C — https://newscientist.com

Site Health

Score: 72 / 100

Based on 8 categories, 0 sections

Room to improve — your 28.9s load time is above Google's 2.5s 'Good' threshold.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Well-optimized for search — your content is discoverable.

Good server performance with room for optimization.

Mostly compliant — a few items need attention.

Rich content metadata — your pages look great everywhere.

Heavier than average — reducing page weight saves energy and bandwidth.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

WordPress · 253 peers

You 72

Avg 74

At average

0 50 100

Better than 18% of WordPress sites See full WordPress benchmark →

Adobe Fonts · 83 peers

You 72

Avg 73

At average

0 50 100

Better than 22% of Adobe Fonts sites See full Adobe Fonts benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

4 image-only link(s) without alt text

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Link & Button Quality

327 third-party resources (100% of weight)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Inventory

328 HTTP requests — consider bundling or reducing

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

Embed this badge

Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fnewscientist.com)](https://beavercheck.com/results/5f321a1d-44a5-41a3-9e71-b9c193be65da)

HTML

<a href="https://beavercheck.com/results/5f321a1d-44a5-41a3-9e71-b9c193be65da"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fnewscientist.com" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fnewscientist.com

This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 28.9s exceeds Google's 2.5s 'Good' threshold and the 2 performance issues below directly contribute to it. Addressing the critical issues below would have the most immediate impact on your user trust.

2 security gaps detected — browsers may warn visitors about your site.

1 accessibility issue excludes users who rely on assistive technology.

Your LCP is 28.9s — fixing the 2 performance criticals could bring it under Google's 2.5s 'Good' threshold.

Conversion Barriers

2 critical 3 warning

5 barrier(s) likely increasing bounce by ~25%.

Speed (2)

Page takes 28.9s to load

+12% bounce

Users abandon at ~3s — you're 26.4s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Page feels frozen for 4.6s

+5% bounce

Clicks on the primary CTA are ignored while JavaScript runs

Fix: Break up long tasks; defer non-critical JavaScript to post-hydration

Trust (2)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Navigation (1)

1 broken link(s) on the page

+2% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

$650 investment → $0.97/month returns + USD 157,500 risk avoided

Payback period: > 2 years First-year ROI: -98%

Investment

$650

6h · 5 findings

Monthly returns

$0.97 /mo

~$12 / year

Bandwidth savings $0.97

Regulatory risk avoided

USD 157,500

if kept compliant

ADA Title III USD 150,000
CCPA/CPRA USD 7,500

$100 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

$650

6.5 developer hours at $100/hr

Based on United States rates ($100/hr)

Quick wins

$100 2 fixes in ~60 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

$ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

$13,126 / month at risk

~$157,512 / year if left unfixed

Compliance Risk

$157,500

ADA Title IIICCPA/CPRA

No privacy policy link detected
CCPA/CPRA: USD 2,500 – USD 7,500
1 advertising/retargeting trackers detected
CCPA/CPRA: USD 2,500 – USD 7,500
Trackers detected but no cookie policy found
CCPA/CPRA: USD 2,500 – USD 7,500

+7 more

Bandwidth Waste

$0.97 /mo

12150.2 MB/mo × 0.080 USD/GB

Optimize transfer: save ~1.2 MB per page load
Saves $0.97/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 3 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

Was this report useful?

Thanks for your feedback!

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Checking for existing audit...

