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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
17
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

4.59 s

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

9.01 s

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

1.19 s

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

0.687

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

4.72 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.

20.00 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 123 requests
FIX
2.9 MB transferred, 123 requests
Warning::
Page weighs 8.9 MB (2.9 MB transferred)
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Warning::
123 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.61 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
123 requests
0.61 g CO2 per page load
JavaScript 1.6 MiB 56%
Images 745.3 KiB 25%
HTML 274.1 KiB 9%
Other 113.2 KiB 4%
Fonts 68.9 KiB 2%
CSS 64.3 KiB 2%
Other 17.6 KiB 1%
Other 10.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7488ms total JS execution
FIX
7488ms total JS execution
Warning::
https://www.livescience.com/: 2563ms CPU time
Warning::
Unattributable: 1653ms CPU time
Warning::
https://cdn.privacy-mgmt.com/unified/4.40.1/usnat-...: 426ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WHL...: 360ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WWB...: 332ms CPU time
Warning::
Third-party scripts: 7488ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 26% Style & Layout 10% Script Parsing & Compilation 7% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.livescience.com/2563ms548ms98ms3rd
Unattributable1653ms533ms0ms3rd
https://cdn.privacy-mgmt.com/unified/4.40.1/usnat-uspapi.090eccada574d39af6f8.bundle.js426ms385ms28ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHLXGS3C&gtm=4e64h1360ms320ms37ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WWBWRXL332ms269ms41ms3rd
https://vanilla.futurecdn.net/livescience/1610431/media/shared/js/main.DcB9tpsv.bundle.js224ms190ms33ms3rd
https://bordeaux.futurecdn.net/bordeaux.js200ms145ms50ms3rd
https://www.livescience.com/vite/assets/vendor-DH-HcC7C.js197ms121ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7ZGF1642HL&cx=c&gtm=4e64h1197ms163ms31ms3rd
https://cdn.viafoura.net/entry/index.js181ms108ms3ms3rd

Showing top 10 of 20 scripts

F
JS Bundles
Action
60 scripts, 632 KB unused
FIX
60 scripts, 632 KB unused
Warning::
https://vanilla.futurecdn.net/livescience/1610431/...: 85 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WHL...: 83 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KD4...: 70 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7ZGF...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://bordeaux.futurecdn.net/bordeaux.js: 54 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 632 KB
632 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://vanilla.futurecdn.net/livescience/1610431/media/shared/js/bundle.connect.js139 KB85 KB (62%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHLXGS3C&gtm=4e64h1166 KB83 KB (50%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KD4PJ8SL&gtm=4e64h1112 KB70 KB (63%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7ZGF1642HL&cx=c&gtm=4e64h1146 KB60 KB (41%)✓3rd
https://bordeaux.futurecdn.net/bordeaux.js159 KB54 KB (57%)✓3rd
https://search-api.fie.futurecdn.net/js/w/es6/master-f8e9977d/responsive.js142 KB49 KB (62%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WWBWRXL144 KB47 KB (33%)✓3rd
https://vanilla.futurecdn.net/livescience/1610431/media/shared/js/main.DcB9tpsv.bundle.js105 KB44 KB (42%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js54 KB35 KB (65%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js0 KB35 KB (65%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
123 resources · 2.9 MB · 632 KB savings available
FIX
123 resources · 2.9 MB · 632 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~632 KB of savings available
Warning::
122 third-party resources (100% of weight)
Info::
2 resources over 200KB
123 resources · 2.9 MiB · 122 third-party 1.9 MiB over 1MB target
JavaScript 59% · 1.7 MiB
Image 25% · 754.9 KiB
Document 9% · 275.1 KiB
Font 2% · 68.9 KiB
CSS 2% · 64.3 KiB
Other 1% · 44.4 KiB

~631.5 KiB of savings available

Remove unused JavaScript: 631.5 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store,private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store,private

DirectiveValueMeaning
no-store—Never cache this response
private—Only browser cache, not CDN/proxy
B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 745 KB
0 oversized -0 KB
17 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
4 fonts (69 KB)
PASS
4 fonts (69 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

