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Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

79

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:0.24750000000000003] map[node:map[boundingRect:map[bottom:1284 height:658 left:99 right:1251 top:626 width:1152] lhId:page-1-IMG nodeLabel:Hero Banner path:2,HTML,1,BODY,23,DIV,0,DIV,0,DIV,0,DIV,0,MAIN,0,SECTION,0,DIV,2,DIV,0,PICTURE,1,IMG selector:div.hero-banner > div.hero-banner__values > picture > img.hero-banner__image snippet:<img src="https://static.mendeley.com/md-stitch/releases/live/hero-banner.avif" alt="Hero Banner" class="hero-banner__image" loading="lazy" decoding="async"> type:node] score:0.247266] map[node:map[boundingRect:map[bottom:344 height:40 left:443 right:644 top:304 width:201] lhId:page-3-A nodeLabel:Download for MacOS path:2,HTML,1,BODY,23,DIV,0,DIV,0,DIV,0,DIV,0,MAIN,0,SECTION,0,DIV,1,DIV,0,A selector:section#hero-banner > div.hero-banner > div.hero-banner__actions > a.hero-banner__download-link snippet:<a class="hero-banner__download-link" download="" href="https://static.mendeley.com/bin/desktop/mendeley-reference-manager-2.144.0…"> type:node] score:0.000234 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://static.mendeley.com/md-stitch/releases/live/NexusSansWebPro.c20f87ed.woff]]] type:subitems]]]

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.

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.

URLEst Savings
static.mendeley.com/md-stitch/releases/live/NexusSansWebPro.c20f87ed.woff35 ms

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:36.893 source:map[type:text value:[unattributed]]]]

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-0-MAIN
nodeLabel: The free all-in-one reference manager Mendeley helps you stay organized, do mor…
path: 2,HTML,1,BODY,23,DIV,0,DIV,0,DIV,0,DIV,0,MAIN
selector: div.graphene-2-light > div._component_1p1sc_112 > div._component_scmkk_112 > main._component_v5frg_112
snippet: <main data-component="MainArea" data-scrolling-at="PageLayoutLevel" class="_component_v5frg_112">

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

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.

URLTransfer SizeDuration
static.mendeley.com/md-stitch/releases/live/dist-homepage.a5a6aeee.css63.0 KiB
static.mendeley.com/md-stitch/releases/live/common.body-header.b86865fe.css3.0 KiB
static.mendeley.com/md-stitch/releases/live/404.body.c71cd879.css981 B240 ms

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.

RequestCache TTLTransfer Size
static.mendeley.com/md-stitch/releases/live/homepage-promotional-banner.jpg0.0 ms8.0 MiB
static.mendeley.com/md-stitch/releases/live/blog-img-1.jpg0.0 ms2.1 MiB
static.mendeley.com/md-stitch/releases/live/blog-img-2.jpg0.0 ms1.0 MiB
static.mendeley.com/md-stitch/releases/live/blog-img-3.jpg0.0 ms1009.9 KiB
static.mendeley.com/md-stitch/releases/live/hero-banner.avif0.0 ms392.1 KiB
static.mendeley.com/md-stitch/releases/live/mendeley-mrm.avif0.0 ms176.2 KiB
static.mendeley.com/md-stitch/releases/live/ask-my-library.avif0.0 ms105.0 KiB
assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.js3600.0 s106.6 KiB
cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js86400.0 s119.2 KiB
static.mendeley.com/md-stitch/releases/live/background.svg0.0 ms13.8 KiB
cdn.cookielaw.org/logos/static/ot_company_logo.png86400.0 s19.2 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js86400.0 s9.1 KiB
/beacon.min.js/vcd15cbe7772f49c399c6a5babf22c124171768917...86400.0 s6.9 KiB
static.mendeley.com/lib-js-analytics/live/common-analytics.js60.0 s1.6 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg86400.0 s2.5 KiB
/4a848ae9611a/aa520520f55b/a63fb5b7b322/RCeb12d4e491b043b...3600.0 s837 B
/4a848ae9611a/aa520520f55b/a63fb5b7b322/RCeda49fd1eb0d4b9...3600.0 s655 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.

URLResource SizeEst Savings
main._component_v5frg_112 > section#promotional-banner > div.promotional-banner > img.promotional-banner__image main._component_v5frg_112 > section#promotional-banner > div.promotional-banner > img.promotional-banner__image
static.mendeley.com/md-stitch/releases/live/homepage-promotional-banner.jpg8.0 MiB7.8 MiB
Mendeley AI features for research div.blog-cards__items > div.blog-cards__item > div.blog-cards__image > img.blog-cards__img
static.mendeley.com/md-stitch/releases/live/blog-img-1.jpg2.1 MiB2.0 MiB
Mendeley AI tools for research efficiency div.blog-cards__items > div.blog-cards__item > div.blog-cards__image > img.blog-cards__img
static.mendeley.com/md-stitch/releases/live/blog-img-2.jpg1.0 MiB1.0 MiB
Study tips for exam preparation div.blog-cards__items > div.blog-cards__item > div.blog-cards__image > img.blog-cards__img
static.mendeley.com/md-stitch/releases/live/blog-img-3.jpg1008.5 KiB999.8 KiB
Hero Banner div.hero-banner > div.hero-banner__values > picture > img.hero-banner__image
static.mendeley.com/md-stitch/releases/live/hero-banner.avif391.4 KiB360.4 KiB
Add and organize pdf div.text-image > div.text-image__image > picture > img.text-image__img
static.mendeley.com/md-stitch/releases/live/mendeley-mrm.avif175.7 KiB146.4 KiB
Example of how to use mendeley ai div.text-image > div.text-image__image > picture > img.text-image__img
static.mendeley.com/md-stitch/releases/live/ask-my-library.avif104.5 KiB87.5 KiB