Press ? for shortcuts

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

10.12 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

28.85 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

4.64 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.009

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

12.61 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

34.41 s

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

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
s.ntv.io/serve/load.js	3600.0 s	251.1 KiB
/33e288f1-17a3-4a1f-b7ab-6d5d5187c6d0-web.js	900.0 s	145.2 KiB
/scripts/2f59fd7b262f6397e696a1e932324a401ff859c8dd36797a...	3600.0 s	120.5 KiB
cdn-eu.piano.io/api/tinypass.min.js	14400.0 s	132.8 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
client.aps.amazon-adsystem.com/publisher.js	3600.0 s	82.2 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
ak.sail-horizon.com/spm/spm.v1.min.js	600.0 s	48.1 KiB
/signals/config/353120065084216?v=2.9.303&r=stable&domain...	1200.0 s	46.5 KiB
cdn.cxense.com/cx.js	3600.0 s	38.1 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js	68810.0 s	48.5 KiB
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	900.0 s	21.7 KiB
www.redditstatic.com/ads/pixel.js	60.0 s	19.0 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/polyfill.min.js	67480.0 s	41.9 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.min.js	16237.0 s	27.6 KiB
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
rta2.newscientist.com/s/rta3/rta-newscientist-3.min.js	59.0 s	8.9 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/css/mobile.css	68979.0 s	17.9 KiB
static.chartbeat.com/js/chartbeat.js	86400.0 s	16.1 KiB
tag.rmp.rakuten.com/123951.ct.js	86400.0 s	15.5 KiB
/ng/common/i18n/platform-translation-map_en_US.js?version...	86400.0 s	14.0 KiB
cdn.cxense.com/cx.cce.js	3600.0 s	6.8 KiB
eus.rubiconproject.com/usync.js	59155.0 s	11.5 KiB
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...	603716.0 s	52.6 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
static.chartbeat.com/js/chartbeat_mab.js	86400.0 s	10.1 KiB
/showtemplate/general/loadTranslationMap?aid=rba4f1Zcpe&v...	86400.0 s	9.8 KiB
buy-eu.piano.io/widget/dist/template/css/template.bundle.1.0.css	14400.0 s	5.5 KiB
experience-eu.piano.io/xbuilder/experience/load?aid=rba4f1Zcpe	1800.0 s	2.4 KiB
www.npttech.com/advertising.js	28800.0 s	3.1 KiB
cdn-ima.33across.com/ima.js	259200.0 s	6.9 KiB
config.aps.amazon-adsystem.com/configs/3065	3600.0 s	1.7 KiB
tpc.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js	1209600.0 s	8.4 KiB
applets.ebxcdn.com/ebx.js	7200.0 s	1.0 KiB
/rp.gif?ts=1776799051633&id=a2_gntgt9dbr3jj&event=PageVis...	0.0 ms	666 B
/cookie?redirect_url=https%3A%2F%2Felb.the-ozone-project....	0.0 ms	475 B
/track/cmb/generic?ttd_pid=u40cpuw&ttd_tpi=1&gdpr=0&gdpr_...	0.0 ms	253 B
/ul_cb/dsp_match/275?ssp=524&gdpr=%7Bgdpr%7D&gdpr_consent...	0.0 ms	198 B
/ul_cb/server_match?gdpr=0&gdpr_consent=&us_privacy=1YNN&...	0.0 ms	198 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	1.6 KiB
/cm-notify?pi=uk-ozone-pbs&gdpr=0&gdpr_consent=&us_privac...	0.0 ms	124 B
cdn.indexww.com/ht/htw-pixel.gif?0	86400.0 s	246 B
/p.css?s=1&k=zvd4ukw&ht=tk&f=5088.5404.4528.4549.5028.519...	604800.0 s	173 B
/tr/?id=353120065084216&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_104483&d...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_11018&dl...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_41056&dl...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_76151&dl...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_9897&dl=...	0.0 ms	16 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	0 B
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...	603716.0 s	0 B
/ng/common/i18n/platform-translation-map_en_US.js?version...	86400.0 s	0 B
/showtemplate/general/loadTranslationMap?aid=rba4f1Zcpe&v...	86400.0 s	0 B
buy-eu.piano.io/widget/dist/template/css/template.bundle.1.0.css	14400.0 s	0 B
tpc.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js	1209600.0 s	0 B
tpc.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js	1209600.0 s	0 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	0 B
/pagead/js/r20260420/r20110914/client/window_focus_fy2021.js	1209600.0 s	0 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.

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:1.635 source:map[column:39879 line:2 type:source-location url:https://www.newscientist.com/build/6603.174325d7.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:75.676 source:map[column:5404 line:0 type:source-location url:https://www.newscientist.com/build/base/homepage.7bc8d59f.js urlProvider:network]] map[reflowTime:1.635 source:map[column:39189 line:1 type:source-location url:https://www.newscientist.com/build/6603.174325d7.js urlProvider:network]]]

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
How we discovered the speed limit of arithmetic – and broke it `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/13175115/SEI_293041785.jpg?wi...	48.9 KiB	33.7 KiB
Nanodiamonds `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/20201833/SEI_293915450.jpg?wi...	38.1 KiB	27.5 KiB
A vessel heading towards the Strait of Hormuz `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/21133208/SEI_293951796.jpg?wi...	33.9 KiB	24.4 KiB
Can you determine your personalised stress score? `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/16155919/SEI_293150549.jpg?wi...	26.7 KiB	19.2 KiB
Can we ‘vaccinate’ ourselves against stress? `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/16155914/SEI_293150298.jpg?wi...	24.7 KiB	17.8 KiB
New Scientist. Science news and long reads from expert journalists, covering de… `div.MarketingPanel__ContentWrapper > div.MarketingPanel__ImageWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/15110004/nsl-launch-panel-mob...	23.5 KiB	17.3 KiB
body.jar > div#google_image_div > a#aw0 > img.img_ad `body.jar > div#google_image_div > a#aw0 > img.img_ad`	tpc.googlesyndication.com/simgad/6781207026087401362	17.9 KiB	15.3 KiB
div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/20135200/SEI_293924114.jpg?wi...	19.3 KiB	13.9 KiB
New Scientist. Science news and long reads from expert journalists, covering de… `div.MarketingPanel__CopyWrapper > div.MarketingPanel__LogoWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/16122755/ns-live-stacked-ligh...	14.1 KiB	9.0 KiB

