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.

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
/media/videos/card_covers/card_Use_AI_Responsibly_in_Anal...	14400.0 s	163.7 KiB
media.nngroup.com/static/js/output.8221eeaec7a2.js	14400.0 s	159.3 KiB
/media/videos/card_covers/card_Field_Guide_to_Explaining_...	14400.0 s	147.4 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
media.nngroup.com/media/images/SP_Thumbnails_7_TA3lF90.width-330.png	14400.0 s	92.6 KiB
media.nngroup.com/media/images/SP_Thumbnails_12_ZXbCnxY.width-330.png	14400.0 s	84.9 KiB
media.nngroup.com/static/css/output.8a2ac8cc91c7.css	14400.0 s	77.3 KiB
media.nngroup.com/static/fonts/Inter-VariableFont_opszwght.woff2	14400.0 s	69.3 KiB
/signals/config/1205361211741522?v=2.9.303&r=stable&domai...	1200.0 s	44.4 KiB
media.nngroup.com/static/img/logos/amazon-logo-home.svg	14400.0 s	33.9 KiB
/media/articles/card_covers/6_Competencies-card.png.324x3...	14400.0 s	29.4 KiB
media.nngroup.com/static/fonts/SourceSansVariable.subset.min.v4.woff2	14400.0 s	23.6 KiB
media.nngroup.com/static/fonts/SourceSansItalicVariable.subset.min.v4.woff2	14400.0 s	21.0 KiB
media.nngroup.com/static/js/output.3e6a450e0b15.js	14400.0 s	19.5 KiB
tools.luckyorange.com/core/lo.js?site-id=e5c040f4	3600.0 s	14.3 KiB
/media/articles/card_covers/Less_Chat-cover.png.324x324_q...	14400.0 s	15.5 KiB
media.nngroup.com/static/img/banners/ux-banner.svg	14400.0 s	5.5 KiB
media.nngroup.com/static/bundles/consent.js	14400.0 s	4.6 KiB
media.nngroup.com/media/courses/icons/CourseAI_for_Design_Workflows_0mcAr2s.svg	14400.0 s	1.6 KiB
media.nngroup.com/static/img/icons/icon-play.svg	14400.0 s	1.3 KiB
cdn-cookieyes.com/assets/images/poweredbtcky.svg	36000.0 s	1.6 KiB
media.nngroup.com/media/courses/icons/CourseUsability_Testing.svg	14400.0 s	987 B
media.nngroup.com/static/css/output.e9c610b5facf.css	14400.0 s	701 B
cdn-cookieyes.com/assets/images/close.svg	36000.0 s	797 B
/tr/?id=1205361211741522&ev=PageView&dl=https%3A%2F%2Fwww...	0.0 ms	19 B

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.

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.articles-videos > div.content-card > div.content-card__image > img `div.articles-videos > div.content-card > div.content-card__image > img`	/media/videos/card_covers/card_Use_AI_Responsibly_in_Anal...	163.0 KiB	155.3 KiB
div.articles-videos > div.content-card > div.content-card__image > img `div.articles-videos > div.content-card > div.content-card__image > img`	/media/videos/card_covers/card_Field_Guide_to_Explaining_...	146.8 KiB	139.0 KiB
SP_Thumbnails_7 `section.home-courses > ul.course-cards > li.course-card > img`	media.nngroup.com/media/images/SP_Thumbnails_7_TA3lF90.width-330.png	92.0 KiB	86.7 KiB
SP_Thumbnails_12 `section.home-courses > ul.course-cards > li.course-card > img`	media.nngroup.com/media/images/SP_Thumbnails_12_ZXbCnxY.width-330.png	84.3 KiB	79.0 KiB
section.homepage-rebranding > div.articles-videos > div.content-card > img `section.homepage-rebranding > div.articles-videos > div.content-card > img`	/media/articles/card_covers/6_Competencies-card.png.324x3...	28.9 KiB	16.5 KiB

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
cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/script.js	8.9 KiB	258 ms
media.nngroup.com/static/css/output.8a2ac8cc91c7.css	77.3 KiB	122 ms
media.nngroup.com/static/bundles/consent.js	4.6 KiB
media.nngroup.com/static/css/output.e9c610b5facf.css	701 B	205 ms

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
media.nngroup.com/static/fonts/Inter-VariableFont_opszwght.woff2	5.0 ms

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: 255 ms

URL	Time Spent
nngroup.com/	255 ms
www.nngroup.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: 40 ms 71.4 KiB

URL	Transfer Size	Est Savings
media.nngroup.com/static/css/output.8a2ac8cc91c7.css	76.9 KiB	71.4 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: 160 ms 322.0 KiB

URL	Transfer Size	Est Savings
media.nngroup.com/static/js/output.8221eeaec7a2.js	158.8 KiB	92.1 KiB
www.googletagmanager.com/gtag/js?id=G-630S9ESVKM&cx=c&gtm=4e64k0h2	172.5 KiB	69.4 KiB
www.googletagmanager.com/gtag/js?id=AW-16569705699&cx=c&gtm=4e64k0h2	144.3 KiB	65.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-THJDDHK	182.4 KiB	61.1 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	34.2 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
AI for Design Workflows `section.home-courses > ul.course-cards > li.course-card > img`	media.nngroup.com/media/courses/icons/CourseAI_for_Design_Workflows_0mcAr2s.svg
Usability Testing `section.home-courses > ul.course-cards > li.course-card > img`	media.nngroup.com/media/courses/icons/CourseUsability_Testing.svg
Amazon Logo `div.content > ul > li > img.amazon`	media.nngroup.com/static/img/logos/amazon-logo-home.svg

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

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 1,698 KiB

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.3 s

●Minimizes main-thread work 1.2 s

●Avoid long main-thread tasks 4 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 50 ms

●Server Backend Latencies 370 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 20 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○LCP request discovery

○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.

Names and labels

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.newsletter > form.form-field > div.subscribe-wrap > input.newsletter-email `div.newsletter > form.form-field > div.subscribe-wrap > input.newsletter-email`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

○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.

●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.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●ARIA IDs are unique

●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

○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.

○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

○`<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

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	connect.facebook.net/en_US/fbevents.js line 279, col 769

Issues logged to the `Issues` panel in Chrome Devtools indicate unresolved problems. They can come from network request failures, insufficient security controls, and other browser concerns. Open up the Issues panel in Chrome DevTools for more details on each issue.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Issue type
Content security policy

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.

URL
media.nngroup.com/static/js/output.8221eeaec7a2.js

●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

●Ensure CSP is effective against XSS attacks

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Ensure proper origin isolation with COOP

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`