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 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:67.456 source:map[column:225583 line:43 type:source-location url:https://www.bigcommerce.com/_next/static/chunks/pages/_app-8baf31dee9a7b458.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:13.515 source:map[column:216528 line:11 type:source-location url:https://www.bigcommerce.com/_next/static/chunks/pages/_app-8baf31dee9a7b458.js urlProvider:network]] map[reflowTime:5.734 source:map[column:210406 line:11 type:source-location url:https://www.bigcommerce.com/_next/static/chunks/pages/_app-8baf31dee9a7b458.js urlProvider:network]] map[reflowTime:67.456 source:map[column:43415 line:9 type:source-location url:https://www.bigcommerce.com/_next/static/chunks/pages/_app-8baf31dee9a7b458.js urlProvider:network]]]

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
/asset/d51772e2-bf34-40ad-8289-ec1f0554938f/mp4/BC-Hero-A...	3600.0 s	925.2 KiB
/m/29eb9d85770910ee/original/logo-mailchimp-color-circle-...	3600.0 s	3.2 KiB
/m/6fa150f45966756d/original/icon-navigation-why-bigcomme...	3600.0 s	2.8 KiB
dam.bigcommerce.com/m/179d5d0a14041025/original/BC_Wordmark_Black.svg	3600.0 s	2.2 KiB
/m/2c159bce7b56ccab/original/icon-navigation-why-bigcomme...	3600.0 s	1.6 KiB
dam.bigcommerce.com/m/a394593bd875385/original/fdx-logo.svg	3600.0 s	1.6 KiB
dam.bigcommerce.com/m/e431e7aac86fe71/original/stripe-logo.svg	3600.0 s	1.6 KiB
dam.bigcommerce.com/m/1cb0a54033d0f25a/original/paypal-logo.svg	3600.0 s	1.5 KiB
/asset/6689ded9-77e9-4a92-812d-444ff1d0071b/original/Make...	3600.0 s	1.5 KiB
/m/39412475f4c8b913/original/icon-navigation-why-bigcomme...	3600.0 s	1.5 KiB
dam.bigcommerce.com/m/bed12b561ac4a68/original/algolia-logo.svg	3600.0 s	1.4 KiB
/m/5d9c672695d3c0e5/original/icon-navigation-why-bigcomme...	3600.0 s	1.4 KiB
dam.bigcommerce.com/m/780d051412681442/original/BigCommerce-B-Mark-Black.svg	3600.0 s	1.3 KiB
/m/767e034cf9ad8fa6/original/icon-navigation-why-bigcomme...	3600.0 s	1.2 KiB
dam.bigcommerce.com/m/ae52a8f985d40d1/original/klaviyo-logo.svg	3600.0 s	1.1 KiB
dam.bigcommerce.com/m/6fd933c06d6e6666/original/icon-checkmark-blue.svg	3600.0 s	850 B

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.css-1koyzif > div > div > img `div.css-1koyzif > div > div > img`	/_next/image/?url=https%3A%2F%2Fdam.bigcommerce.com%2Fm%2...	56.1 KiB	38.5 KiB
Diagram showing Feedonomics syncing product data to Google and Meta to drive e-… `div.css-6x1mo7 > div.grid-item > div.css-1811n55 > img`	/_next/image/?url=https%3A%2F%2Fdam.bigcommerce.com%2Fm%2...	17.2 KiB	14.3 KiB
BigCommerce B2B Edition portal tracking wholesale shipments and payment status … `div.css-6x1mo7 > div.grid-item > div.css-1811n55 > img`	/_next/image/?url=https%3A%2F%2Fdam.bigcommerce.com%2Fm%2...	14.8 KiB	12.3 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

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.

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 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 396.6 KiB

URL	Transfer Size	Est Savings
www.bigcommerce.com/_next/static/chunks/pages/_app-8baf31dee9a7b458.js	410.8 KiB	195.9 KiB
www.bigcommerce.com/_next/static/chunks/2116-50e1b1f0cf02c8d4.js	132.8 KiB	118.3 KiB
www.bigcommerce.com/_next/static/chunks/01587d02-e76a22e6c152deb6.js	48.0 KiB	44.8 KiB
www.bigcommerce.com/_next/static/chunks/7554.06f98d95ca62a820.js	44.9 KiB	37.7 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.bigcommerce.com/_next/static/chunks/framework-b7b8137fa3a9d31a.js	3.0 s	2.7 s	5.0 ms
www.bigcommerce.com/_next/static/chunks/pages/_app-8baf31dee9a7b458.js	1.2 s	705 ms	60 ms
Unattributable	491 ms	21 ms	0.0 ms
www.bigcommerce.com/	394 ms	8.2 ms	0.5 ms
www.bigcommerce.com/_next/static/chunks/7554.06f98d95ca62a820.js	182 ms	178 ms	4.1 ms
www.bigcommerce.com/_next/static/chunks/main-742be3fa220ac20b.js	170 ms	148 ms	5.1 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	3.9 s
Other	682 ms
Style & Layout	336 ms
Garbage Collection	244 ms
Rendering	192 ms
Script Parsing & Compilation	109 ms
Parse HTML & CSS	64 ms

