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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
3

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

Mobile Desktop
86
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.46 s

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

1.50 s

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

47 ms

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

0.073

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

2.06 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.

2.86 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
16
6 PASS 4 REVIEW 3 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 100 requests
FIX
2.2 MB transferred, 100 requests
Info::
Page weighs 5.4 MB (2.2 MB transferred)
Warning::
JavaScript is 985 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 985 KB
Info::
Fonts are 481 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 481 KB
Info::
100 HTTP requests
Info::
Estimated 0.46 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
100 requests
0.46 g CO2 per page load
JavaScript 984.5 KiB 44%
Images 561.8 KiB 25%
Fonts 481.3 KiB 22%
CSS 85.0 KiB 4%
Other 65.4 KiB 3%
HTML 31.0 KiB 1%
Other 15.5 KiB 1%
Other 2.5 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
66% third-party, 0 ms blocking
FIX
66% third-party, 0 ms blocking
Warning::
Third-party code accounts for 66% of page weight (1.4 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
34%
66%
First-party Third-party
D
Page Weight Inventory
Action
100 resources · 2.2 MB · 214 KB savings available
FIX
100 resources · 2.2 MB · 214 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~214 KB of savings available
Warning::
67 third-party resources (66% of weight)
100 resources · 2.2 MiB · 67 third-party 1.2 MiB over 1MB target
JavaScript 46% · 1021.0 KiB
Image 26% · 577.9 KiB
Font 22% · 481.3 KiB
CSS 4% · 89.3 KiB
Document 1% · 31.0 KiB
Other 1% · 26.5 KiB

~214.4 KiB of savings available

Remove unused JavaScript: 214.4 KiB
C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://www.wwf.org.uk/themes/custom/wwf/img/wwf-l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wwf.org.uk/sites/default/files/wwf-log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.wwf.org.uk/themes/custom/wwf/img/FR_Fu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 562 KB
0 oversized -0 KB
19 legacy format
3 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

B
JS Execution Cost
951ms total JS execution
REVIEW
951ms total JS execution
Warning::
https://www.wwf.org.uk/: 284ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MBP...: 236ms CPU time
Info::
Unattributable: 171ms CPU time
Info::
https://try.abtasty.com/f994040e22ec159cbb7f07c33f...: 111ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 90ms CPU time
Warning::
Third-party scripts: 608ms (64% of total)

Main Thread Breakdown

Script Evaluation 42% Other 23% Style & Layout 20% Script Parsing & Compilation 7% Rendering 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.wwf.org.uk/284ms2ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-MBP22M236ms189ms22ms3rd
Unattributable171ms46ms0ms3rd
https://try.abtasty.com/f994040e22ec159cbb7f07c33f704fc0/main.baef0936fa8495327986.js111ms72ms10ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202404.1.0/otBannerSdk.js90ms50ms15ms3rd
https://www.wwf.org.uk/sites/default/files/js/js_MO8NeVflXPapiwcOgOwSh8acD9s7ClYvmJ-JYBD4-cc.js?scope=footer&delta=0&language=en&theme=wwf&include=eJx1UdFuwyAM_CEWPslyiEPdAmaYJM3fz2Fap1Xai43vLPmOQ1XqwOVOoUvzd51ukqliJOiHQJAEFRvGhvXmZuqdGtCzitICKycb1ePWBXSbM_f_ViIVapj-oxOXh8KmBHjHpwsPWtjkQCOtUpR3U4NzIv8OwMJaE55uxc-VKS3-5zFhCNIWluJi4njrszw9F5P4Gs22HSb_DrgoEtN1Ifpo5X2ehsg_YHY706F-1G9-PCFs2iXDKi1jH15nWmH4dcex-qFVp9Hst-vZLi2DiklmTB_aT1uPA3pFMZnNgey8kPxGBDtnkosBFEtGxpVLJGQslmrz1tLZOegXtZfI1g58ms42ms10ms1st
C
JS Bundles
Action
45 scripts, 214 KB unused
REVIEW
45 scripts, 214 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MBP...: 75 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 57 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.wwf.org.uk/sites/default/files/js/js_M...: 53 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://try.abtasty.com/f994040e22ec159cbb7f07c33f...: 29 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 214 KB
214 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-MBP22M193 KB75 KB (39%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202404.1.0/otBannerSdk.js109 KB57 KB (53%)✓3rd
https://www.wwf.org.uk/sites/default/files/js/js_MO8NeVflXPapiwcOgOwSh8acD9s7ClYvmJ-JYBD4-cc.js?scope=footer&delta=0&language=en&theme=wwf&include=eJx1UdFuwyAM_CEWPslyiEPdAmaYJM3fz2Fap1Xai43vLPmOQ1XqwOVOoUvzd51ukqliJOiHQJAEFRvGhvXmZuqdGtCzitICKycb1ePWBXSbM_f_ViIVapj-oxOXh8KmBHjHpwsPWtjkQCOtUpR3U4NzIv8OwMJaE55uxc-VKS3-5zFhCNIWluJi4njrszw9F5P4Gs22HSb_DrgoEtN1Ifpo5X2ehsg_YHY706F-1G9-PCFs2iXDKi1jH15nWmH4dcex-qFVp9Hst-vZLi2DiklmTB_aT1uPA3pFMZnNgey8kPxGBDtnkosBFEtGxpVLJGQslmrz1tLZOegXtZfI1g82 KB53 KB (65%)✓1st
https://try.abtasty.com/f994040e22ec159cbb7f07c33f704fc0/main.baef0936fa8495327986.js55 KB29 KB (53%)✓3rd
https://omny.fm/_next/static/chunks/14oz4l-8kljuv.js12 KB—✓3rd
https://omny.fm/_next/static/chunks/0zeu_34jdm7in.js15 KB—✓3rd
https://try.abtasty.com/shared/me.5386b5d034f35275c61d.js4 KB—✓3rd
https://www.wwf.org.uk/modules/contrib/google_tag/js/gtm.js?td6kyc2 KB—✓1st
https://cdnjs.cloudflare.com/ajax/libs/picturefill/3.0.2/picturefill.min.js5 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.js10 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

