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https://guinnessworldrecords.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.

788 ms

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

2.49 s

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

14 ms

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

0.001

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

1.61 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.

3.84 s

Page Load Progression

427 ms
853 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.5 MB transferred, 109 requests
FIX
4.5 MB transferred, 109 requests
Critical::
Page weighs 8.1 MB (4.5 MB transferred)
Warning::
Images are 3.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.3 MB
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Warning::
109 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.95 g CO2 per page load
4.5 MB / 2.4 MB budget
4.5 MB transferred
109 requests
0.95 g CO2 per page load
Images 3.3 MiB 72%
JavaScript 1.0 MiB 22%
Other 114.8 KiB 2%
Fonts 84.2 KiB 2%
CSS 28.5 KiB 1%
Other 18.2 KiB 0%
HTML 7.6 KiB 0%
Other 5.3 KiB 0%
Other 2.4 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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 (4.5 MiB of 4.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
40 scripts, 339 KB unused
FIX
40 scripts, 339 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WW6...: 66 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QBVK...: 60 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ezojs.com/identity.js: 58 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://go.ezodn.com/porpoiseant/ezadloadrewarded....: 41 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 35 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 339 KB
339 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-WW669H148 KB66 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-QBVKPTNFD0&cx=c&_slc=1168 KB60 KB (35%)✓3rd
https://www.ezojs.com/identity.js102 KB58 KB (57%)✓3rd
https://go.ezodn.com/porpoiseant/ezadloadrewarded.js?cb=1048&gcb=195-4263 KB41 KB (66%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB35 KB (36%)✓3rd
https://www.ezojs.com/ezoic/sa.min.js66 KB33 KB (51%)✓3rd
https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.js60 KB27 KB (45%)✓3rd
https://www.guinnessworldrecords.com/js/scripts.min.js33 KB20 KB (61%)✓3rd
https://the.gatekeeperconsent.com/cmp.min.js3 KB—✓3rd
https://g.ezoic.net/sa.go10 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

D
Page Weight Inventory
Action
109 resources · 4.5 MB · 339 KB savings available
FIX
109 resources · 4.5 MB · 339 KB savings available
Warning::
Page weight 3.5 MB over 1MB target
Got: 4.5 MB Expected: ≤ 1 MB
Info::
~339 KB of savings available
Warning::
108 third-party resources (100% of weight)
Info::
3 resources over 200KB
109 resources · 4.5 MiB · 108 third-party 3.5 MiB over 1MB target
Image 72% · 3.3 MiB
JavaScript 23% · 1.0 MiB
Other 3% · 120.5 KiB
Font 2% · 84.2 KiB
CSS 1% · 28.5 KiB
Document 0% · 13.5 KiB

~339.4 KiB of savings available

Remove unused JavaScript: 339.4 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
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Warning::
https://www.guinnessworldrecords.com/products/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/images/marath... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/images/og_ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/images/london... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/products/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/images/guinne... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/images/dr-how... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/images/employ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/products/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/images/logo.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/images/gwr-st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.guinnessworldrecords.com/products/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33 images 3.2 MB
0 oversized -0 KB
29 legacy format
12 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

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

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

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

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

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
731ms total JS execution
REVIEW
731ms total JS execution
Info::
Unattributable: 142ms CPU time
Info::
https://www.guinnessworldrecords.com/: 121ms CPU time
Info::
https://sdks.shopifycdn.com/buy-button/latest/buy-...: 120ms CPU time
Info::
https://www.ezojs.com/detroitchicago/columbus.js: 104ms CPU time
Info::
https://the.gatekeeperconsent.com/v2/cmp.js?v=466: 84ms CPU time
Warning::
Third-party scripts: 731ms (100% of total)

Main Thread Breakdown

Script Evaluation 59% Other 17% Style & Layout 11% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
Unattributable142ms3ms0ms3rd
https://www.guinnessworldrecords.com/121ms13ms0ms3rd
https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.js120ms96ms9ms3rd
https://www.ezojs.com/detroitchicago/columbus.js104ms77ms1ms3rd
https://the.gatekeeperconsent.com/v2/cmp.js?v=46684ms68ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WW669H55ms46ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QBVKPTNFD0&cx=c&_slc=154ms43ms11ms3rd
https://www.guinnessworldrecords.com/js/scripts.min.js50ms31ms3ms3rd
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
3 fonts (84 KB)
PASS
3 fonts (84 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

