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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

837 ms

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

1.57 s

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

29 ms

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

0.002

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

916 ms

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

3.24 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
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 91 requests
FIX
2.9 MB transferred, 91 requests
Warning::
Page weighs 10.9 MB (2.9 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Warning::
Images are 1.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.0 MB
Info::
91 HTTP requests
Info::
Estimated 0.61 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
91 requests
0.61 g CO2 per page load
JavaScript 1.4 MiB 47%
Images 1.0 MiB 36%
HTML 160.1 KiB 5%
Fonts 157.3 KiB 5%
CSS 139.0 KiB 5%
Other 33.4 KiB 1%
Other 5.5 KiB 0%
Other 1.1 KiB 0%
Other 561 B 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

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

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
D
Page Weight Inventory
Action
91 resources · 2.9 MB · 240 KB savings available
FIX
91 resources · 2.9 MB · 240 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~240 KB of savings available
Warning::
90 third-party resources (100% of weight)
Info::
2 resources over 200KB
91 resources · 2.9 MiB · 90 third-party 1.9 MiB over 1MB target
JavaScript 47% · 1.4 MiB
Image 36% · 1.0 MiB
Document 5% · 160.1 KiB
Font 5% · 157.3 KiB
CSS 5% · 143.3 KiB
Other 1% · 33.0 KiB

~240.2 KiB of savings available

Remove unused JavaScript: 240.2 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.nobelprize.org/images/am-laureates-wit... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 1.0 MB
0 oversized -0 KB
9 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
671ms total JS execution
REVIEW
671ms total JS execution
Info::
https://www.nobelprize.org/: 209ms CPU time
Info::
Unattributable: 106ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-MY66...: 104ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WDH...: 97ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202408.1...: 92ms CPU time
Warning::
Third-party scripts: 671ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Other 19% Style & Layout 12% Script Parsing & Compilation 9% Parse HTML & CSS 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.nobelprize.org/209ms47ms7ms3rd
Unattributable106ms15ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MY66JBWQGX&cx=c&gtm=4e64h1104ms86ms16ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WDHZ8W597ms81ms15ms3rd
https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js92ms57ms16ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js62ms52ms8ms3rd
C
JS Bundles
Action
32 scripts, 240 KB unused
REVIEW
32 scripts, 240 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WDH...: 62 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MY66...: 61 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202408.1...: 60 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nobelprize.org/wp-includes/js/jquery/j...: 21 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 240 KB
240 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-WDHZ8W5136 KB62 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MY66JBWQGX&cx=c&gtm=4e64h1156 KB61 KB (39%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js111 KB60 KB (54%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://www.nobelprize.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.130 KB21 KB (69%)✓3rd
https://cdn.cookielaw.org/consent/d75760b8-7732-445e-9a87-2de3e237d0fe/OtAutoBlock.js3 KB—✓3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js30 KB—✓3rd
https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/objectfit/ls.object-fit.min.js?ver=17755544471 KB—✓3rd
https://www.nobelprize.org/wp-content/plugins/nobelprize/assets/js/admin/lib/flickity/flickity.pkgd.js?ver=177555444727 KB—✗3rd
https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/clamp/clamp.min.js?ver=17755544471 KB—✓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

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
6 fonts (157 KB)
PASS
6 fonts (157 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