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
9 fonts (481 KB)
PASS
9 fonts (481 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

481 KB total

Render-blocking

0

of 9

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 1.5 s LCP 1.5 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 16 ms — font-display: swaphttps://www.wwf.org.uk/themes/custom/wwf/fonts/WWF-WEBFONT.woff2WWF-WEBFONT.woff2 https://www.wwf.org.uk/themes/custom/wwf/fonts/WWF-WEBFONT.woff2 — 45.1 KiB — 564 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 76.0 KiB — 20 ms — font-display: swaphttps://www.wwf.org.uk/themes/custom/wwf/fonts/fontello.woff2?10178545=fontello.woff2 https://www.wwf.org.uk/themes/custom/wwf/fonts/fontello.woff2?10178545= — 6.0 KiB — 554 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2 — 155.2 KiB — 27 ms — font-display: swaphttps://www.wwf.org.uk/themes/custom/wwf/fonts/tiktok.wofftiktok.woff https://www.wwf.org.uk/themes/custom/wwf/fonts/tiktok.woff — 3.6 KiB — 556 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-brands-400.woff2 — 116.6 KiB — 32 ms — font-display: swaphttps://omny.fm/_next/static/media/open-sans-latin-600-normal.0_eexel.ci.l..woff2open-sans-latin-600-nor... https://omny.fm/_next/static/media/open-sans-latin-600-normal.0_eexel.ci.l..woff2 — 18.4 KiB — 12 ms — font-display: swaphttps://omny.fm/_next/static/media/open-sans-latin-400-normal.0_lnrv79a2jvt.woff2open-sans-latin-400-nor... https://omny.fm/_next/static/media/open-sans-latin-400-normal.0_lnrv79a2jvt.woff2 — 18.4 KiB — 12 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 16 ms
Start 732 ms
Risk FOUT — text flashes from fallback to web font
WWF-WEBFONT.woff2 woff2 swap
Size 45 KB
Load time 564 ms
Start 740 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 unknown swap
Size 76 KB
Load time 20 ms
Start 741 ms
Risk FOUT — text flashes from fallback to web font
fontello.woff2 woff2 swap
Size 6 KB
Load time 554 ms
Start 741 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 27 ms
Start 741 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
tiktok.woff woff swap
Size 4 KB
Load time 556 ms
Start 742 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-brands-400.woff2 woff2 swap
Size 117 KB
Load time 32 ms
Start 742 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
open-sans-latin-600-nor... woff2 swap
Size 18 KB
Load time 12 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
open-sans-latin-400-nor... woff2 swap
Size 18 KB
Load time 12 ms
Start 1.1 s
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 ~160 KB and ~320 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
A+
HTTP Caching
max-age=31536000 (52 weeks)
PASS
max-age=31536000 (52 weeks)
Info::
Cache-Control header is set
Got: max-age=31536000, public
Info::
Effective TTL: 52 weeks (max-age=31536000)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=31536000, public