84 KB total

Render-blocking

0

of 3

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 2.0 s 2.5 s FCP 788 ms LCP 2.5 shttps://www.guinnessworldrecords.com/css/fonts/rubik/rubik-regular-webfont.woff2rubik-regular-webfont.w... https://www.guinnessworldrecords.com/css/fonts/rubik/rubik-regular-webfont.woff2 — 27.3 KiB — 44 ms — font-display: swaphttps://www.guinnessworldrecords.com/css/fonts/gwr.ttfgwr.ttf https://www.guinnessworldrecords.com/css/fonts/gwr.ttf — 29.4 KiB — 47 ms — font-display: swaphttps://www.guinnessworldrecords.com/css/fonts/rubik/rubik-medium-webfont.woff2rubik-medium-webfont.woff2 https://www.guinnessworldrecords.com/css/fonts/rubik/rubik-medium-webfont.woff2 — 27.5 KiB — 112 ms — font-display: swap
rubik-regular-webfont.w... woff2 swap
Size 27 KB
Load time 44 ms
Start 222 ms
Risk FOUT — text flashes from fallback to web font
gwr.ttf ttf swap
Size 29 KB
Load time 47 ms
Start 223 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
rubik-medium-webfont.woff2 woff2 swap
Size 28 KB
Load time 112 ms
Start 224 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 ~9 KB and ~18 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
109 requests over 2774ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 788 ms LCP 2.5 shttps://guinnessworldrecords.com// https://guinnessworldrecords.com/ — 301 — 294 B — 8 ms — h2http://www.guinnessworldrecords.com/www.guinnessworldrecords.com/ http://www.guinnessworldrecords.com/ — 307 — 0 B — 1 ms — http/1.1https://www.guinnessworldrecords.com/www.guinnessworldrecords.com/ https://www.guinnessworldrecords.com/ — 200 — 7.6 KiB — 51 ms — h2https://www.guinnessworldrecords.com/css/main.min.csswww.guinnessworldrecords.com/css/ma... https://www.guinnessworldrecords.com/css/main.min.css — 200 — 28.5 KiB — 101 ms — h2https://www.guinnessworldrecords.com/images/og_image.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/og_image.jpg — 200 — 18.6 KiB — 45 ms — h2https://www.guinnessworldrecords.com/images/css/gwr_kids_link.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/css/gwr_kids_link.jpg — 200 — 16.4 KiB — 46 ms — h2https://www.guinnessworldrecords.com/images/logo.pngwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/logo.png — 200 — 56.6 KiB — 141 ms — h2https://www.guinnessworldrecords.com/images/dr-howard-carousel.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/dr-howard-carousel.jpg — 200 — 147.0 KiB — 68 ms — h2https://www.guinnessworldrecords.com/images/london-venue-homepage-banner.pngwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/london-venue-homepage-banner.png — 200 — 578.1 KiB — 122 ms — h2https://www.guinnessworldrecords.com/js/jquery.jswww.guinnessworldrecords.com/js/jqu... https://www.guinnessworldrecords.com/js/jquery.js — 200 — 30.0 KiB — 54 ms — h2https://www.guinnessworldrecords.com/js/scripts.min.jswww.guinnessworldrecords.com/js/scr... https://www.guinnessworldrecords.com/js/scripts.min.js — 200 — 33.4 KiB — 71 ms — h2https://www.guinnessworldrecords.com/scripts.jswww.guinnessworldrecords.com/script... https://www.guinnessworldrecords.com/scripts.js — 200 — 2.2 KiB — 142 ms — h2https://www.guinnessworldrecords.com/products/images/banner-with-gwr2026-homepage-1900x650.jpgwww.guinnessworldrecords.com/produc... https://www.guinnessworldrecords.com/products/images/banner-with-gwr2026-homepage-1900x650.jpg — 200 — 189.0 KiB — 127 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/stelarc-ear-on-arm-header-image.jpgwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/stelarc-ear-on-arm-header-image.jpg — 200 — 123.7 KiB — 148 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/love-locks-thumbnail.pngwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/love-locks-thumbnail.png — 200 — 200.8 KiB — 104 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/oldest-rabbit-new-thumbnail.jpgwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/oldest-rabbit-new-thumbnail.jpg — 200 — 192.7 KiB — 64 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/strongest-bodypart-thumbnail.pngwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/strongest-bodypart-thumbnail.png — 200 — 133.7 KiB — 138 