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:342.6220002441406 label:Time to first byte subpart:timeToFirstByte] map[duration:21.602999755859376 label:Resource load delay subpart:resourceLoadDelay] map[duration:31.014 label:Resource load duration subpart:resourceLoadDuration] map[duration:2677.766 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-IMG

nodeLabel: How we discovered the speed limit of arithmetic – and broke it

path: 1,HTML,1,BODY,6,MAIN,0,DIV,0,DIV,0,DIV,0,A,0,ARTICLE,0,DIV,0,DIV,0,DIV,0,IMG

selector: div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image

snippet: <img class="Image ImageLoaded" alt="How we discovered the speed limit of arithmetic – and broke it" width="1350" height="900" src="https://images.newscientist.com/wp-content/uploads/2026/04/13175115/SEI_29…" srcset="https://images.newscientist.com/wp-content/uploads/2026/04/13175115/SEI_29…" sizes="(min-width: 1360px) 564px, (min-width: 1024px) calc(34.41vw + 89px), (min-…" loading="eager" fetchpriority="high" data-image-context="Card--Hero" data-caption="" data-credit="Renaud Vigourt" pinger-seen="true">

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

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
dmg-libs.anm.co.uk/a/1.88.0/config.js	80.0 KiB	2.3 s

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

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

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.

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: 989 ms

URL	Time Spent
newscientist.com/	989 ms
www.newscientist.com/	0.0 ms

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: 150 ms 16.4 KiB

URL	Transfer Size	Est Savings
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js	48.3 KiB	16.4 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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Estimated savings: 4.7 s 1.0 MiB

URL	Transfer Size	Est Savings
s.ntv.io/serve/load.js	250.4 KiB	190.2 KiB
dmg-libs.anm.co.uk/a/1.88.0/222.js	207.2 KiB	100.6 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...	187.4 KiB	88.5 KiB
cdn-eu.piano.io/api/tinypass.min.js	132.1 KiB	70.0 KiB
www.googletagmanager.com/gtag/js?id=G-N0NXS34EMT&cx=c&gtm=4e64h1	171.1 KiB	65.7 KiB
www.googletagmanager.com/gtag/js?id=AW-1060321608&cx=c&gtm=4e64h1	144.2 KiB	61.8 KiB
www.googletagmanager.com/gtag/js?id=DC-5181616&cx=c&gtm=4e64h1	130.0 KiB	60.4 KiB
www.googletagmanager.com/gtag/js?id=AW-10897141567&cx=c&gtm=4e64h1	137.8 KiB	53.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-TH2S733K	185.3 KiB	51.3 KiB
www.newscientist.com/build/2638.e66c3ee5.js	54.4 KiB	45.7 KiB
dmg-libs.anm.co.uk/a/1.88.0/config.js	79.8 KiB	43.3 KiB
client.aps.amazon-adsystem.com/publisher.js	81.8 KiB	33.3 KiB
ak.sail-horizon.com/spm/spm.v1.min.js	47.7 KiB	32.5 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	31.4 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	73.1 KiB	31.0 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	73.1 KiB	31.0 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	73.1 KiB	30.3 KiB
cdn.cxense.com/cx.js	37.5 KiB	24.2 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js	48.3 KiB	21.2 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
/scripts/2f59fd7b262f6397e696a1e932324a401ff859c8dd36797a...	2.0 s	1.7 s	203 ms
Unattributable	1.9 s	532 ms	0.0 ms
/33e288f1-17a3-4a1f-b7ab-6d5d5187c6d0-web.js	1.4 s	1.1 s	80 ms
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...	1.4 s	1.3 s	73 ms
www.googletagmanager.com/gtm.js?id=GTM-TH2S733K	1.3 s	1.1 s	93 ms
www.newscientist.com/build/2638.e66c3ee5.js	1.0 s	987 ms	23 ms
cdn-eu.piano.io/api/tinypass.min.js	740 ms	420 ms	57 ms
dmg-libs.anm.co.uk/a/1.88.0/config.js	604 ms	548 ms	33 ms
www.newscientist.com/	543 ms	80 ms	18 ms
dmg-libs.anm.co.uk/a/1.88.0/222.js	487 ms	402 ms	77 ms
s.ntv.io/serve/load.js	481 ms	337 ms	126 ms
www.googletagmanager.com/gtag/js?id=G-N0NXS34EMT&cx=c&gtm=4e64h1	400 ms	325 ms	65 ms
/pagead/managed/js/activeview/current/ufs_web_display.js	387 ms	323 ms	30 ms
www.newscientist.com/build/base/homepage.7bc8d59f.js	325 ms	13 ms	1.3 ms
scripts.clarity.ms/0.8.59/clarity.js	318 ms	224 ms	19 ms
client.aps.amazon-adsystem.com/publisher.js	305 ms	248 ms	42 ms
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js	305 ms	261 ms	38 ms
cdn.cxense.com/cx.js	214 ms	150 ms	15 ms
www.newscientist.com/build/6603.174325d7.js	190 ms	126 ms	6.9 ms
www.googletagmanager.com/gtag/js?id=AW-1060321608&cx=c&gtm=4e64h1	186 ms	139 ms	46 ms
www.googletagmanager.com/gtag/js?id=AW-10897141567&cx=c&gtm=4e64h1	182 ms	134 ms	46 ms
/signals/config/353120065084216?v=2.9.303&r=stable&domain...	179 ms	150 ms	26 ms
www.googletagmanager.com/gtag/js?id=DC-5181616&cx=c&gtm=4e64h1	170 ms	126 ms	43 ms
connect.facebook.net/en_US/fbevents.js	165 ms	123 ms	41 ms
fundingchoicesmessages.google.com/i/5765?ers=3	133 ms	128 ms	2.9 ms
sdk.apptentive.com/v1/sdk.min.js	131 ms	108 ms	15 ms
tag.rmp.rakuten.com/123951.ct.js	119 ms	104 ms	6.2 ms
static.chartbeat.com/js/chartbeat.js	98 ms	89 ms	5.2 ms
rta2.newscientist.com/s/rta3/rta-newscientist-3.min.js	98 ms	82 ms	3.5 ms
ep2.adtrafficquality.google/sodar/sodar2.js	96 ms	89 ms	2.8 ms
ak.sail-horizon.com/spm/spm.v1.min.js	96 ms	77 ms	17 ms
securepubads.g.doubleclick.net/tag/js/gpt.js?network-code=5765	93 ms	79 ms	13 ms
config.aps.amazon-adsystem.com/configs/3065	80 ms	74 ms	3.8 ms
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	76 ms	65 ms	9.9 ms
/t?ntv_mvi=&us_privacy=1YNN&ntv_oos=0&ntv_url=https%253A%...	70 ms	65 ms	1.2 ms
static.chartbeat.com/js/chartbeat_mab.js	70 ms	56 ms	6.6 ms
cdn-ima.33across.com/ima.js	62 ms	51 ms	3.1 ms
www.redditstatic.com/ads/pixel.js	62 ms	30 ms	8.6 ms
tpc.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite_fy2021.js	55 ms	36 ms	13 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	12.4 s
Other	2.1 s
Script Parsing & Compilation	1.3 s
Style & Layout	625 ms
Parse HTML & CSS	241 ms
Garbage Collection	217 ms
Rendering	173 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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable
The page has an unload handler in a sub frame.	Actionable