DirectiveValueMeaning
max-age31536000Cache for 52 weeks
public—Any cache may store this response
Effective TTL: 31536000 seconds
Network Waterfall
100 requests over 2155ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.5 s LCP 1.5 shttps://www.wwf.org.uk// https://www.wwf.org.uk/ — 200 — 17.6 KiB — 445 ms — h2https://www.wwf.org.uk/sites/default/files/css/css_2GctgVSq4u7_6JeYSba6vd5gazSrCnPZ0hKXNIrJnac.css?delta=0&language=en&theme=wwf&include=eJx1UlGWpCAMvJCLR8oLEJVpBIbEsd3Tb6Db3nlOz4dIqkJIqkBmEgjpg5zkOjpm4yhJxRiYgGPwVEGCROIBf-YueaWCs2aWGAQm_ASWI4Y0D5ZE9CzdS2byMIWoIY8zJdLqg7uRD1oGKnHJicMXgaCNNF4B8EGr4zG4qB0co0Wmc78Ss17PZ5yyVy5XGn3dCkaDH3h_ACnXVaf6S8Mcw7yIzffxtRsKVpwrloXPk_8Rs6WyWRVkIT_wwULro4mvQDuPfTVr9lt8QuA2lrzC1K6UPralCVSWG_-aMYXkIW8Cq3YLcw1-2PdJYYqeTf-By-WoreWf1FOkh1ednmO2GP-cfjRopbSZaUu-YmAFYSFUgzvXbDRTzvI9bv4-o6cahlZL_oKp7xdkoZrfQLAHWfoYFzIk6O_IYkqvBk6yCafqsbzB2fQXFdw7DmzM7vaWKVUNc8IXUuh-vaUZ1qGH0a3N-i1-0TvZZqehSKqzsGHduV4NMPOo3z8dM1ii/sites/default/files/css/css_2GctgV... https://www.wwf.org.uk/sites/default/files/css/css_2GctgVSq4u7_6JeYSba6vd5gazSrCnPZ0hKXNIrJnac.css?delta=0&language=en&theme=wwf&include=eJx1UlGWpCAMvJCLR8oLEJVpBIbEsd3Tb6Db3nlOz4dIqkJIqkBmEgjpg5zkOjpm4yhJxRiYgGPwVEGCROIBf-YueaWCs2aWGAQm_ASWI4Y0D5ZE9CzdS2byMIWoIY8zJdLqg7uRD1oGKnHJicMXgaCNNF4B8EGr4zG4qB0co0Wmc78Ss17PZ5yyVy5XGn3dCkaDH3h_ACnXVaf6S8Mcw7yIzffxtRsKVpwrloXPk_8Rs6WyWRVkIT_wwULro4mvQDuPfTVr9lt8QuA2lrzC1K6UPralCVSWG_-aMYXkIW8Cq3YLcw1-2PdJYYqeTf-By-WoreWf1FOkh1ednmO2GP-cfjRopbSZaUu-YmAFYSFUgzvXbDRTzvI9bv4-o6cahlZL_oKp7xdkoZrfQLAHWfoYFzIk6O_IYkqvBk6yCafqsbzB2fQXFdw7DmzM7vaWKVUNc8IXUuh-vaUZ1qGH0a3N-i1-0TvZZqehSKqzsGHduV4NMPOo3z8dM1ii — 200 — 10.6 KiB — 135 ms — h2https://www.wwf.org.uk/sites/default/files/css/css_OIfy8SrhzPeqWcIVVXs0_23oAhskzHiDYxXaydLtn7I.css?delta=1&language=en&theme=wwf&include=eJx1UlGWpCAMvJCLR8oLEJVpBIbEsd3Tb6Db3nlOz4dIqkJIqkBmEgjpg5zkOjpm4yhJxRiYgGPwVEGCROIBf-YueaWCs2aWGAQm_ASWI4Y0D5ZE9CzdS2byMIWoIY8zJdLqg7uRD1oGKnHJicMXgaCNNF4B8EGr4zG4qB0co0Wmc78Ss17PZ5yyVy5XGn3dCkaDH3h_ACnXVaf6S8Mcw7yIzffxtRsKVpwrloXPk_8Rs6WyWRVkIT_wwULro4mvQDuPfTVr9lt8QuA2lrzC1K6UPralCVSWG_-aMYXkIW8Cq3YLcw1-2PdJYYqeTf-By-WoreWf1FOkh1ednmO2GP-cfjRopbSZaUu-YmAFYSFUgzvXbDRTzvI9bv4-o6cahlZL_oKp7xdkoZrfQLAHWfoYFzIk6O_IYkqvBk6yCafqsbzB2fQXFdw7DmzM7vaWKVUNc8IXUuh-vaUZ1qGH0a3N-i1-0TvZZqehSKqzsGHduV4NMPOo3z8dM1ii/sites/default/files/css/css_OIfy8S... https://www.wwf.org.uk/sites/default/files/css/css_OIfy8SrhzPeqWcIVVXs0_23oAhskzHiDYxXaydLtn7I.css?delta=1&language=en&theme=wwf&