157 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 837 ms LCP 1.6 shttps://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSerifText-Regular.woff2AlfredSerifText-Regular... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSerifText-Regular.woff2 — 36.6 KiB — 17 ms — font-display: swaphttps://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSans-Regular.woff2AlfredSans-Regular.woff2 https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSans-Regular.woff2 — 24.1 KiB — 18 ms — font-display: swaphttps://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSans-Italic.woff2AlfredSans-Italic.woff2 https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSans-Italic.woff2 — 24.5 KiB — 15 ms — font-display: swaphttps://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSerifText-Bold.woff2AlfredSerifText-Bold.woff2 https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSerifText-Bold.woff2 — 38.3 KiB — 27 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 83 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 42 ms — font-display: swap
AlfredSerifText-Regular... woff2 swap
Size 37 KB
Load time 17 ms
Start 154 ms
Risk FOUT — text flashes from fallback to web font
AlfredSans-Regular.woff2 woff2 swap
Size 24 KB
Load time 18 ms
Start 154 ms
Risk FOUT — text flashes from fallback to web font
AlfredSans-Italic.woff2 woff2 swap
Size 24 KB
Load time 15 ms
Start 211 ms
Risk FOUT — text flashes from fallback to web font
AlfredSerifText-Bold.woff2 woff2 swap
Size 38 KB
Load time 27 ms
Start 503 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 83 ms
Start 558 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 42 ms
Start 606 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)
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
91 requests over 4424ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 837 ms LCP 1.6 shttps://nobelprize.org// https://nobelprize.org/ — 301 — 176 B — 20 ms — h3https://www.nobelprize.org/www.nobelprize.org/ https://www.nobelprize.org/ — 200 — 48.9 KiB — 33 ms — h3https://www.nobelprize.org/wp-content/plugins/nobelprize-block-library/dist/css/frontend-style.css?ver=479338bdb1657cc05d08www.nobelprize.org/wp-content/plugi... https://www.nobelprize.org/wp-content/plugins/nobelprize-block-library/dist/css/frontend-style.css?ver=479338bdb1657cc05d08 — 200 — 696 B — 13 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/dist/css/frontend.css?ver=1775560393www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/dist/css/frontend.css?ver=1775560393 — 200 — 35.0 KiB — 23 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/loadjs.js?ver=1775554447www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/loadjs.js?ver=1775554447 — 200 — 488 B — 21 ms — h3https://cdn.cookielaw.org/consent/d75760b8-7732-445e-9a87-2de3e237d0fe/OtAutoBlock.jscdn.cookielaw.org/consent/d75760b8-... https://cdn.cookielaw.org/consent/d75760b8-7732-445e-9a87-2de3e237d0fe/OtAutoBlock.js — 200 — 3.0 KiB — 52 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 45 ms — h2https://www.nobelprize.org/wp-content/themes/nobelprize/assets/images/spinner.gifwww.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/images/spinner.gif — 200 — 31.7 KiB — 20 ms — h3https://www.nobelprize.org/wp-content/plugins/nobelprize-block-library/dist/js/frontend.js?ver=31920f0e291e7d415663www.nobelprize.org/wp-content/plugi... https://www.nobelprize.org/wp-content/plugins/nobelprize-block-library/dist/js/frontend.js?ver=31920f0e291e7d415663 — 200 — 1.4 KiB — 19 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/dist/js/frontend.js?ver=1775560393www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/dist/js/frontend.js?ver=1775560393 — 200 — 10.0 KiB — 13 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/bgset/ls.bgset.min.js?ver=1775554447www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/bgset/ls.bgset.min.js?ver=1775554447 — 200 — 1.4 KiB — 11 ms — h3https://cdn.cookielaw.org/consent/d75760b8-7732-445e-9a87-2de3e237d0fe/d75760b8-7732-445e-9a87-2de3e237d0fe.jsoncdn.cookielaw.org/consent/d75760b8-... https://cdn.cookielaw.org/consent/d75760b8-7732-445e-9a87-2de3e237d0fe/d75760b8-7732-445e-9a87-2de3e237d0fe.json — 200 — 2.3 KiB — 26 ms — h2https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/lazysizes/lazysizes.min.js?ver=1775554447www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/lazysizes/lazysizes.min.js?ver=1775554447 — 200 — 3.4 KiB — 15 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/objectfit/ls.object-fit.min.js?ver=1775554447www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/objectfit/ls.object-fit.min.js?ver=1775554447 — 200 — 1.3 KiB — 28 ms — h3https://www.nobelprize.org/wp-content/plugins/nobelprize/assets/js/admin/lib/flickity/flickity.pkgd.js?ver=1775554447www.nobelprize.org/wp-content/plugi... https://www.nobelprize.org/wp-content/plugins/nobelprize/assets/js/admin/lib/flickity/flickity.pkgd.js?ver=1775554447 — 200 — 27.1 KiB — 28 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/clamp/clamp.min.js?ver=1775554447www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/js/frontend/lib/clamp/clamp.min.js?ver=1775554447 — 200 — 1.5 KiB — 28 ms — h3https://www.nobelprize.