Lighthouse Desktop
· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.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.
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
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.
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.
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.
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.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Est Savings |
|---|---|
| vanilla.futurecdn.net/livescience/1610431/media/fonts/livescience.woff | 5.0 ms |
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
A series of flat red plateaus with a blue river cutting between them, creating … div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/F2wEugVw4ZEjwHXzVqgoRF-840-80.jpg.webp | 88.3 KiB | 80.2 KiB |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/Ff5QYzuLKhhc7iPKuReCrP-840-80.jpg.webp | 67.8 KiB | 59.7 KiB |
Two images side by side, the one on the left is an illustration of blue and ora… div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/7usLS9NEtwQKFienEciP9J-840-80.jpg.webp | 57.5 KiB | 50.3 KiB |
A large white bear walks on its four paws across a green and brown tundra lands… div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/BgHESbK5CdzYz2c5An4PGk-840-80.jpg.webp | 45.8 KiB | 40.0 KiB |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/g84fMXGW22yxEFvi3CFbfa-840-80.jpg.webp | 37.1 KiB | 32.5 KiB |
Satellite photo showing a lake bisecting the snowy edge of a gray ridged glacier div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/wqqB6RqDeezRgNRLz7jfdD-840-80.jpg.webp | 33.4 KiB | 29.3 KiB |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/nERaRfLTGSn5qrXMmV3mTi-840-80.jpg.webp | 33.0 KiB | 28.8 KiB |
Photograph of Lindisfarne Castle at night with the band of the Milky Way on the… div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/m3hN2hwAjdhWwuwqLGiTWb-840-80.jpg.webp | 27.2 KiB | 23.8 KiB |
A blue and white map against a dark background. The denser areas indicate regio… div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/BcLRrTufB7CCq8C5a6Sqea-320-80.jpg.webp | 29.6 KiB | 20.2 KiB |
Two large dark holes are seen close together against a red glowing cosmic backg… div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/GwVdCy2wAw22nJtYL37UwR-840-80.jpg.webp | 23.0 KiB | 20.1 KiB |
Photo of a stream of orange fire coming from the Artemis I rocket as it launche… div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img | cdn.mos.cms.futurecdn.net/3rniEYk7aYqt2UJxxDRqBB-840-80.jpg.webp | 20.6 KiB | 18.0 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| search-api.fie.futurecdn.net/css/browser/master-f8e9977d/responsive.min.css | 10.6 KiB | 231 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| livescience.com/ | 240 ms |
| www.livescience.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
Performance issues directly impact user engagement and conversion rates.
| Element | Layout shift score |
|---|---|
head > meta head > meta | 0.204 |
More div.wrapper > div.menuitems > ul.nav-list > li.menu-item | 0.001 |
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| vanilla.futurecdn.net/livescience/1610431/media/shared/js/bundle.connect.js | 138.1 KiB | 85.4 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-WHLXGS3C>m=4e64h1 | 166.1 KiB | 83.2 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-KD4PJ8SL>m=4e64h1 | 112.0 KiB | 70.3 KiB |
| search-api.fie.futurecdn.net/js/w/es6/master-f8e9977d/responsive.js | 108.8 KiB | 67.1 KiB |
| www.googletagmanager.com/gtag/js?id=G-7ZGF1642HL&cx=c>m=4e64h1 | 145.8 KiB | 60.0 KiB |
| bordeaux.futurecdn.net/bordeaux.js | 95.1 KiB | 54.0 KiB |
| www.livescience.com/ | 57.9 KiB | 48.7 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-WWBWRXL | 143.2 KiB | 47.2 KiB |
| /livescience/1610431/media/shared/js/main.DcB9tpsv.bundle.js | 104.0 KiB | 43.5 KiB |
| pagead2.googlesyndication.com/pagead/js/adsbygoogle.js | 54.1 KiB | 35.0 KiB |
| sdk.mrf.io/statics/marfeel-sdk.js?id=7842 | 64.4 KiB | 23.3 KiB |
| www.livescience.com/vite/assets/vendor-DH-HcC7C.js | 40.4 KiB | 22.7 KiB |
| sdk.mrf.io/statics/47bd3e88b6bda15c34ce.js | 23.9 KiB | 22.1 KiB |
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
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Script Evaluation | 1.1 s |
| Other | 578 ms |
| Style & Layout | 255 ms |
| Script Parsing & Compilation | 141 ms |
| Garbage Collection | 59 ms |
| Rendering | 56 ms |
| Parse HTML & CSS | 56 ms |
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
Performance issues directly impact user engagement and conversion rates.
| Failure reason | Failure type |
|---|---|
| The page has an unload handler in the main frame. | Actionable |
| 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 |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
ARIA
Some ARIA roles have required attributes that describe the state of the element to screen readers. Learn more about roles and required attributes.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
LATEST ARTICLES div#slice-container-popularBox > section.popular-box > div.popular-box__label > div.popular-box__label__tab |
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
Contrast
Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Space ul.nav-list > li.menu-item > a > span |
Health ul.nav-list > li.menu-item > a > span |
Planet Earth ul.nav-list > li.menu-item > a > span |
Animals ul.nav-list > li.menu-item > a > span |
Archaeology ul.nav-list > li.menu-item > a > span |
Physics & Math ul.nav-list > li.menu-item > a > span |
Technology ul.nav-list > li.menu-item > a > span |
More div.wrapper > div.menuitems > ul.nav-list > li.menu-item |
TRENDING div#slice-container-trendingbar > div.trending__wrapper > nav.trending__nav > span#trending-items |
SCIENCE NEWS THIS WEEK article.search-result > div.content > p.synopsis > span.free-text-label |
EARTH FROM SPACE article.search-result > div.content > p.synopsis > span.free-text-label |
INTERVIEW article.search-result > div.content > p.synopsis > span.free-text-label |
INTERVIEW article.search-result > div.content > p.synopsis > span.free-text-label |
SCIENCE CROSSWORD article.search-result > div.content > p.synopsis > span.free-text-label |
QUIZ article.search-result > div.content > p.synopsis > span.free-text-label |
BUYING GUIDE article.search-result > div.content > p.synopsis > span.free-text-label |
BUYING GUIDE article.search-result > div.content > p.synopsis > span.free-text-label |
BUYING GUIDES article.search-result > div.content > p.synopsis > span.free-text-label |
These are opportunities to improve the legibility of your content.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > 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.
Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
NASA shuts off another Voyager 1 instrument ahead of risky 'Big Bang' maneuver … div.wdn-fte-rcr > div.list-text-links > div.listingResult > a.article-link |
Florida is facing its most intense drought in 15 years. Here's how it got so ba… div.wdn-fte-rcr > div.list-text-links > div.listingResult > a.article-link |
Neanderthal toddlers grew faster than modern humans, probably because of the ha… div.wdn-fte-rcr > div.list-text-links > div.listingResult > a.article-link |
'Nations need to prepare now': Key Atlantic ocean current is much closer to col… div.wdn-fte-rcr > div.list-text-links > div.listingResult > a.article-link |
Glowing ring of plankton surrounding New Zealand islands linked to deadly under… div.mainCarousel > section#homePageCarousel > div#Item1 > a.article-link |
Largest-ever 3D map of the universe shows 47 million galaxies, from the Milky W… div.mainCarousel > section#homePageCarousel > div#Item3 > a.article-link |
Scientists identify main cause of extreme nausea and vomiting in pregnancy
2 Co… div.mainCarousel > section#homePageCarousel > div#Item4 > a.article-link |
A giant 'shadow' has been creeping across Mars for 50 years — and scientists ar… div.mainCarousel > section#homePageCarousel > div#Item5 > a.article-link |
'The chances of you living 50 years are very small': Theoretical physicist expl… div.mainCarousel > section#homePageCarousel > div#Item6 > a.article-link |
Altar to Sol: A rare 1,900-year-old monument dedicated to the Roman god of ligh… div.mainCarousel > section#homePageCarousel > div#Item7 > a.article-link |
Can the US be trusted with the moon? A law scholar raises concerns after Artemi… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Physicists witness faster-than-light darkness pinpricks, humans found to still … section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
2 supermassive black holes may collide 100 years from now — and Earth would f… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Bright-green fireball meteor caught exploding above famous Viking raid site in … section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Northern lights may be visible from several US states Friday and Saturday as gi… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Some polar bears are adapting to their melting habitat. Will it be enough to sa… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Colorado River may have pooled and spilled over to form the Grand Canyon, solvi… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Ancient process that created rare earth elements discovered — and it could help… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Mini lake meets snowy rim of Canada's oldest ice mass
By Harry Baker published… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
'I've seen the movies. What a horrible way to die': What it's like to be sucked… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
700-year-old mummy from Bolivia contains earliest confirmed evidence of strep t… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Did King Arthur really exist?
By Owen Jarus published April 18, 2026
The stor… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Archaeologists discover perfectly circular ancient Egyptian temple that may hav… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
15 old shoes found in archaeological excavations around the world, including at… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Anglo-Saxon burial holds an older sister cradling her little brother after they… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Bruce the parrot is missing his upper beak — but that hasn't stopped him from … section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Naked mole rats wage bloody wars of succession to choose a new queen — but one … section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Can chickens really run around with their heads cut off?
By Ashley P. Taylor p… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
New study confirms lobsters feel pain, driving scientists to call for a ban on … section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Strange mammal ancestor laid huge, leathery eggs — and it was key to surviving… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Triassic croc relative from Ghost Ranch, New Mexico finally identified after ne… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Loneliness may contribute to memory issues, but not dementia — they are 'not th… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
$3 million prize goes to duo whose research led to first sickle cell CRISPR the… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
New pain-relief opioid could be much less addictive than morphine, rodent study… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Experimental drug doubles one-year survival in pancreatic cancer
By RJ Mackenz… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Science history: Doctor autopsies the brain of a man who couldn't speak — and r… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Diagnostic dilemma: A woman heard voices telling her she had a brain tumor — … section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Hackers used AI to steal hundreds of millions of Mexican government and private… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
This humanoid robot does all your housework for you — and its makers say it's… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
AI for breakup texts? How 'sycophantic' chatbots are messing with our ability t… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Physicists witness pinpricks of darkness moving faster than the speed of light
… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Physicists entangle two moving atoms for the first time, validating 'spooky' qu… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
'They are literally everywhere': The shocking story of how forever chemicals po… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Live Science crossword puzzle #40: Closest planet to the sun — 11 across
By Ha… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Artemis II quiz: Is your knowledge of NASA's historic moon mission out of this … section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Octopus quiz: Are you a sucker for cephalopod science?
By Kenna Hughes-Castleb… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Best budget fitness trackers 2026: Cheap but mighty
By Maddy Biddulph, Anna Go… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Best fitness trackers 2026: From smart rings to multisport GPS watches
By Andr… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Best sports earbuds 2026: For runners, swimmers and other fitness enthusiasts
… section.listingResultsWrapper > div.listingResults > div.listingResult > a.article-link |
Best Practices
General
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| Unload event listeners are deprecated and will be removed. |
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
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img div.image-remove-flow-width-setter > div.image-remove-reflow-container > picture > img |
Format your HTML in a way that enables crawlers to better understand your app’s content.