include=eJx1UlGWpCAMvJCLR8oLEJVpBIbEsd3Tb6Db3nlOz4dIqkJIqkBmEgjpg5zkOjpm4yhJxRiYgGPwVEGCROIBf-YueaWCs2aWGAQm_ASWI4Y0D5ZE9CzdS2byMIWoIY8zJdLqg7uRD1oGKnHJicMXgaCNNF4B8EGr4zG4qB0co0Wmc78Ss17PZ5yyVy5XGn3dCkaDH3h_ACnXVaf6S8Mcw7yIzffxtRsKVpwrloXPk_8Rs6WyWRVkIT_wwULro4mvQDuPfTVr9lt8QuA2lrzC1K6UPralCVSWG_-aMYXkIW8Cq3YLcw1-2PdJYYqeTf-By-WoreWf1FOkh1ednmO2GP-cfjRopbSZaUu-YmAFYSFUgzvXbDRTzvI9bv4-o6cahlZL_oKp7xdkoZrfQLAHWfoYFzIk6O_IYkqvBk6yCafqsbzB2fQXFdw7DmzM7vaWKVUNc8IXUuh-vaUZ1qGH0a3N-i1-0TvZZqehSKqzsGHduV4NMPOo3z8dM1ii — 200 — 1.5 KiB — 143 ms — h2https://fonts.googleapis.com/css?family=Open+Sans:400,400italic,600,600italic,700,700italic,300fonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans:400,400italic,600,600italic,700,700italic,300 — 200 — 2.6 KiB — 132 ms — h2https://cdnjs.cloudflare.com/ajax/libs/normalize/3.0.3/normalize.min.csscdnjs.cloudflare.com/ajax/libs/norm... https://cdnjs.cloudflare.com/ajax/libs/normalize/3.0.3/normalize.min.css — 200 — 1.3 KiB — 19 ms — h3https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.csscdnjs.cloudflare.com/ajax/libs/slic... https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.8.1/slick.min.css — 200 — 1023 B — 22 ms — h3https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.css — 200 — 18.4 KiB — 24 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
64% of JavaScript execution is third-party
First-party Third-party 608ms · 357KB · £6/mo
Google Tag Manager
Tag Manager
Costly
Execution 236ms
Transfer 193 KB
Unused 39%
Monthly Cost £2/mo
Unattributable
Other
Optional
Execution 171ms
Transfer 0 KB
Monthly Cost £2/mo
try.abtasty.com
Other
Optional
Execution 111ms
Transfer 55 KB
Unused 53%
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 90ms
Transfer 109 KB
Unused 53%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 236ms and costs ~£2/month

64% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Google Tag Manager takes 236ms 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

53% of try.abtasty.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

53% of cdn-ukwest.onetrust.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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-03-16 — 2026-04-12)

LCP (p75)

1424 ms

92% good

INP (p75)

102 ms

91% good

CLS (p75)

0.060

96% good

FCP (p75)

1293 ms

TTFB (p75)

671 ms

This origin passes Core Web Vitals assessment
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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