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 12.8 KiB

URL	Transfer Size	Est Savings
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/css/mobile.css	17.9 KiB	12.8 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 64.3 KiB

URL	Transfer Size	Est Savings
*,:after,:before{box-sizing:border-box} …	54.6 KiB	48.2 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/css/mobile.css	17.7 KiB	16.1 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
s.ntv.io/serve/load.js	251.1 KiB
dmg-libs.anm.co.uk/a/1.88.0/222.js	207.4 KiB
/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31...	187.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-TH2S733K	185.7 KiB
www.googletagmanager.com/gtag/js?id=G-N0NXS34EMT&cx=c&gtm=4e64h1	171.2 KiB
/33e288f1-17a3-4a1f-b7ab-6d5d5187c6d0-web.js	145.2 KiB
www.googletagmanager.com/gtag/js?id=AW-1060321608&cx=c&gtm=4e64h1	144.3 KiB
www.googletagmanager.com/gtag/js?id=AW-10897141567&cx=c&gtm=4e64h1	137.9 KiB
cdn-eu.piano.io/api/tinypass.min.js	132.8 KiB
www.googletagmanager.com/gtag/js?id=DC-5181616&cx=c&gtm=4e64h1	130.1 KiB

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

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP request discovery

●Modern HTTP

●Optimize viewport for mobile

●User Timing marks and measures 20 user timings

●Avoid long main-thread tasks 20 long tasks found

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

●Network Requests

●Network Round Trip Times 150 ms

●Server Backend Latencies 340 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 0 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○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.

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
span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info `span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info`
span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info `span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > iframe#mol-ads-cmp-iframe `body > iframe#mol-ads-cmp-iframe`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
h2.mol-ads-cmp--title > span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger `h2.mol-ads-cmp--title > span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger`
li > span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger `li > span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger`

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.

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
Humans `article.Card > div.Card__Content > div.Card__CopyWrapper > h4.Card__Category`
Physics `article.Card > div.Card__Content > div.Card__CopyWrapper > h4.Card__Category`
Weekend break `article.Card > div.Card__Content > div.Card__CopyWrapper > h4.Card__Category`

These are opportunities to improve keyboard navigation in your application.

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
Physics `section > article > h3.ThisWeeksMagazine__Category > a.ThisWeeksMagazine__CategoryLink`
Mind `section > article > h3.ThisWeeksMagazine__Category > a.ThisWeeksMagazine__CategoryLink`
Space `section > article > h3.ThisWeeksMagazine__Category > a.ThisWeeksMagazine__CategoryLink`
Mathematics `section > article > h3.ThisWeeksMagazine__Category > a.ThisWeeksMagazine__CategoryLink`

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>`

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

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

●Buttons have an accessible name

●Form elements have associated labels

●`[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

●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.

●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

●Skip links are focusable.

●Document has a main landmark.

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○Deprecated ARIA roles were not used

○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

○`[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

○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

○`<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

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○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.

