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
www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB	21600.0 s	169.5 KiB
www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB	21600.0 s	169.5 KiB
/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=56a...	21600.0 s	147.0 KiB
/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac...	1556971.0 s	158.3 KiB
/analytics-dotcom/analyticsInit-f7791796aa580255fd2861090...	954750.0 s	85.9 KiB
/~assets/bby/_com/analytics-dotcom/initChildPipeline-ffee...	468822.0 s	36.8 KiB
/~assets/bby/_com/sc-pattern-library/dist/e4ad7a6cc30f915...	315129.0 s	20.7 KiB
/~assets/bby/_com/sc-pattern-library/dist/9b64d8057a58697...	945093.0 s	21.9 KiB
/~assets/bby/_com/sc-pattern-library/dist/5562484cf98053a...	1883990.0 s	21.8 KiB
www.bestbuy.com/~assets/bby/_intl/landing_page/js/zepto.min.js	707158.0 s	9.7 KiB
www.bestbuy.com/~assets/bby/_com/legacy-66138ea0147dd17ecdc9dc0ac1b86344.min.js	1951936.0 s	6.7 KiB
/~assets/bby/_com/header-footer/images/bby_logo-a7e905947...	2383344.0 s	6.7 KiB
www.bestbuy.com/~assets/bby/_intl/landing_page/css/app.css	882527.0 s	1.9 KiB
www.bestbuy.com/~assets/bby/_intl/landing_page/js/app.min.js	1225614.0 s	1.0 KiB
www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/canada.svg	2262294.0 s	1.0 KiB
www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/usa.svg	1330789.0 s	690 B
www.bestbuy.com/~assets/bby/_intl/landing_page/images/icons/arrow.svg	1735932.0 s	679 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.

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:10508.341 label:Time to first byte subpart:timeToFirstByte] map[duration:77.579 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-H1

nodeLabel: Choose a country.

path: 1,HTML,1,BODY,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,2,H1

selector: div.container > div.content > div > h1

snippet: <h1>

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

value: No additional origins are good candidates for preconnecting

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
Best Buy Logo `div.container > div.content > div > img.logo`	/~assets/bby/_com/header-footer/images/bby_logo-a7e905947...	6.4 KiB	5.8 KiB

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
www.bestbuy.com/~assets/bby/_intl/landing_page/css/app.css	1.9 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: 319 ms

URL	Time Spent
bestbuy.com/	319 ms
www.bestbuy.com/	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: 10.2 s

URL	Time Spent
www.bestbuy.com/	10.3 s

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

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

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: 0.0 ms 316.3 KiB

URL	Transfer Size	Est Savings
/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac...	158.0 KiB	116.7 KiB
/analytics-dotcom/analyticsInit-f7791796aa580255fd2861090...	85.7 KiB	46.9 KiB
www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB	168.4 KiB	35.8 KiB
www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB	168.4 KiB	35.8 KiB
/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=56a...	146.5 KiB	30.6 KiB
/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=56a...	146.5 KiB	30.2 KiB
/~assets/bby/_com/analytics-dotcom/initChildPipeline-ffee...	36.5 KiB	20.4 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
United States `div > div.country-selection > a.us-link > img`	www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/usa.svg
Canada `div > div.country-selection > a.canada-link > img`	www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/canada.svg
Best Buy Logo `div.container > div.content > div > img.logo`	/~assets/bby/_com/header-footer/images/bby_logo-a7e905947...
div > p.info > a.more-details > img `div > p.info > a.more-details > img`	www.bestbuy.com/~assets/bby/_intl/landing_page/images/icons/arrow.svg

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

●Time to Interactive 2.1 s

●Layout shift culprits

●Optimize DOM size

●Font display

●Forced reflow

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Avoids enormous network payloads Total size was 889 KiB

●JavaScript execution time 1.2 s

●Minimizes main-thread work 1.5 s

●Avoid long main-thread tasks 6 long tasks found

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 210 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid large layout shifts 4 layout shifts found

○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.

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
Canada `div > div.country-selection > a.canada-link > h4`

These are opportunities to improve keyboard navigation in your application.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div > p.info > a.more-details > img `div > p.info > a.more-details > img`

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.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.no-js `html.no-js`

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

●Buttons have an accessible name

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●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

●Touch targets have sufficient size and spacing.

●`[lang]` attributes have a valid value

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

○`[accesskey]` values are unique

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

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

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

○Deprecated ARIA roles were not used

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

○`[aria-hidden="true"]` elements do not contain focusable descendents

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements use only permitted ARIA attributes

○`[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

○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

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

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

○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

○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.

○Skip links are focusable.

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

○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.

○`<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

○Identical links have the same purpose.

○Elements with visible text labels have matching accessible names.

○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)
Best Buy Logo `div.container > div.content > div.hidden > img.logo`	/~assets/bby/_com/header-footer/images/bby_logo-a7e905947...	80 x 139 (0.58)	236 x 139 (1.70)
Best Buy Logo `div.container > div.content > div.hidden > img.logo`	/~assets/bby/_com/header-footer/images/bby_logo-a7e905947...	80 x 139 (0.58)	236 x 139 (1.70)

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

Source	Description
/analytics-dotcom/analyticsInit-f7791796aa580255fd2861090... line 3, col 288304	TypeError: Cannot set properties of undefined (setting 'oo_onSingleClick') at https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:292323 at https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:294504 at Array.forEach (<anonymous>) at t.value (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:294452) at t.<anonymous> (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:288225) at l (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:216405) at Generator._invoke (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:216158) at Generator.next (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:216764) at o (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:22129) at c (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:22328)

/analytics-dotcom/analyticsInit-f7791796aa580255fd2861090... line 3, col 288304

TypeError: Cannot set properties of undefined (setting 'oo_onSingleClick')
    at https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:292323
    at https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:294504
    at Array.forEach (<anonymous>)
    at t.value (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:294452)
    at t.<anonymous> (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:288225)
    at l (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:216405)
    at Generator._invoke (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:216158)
    at Generator.next (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:216764)
    at o (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:22129)
    at c (https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js:4:22328)

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	Map URL
/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac...	www.bestbuy.com/~assets/bby/_com/shim.min.js.map
www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB
www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB
www.bestbuy.com/~assets/bby/_com/legacy-66138ea0147dd17ecdc9dc0ac1b86344.min.js	www.bestbuy.com/~assets/bby/_com/backbone-min.map

●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 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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

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.

Crawling and Indexing

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

To appear in search results, crawlers need access to your app.

Content Best Practices

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div > p.info > a.more-details > img `div > p.info > a.more-details > img`

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 have descriptive text

●Links are crawlable

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`