69 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 4.6 s LCP 9.0 shttps://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2OpenSans-400-Regular.woff2 https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2 — 20.6 KiB — 61 ms — font-display: swaphttps://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2OpenSans-600-SemiBold.w... https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2 — 20.7 KiB — 60 ms — font-display: swaphttps://vanilla.futurecdn.net/livescience/1610431/media/fonts/livescience.wofflivescience.woff https://vanilla.futurecdn.net/livescience/1610431/media/fonts/livescience.woff — 7.5 KiB — 21 ms — font-display: swaphttps://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-700-Bold.woff2OpenSans-700-Bold.woff2 https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-700-Bold.woff2 — 20.2 KiB — 10 ms — font-display: swap
OpenSans-400-Regular.woff2 woff2 swap
Size 21 KB
Load time 61 ms
Start 41 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-600-SemiBold.w... woff2 swap
Size 21 KB
Load time 60 ms
Start 41 ms
Risk FOUT — text flashes from fallback to web font
livescience.woff woff swap
Size 7 KB
Load time 21 ms
Start 305 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-700-Bold.woff2 woff2 swap
Size 20 KB
Load time 10 ms
Start 318 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~2 KB and ~4 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
18 hints, 0 missing preconnects
PASS
18 hints, 0 missing preconnects
Info::
Page uses 18 resource hint(s)