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)
Piano End Banner `div.PianoOverlay__BannerWrapper > div.PianoOverlay__EndBannerCentralColumn > a.PianoOverlay__EndBannerLink > img.PianoOverlay__EndBannerImage`	/wp-content/uploads/2024/04/17102106/new-scientist-social...	1276 x 85 (15.01)	1200 x 627 (1.91)
Piano Exit Overlay Banner Mobile `body > dialog#piano-central-overlay > a.PianoOverlay__ExitOverlayLink > img.PianoOverlay__ExitOverlayMobile`	/wp-content/uploads/2024/04/17102106/new-scientist-social...	300 x 400 (0.75)	1200 x 627 (1.91)
Piano Exit Overlay Banner Desktop `body > dialog#piano-central-overlay > a.PianoOverlay__ExitOverlayLink > img.PianoOverlay__ExitOverlayDesktop`	/wp-content/uploads/2024/04/17102106/new-scientist-social...	800 x 400 (2.00)	1200 x 627 (1.91)
New Scientist. Science news and long reads from expert journalists, covering de… `div.MarketingPanel__ContentWrapper > div.MarketingPanel__ImageWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/15110004/nsl-launch-panel-mob...	752 x 494 (1.52)	800 x 602 (1.33)
New Scientist. Science news and long reads from expert journalists, covering de… `div.MarketingPanel__CopyWrapper > div.MarketingPanel__LogoWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/16122755/ns-live-stacked-ligh...	306 x 260 (1.18)	240 x 131 (1.83)

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
SharedStorage	cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js line 5340, col 64
Unload event listeners are deprecated and will be removed.	dmg-libs.anm.co.uk/a/1.88.0/config.js line 1, col 235302
AttributionReporting	www.googletagmanager.com/gtag/js?id=AW-10897141567&cx=c&gtm=4e64h1 line 562, col 244
Topics	dmg-libs.anm.co.uk/a/1.88.0/222.js line 1, col 521056

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
www.newscientist.com/	`Access to fetch at 'https://idsync.anm.co.uk/user-values/d7e774d5-ed09-463c-a83c-66af9d7938f3' from origin 'https://www.newscientist.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
idsync.anm.co.uk/user-values/d7e774d5-ed09-463c-a83c-66af9d7938f3	`Failed to load resource: net::ERR_FAILED`
www.newscientist.com/api/v1/institutions-access	`Failed to load resource: the server responded with a status of 400 ()`
www.newscientist.com/api/v1/user-tokens	`Failed to load resource: the server responded with a status of 401 ()`
dmg-libs.anm.co.uk/a/1.88.0/config.js line 1, col 35451	`Uncaught (in promise) TypeError: Failed to fetch`

●Uses HTTPS

●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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○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 may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
`section#piano-end-banner > div.PianoOverlay__BannerWrapper > div.PianoOverlay__EndBannerCentralColumn > a.PianoOverlay__EndBannerLink`
`body > dialog#piano-central-overlay > a.PianoOverlay__ExitOverlayLink`
View more info `div.mol-ads-cmp--button-privacy-link-group > div.mol-ads-ccpa--message > u > a`

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
span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info `span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info`
span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info `span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info`

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

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.31 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

4.42 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

547 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.061

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.04 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

8.59 s

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.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

