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
cdn.cookielaw.org/scripttemplates/202508.1.0/otBannerSdk.js	86400.0 s	120.0 KiB
/scripttemplates/otSDKStub.js?did=aa0c1c56-98fd-43ad-a88c...	86400.0 s	9.1 KiB
/a?v=3&t=l&pid=850679726&rv=64f0&tag_exp=0~115616986~1159...	0.0 ms	60 B

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:62.439 source:map[column:131013 line:1 type:source-location url:https://fast.wistia.com/assets/external/E-v1.js 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:62.439 source:map[column:94285 line:0 type:source-location url:https://fast.wistia.com/assets/external/E-v1.js urlProvider:network]] map[reflowTime:0.792 source:map[column:172565 line:1 type:source-location url:https://www.outbrain.com/script.js?version=4d2133b27bf2 urlProvider:network]] map[reflowTime:12.066 source:map[column:172608 line:1 type:source-location url:https://www.outbrain.com/script.js?version=4d2133b27bf2 urlProvider:network]] map[reflowTime:2.276 source:map[column:212149 line:1 type:source-location url:https://www.outbrain.com/script.js?version=4d2133b27bf2 urlProvider:network]] map[reflowTime:0.332 source:map[column:203905 line:1 type:source-location url:https://www.outbrain.com/script.js?version=4d2133b27bf2 urlProvider:network]]]

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
div.performance-cards > div.performance-cards__item > picture > img `div.performance-cards > div.performance-cards__item > picture > img`	www.outbrain.com/images/pages/home/performance__2.png	408.7 KiB	391.3 KiB
div.performance-cards > div.performance-cards__item > picture > img `div.performance-cards > div.performance-cards__item > picture > img`	www.outbrain.com/images/pages/home/performance__1.png	58.1 KiB	40.7 KiB
div.performance-cards > div.performance-cards__item > picture > img `div.performance-cards > div.performance-cards__item > picture > img`	www.outbrain.com/images/pages/home/performance__3.png	53.2 KiB	35.8 KiB
Outbrain Direct logo `div.header-inner > div.logo > a > img`	www.outbrain.com/images/logo-ob-direct.png	31.1 KiB	29.7 KiB
`header.hero > div.container > div.hero__inner > div.hero__display`	www.outbrain.com/images/pages/home/hero-main-image.png	249.6 KiB	23.5 KiB
div.performance-cards > div.performance-cards__item > picture > img `div.performance-cards > div.performance-cards__item > picture > img`	www.outbrain.com/images/pages/home/performance__4.png	36.1 KiB	18.8 KiB
main#main > section.partners > div.partners__inner > div.partners__inner-img `main#main > section.partners > div.partners__inner > div.partners__inner-img`	www.outbrain.com/images/pages/home/innovation_main_mobile.png	37.8 KiB	11.2 KiB
div.bottom-cta__inner > div.bottom-cta__inner-left > picture > img `div.bottom-cta__inner > div.bottom-cta__inner-left > picture > img`	www.outbrain.com/images/pages/home/bottom-cta-image-mobile.webp	32.2 KiB	9.4 KiB

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-8-HEADER

nodeLabel: Driving Performance, Elevating Outcomes We pioneered performance marketing on …

path: 1,HTML,1,BODY,3,MAIN,0,HEADER

selector: body > main#main > header.hero

snippet: <header class="hero">

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.