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 11.5 KiB

URL	Transfer Size	Est Savings
.css-ptumwb { display: flex; } …	51.1 KiB	8.1 KiB
.css-248241{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex; … } …	41.6 KiB	3.4 KiB

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: 0.0 ms 99.7 KiB

URL	Transfer Size	Est Savings
.css-ptumwb { display: flex; } …	51.1 KiB	48.5 KiB
.css-248241{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex; … } …	41.1 KiB	31.4 KiB
www.bigcommerce.com/_next/static/css/ecd5ebc5e24ba396.css	22.8 KiB	19.8 KiB

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
/asset/d51772e2-bf34-40ad-8289-ec1f0554938f/mp4/BC-Hero-A...	925.2 KiB
www.bigcommerce.com/_next/static/chunks/pages/_app-8baf31dee9a7b458.js	413.8 KiB
www.bigcommerce.com/	85.3 KiB
www.bigcommerce.com/mm/fonts/Gotham-MediumItalic.otf	58.1 KiB
/_next/image/?url=https%3A%2F%2Fdam.bigcommerce.com%2Fm%2...	57.2 KiB
www.bigcommerce.com/mm/fonts/Gotham-BoldItalic.otf	54.4 KiB
www.bigcommerce.com/_next/data/d2b1d0d/en-US.json	48.5 KiB
/_next/data/d2b1d0d/en-US/product/catalyst.json?path=prod...	47.1 KiB
www.bigcommerce.com/_next/static/chunks/framework-b7b8137fa3a9d31a.js	45.9 KiB
www.bigcommerce.com/_next/data/d2b1d0d/en-US/cookies.json	45.4 KiB

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Network dependency tree

●Render blocking requests

●Optimize viewport for mobile

●Minify JavaScript

●User Timing marks and measures 8 user timings

●Avoid long main-thread tasks 14 long tasks found

●Avoid non-composited animations 27 animated elements found

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

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 0 ms

●Server Backend Latencies 50 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 450 ms

●Avoid large layout shifts 3 layout shifts found

○INP breakdown

○LCP request discovery

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
211% ROI in less than 8 months. `div.custom-text > div > p.css-egobtx > span.css-d492dq`
391% three-year ROI with B2B Edition. `div.custom-text > div > p.css-egobtx > span.css-d492dq`
Most-installed BigCommerce app of 2025. `div.custom-text > div > p.css-egobtx > span.css-d492dq`
12m+ products synced. `div.custom-text > div > p.css-egobtx > span.css-d492dq`

These are opportunities to improve the legibility of your content.

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
Register for Commerce Live 2026 `div.grid-item > div.custom-text > div > h4.css-1ptj27q`

These are opportunities to improve keyboard navigation in your application.

Tables and lists

Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
WHY BIGCOMMERCE? Engage Hosted low/no code, headless, or both. Attract Impr… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
SOLUTIONS Small Business Grow your brand with the top-rated ecommerce platfor… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
FEATURED B2B Edition Advanced B2B features for enterprise plans. Catalyst N… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
LAUNCH SERVICES Overview Chart your path to success with specialized services… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
SUCCESS SERVICES Overview Technical and strategic guidance to help  you grow.… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
TRAINING BigCommerce University Overview Set your team up for success, regard… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
LEARNING RESOURCES Overview Articles Guides Webinars Podcasts University … `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
SUCCESS STORIES Case Studies Read our success stories. Customer Showcase Se… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
RECOGNITION Analyst Reports Learn what experts are saying. Awards See where… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`
PARTNERS Overview Discover your partner in growth. Become a Partner Join ou… `div.w-full > div.w-full > div.z-10 > ul.shrink-0`

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Events `div.z-10 > ul.shrink-0 > li.group > a.group/link`
Blog `div.z-10 > ul.shrink-0 > li.group > a.group/link`

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 `html`

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-*]` 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

●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

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

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

●Deprecated ARIA roles were not used

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

●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

○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.

○Uses ARIA roles only on compatible elements

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

○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.

100

Best Practices

General

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.

●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

●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

○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.

Crawling and Indexing

Search engines are unable to include your pages in search results if they don't have permission to crawl them. Learn more about crawler directives.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Blocking Directive Source
`head > meta`

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

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.bigcommerce.com/product/catalyst/	LEARN MORE
www.bigcommerce.com/blog/category/professional-services/	LEARN MORE
www.bigcommerce.com/essentials/	LEARN MORE
feedonomics.com/	LEARN MORE
www.makeswift.com/	LEARN MORE

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●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`