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
s.ntv.io/serve/load.js	3600.0 s	251.1 KiB
/33e288f1-17a3-4a1f-b7ab-6d5d5187c6d0-web.js	900.0 s	145.2 KiB
cdn.pathtosuccess.global/DV_GlobalPassback_Update_728x90.jpg	0.0 ms	104.1 KiB
/scripts/2f59fd7b262f6397e696a1e932324a401ff859c8dd36797a...	3600.0 s	120.5 KiB
cdn-eu.piano.io/api/tinypass.min.js	14400.0 s	132.9 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
client.aps.amazon-adsystem.com/publisher.js	3600.0 s	82.2 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js?...	3600.0 s	73.1 KiB
ak.sail-horizon.com/spm/spm.v1.min.js	600.0 s	48.1 KiB
/signals/config/353120065084216?v=2.9.303&r=stable&domain...	1200.0 s	46.5 KiB
cdn.cxense.com/cx.js	3600.0 s	38.1 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js	68776.0 s	48.5 KiB
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	900.0 s	21.7 KiB
www.redditstatic.com/ads/pixel.js	60.0 s	19.0 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/polyfill.min.js	67445.0 s	41.9 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.min.js	16203.0 s	27.6 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	3000.0 s	14.0 KiB
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/css/desktop.css	40905.0 s	18.7 KiB
rta2.newscientist.com/s/rta3/rta-newscientist-3.min.js	25.0 s	8.9 KiB
c.amazon-adsystem.com/bao-csm/direct/csm_othersv6.js	86400.0 s	18.2 KiB
static.chartbeat.com/js/chartbeat.js	86400.0 s	16.1 KiB
tag.rmp.rakuten.com/123951.ct.js	86400.0 s	15.5 KiB
/ng/common/i18n/platform-translation-map_en_US.js?version...	86400.0 s	14.0 KiB
cdn.cxense.com/cx.cce.js	3600.0 s	6.8 KiB
eus.rubiconproject.com/usync.js	55647.0 s	11.5 KiB
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...	603682.0 s	52.6 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
static.chartbeat.com/js/chartbeat_mab.js	86400.0 s	10.1 KiB
/showtemplate/general/loadTranslationMap?aid=rba4f1Zcpe&v...	86400.0 s	9.8 KiB
buy-eu.piano.io/widget/dist/template/css/template.bundle.1.0.css	14400.0 s	5.5 KiB
ib.3lift.com/ttj?inv_code=New_Scientist_ROS_Display_Catchall_TAM	3600.0 s	2.7 KiB
experience-eu.piano.io/xbuilder/experience/load?aid=rba4f1Zcpe	1800.0 s	2.4 KiB
www.npttech.com/advertising.js	28800.0 s	3.1 KiB
cdn-ima.33across.com/ima.js	259200.0 s	6.9 KiB
config.aps.amazon-adsystem.com/configs/3065	3600.0 s	1.7 KiB
pagead2.googlesyndication.com/pagead/js/r20260420/r20110914/abg_lite.js	1209600.0 s	10.5 KiB
applets.ebxcdn.com/ebx.js	7200.0 s	1005 B
/rp.gif?ts=1776799085792&id=a2_gntgt9dbr3jj&event=PageVis...	0.0 ms	666 B
/dvbs_src.js?ctx=30106817&cmp=177272&sid=a1ccb9534a444b7&...	86400.0 s	1.3 KiB
/e/dtb/imp?b=AWF5rSp0w0gbm8hoQmxZacpU4XbFtHZGk7WIB0BNwGKR...	0.0 ms	329 B
/track/cmb/generic?ttd_pid=u40cpuw&ttd_tpi=1&gdpr=0&gdpr_...	0.0 ms	254 B
/ul_cb/server_match?gdpr=0&gdpr_consent=&us_privacy=1YNN&...	0.0 ms	198 B
/ul_cb/dsp_match/275?ssp=524&gdpr=%7Bgdpr%7D&gdpr_consent...	0.0 ms	198 B
/cm-notify?pi=uk-ozone-pbs&gdpr=0&gdpr_consent=&us_privac...	0.0 ms	124 B
cdn.indexww.com/ht/htw-pixel.gif?0	86400.0 s	223 B
ib.3lift.com/static/buttons/edaa/OBA_UK.webp	604800.0 s	690 B
ib.3lift.com/static/buttons/edaa/OBA_TRANS.webp	604800.0 s	569 B
/tr/?id=353120065084216&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	19 B
/p.css?s=1&k=zvd4ukw&ht=tk&f=5088.5404.4528.4549.5028.519...	604800.0 s	172 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_104483&d...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_11018&dl...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_41056&dl...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_76151&dl...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry&dl=https...	0.0 ms	16 B
/tr/?id=353120065084216&ev=PermutiveSegmentEntry_9897&dl=...	0.0 ms	16 B
/_sam/H4sIAAAAAAAA_z3IwQ6AIAgA0B9KmJ76m4bJHI6oBa7f7-bt7eE...	603682.0 s	0 B
/ng/common/i18n/platform-translation-map_en_US.js?version...	86400.0 s	0 B
/showtemplate/general/loadTranslationMap?aid=rba4f1Zcpe&v...	86400.0 s	0 B
buy-eu.piano.io/widget/dist/template/css/template.bundle.1.0.css	14400.0 s	0 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.

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.

title: Preconnected origins

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
dmg-libs.anm.co.uk/a/1.88.0/config.js	80.0 KiB	473 ms

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
Sign in `div.TopNav > div.TopNav__ToolsWrapper > a.TopNav__SignIn > span.TopNav__SignInText`	cdn.pathtosuccess.global/DV_GlobalPassback_Update_728x90.jpg	103.7 KiB	93.0 KiB
New Scientist. Science news and long reads from expert journalists, covering de… `div.MarketingPanel__ContentWrapper > div.MarketingPanel__ImageWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/15121506/nsl-launch-desktop.p...	99.0 KiB	31.7 KiB
New Scientist. Science news and long reads from expert journalists, covering de… `section.EditorialPanel > div.EditorialPanel__ImageWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/03/04164312/editorial-panel-roma...	75.5 KiB	19.4 KiB
div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/02/11130542/SEI_284490516.jpg?wi...	31.5 KiB	17.7 KiB
div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/08204052/SEI_292410310.jpg?wi...	23.0 KiB	9.5 KiB
New Scientist. Science news and long reads from expert journalists, covering de… `div.MarketingPanel__CopyWrapper > div.MarketingPanel__LogoWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/16122755/ns-live-stacked-ligh...	6.5 KiB	5.3 KiB
Abstract system of quantum computing `div.Card__ImageWrapper > div.Card__ImageOverflow > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/17211351/SEI_293537576.jpg?wi...	11.8 KiB	4.7 KiB
New Scientist. Science news and long reads from expert journalists, covering de… `div.MarketingPanel__CopyWrapper > div.MarketingPanel__LogoWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2023/12/22132028/discovery-tours-logo...	6.5 KiB	4.5 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: 470 ms

URL	Time Spent
newscientist.com/	470 ms
www.newscientist.com/	0.0 ms

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

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

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: 50 ms 13.3 KiB

URL	Transfer Size	Est Savings
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/css/desktop.css	18.7 KiB	13.3 KiB

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: 40 ms 16.4 KiB

URL	Transfer Size	Est Savings
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js	48.3 KiB	16.4 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: 50 ms 62.9 KiB