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1www.nobelprize.org/wp-includes/js/j... https://www.nobelprize.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 30.2 KiB — 35 ms — h3https://www.nobelprize.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1www.nobelprize.org/wp-includes/js/j... https://www.nobelprize.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.1 KiB — 32 ms — h3https://stats.wp.com/e-202617.jsstats.wp.com/e-202617.js https://stats.wp.com/e-202617.js — 200 — 1.7 KiB — 8 ms — h2https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSerifText-Regular.woff2www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSerifText-Regular.woff2 — 200 — 36.6 KiB — 17 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSans-Regular.woff2www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSans-Regular.woff2 — 200 — 24.1 KiB — 18 ms — h3data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw== — 200 — 0 B — 0 ms — datahttps://www.youtube.com/embed/pUIp0zNG7Ro?feature=oembedwww.youtube.com/embed/pUIp0zNG7Ro?f... https://www.youtube.com/embed/pUIp0zNG7Ro?feature=oembed — 200 — 53.8 KiB — 381 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 307 B — 47 ms — h2https://www.youtube.com/embed/Ihq2nIne9-Q?feature=oembedwww.youtube.com/embed/Ihq2nIne9-Q?f... https://www.youtube.com/embed/Ihq2nIne9-Q?feature=oembed — 200 — 57.4 KiB — 339 ms — h2https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSans-Italic.woff2www.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/assets/fonts/alfred/AlfredSans-Italic.woff2 — 200 — 24.5 KiB — 15 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/dist/js/736.902b2b0b76c2b6a74896.chunk.jswww.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/dist/js/736.902b2b0b76c2b6a74896.chunk.js — 200 — 554 B — 20 ms — h3https://www.nobelprize.org/wp-content/themes/nobelprize/dist/js/535.9356935a511d8ee74592.chunk.jswww.nobelprize.org/wp-content/theme... https://www.nobelprize.org/wp-content/themes/nobelprize/dist/js/535.9356935a511d8ee74592.chunk.js — 200 — 13.0 KiB — 19 ms — 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h3https://www.google.com.br/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-MY66JBWQGX&cid=1166444083.1776800165&gtm=45je64h1v888191343z877968589za20gzb77968589zd77968589&rcb=2&aip=1&dma=0&gcs=G111&gcd=13v3v3v3v5l1&npa=0&frm=0&tag_exp=0~115616985~115938465~115938468~117266401~117512542&z=316954432www.google.com.br/ads/ga-audiences?... https://www.google.com.br/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-MY66JBWQGX&cid=1166444083.1776800165&gtm=45je64h1v888191343z877968589za20gzb77968589zd77968589&rcb=2&aip=1&dma=0&gcs=G111&gcd=13v3v3v3v5l1&npa=0&frm=0&tag_exp=0~115616985~115938465~115938468~117266401~117512542&z=316954432 — 200 — 63 B — 119 ms — h3https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 185 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 495 B — 66 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb — 200 — 146.3 KiB — 15 ms — h3https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 169 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 0 B — 57 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb — 200 — 0 B — 10 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 57 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 113 ms — h3https://i.ytimg.com/vi_webp/Ihq2nIne9-Q/sddefault.webpi.ytimg.com/vi_webp/Ihq2nIne9-Q/sdd... https://i.ytimg.com/vi_webp/Ihq2nIne9-Q/sddefault.webp — 200 — 21.1 KiB — 65 ms — h2https://i.ytimg.com/vi/pUIp0zNG7Ro/sddefault.jpgi.ytimg.com/vi/pUIp0zNG7Ro/sddefaul... https://i.ytimg.com/vi/pUIp0zNG7Ro/sddefault.jpg — 200 — 66.7 KiB — 7 ms — 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https://www.nobelprize.org/images/188514-hero-desktop.jpg — 200 — 26.8 KiB — 20 ms — h3https://www.google.com/js/th/rOmrN60AN-U9GRTHX8orPjMEIJ8wTXyJ5HZew_AwfbI.jswww.google.com/js/th/rOmrN60AN-U9GR... https://www.google.com/js/th/rOmrN60AN-U9GRTHX8orPjMEIJ8wTXyJ5HZew_AwfbI.js — 200 — 23.1 KiB — 72 ms — h3https://www.google.com/js/th/rOmrN60AN-U9GRTHX8orPjMEIJ8wTXyJ5HZew_AwfbI.jswww.google.com/js/th/rOmrN60AN-U9GR... https://www.google.com/js/th/rOmrN60AN-U9GRTHX8orPjMEIJ8wTXyJ5HZew_AwfbI.js — 200 — 0 B — 54 ms — h3https://bam.eu01.nr-data.net/1/NRJS-0940f7eaf4cb46e1cfe?a=211664124&v=1.313.1&to=MhBSZQoZXUZZB0UMCwtacVIMEVxbFxdYCwMJEB1BGR9W&rst=1819&ck=0&s=1b6e9d7582b6e879&ref=https://www.nobelprize.org/&ptid=7ca3d60be4cd7df5&af=err,spa,xhr,stn,ins&ap=326&be=52&fe=1633&dc=287&at=HldRE0IDTkg%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776800163446,%22n%22:0,%22f%22:22,%22dn%22:22,%22dne%22:22,%22c%22:22,%22s%22:22,%22ce%22:22,%22rq%22:31,%22rp%22:52,%22rpe%22:56,%22di%22:331,%22ds%22:333,%22de%22:339,%22dc%22:1681,%22l%22:1681,%22le%22:1685%7D,%22navigation%22:%7B%7D%7D&fp=192&fcp=192bam.eu01.nr-data.net/1/NRJS-0940f7e... https://bam.eu01.nr-data.net/1/NRJS-0940f7eaf4cb46e1cfe?a=211664124&v=1.313.1&to=MhBSZQoZXUZZB0UMCwtacVIMEVxbFxdYCwMJEB1BGR9W&rst=1819&ck=0&s=1b6e9d7582b6e879&ref=https://www.nobelprize.org/&ptid=7ca3d60be4cd7df5&af=err,spa,xhr,stn,ins&ap=326&be=52&fe=1633&dc=287&at=HldRE0IDTkg%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776800163446,%22n%22:0,%22f%22:22,%22dn%22:22,%22dne%22:22,%22c%22:22,%22s%22:22,%22ce%22:22,%22rq%22:31,%22rp%22:52,%22rpe%22:56,%22di%22:331,%22ds%22:333,%22de%22:339,%22dc%22:1681,%22l%22:1681,%22le%22:1685%7D,%22navigation%22:%7B%7D%7D&fp=192&fcp=192 — 200 — 733 B — 810 ms — http/1.1https://www.youtube.com/generate_204?oKcDQgwww.youtube.com/generate_204?oKcDQg https://www.youtube.com/generate_204?oKcDQg — 204 — 10 B — 5 ms — h3https://www.youtube.com/generate_204?MKiAMQwww.youtube.com/generate_204?MKiAMQ https://www.youtube.com/generate_204?MKiAMQ — 204 — 10 B — 5 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 117 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 99 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 65 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 189 B — 67 ms — h2https://bam.eu01.nr-data.net/events/1/NRJS-0940f7eaf4cb46e1cfe?a=211664124&v=1.313.1&to=MhBSZQoZXUZZB0UMCwtacVIMEVxbFxdYCwMJEB1BGR9W&rst=2642&ck=0&s=1b6e9d7582b6e879&ref=https://www.nobelprize.org/&ptid=7ca3d60be4cd7df5bam.eu01.nr-data.net/events/1/NRJS-... https://bam.eu01.nr-data.net/events/1/NRJS-0940f7eaf4cb46e1cfe?a=211664124&v=1.313.1&to=MhBSZQoZXUZZB0UMCwtacVIMEVxbFxdYCwMJEB1BGR9W&rst=2642&ck=0&s=1b6e9d7582b6e879&ref=https://www.nobelprize.org/&ptid=7ca3d60be4cd7df5 — 200 — 366 B — 228 ms — http/1.1https://bam.eu01.nr-data.net/jserrors/1/NRJS-0940f7eaf4cb46e1cfe?a=211664124&v=1.313.1&to=MhBSZQoZXUZZB0UMCwtacVIMEVxbFxdYCwMJEB1BGR9W&rst=2644&ck=0&s=1b6e9d7582b6e879&ref=https://www.nobelprize.org/&ptid=7ca3d60be4cd7df5bam.eu01.nr-data.net/jserrors/1/NRJ... https://bam.eu01.nr-data.net/jserrors/1/NRJS-0940f7eaf4cb46e1cfe?a=211664124&v=1.313.1&to=MhBSZQoZXUZZB0UMCwtacVIMEVxbFxdYCwMJEB1BGR9W&rst=2644&ck=0&s=1b6e9d7582b6e879&ref=https://www.nobelprize.org/&ptid=7ca3d60be4cd7df5 — 200 — 366 B — 222 ms — http/1.1https://bam.eu01.nr-data.net/events/1/NRJS-0940f7eaf4cb46e1cfe?a=211664124&v=1.313.1&to=MhBSZQoZXUZZB0UMCwtacVIMEVxbFxdYCwMJEB1BGR9W&rst=2647&ck=0&s=1b6e9d7582b6e879&ref=https://www.nobelprize.org/&ptid=7ca3d60be4cd7df5bam.eu01.nr-data.net/events/1/NRJS-... https://bam.eu01.nr-data.net/events/1/NRJS-0940f7eaf4cb46e1cfe?a=211664124&v=1.313.1&to=MhBSZQoZXUZZB0UMCwtacVIMEVxbFxdYCwMJEB1BGR9W&rst=2647&ck=0&s=1b6e9d7582b6e879&ref=https://www.nobelprize.org/&ptid=7ca3d60be4cd7df5 — 200 — 366 B — 319 ms — http/1.1https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 70 ms — h3https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 60 ms — h3
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 671ms · 509KB · $9/mo
www.nobelprize.org
Other
Costly
Execution 209ms
Transfer 49 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 106ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 104ms
Transfer 156 KB
Unused 39%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 97ms
Transfer 136 KB
Unused 45%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 92ms
Transfer 111 KB
Unused 54%
Monthly Cost $1/mo
Hotjar
Session Replay
Optional
Execution 62ms
Transfer 57 KB
Unused 67%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.nobelprize.org adds 209ms and costs ~$3/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.nobelprize.org takes 209ms 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

54% of OneTrust'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

67% of Hotjar'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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