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.

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.392648] map[node:map[boundingRect:map[bottom:947 height:728 left:0 right:1350 top:219 width:1350] lhId:page-1-DIV nodeLabel:The Clojure Programming Language Clojure is a dynamic, general-purpose program… path:3,HTML,1,BODY,3,DIV selector:body > div.w-section snippet:<div class="w-section clj-home-intro-section"> type:node] score:0.392529 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:82 height:82 left:497 right:1210 top:0 width:713] lhId:page-2-NAV nodeLabel:OVERVIEWREFERENCE‍APIRELEASESGUIDESCOMMUNITYDEVNEWS path:3,HTML,1,BODY,0,DIV,0,DIV,1,NAV selector:body > div.w-nav > div.w-container > nav.w-nav-menu snippet:<nav role="navigation" class="w-nav-menu clj-nav-menu"> type:node] score:0.000119 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://www.clojure.org/fonts/icofont.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/ptserif/v19/EJRTQgYoZZY2vCFuvAFT_r21cgT9rcs.woff2]]] type:subitems]]]

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

items: [map[reflowTime:11.471 source:map[column:1729 line:3 type:source-location url:https://www.clojure.org/js/modernizr.js urlProvider:network]] map[reflowTime:45.562 source:map[type:text value:[unattributed]]]]

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=Open+Sans:ital,wght@0,300;0,400;0,600;1,300;...	2.8 KiB	315 ms
www.clojure.org/css/default-en.css	1.5 KiB
www.clojure.org/css/asciidoctor-mod.css	2.6 KiB
www.clojure.org/css/search-result.css	735 B
www.clojure.org/css/default.css	984 B
www.clojure.org/js/modernizr.js	2.7 KiB
www.clojure.org/css/clojureorg.webflow.css	4.3 KiB
www.clojure.org/css/webflow.css	7.2 KiB
www.clojure.org/css/normalize.css	1.1 KiB

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.matomo.cloud/cognitect.matomo.cloud/matomo.js	691200.0 s	56.8 KiB
www.clojure.org/js/webflow.js	604800.0 s	35.3 KiB
www.clojure.org/js/highlight.pack.js	604800.0 s	11.8 KiB
www.clojure.org/css/webflow.css	604800.0 s	7.2 KiB
www.clojure.org/css/clojureorg.webflow.css	604800.0 s	4.3 KiB
www.clojure.org/js/modernizr.js	604800.0 s	2.7 KiB
/plugins/HeatmapSessionRecording/configs.php?idsite=9&tra...	0.0 ms	269 B
www.clojure.org/css/asciidoctor-mod.css	604800.0 s	2.6 KiB
www.clojure.org/css/default-en.css	604800.0 s	1.5 KiB
www.clojure.org/css/normalize.css	604800.0 s	1.1 KiB
www.clojure.org/css/default.css	604800.0 s	984 B
www.clojure.org/css/search-result.css	604800.0 s	735 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
Clojure TV logo `div.w-col > div.clj-learn-more > a > img`	www.clojure.org/images/clojuretv.png	67.8 KiB	62.0 KiB
div.w-container > div.w-row > div.w-col > img.clj-home-support-logo `div.w-container > div.w-row > div.w-col > img.clj-home-support-logo`	www.clojure.org/images/nulogo.png	12.6 KiB	6.6 KiB

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

Diagnostics

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 12.5 KiB

URL	Transfer Size	Est Savings
www.clojure.org/js/webflow.js	35.0 KiB	12.5 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: 0.0 ms 52.9 KiB

URL	Transfer Size	Est Savings
cdn.matomo.cloud/cognitect.matomo.cloud/matomo.js	56.4 KiB	32.9 KiB
www.clojure.org/js/webflow.js	35.0 KiB	20.1 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
Clojure TV logo `div.w-col > div.clj-learn-more > a > img`	www.clojure.org/images/clojuretv.png
Clojure logo `div.w-nav > div.w-container > a.w-nav-brand > img.clj-logo`	www.clojure.org/images/clojure-logo-120b.png

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

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
The Clojure Programming Language Clojure is a dynamic, general-purpose program… `body > div.w-section`	0.393
OVERVIEWREFERENCE‍APIRELEASESGUIDESCOMMUNITYDEVNEWS `body > div.w-nav > div.w-container > nav.w-nav-menu`	0.000

●Document request latency

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 0.9 s

●Max Potential First Input Delay 20 ms

●Minify CSS

●Reduce unused CSS

●Avoids enormous network payloads Total size was 318 KiB

●JavaScript execution time 0.1 s

●Minimizes main-thread work 0.3 s

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 70 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 30 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

○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.

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
Companies Succeeding with Clojure `div.w-section > div.w-container > div > h3.clj-home-companies-heading`
Anthony Marcar, Senior Architect Walmart Labs `div.w-row > div.w-col > div.clj-home-company > div.clj-home-company-attribution`
Chris Price, Software Engineer Puppet Labs `div.w-row > div.w-col > div.clj-home-company > div.clj-home-company-attribution`
Dave Elliman, Head of Technology ThoughtWorks `div.w-row > div.w-col > div.clj-home-company > div.clj-home-company-attribution`
Read more about Clojure success stories, how the community uses Clojure, and fi… `div.w-section > div.w-container > div.clj-home-company-text > p`
success stories `div.w-container > div.clj-home-company-text > p > a.clj-home-company-link`
community `div.w-container > div.clj-home-company-text > p > a.clj-home-company-link`
companies using Clojure `div.w-container > div.clj-home-company-text > p > a.clj-home-company-link`
2026-03-30 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
Clojure Zero to REPL Video `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`
2026-03-26 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
Clojure Documentary Trailer (Mar 26, 2026) `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`
2026-03-18 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
Clojure Deref (Mar 18, 2026) `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`
2026-03-11 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
core.async and Virtual Threads `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`
2026-03-10 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
Clojure Deref (Mar 10, 2026) `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`
2026-04-09 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
Los Angeles Clojure Meetup: Hyper `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`
2026-04-16 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
Clojure Documentary Premiere `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`
2026-04-25 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
Clojure Community Check-In `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`
2026-05-09 `div.clj-home-updates-container > ul.w-list-unstyled > li > span.clj-home-updates-date`
Dutch Clojure Days free conference `div.clj-home-updates-container > ul.w-list-unstyled > li > a.clj-home-updates-link`

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
COMMUNITY `div.w-container > div.w-row > div.w-col > h6.clj-footer-heading`

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.w-container > div.w-row > div.w-col > img.clj-home-support-logo `div.w-container > div.w-row > div.w-col > img.clj-home-support-logo`

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.w-mod-js `html.w-mod-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>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

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

●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

●Touch targets have sufficient size and spacing.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[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

○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

○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

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

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

○Buttons have an accessible name

○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.

○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.

○`[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.

○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

●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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○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.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.w-container > div.w-row > div.w-col > img.clj-home-support-logo `div.w-container > div.w-row > div.w-col > img.clj-home-support-logo`

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

●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`