URL	Transfer Size	Est Savings
*,:after,:before{box-sizing:border-box} …	54.4 KiB	45.6 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/css/desktop.css	18.5 KiB	17.3 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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

Source: Google web.dev / Lighthouse

Estimated savings: 630 ms 1003.8 KiB

URL	Transfer Size	Est Savings
s.ntv.io/serve/load.js	250.4 KiB	190.2 KiB
dmg-libs.anm.co.uk/a/1.88.0/222.js	207.2 KiB	101.9 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	187.7 KiB	87.4 KiB
cdn-eu.piano.io/api/tinypass.min.js	132.2 KiB	70.1 KiB
www.googletagmanager.com/gtag/js?id=G-N0NXS34EMT&cx=c&gtm=4e64h1	171.2 KiB	65.7 KiB
www.googletagmanager.com/gtag/js?id=DC-5181616&cx=c&gtm=4e64h1	130.0 KiB	62.5 KiB
www.googletagmanager.com/gtag/js?id=AW-1060321608&cx=c&gtm=4e64h1	144.2 KiB	60.9 KiB
www.googletagmanager.com/gtag/js?id=AW-10897141567&cx=c&gtm=4e64h1	137.8 KiB	53.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-TH2S733K	185.3 KiB	51.1 KiB
www.newscientist.com/build/2638.e66c3ee5.js	54.4 KiB	45.7 KiB
dmg-libs.anm.co.uk/a/1.88.0/config.js	79.8 KiB	43.3 KiB
ak.sail-horizon.com/spm/spm.v1.min.js	47.7 KiB	32.5 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	31.8 KiB
client.aps.amazon-adsystem.com/publisher.js	81.8 KiB	31.4 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	73.1 KiB	30.3 KiB
cdn.cxense.com/cx.js	37.5 KiB	24.6 KiB
cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js	48.3 KiB	21.2 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
Unattributable	411 ms	110 ms	0.0 ms
www.newscientist.com/	381 ms	23 ms	5.6 ms
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	346 ms	310 ms	18 ms
/33e288f1-17a3-4a1f-b7ab-6d5d5187c6d0-web.js	322 ms	246 ms	20 ms
www.googletagmanager.com/gtm.js?id=GTM-TH2S733K	294 ms	237 ms	30 ms
www.newscientist.com/build/2638.e66c3ee5.js	235 ms	225 ms	5.2 ms
/scripts/2f59fd7b262f6397e696a1e932324a401ff859c8dd36797a...	207 ms	182 ms	15 ms
cdn-eu.piano.io/api/tinypass.min.js	164 ms	113 ms	13 ms
dmg-libs.anm.co.uk/a/1.88.0/config.js	160 ms	149 ms	7.8 ms
s.ntv.io/serve/load.js	140 ms	85 ms	28 ms
dmg-libs.anm.co.uk/a/1.88.0/222.js	126 ms	100 ms	24 ms
www.googletagmanager.com/gtag/js?id=G-N0NXS34EMT&cx=c&gtm=4e64h1	117 ms	87 ms	16 ms
client.aps.amazon-adsystem.com/publisher.js	107 ms	93 ms	10 ms
www.googletagmanager.com/gtag/js?id=AW-1060321608&cx=c&gtm=4e64h1	103 ms	89 ms	12 ms
/pagead/managed/js/activeview/current/ufs_web_display.js	89 ms	78 ms	7.1 ms
scripts.clarity.ms/0.8.59/clarity.js	84 ms	71 ms	2.5 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	2.8 s
Other	495 ms
Script Parsing & Compilation	299 ms
Style & Layout	197 ms
Garbage Collection	94 ms
Rendering	72 ms
Parse HTML & CSS	62 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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable
The page has an unload handler in a sub frame.	Actionable

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
s.ntv.io/serve/load.js	251.1 KiB
dmg-libs.anm.co.uk/a/1.88.0/222.js	207.4 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	187.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-TH2S733K	185.7 KiB
www.googletagmanager.com/gtag/js?id=G-N0NXS34EMT&cx=c&gtm=4e64h1	171.2 KiB
/33e288f1-17a3-4a1f-b7ab-6d5d5187c6d0-web.js	145.2 KiB
www.googletagmanager.com/gtag/js?id=AW-1060321608&cx=c&gtm=4e64h1	144.3 KiB
www.googletagmanager.com/gtag/js?id=AW-10897141567&cx=c&gtm=4e64h1	137.9 KiB
cdn-eu.piano.io/api/tinypass.min.js	132.9 KiB
www.googletagmanager.com/gtag/js?id=DC-5181616&cx=c&gtm=4e64h1	130.1 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
Newsletter sign up graphic `section.NewslettersPanel > div.NewslettersPanel__ImageWrapper > div.Grid__Row > img.NewslettersPanel__Image`	/build/images/newsletter/newsletter-component-screen-grap...

