airbnb/static/packages/web/common/frontend/core-guest-loop/apps/core-guest-spa/initializer.149a4a27a2.js urlProvider:network]] map[reflowTime:41.49 source:map[column:532 line:19 type:source-location url:https://a0.muscache.com/airbnb/static/packages/web/common/4fe2.b42c2589ea.js urlProvider:network]]]

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.

Request	Cache TTL	Transfer Size
d0a7e.airbnb.com/tags.js	1351.0 s	40.3 KiB
js.adsrvr.org/conversionEvents-v1.min.js	0.0 ms	12.2 KiB
d34r8q7sht0t9k.cloudfront.net/tag.js	0.0 ms	5.7 KiB
/tag?action=view&user_id=62a14177-f845-455c-99f0-abf77e60...	0.0 ms	238 B
/tr?id=674478425975295&ev=PageView&dl=https%3A%2F%2Fwww.a...	0.0 ms	19 B
/tr?id=674478425975295&ev=Contact&dl=https%3A%2F%2Fwww.ai...	0.0 ms	16 B

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: 304 ms

URL	Time Spent
airbnb.com/	304 ms
www.airbnb.com/	0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 240 ms 295.6 KiB

URL	Transfer Size	Est Savings
/airbnb/static/packages/web/common/frontend/core-guest-lo...	311.7 KiB	295.6 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: 40 ms 280.9 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c&gtm=4e64f0	164.5 KiB	63.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-46MK	175.3 KiB	52.2 KiB
/airbnb/static/packages/web/en/frontend/core-guest-loop/a...	99.2 KiB	28.7 KiB
a0.muscache.com/airbnb/static/packages/web/common/0a77.96fdfdbf95.js	52.8 KiB	24.4 KiB
a0.muscache.com/airbnb/static/packages/web/en/6497.465735c44e.js	35.9 KiB	24.3 KiB
/airbnb/static/packages/web/en/frontend/stays-search/rout...	36.0 KiB	23.4 KiB
a0.muscache.com/airbnb/static/packages/web/common/c3cb.0b3de42380.js	92.5 KiB	22.3 KiB
a0.muscache.com/airbnb/static/packages/web/en/cfe2.336203b1c1.js	46.3 KiB	22.1 KiB
a0.muscache.com/airbnb/static/packages/web/en/45b1.8d6dbd7700.js	55.1 KiB	20.1 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.

URL	Total CPU Time	Script Evaluation	Script Parse
www.airbnb.com/	718 ms	450 ms	1.2 ms
Unattributable	477 ms	32 ms	0.0 ms
a0.muscache.com/airbnb/static/packages/web/en/e77e.33160b3545.js	445 ms	362 ms	2.3 ms
a0.muscache.com/airbnb/static/packages/web/common/2ce9.b07975b17d.js	376 ms	234 ms	2.7 ms
www.googletagmanager.com/gtm.js?id=GTM-46MK	151 ms	137 ms	12 ms
a0.muscache.com/airbnb/static/packages/web/common/0a77.96fdfdbf95.js	150 ms	17 ms	3.0 ms
/airbnb/static/packages/web/en/frontend/homepage/routes/T...	110 ms	80 ms	4.0 ms
www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c&gtm=4e64f0	102 ms	86 ms	13 ms
/airbnb/static/packages/web/en/frontend/core-guest-loop/a...	93 ms	83 ms	7.2 ms
d0a7e.airbnb.com/tags.js	91 ms	70 ms	2.2 ms
a0.muscache.com/airbnb/static/packages/web/common/c3cb.0b3de42380.js	87 ms	78 ms	6.7 ms
/airbnb/static/packages/web/common/frontend/core-guest-lo...	83 ms	72 ms	0.5 ms
a0.muscache.com/airbnb/static/packages/web/en/bf69.14f185730e.js	51 ms	39 ms	1.8 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	2.1 s
Other	748 ms
Style & Layout	254 ms
Script Parsing & Compilation	180 ms
Garbage Collection	105 ms
Parse HTML & CSS	71 ms
Rendering	63 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 reason	Failure 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

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/airbnb/static/packages/web/common/frontend/core-guest-lo...	311.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-46MK	175.6 KiB
www.googletagmanager.com/gtag/js?id=G-2P6Q8PGG16&cx=c&gtm=4e64f0	164.6 KiB
a0.muscache.com/videos/search-bar-icons/webm/house-twirl-selected.webm	120.7 KiB
/airbnb/static/packages/web/en/frontend/airmetro/browser/...	110.8 KiB
/airbnb/static/packages/web/en/frontend/core-guest-loop/a...	99.2 KiB
www.airbnb.com/	98.3 KiB
a0.muscache.com/airbnb/static/packages/web/common/c3cb.0b3de42380.js	92.5 KiB
a0.muscache.com/videos/search-bar-icons/webm/balloon-twirl.webm	68.4 KiB
a0.muscache.com/videos/search-bar-icons/webm/house-selected.webm	62.5 KiB

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

●Max Potential First Input Delay 90 ms

●Layout shift culprits

●Optimize DOM size

●Font display

●Improve image delivery

●LCP breakdown

●LCP request discovery

●Modern HTTP

●Render blocking requests

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 19 user timings

●Avoid long main-thread tasks 7 long tasks found

●Image elements have explicit `width` and `height`

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 360 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 310 ms

●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.

ARIA

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

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
Apartment in Alfalfa Jul 10 – 12 , · Business host € 220 total € 220 total … `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Apartment in Seville Jul 10 – 12 , · Individual host € 303 total € 303 tota… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
See all `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Hotel American Palace From € 257 total € 257 total , · 4.77 out of 5 avera… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Mdm Guest House From € 369 total € 369 total , · 4.72 out of 5 average rat… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
See all `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Guest favorite Guest favorite Apartment in Saint-Mandé May 22 – 24 , · Busines… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Guest favorite Guest favorite Apartment in Paris May 1 – 3 , · Individual host… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
See all `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Guest favorite Guest favorite Vacation home in Rome Jun 19 – 21 , · Business h… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Guest favorite Guest favorite Apartment in Esquilino Jul 17 – 19 , · Individua… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
See all `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Room in Torremolinos Apr 17 – 19 , · Individual host € 115 total € 115 tota… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
Condo in Torremolinos Apr 17 – 19 , · Individual host € 246 total € 246 tot… `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`
See all `div.awuxh4x > div.cw9aemg > div.c14whb16 > div`

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

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
English (US) `div.lnah8cm > div.c1q8ecwv > span.bacnnrh > button.l1ovpqvx`
€ EUR `div.lnah8cm > div.c1q8ecwv > span.bacnnrh > button.l1ovpqvx`

○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

●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.

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

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

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

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

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

●Links 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.

●Heading elements appear in a sequentially-descending order

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

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

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

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

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

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

○ARIA IDs are unique

○No form fields have multiple labels

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

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

○Image elements have `[alt]` attributes

○Input buttons have discernible text.

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

○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.

○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.

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 / Warning	Source
AttributionReporting	d0a7e.airbnb.com/tags.js line 1, col 113441

●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 browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

100

SEO

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○Image elements have `[alt]` attributes