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

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 80.2 KiB
URLTransfer SizeEst Savings
static.mendeley.com/md-stitch/releases/live/dist-homepage.a5a6aeee.css62.8 KiB58.7 KiB
25.7 KiB21.5 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 134.0 KiB
URLTransfer SizeEst Savings
cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js119.0 KiB62.5 KiB
assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.js106.4 KiB50.8 KiB
static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.js291.6 KiB20.8 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.

URLTransfer Size
static.mendeley.com/md-stitch/releases/live/homepage-promotional-banner.jpg8.0 MiB
static.mendeley.com/md-stitch/releases/live/blog-img-1.jpg2.1 MiB
static.mendeley.com/md-stitch/releases/live/blog-img-2.jpg1.0 MiB
static.mendeley.com/md-stitch/releases/live/blog-img-3.jpg1009.9 KiB
static.mendeley.com/md-stitch/releases/live/hero-banner.avif392.1 KiB
static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.js292.2 KiB
static.mendeley.com/md-stitch/releases/live/mendeley-mrm.avif176.2 KiB
cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js119.2 KiB
assets.adobedtm.com/4a848ae9611a/aa520520f55b/launch-62fcbdf8991d.min.js106.6 KiB
static.mendeley.com/md-stitch/releases/live/ask-my-library.avif105.0 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
Study tips for exam preparation div.blog-cards__items > div.blog-cards__item > div.blog-cards__image > img.blog-cards__img
static.mendeley.com/md-stitch/releases/live/blog-img-3.jpg
Mendeley AI tools for research efficiency div.blog-cards__items > div.blog-cards__item > div.blog-cards__image > img.blog-cards__img
static.mendeley.com/md-stitch/releases/live/blog-img-2.jpg
Mendeley AI features for research div.blog-cards__items > div.blog-cards__item > div.blog-cards__image > img.blog-cards__img
static.mendeley.com/md-stitch/releases/live/blog-img-1.jpg
Hero Banner div.hero-banner > div.hero-banner__values > picture > img.hero-banner__image
static.mendeley.com/md-stitch/releases/live/hero-banner.avif
Example of how to use mendeley ai div.text-image > div.text-image__image > picture > img.text-image__img
static.mendeley.com/md-stitch/releases/live/ask-my-library.avif
Add and organize pdf div.text-image > div.text-image__image > picture > img.text-image__img
static.mendeley.com/md-stitch/releases/live/mendeley-mrm.avif
Elsevier section.width-container-second-footer > div.elsevier-logo > a.svelte-13v4ky7 > img
static.mendeley.com/md-stitch/releases/live/elsevier-white.2f34663f.svg
RELX Group™ section.width-container-second-footer > div.relx-logo > a.svelte-13v4ky7 > img
static.mendeley.com/md-stitch/releases/live/relx.dda10e01.svg

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

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: 203 ms
URLTime Spent
mendeley.com/203 ms
www.mendeley.com/0.0 ms

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.

ElementLayout shift score
Hero Banner div.hero-banner > div.hero-banner__values > picture > img.hero-banner__image
0.247
Download for MacOS section#hero-banner > div.hero-banner > div.hero-banner__actions > a.hero-banner__download-link
0.000
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Time to Interactive 1.2 s
●Max Potential First Input Delay 20 ms
●Minify CSS
●Minify JavaScript
●JavaScript execution time 0.2 s
●Minimizes main-thread work 0.8 s
●Avoid long main-thread tasks 2 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 0 ms
●Server Backend Latencies 200 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
○User Timing marks and measures
○Avoid non-composited animations
100

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.

○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
●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.
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements 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
○`<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.
○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.
96

Best Practices

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.

SourceDescription
www.mendeley.com/undefined
Failed to load resource: the server responded with a status of 404 ()

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.

URLMap URL
static.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.jsstatic.mendeley.com/md-stitch/releases/live/dist-homepage.63e070b3.js.map
static.mendeley.com/md-stitch/releases/live/common.body-header.b3ec738d.jsstatic.mendeley.com/md-stitch/releases/live/common.body-header.b3ec738d.js.map
static.mendeley.com/md-stitch/releases/live/common.body-footer.d671cdd8.jsstatic.mendeley.com/md-stitch/releases/live/common.body-footer.d671cdd8.js.map
static.mendeley.com/md-stitch/releases/live/common.body-footer.c58113aa.jsstatic.mendeley.com/md-stitch/releases/live/common.body-footer.c58113aa.js.map
static.mendeley.com/md-stitch/releases/live/analytics.b064a903.jsstatic.mendeley.com/md-stitch/releases/live/analytics.b064a903.js.map
static.mendeley.com/md-stitch/releases/live/analytics.ac8ee480.jsstatic.mendeley.com/md-stitch/releases/live/analytics.ac8ee480.js.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
●Displays images with correct aspect ratio
●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
○Redirects HTTP traffic to HTTPS
○Detected JavaScript libraries
92

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.

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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
○Document has a valid `rel=canonical`

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