Current Resource Hints

preconnect
4
preload
3
dns-prefetch
+1
11
prefetch
—

18 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
123 requests over 31247ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s FCP 4.6 s LCP 9.0 shttps://livescience.com// https://livescience.com/ — 301 — 268 B — 9 ms — h2https://www.livescience.com/www.livescience.com/ https://www.livescience.com/ — 200 — 271.8 KiB — 16 ms — h2https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2vanilla.futurecdn.net/livescience/1... https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-400-Regular.woff2 — 200 — 20.6 KiB — 61 ms — h3https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2vanilla.futurecdn.net/livescience/1... https://vanilla.futurecdn.net/livescience/1610431/media/shared/fonts/OpenSans-600-SemiBold.woff2 — 200 — 20.7 KiB — 60 ms — h3https://vanilla.futurecdn.net/livescience/1610431/media/css/livescience.min.cssvanilla.futurecdn.net/livescience/1... https://vanilla.futurecdn.net/livescience/1610431/media/css/livescience.min.css — 200 — 47.1 KiB — 68 ms — h3https://www.livescience.com/vite/assets/reduxStore-Cn5mFc99.jswww.livescience.com/vite/assets/red... https://www.livescience.com/vite/assets/reduxStore-Cn5mFc99.js — 200 — 4.5 KiB — 11 ms — h2https://www.livescience.com/vite/assets/main-Cm0XM4Nt.jswww.livescience.com/vite/assets/mai... https://www.livescience.com/vite/assets/main-Cm0XM4Nt.js — 200 — 2.9 KiB — 20 ms — h2https://www.livescience.com/vite/assets/Flexi/Widgets/Carouzelize.ts-BQCnpvGa.jswww.livescience.com/vite/assets/Fle... https://www.livescience.com/vite/assets/Flexi/Widgets/Carouzelize.ts-BQCnpvGa.js — 200 — 1.3 KiB — 13 ms — h2https://www.livescience.com/vite/assets/Ads/Ads.ts-CCQdtPIk.jswww.livescience.com/vite/assets/Ads... https://www.livescience.com/vite/assets/Ads/Ads.ts-CCQdtPIk.js — 200 — 713 B — 20 ms — h2https://www.livescience.com/vite/assets/Viafoura/EntryScript/EntryScript.ts-ozopKOza.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/EntryScript/EntryScript.ts-ozopKOza.js — 200 — 880 B — 17 ms — h2https://www.livescience.com/vite/assets/Footer/ccpa-footer-link.ts-B9_pzN11.jswww.livescience.com/vite/assets/Foo... https://www.livescience.com/vite/assets/Footer/ccpa-footer-link.ts-B9_pzN11.js — 200 — 908 B — 18 ms — h2https://www.livescience.com/vite/assets/Footer/gdpr-footer-link.ts-BYKQRecd.jswww.livescience.com/vite/assets/Foo... https://www.livescience.com/vite/assets/Footer/gdpr-footer-link.ts-BYKQRecd.js — 200 — 1.0 KiB — 15 ms — h2https://search-api.fie.futurecdn.net/css/browser/master-f8e9977d/responsive.min.csssearch-api.fie.futurecdn.net/css/br... https://search-api.fie.futurecdn.net/css/browser/master-f8e9977d/responsive.min.css — 200 — 10.6 KiB — 76 ms — h2https://cdn.mos.cms.futurecdn.net/flexiimages/mqlcl6p9ca1767779103.jpgcdn.mos.cms.futurecdn.net/flexiimag... https://cdn.mos.cms.futurecdn.net/flexiimages/mqlcl6p9ca1767779103.jpg — 200 — 574.0 KiB — 234 ms — h3https://cdn.mos.cms.futurecdn.net/flexiimages/9g8bisxmnt1764585116.pngcdn.mos.cms.futurecdn.net/flexiimag... https://cdn.mos.cms.futurecdn.net/flexiimages/9g8bisxmnt1764585116.png — 200 — 4.3 KiB — 162 ms — h3https://www.livescience.com/media/img/ls-logo-w.svgwww.livescience.com/media/img/ls-lo... https://www.livescience.com/media/img/ls-logo-w.svg — 200 — 1.4 KiB — 5 ms — h2https://search-api.fie.futurecdn.net/js/w/es6/master-f8e9977d/hawklinks.jssearch-api.fie.futurecdn.net/js/w/e... https://search-api.fie.futurecdn.net/js/w/es6/master-f8e9977d/hawklinks.js — 200 — 39.1 KiB — 210 ms — h2https://www.livescience.com/vite/assets/vendor-DH-HcC7C.jswww.livescience.com/vite/assets/ven... https://www.livescience.com/vite/assets/vendor-DH-HcC7C.js — 200 — 41.2 KiB — 123 ms — h3https://www.livescience.com/vite/assets/cookies-Btke1V1y.jswww.livescience.com/vite/assets/coo... https://www.livescience.com/vite/assets/cookies-Btke1V1y.js — 200 — 1.0 KiB — 109 ms — h3https://www.livescience.com/vite/assets/screen-size-Dw4LJ_p1.jswww.livescience.com/vite/assets/scr... https://www.livescience.com/vite/assets/screen-size-Dw4LJ_p1.js — 200 — 921 B — 111 ms — h3https://www.livescience.com/vite/assets/Viafoura/Core/Bootstrap.ts-DvK5nHUP.