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

●Layout shift culprits

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●User Timing marks and measures 48 user timings

●Avoid long main-thread tasks 13 long tasks found

●Network Requests

●Network Round Trip Times 80 ms

●Server Backend Latencies 290 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 0 ms

●Avoid large layout shifts 3 layout shifts found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

Accessibility

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
span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info `span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info`
span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info `span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body > iframe#mol-ads-cmp-iframe `body > iframe#mol-ads-cmp-iframe`

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
h2.mol-ads-cmp--title > span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger `h2.mol-ads-cmp--title > span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger`
li > span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger `li > span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger`

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.

Navigation

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Humans `article.Card > div.Card__Content > div.Card__CopyWrapper > h4.Card__Category`
Physics `article.Card > div.Card__Content > div.Card__CopyWrapper > h4.Card__Category`
Weekend break `article.Card > div.Card__Content > div.Card__CopyWrapper > h4.Card__Category`

These are opportunities to improve keyboard navigation in your application.

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
Physics `section > article > h3.ThisWeeksMagazine__Category > a.ThisWeeksMagazine__CategoryLink`
Mind `section > article > h3.ThisWeeksMagazine__Category > a.ThisWeeksMagazine__CategoryLink`
Space `section > article > h3.ThisWeeksMagazine__Category > a.ThisWeeksMagazine__CategoryLink`
Mathematics `section > article > h3.ThisWeeksMagazine__Category > a.ThisWeeksMagazine__CategoryLink`

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>`

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

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

●Buttons have an accessible name

●Form elements have associated labels

●`[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

●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.

●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

●Skip links are focusable.

●Document has a main landmark.

●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

○Deprecated ARIA roles were not used

○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

○`[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

○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

○`<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

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○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.

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)
Piano End Banner `div.PianoOverlay__BannerWrapper > div.PianoOverlay__EndBannerCentralColumn > a.PianoOverlay__EndBannerLink > img.PianoOverlay__EndBannerImage`	/wp-content/uploads/2024/04/17102106/new-scientist-social...	1276 x 85 (15.01)	1200 x 627 (1.91)
Piano Exit Overlay Banner Mobile `body > dialog#piano-central-overlay > a.PianoOverlay__ExitOverlayLink > img.PianoOverlay__ExitOverlayMobile`	/wp-content/uploads/2024/04/17102106/new-scientist-social...	300 x 400 (0.75)	1200 x 627 (1.91)
New Scientist. Science news and long reads from expert journalists, covering de… `div.MarketingPanel__CopyWrapper > div.MarketingPanel__LogoWrapper > div.Image__Wrapper > img.Image`	/wp-content/uploads/2026/04/16122755/ns-live-stacked-ligh...	306 x 260 (1.18)	120 x 65 (1.85)

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
SharedStorage	cmp.dmgmediaprivacy.co.uk/ccpa/2.8.18-ccpa-46/iife/mol-ads-cmp.js line 5340, col 64
Unload event listeners are deprecated and will be removed.	dmg-libs.anm.co.uk/a/1.88.0/config.js line 1, col 235302
AttributionReporting	www.googletagmanager.com/gtag/js?id=AW-10897141567&cx=c&gtm=4e64h1 line 562, col 244
Topics	dmg-libs.anm.co.uk/a/1.88.0/222.js line 1, col 521056

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
www.newscientist.com/	`Access to fetch at 'https://idsync.anm.co.uk/user-values/b391ced6-a283-4a28-b039-509eadc89c21' from origin 'https://www.newscientist.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
idsync.anm.co.uk/user-values/b391ced6-a283-4a28-b039-509eadc89c21	`Failed to load resource: net::ERR_FAILED`
www.newscientist.com/api/v1/institutions-access	`Failed to load resource: the server responded with a status of 400 ()`
www.newscientist.com/api/v1/user-tokens	`Failed to load resource: the server responded with a status of 401 ()`
www.newscientist.com/ line 29, col 3875	`Iframe not found after maximum retries.`
dmg-libs.anm.co.uk/a/1.88.0/config.js line 1, col 35451	`Uncaught (in promise) TypeError: Failed to fetch`

●Uses HTTPS

●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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

SEO

Crawling and Indexing

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
`section#piano-end-banner > div.PianoOverlay__BannerWrapper > div.PianoOverlay__EndBannerCentralColumn > a.PianoOverlay__EndBannerLink`
`body > dialog#piano-central-overlay > a.PianoOverlay__ExitOverlayLink`
View more info `div.mol-ads-cmp--button-privacy-link-group > div.mol-ads-ccpa--message > u > a`

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
span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info `span.mol-ads-cmp--nobr > span.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info`
span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info `span.mol-ads-cmp--nobr > div.mol-ads-cmp--tooltip > a.mol-ads-cmp--tooltip-trigger > img.mol-ads-cmp--info`

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

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Results for https://newscientist.com

Site Health

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Top Priorities (5)

Fix Priority Matrix

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Strategic

Easy Improvements

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What fixing these means

Conversion Barriers

Speed (2)

Trust (2)

Navigation (1)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Estimated Remediation Cost

Cost by category

Cost by effort level

What Inaction Is Costing You

Compliance Risk

Bandwidth Waste

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Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

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Best practices

Best Practices

User Experience

General

SEO

Crawling and Indexing

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Navigation

Best practices

Best Practices

User Experience

General

SEO

Crawling and Indexing

Content Best Practices

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