URL	Protocol
www.outbrain.com/	http/1.1
www.outbrain.com/style.css	http/1.1
www.outbrain.com/script.js	http/1.1
www.outbrain.com/fonts/icomoon/icomoon.woff2	http/1.1
www.outbrain.com/style.css?version=4d2133b27bf2	http/1.1
www.outbrain.com/assets/new-banner-close.png	http/1.1
www.outbrain.com/images/logo-ob-direct.png	http/1.1
www.outbrain.com/images/pages/home/performance__1.png	http/1.1
www.outbrain.com/images/pages/home/performance__2.png	http/1.1
www.outbrain.com/images/pages/home/performance__3.png	http/1.1
www.outbrain.com/images/pages/home/performance__4.png	http/1.1
www.outbrain.com/images/pages/home/ecoflow-circle.png	http/1.1
www.outbrain.com/images/pages/home/torras-circle.png	http/1.1
www.outbrain.com/images/pages/home/hipto-circle.png	http/1.1
www.outbrain.com/images/pages/home/bottom-cta-image-mobile.webp	http/1.1
www.outbrain.com/script.js?version=4d2133b27bf2	http/1.1
www.outbrain.com/images/pages/home/hero-bg-mobile.png	http/1.1
www.outbrain.com/images/pages/home/hero-main-image.png	http/1.1
www.outbrain.com/images/pages/home/partner-icon1.svg	http/1.1
www.outbrain.com/images/pages/home/partner-icon2.svg	http/1.1
www.outbrain.com/images/pages/home/partner-icon3.svg	http/1.1
www.outbrain.com/images/pages/home/innovation_main_mobile.png	http/1.1
www.outbrain.com/images/pages/home/performance-icon1.svg	http/1.1
www.outbrain.com/images/pages/home/performance-icon2.svg	http/1.1
www.outbrain.com/images/pages/home/performance-icon3.svg	http/1.1
www.outbrain.com/images/pages/home/performance-icon4.svg	http/1.1
www.outbrain.com/images/pages/home/quote.svg	http/1.1
www.outbrain.com/favicon.ico	http/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.

URL	Transfer Size	Duration
/css2?family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200...	1.1 KiB	812 ms
www.outbrain.com/style.css?version=4d2133b27bf2	18.2 KiB	760 ms

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.

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: 758 ms

URL	Time Spent
outbrain.com/	758 ms
www.outbrain.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

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: 150 ms 14.4 KiB

URL	Transfer Size	Est Savings
www.outbrain.com/style.css?version=4d2133b27bf2	17.6 KiB	14.4 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: 2.6 s 403.0 KiB

URL	Transfer Size	Est Savings
/assets/external/engines/hls_video.js@4a7b909604c9049f14b...	158.7 KiB	82.7 KiB
fast.wistia.com/assets/external/E-v1.js	161.6 KiB	78.9 KiB
cdn.cookielaw.org/scripttemplates/202508.1.0/otBannerSdk.js	119.9 KiB	74.0 KiB
www.outbrain.com/script.js?version=4d2133b27bf2	104.0 KiB	73.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-MNMBTC	181.9 KiB	72.7 KiB
browser.sentry-cdn.com/9.6.1/bundle.min.js	24.6 KiB	21.1 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
fast.wistia.com/assets/external/E-v1.js	1.7 s	1.2 s	126 ms
Unattributable	747 ms	145 ms	0.0 ms
/assets/external/engines/hls_video.js@4a7b909604c9049f14b...	737 ms	605 ms	4.1 ms
www.googletagmanager.com/gtm.js?id=GTM-MNMBTC	489 ms	399 ms	79 ms
www.outbrain.com/script.js?version=4d2133b27bf2	435 ms	237 ms	42 ms
cdn.cookielaw.org/scripttemplates/202508.1.0/otBannerSdk.js	192 ms	80 ms	67 ms
www.outbrain.com/	76 ms	7.4 ms	2.3 ms
/scripttemplates/otSDKStub.js?did=aa0c1c56-98fd-43ad-a88c...	52 ms	40 ms	3.9 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.

Category	Time Spent
Script Evaluation	2.7 s
Other	843 ms
Style & Layout	444 ms
Script Parsing & Compilation	335 ms
Garbage Collection	95 ms
Parse HTML & CSS	51 ms
Rendering	45 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