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/Core/Bootstrap.ts-DvK5nHUP.js — 200 — 1.6 KiB — 110 ms — h3https://www.livescience.com/vite/assets/Viafoura/Core/Stores.ts-Dp1sBDsE.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/Core/Stores.ts-Dp1sBDsE.js — 200 — 2.0 KiB — 110 ms — h3https://www.livescience.com/vite/assets/Viafoura/Comments/CountLink/CountLink.ts-nV82bCAr.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/Comments/CountLink/CountLink.ts-nV82bCAr.js — 200 — 1.3 KiB — 110 ms — h3https://www.livescience.com/vite/assets/Viafoura/Comments/Comments.ts-DOox6pdt.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/Comments/Comments.ts-DOox6pdt.js — 200 — 1.9 KiB — 109 ms — h3https://www.livescience.com/vite/assets/Viafoura/Comments/Count/Count.ts-CmfM_rQv.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/Comments/Count/Count.ts-CmfM_rQv.js — 200 — 1.2 KiB — 108 ms — h3https://www.livescience.com/vite/assets/Viafoura/Core/Utils.ts-DZv0MjoV.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/Core/Utils.ts-DZv0MjoV.js — 200 — 1005 B — 107 ms — h3https://www.livescience.com/vite/assets/debouncer-DovBpx4g.jswww.livescience.com/vite/assets/deb... https://www.livescience.com/vite/assets/debouncer-DovBpx4g.js — 200 — 889 B — 107 ms — h3https://www.livescience.com/vite/assets/Viafoura/Comments/Utils.ts-CSU2Uh-M.jswww.livescience.com/vite/assets/Via... https://www.livescience.com/vite/assets/Viafoura/Comments/Utils.ts-CSU2Uh-M.js — 200 — 1.0 KiB — 107 ms — h3https://www.livescience.com/vite/assets/Util/Truncate/Truncate.ts-CQ1SA-K5.jswww.livescience.com/vite/assets/Uti... https://www.livescience.com/vite/assets/Util/Truncate/Truncate.ts-CQ1SA-K5.js — 200 — 1.2 KiB — 107 ms — h3https://www.livescience.com/vite/assets/observeStore-BFjnUjC2.jswww.livescience.com/vite/assets/obs... https://www.livescience.com/vite/assets/observeStore-BFjnUjC2.js — 200 — 922 B — 106 ms — h3
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https://region1.google-analytics.com/g/collect?v=2&tid=G-7ZGF1642HL&gtm=45je64h1v868802063z8896039803za20gzb896039803zd896039803&_p=1776798898140&gcs=G101&gcd=13q3tPq2q5l1&npa=1&dma_cps=-&dma=1&tcfd=1065r&_eu=AAAAAGA&are=1&cid=1098649288.1776798900&frm=0&pscdl=denied&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117384405&sid=1776798899&sct=1&seg=0&dl=https%3A%2F%2Fwww.livescience.com%2F&dt=Live%20Science%20%7C%20Latest%20science%20news%20and%20articles%20for%20those%20with%20curious%20minds&_tu=SA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.debug_parameter=&ep.content_article_author=&ep.content_article_id=not%20found%3A%20null&ep.content_language=not%20found%3A%20null&ep.content_publish_date=not%20found%3A%20null-not%20found%3A%20null-not%20found%3A%20null&ep.content_update_date=not%20found%3A%20null-not%20found%3A%20null-not%20found%3A%20null&ep.content_vertical=&ep.content_vertical_sub=&ep.gtm_container_version=GTM-WWBWRXL%7C227&ep.page_category=not%20found%3A%20null&epn.page_index=0&ep.page_number=1&ep.page_tags=&ep.cms_page_title=Live%20Science%20%7C%20Latest%20science%20news%20and%20articles%20for%20those%20with%20curious%20minds&ep.page_type=homepage&ep.page_url=https%3A%2F%2Fwww.livescience.com&ep.page_viewtype=pageLoad&ep.product_1_brand=not%20found%3A%20null&ep.product_1_category=not%20found%3A%20null&ep.product_1_name=not%20found%3A%20null&ep.product_2_brands=&ep.product_2_products=&ep.product_source=&ep.site_brand=livescience&ep.site_region=US&ep.page_country_code=FR&ep.vanilla_session_id=01KPRQF6AFD36ZEBQ2V81GWE6D&ep.logged_in_event=false&ep.screen_res_internal=412x823&ep.text_snippet=&up.logged_in=false&up.cmp_region=gdpr&upn.cmp_consented_purp_count=0&up.cmp_consented_purpose_ids=&up.cmp_purpose_leg_int_count=&tfd=1873 — 204 — 552 B — 161 ms — h2https://sb.scorecardresearch.com/cs/10055482/beacon.jssb.scorecardresearch.com/cs/1005548... https://sb.scorecardresearch.com/cs/10055482/beacon.js — 302 — 266 B — 80 ms — h2https://sb.scorecardresearch.com/internal-cs/default/beacon-and.jssb.scorecardresearch.com/internal-c... https://sb.scorecardresearch.com/internal-cs/default/beacon-and.js — 200 — 7.8 KiB — 3 ms — h2https://events.newsroom.bi/ingest.phpevents.newsroom.bi/ingest.php https://events.newsroom.bi/ingest.php — 200 — 540 B — 120 ms — 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https://events.newsroom.bi/recirculation/recirculation.php — 200 — 438 B — 41 ms — h2https://events.newsroom.bi/ingest.phpevents.newsroom.bi/ingest.php https://events.newsroom.bi/ingest.php — 200 — 427 B — 22 ms — h2https://events.newsroom.bi/ingest.phpevents.newsroom.bi/ingest.php https://events.newsroom.bi/ingest.php — 200 — 427 B — 23 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 7488ms · 1685KB · €81/mo
www.livescience.com
Other
Costly
Execution 2563ms
Transfer 272 KB
Monthly Cost €28/mo
Unattributable
Other
Costly
Execution 1653ms
Transfer 0 KB
Monthly Cost €18/mo
cdn.privacy-mgmt.com
Other
Costly
Execution 426ms
Transfer 34 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 360ms
Transfer 166 KB
Unused 50%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 332ms
Transfer 144 KB
Unused 33%
Monthly Cost €4/mo
vanilla.futurecdn.net
Other
Costly
Execution 224ms
Transfer 105 KB
Unused 42%
Monthly Cost €2/mo
bordeaux.futurecdn.net
Other
Costly
Execution 200ms
Transfer 159 KB
Unused 57%
Monthly Cost €2/mo
www.livescience.com
Other
Optional
Execution 197ms
Transfer 41 KB
Unused 57%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 197ms
Transfer 146 KB
Unused 41%
Monthly Cost €2/mo
cdn.viafoura.net
Other
Optional
Execution 181ms
Transfer 16 KB
Monthly Cost €2/mo
search-api.fie.futurecdn.net
Other
Optional
Execution 153ms
Transfer 142 KB
Unused 62%
Monthly Cost €2/mo
vanilla.futurecdn.net
Other
Optional
Execution 152ms
Transfer 139 KB
Unused 62%
Monthly Cost €2/mo
sdk.mrf.io
Other
Optional
Execution 141ms
Transfer 65 KB
Unused 36%
Monthly Cost €2/mo
sb.scorecardresearch.com
Other
Optional
Execution 138ms
Transfer 0 KB
Monthly Cost €2/mo
cdn.privacy-mgmt.com
Other
Optional
Execution 114ms
Transfer 42 KB
Monthly Cost €1/mo
pagead2.googlesyndication.com
Other
Optional
Execution 105ms
Transfer 0 KB
Unused 65%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 112 KB
Unused 63%
Monthly Cost €1/mo
html-load.com
Other
Optional
Execution 96ms
Transfer 42 KB
Monthly Cost €1/mo
freyr.futurecdn.net
Other
Optional
Execution 82ms
Transfer 22 KB
Monthly Cost €1/mo
slice.vanilla.futurecdn.net
Other
Optional
Execution 73ms
Transfer 39 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.livescience.com adds 2563ms and costs ~€28/month
  • Unattributable adds 1653ms and costs ~€18/month
  • cdn.privacy-mgmt.com adds 426ms and costs ~€5/month
  • Google Tag Manager adds 360ms and costs ~€4/month
  • Google Tag Manager adds 332ms and costs ~€4/month
  • vanilla.futurecdn.net adds 224ms and costs ~€2/month
  • bordeaux.futurecdn.net adds 200ms and costs ~€2/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.livescience.com takes 2563ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 1653ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.privacy-mgmt.com takes 426ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 360ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

50% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Google Tag Manager takes 332ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

vanilla.futurecdn.net takes 224ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

bordeaux.futurecdn.net takes 200ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

57% of bordeaux.futurecdn.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

57% of www.livescience.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

62% of search-api.fie.futurecdn.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

62% of vanilla.futurecdn.net's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

65% of pagead2.googlesyndication.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

63% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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