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/most-marvel-tattoos-thumbnail.jpgwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/most-marvel-tattoos-thumbnail.jpg — 200 — 184.8 KiB — 131 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/stilts-24hr-thumbnail.jpgwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/stilts-24hr-thumbnail.jpg — 200 — 141.4 KiB — 156 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/phm-lego-header-image.jpgwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/phm-lego-header-image.jpg — 200 — 120.5 KiB — 133 ms — h2https://www.guinnessworldrecords.com/images/css/loading.gifwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/css/loading.gif — 200 — 30.8 KiB — 129 ms — h2https://www.guinnessworldrecords.com/products/images/largest-loop-the-loop-in-a-car-for-tile.jpgwww.guinnessworldrecords.com/produc... https://www.guinnessworldrecords.com/products/images/largest-loop-the-loop-in-a-car-for-tile.jpg — 200 — 196.3 KiB — 159 ms — h2https://www.guinnessworldrecords.com/images/employee-engagement-home.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/employee-engagement-home.jpg — 200 — 62.0 KiB — 135 ms — h2https://www.guinnessworldrecords.com/images/gwr-studios.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/gwr-studios.jpg — 200 — 95.5 KiB — 155 ms — h2https://www.guinnessworldrecords.com/products/images/view-our-case-studies-with-certificate-and-team.jpgwww.guinnessworldrecords.com/produc... https://www.guinnessworldrecords.com/products/images/view-our-case-studies-with-certificate-and-team.jpg — 200 — 88.2 KiB — 149 ms — h2https://www.guinnessworldrecords.com/images/guinness-world-records-kids-logo-on-purple-background-home.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/guinness-world-records-kids-logo-on-purple-background-home.jpg — 200 — 71.9 KiB — 67 ms — h2https://www.guinnessworldrecords.com/images/marathon-runner-group-home.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/marathon-runner-group-home.jpg — 200 — 91.7 KiB — 114 ms — h2https://www.guinnessworldrecords.com/products/images/tile-for-record-selector-homepage.jpgwww.guinnessworldrecords.com/produc... https://www.guinnessworldrecords.com/products/images/tile-for-record-selector-homepage.jpg — 200 — 186.8 KiB — 153 ms — h2https://www.guinnessworldrecords.com/images/footer-strapline.pngwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/footer-strapline.png — 200 — 4.7 KiB — 146 ms — h2https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.jssdks.shopifycdn.com/buy-button/late... https://sdks.shopifycdn.com/buy-button/latest/buy-button-storefront.min.js — 200 — 60.3 KiB — 81 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 788 ms LCP 2.5 shttps://guinnessworldrecords.com// https://guinnessworldrecords.com/ — 301 — 294 B — 8 ms — h2http://www.guinnessworldrecords.com/www.guinnessworldrecords.com/ http://www.guinnessworldrecords.com/ — 307 — 0 B — 1 ms — http/1.1https://www.guinnessworldrecords.com/www.guinnessworldrecords.com/ https://www.guinnessworldrecords.com/ — 200 — 7.6 KiB — 51 ms — h2https://www.guinnessworldrecords.com/css/main.min.csswww.guinnessworldrecords.com/css/ma... https://www.guinnessworldrecords.com/css/main.min.css — 200 — 28.5 KiB — 101 ms — h2https://www.guinnessworldrecords.com/images/og_image.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/og_image.jpg — 200 — 18.6 KiB — 45 ms — h2https://www.guinnessworldrecords.com/images/css/gwr_kids_link.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/css/gwr_kids_link.jpg — 200 — 16.4 KiB — 46 ms — h2https://www.guinnessworldrecords.com/images/logo.pngwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/logo.png — 200 — 56.6 KiB — 141 ms — h2https://www.guinnessworldrecords.com/images/dr-howard-carousel.jpgwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/dr-howard-carousel.jpg — 200 — 147.0 KiB — 68 ms — h2https://www.guinnessworldrecords.com/images/london-venue-homepage-banner.pngwww.guinnessworldrecords.com/images... https://www.guinnessworldrecords.com/images/london-venue-homepage-banner.png — 200 — 578.1 KiB — 122 ms — h2https://www.guinnessworldrecords.com/js/jquery.jswww.guinnessworldrecords.com/js/jqu... https://www.guinnessworldrecords.com/js/jquery.js — 200 — 30.0 KiB — 54 ms — h2https://www.guinnessworldrecords.com/js/scripts.min.jswww.guinnessworldrecords.com/js/scr... https://www.guinnessworldrecords.com/js/scripts.min.js — 200 — 33.4 KiB — 71 ms — h2https://www.guinnessworldrecords.com/scripts.jswww.guinnessworldrecords.com/script... https://www.guinnessworldrecords.com/scripts.js — 200 — 2.2 KiB — 142 ms — h2https://www.guinnessworldrecords.com/products/images/banner-with-gwr2026-homepage-1900x650.jpgwww.guinnessworldrecords.com/produc... https://www.guinnessworldrecords.com/products/images/banner-with-gwr2026-homepage-1900x650.jpg — 200 — 189.0 KiB — 127 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/stelarc-ear-on-arm-header-image.jpgwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/stelarc-ear-on-arm-header-image.jpg — 200 — 123.7 KiB — 148 ms — h2https://www.guinnessworldrecords.com/news/2026/4/images/love-locks-thumbnail.pngwww.guinnessworldrecords.com/news/2... https://www.guinnessworldrecords.com/news/2026/4/images/love-locks-thumbnail.png — 200 — 200.8 KiB — 104 ms — 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https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=1034594633413716&ev=PageView&dl=https%3A%2F%2Fwww.guinnessworldrecords.com%2F&rl=&if=false&ts=1776804644773&sw=800&sh=600&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.1.1776804644766.374716743776199425&ler=empty&cdl=API_unavailable&pmd[title]=Home%20%7C%20Guinness%20World%20Records&pmd[locale]=en%0A&pmd[description]=The%20Guinness%20World%20Records%20official%20site%20with%20ultimate%20record-breaking%20facts%0A%26%20achievements.%20Do%20you%20want%20to%20set%20a%20world%20record%3F%20Are%20you%20Officially%20Amazing%3F&pmd[keywords]=Guinness%20World%20Records%2C%20record%2C%20book%2C%20news%2C%20kids%2C%20animals%2C%20annual%2C%20explore%2C%20set%2C%20gamer%27s&plt=331.29999923706055&it=1776804644717&coo=false&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct2&expv2[6]=hf1&rqm=FGET — 200 — 201 B — 246 ms — h3https://px.ads.linkedin.com/wa/?medium=fetch&fmt=gpx.ads.linkedin.com/wa/?medium=fetc... 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h3https://go.ezodn.com/detroitchicago/birmingham.js?gcb=195-42&cb=539c47377cgo.ezodn.com/detroitchicago/birming... https://go.ezodn.com/detroitchicago/birmingham.js?gcb=195-42&cb=539c47377c — 200 — 890 B — 34 ms — h3https://go.ezodn.com/ezoicanalytics.js?cb=1&dcb=195-42&shcb=34go.ezodn.com/ezoicanalytics.js?cb=1... https://go.ezodn.com/ezoicanalytics.js?cb=1&dcb=195-42&shcb=34 — 200 — 1.5 KiB — 29 ms — h3https://go.ezodn.com/porpoiseant/ezadloadrewarded.js?cb=1048&gcb=195-42go.ezodn.com/porpoiseant/ezadloadre... https://go.ezodn.com/porpoiseant/ezadloadrewarded.js?cb=1048&gcb=195-42 — 200 — 63.0 KiB — 36 ms — h3https://g.ezoic.net/ezais/analytics?cb=1g.ezoic.net/ezais/analytics?cb=1 https://g.ezoic.net/ezais/analytics?cb=1 — 200 — 4.8 KiB — 25 ms — h2https://g.ezoic.net/parsonsmaize/olathe.js?gcb=195-42&cb=30g.ezoic.net/parsonsmaize/olathe.js?... https://g.ezoic.net/parsonsmaize/olathe.js?gcb=195-42&cb=30 — 200 — 957 B — 23 ms — 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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 731ms · 459KB · €8/mo
Unattributable
Other
Optional
Execution 142ms
Transfer 0 KB
Monthly Cost €2/mo
www.guinnessworldrecords.com
Other
Optional
Execution 121ms
Transfer 8 KB
Monthly Cost €1/mo
sdks.shopifycdn.com
Other
Optional
Execution 120ms
Transfer 60 KB
Unused 45%
Monthly Cost €1/mo
www.ezojs.com
Other
Optional
Execution 104ms
Transfer 15 KB
Monthly Cost €1/mo
the.gatekeeperconsent.com
Other
Optional
Execution 84ms
Transfer 26 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 55ms
Transfer 148 KB
Unused 45%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 54ms
Transfer 168 KB
Unused 35%
Monthly Cost €1/mo
www.guinnessworldrecords.com
Other
Optional
Execution 50ms
Transfer 33 KB
Unused 61%
Monthly Cost €1/mo

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

61% of www.guinnessworldrecords.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

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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