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
/deliveries/25443a62837dcd5c0dcd30f5e0f834dbbf5b239a.m3u8...	624.4 KiB
www.outbrain.com/images/pages/home/performance__2.png	409.2 KiB
/deliveries/7b084aeba6e2d2ca22e479e508bec5a54f083a19.m3u8...	286.2 KiB
/deliveries/7b084aeba6e2d2ca22e479e508bec5a54f083a19.m3u8...	283.2 KiB
www.outbrain.com/images/pages/home/hero-main-image.png	250.1 KiB
/deliveries/7b084aeba6e2d2ca22e479e508bec5a54f083a19.m3u8...	227.4 KiB
/deliveries/7b084aeba6e2d2ca22e479e508bec5a54f083a19.m3u8...	218.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-MNMBTC	182.2 KiB
fast.wistia.com/assets/external/E-v1.js	162.1 KiB
/deliveries/7b084aeba6e2d2ca22e479e508bec5a54f083a19.m3u8...	159.7 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
div.bottom-cta__inner > div.bottom-cta__inner-left > picture > img `div.bottom-cta__inner > div.bottom-cta__inner-left > picture > img`	www.outbrain.com/images/pages/home/bottom-cta-image-mobile.webp
div.performance-cards > div.performance-cards__item > picture > img `div.performance-cards > div.performance-cards__item > picture > img`	www.outbrain.com/images/pages/home/performance__1.png
div.performance-cards > div.performance-cards__item > picture > img `div.performance-cards > div.performance-cards__item > picture > img`	www.outbrain.com/images/pages/home/performance__2.png
div.performance-cards > div.performance-cards__item > picture > img `div.performance-cards > div.performance-cards__item > picture > img`	www.outbrain.com/images/pages/home/performance__3.png
div.performance-cards > div.performance-cards__item > picture > img `div.performance-cards > div.performance-cards__item > picture > img`	www.outbrain.com/images/pages/home/performance__4.png
Outbrain Direct logo `div.header-inner > div.logo > a > img`	www.outbrain.com/images/logo-ob-direct.png
Outbrain Direct logo `div.footer-top > div.footer-top-inner > div.footer-left > img`	www.outbrain.com/images/logo-ob-direct.png

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

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 316 user timings

●Avoid long main-thread tasks 12 long tasks found

●Network Requests

●Network Round Trip Times 10 ms

●Server Backend Latencies 120 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 210 ms

○INP breakdown

○Avoid non-composited animations

○Avoid large layout shifts

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

Each ARIA `role` supports a specific subset of `aria-*` attributes. Mismatching these invalidates the `aria-*` attributes. Learn how to match ARIA attributes to their roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Advertisers Advertisers Ads Specs Buy Your Way Advertiser Guidelines Advertisin… `div.footer-top-inner > div.footer-menu-links > div.expandable > div`
Insights Advertising Glossary Vertical Insights Vertical Hub `div.footer-top-inner > div.footer-menu-links > div.expandable > div`
Performance Affiliate Marketing Affiliate Hub High-Conversion Content Repurpose… `div.footer-top-inner > div.footer-menu-links > div.expandable > div`
Company About Us Leadership Join Us Trust & Transparency News Contact Us Partne… `div.footer-top-inner > div.footer-menu-links > div.expandable > div`
Resources Blog Resources Hub Marketing Podcast Case Studies Help Center Partners `div.footer-top-inner > div.footer-menu-links > div.expandable > div`

Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Affiliate Marketing `div > ul.menu-nav > li > a`
High-Conversion Content `div > ul.menu-nav > li > a`
Repurpose Social Campaigns `div > ul.menu-nav > li > a`

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.

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
Data Never Lies. Neither Do Our Partners. `section.partners > div.partners__inner > div.partners__inner-top > h5`
Customer-Centricity `div.performance-cards > div.performance-cards__item > div.performance-cards__content > h6`
It's the same commitment, amplified. `div.container > div.featured-section__inner > blockquote.featured-section__blockquote > h5`
Create your campaign with an Outbrain expert. `section.bottom-cta > div.bottom-cta__inner > div.bottom-cta__inner-right > h6`

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
new Teads `div.content > div.text > p.mobile-only > a`
Outbrain’s Privacy Policy. `div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a.ot-cookie-policy-link`

○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-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.

●`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

●`<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.

●Document has a main landmark.

●Deprecated ARIA roles were not used

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

●Uses ARIA roles only on compatible elements

○`[accesskey]` values are unique

○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

○`<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

○Select elements have associated label elements.

○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.

○`[lang]` attributes have a valid value

○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.

○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

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
Close Icon `div#topBanner > div.close > button > img#closeBannerButton`	www.outbrain.com/assets/new-banner-close.png	24 x 24	24 x 24	36 x 36

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
www.outbrain.com/script.js?version=4d2133b27bf2 line 1, col 194620	`TypeError: Cannot read properties of null (reading 'addEventListener') at 7941 (https://www.outbrain.com/script.js?version=4d2133b27bf2:2:194621) at n (https://www.outbrain.com/script.js?version=4d2133b27bf2:2:338664) at https://www.outbrain.com/script.js?version=4d2133b27bf2:2:339025 at https://www.outbrain.com/script.js?version=4d2133b27bf2:2:339034`

●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

●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 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

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
www.outbrain.com/blog/outbrain-direct-response-odr-defining-performance/	Read 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`