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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.

1.08 s

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

1.65 s

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

0 ms

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

0.049

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

1.73 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.

1.65 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
5.3 MB transferred, 130 requests
FIX
5.3 MB transferred, 130 requests
Critical::
Page weighs 13.5 MB (5.3 MB transferred)
Warning::
JavaScript is 2.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.6 MB
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Info::
CSS is 273 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 273 KB
Info::
Fonts are 203 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 203 KB
Warning::
130 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.3 MB / 2.4 MB budget
5.3 MB transferred
130 requests
1.1 g CO2 per page load
JavaScript 2.6 MiB 49%
Images 2.0 MiB 37%
CSS 273.1 KiB 5%
Fonts 202.6 KiB 4%
HTML 124.4 KiB 2%
Other 89.3 KiB 2%
Other 42.4 KiB 1%
Other 10.6 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

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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

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 (5.3 MiB of 5.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
53 scripts, 611 KB unused
FIX
53 scripts, 611 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 242 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NHC...: 77 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-RWH1...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 63 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.cambridgeenglish.org/assets/js/vendor/...: 57 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 611 KB
611 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB242 KB (67%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NHCSV7174 KB77 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-RWH1WT5Q9J&cx=c&gtm=4e64k1h2171 KB68 KB (40%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202507.1.0/otBannerSdk.js120 KB63 KB (53%)✓3rd
https://www.cambridgeenglish.org/assets/js/vendor/jquery-ui/1.11.4/jquery-ui.min.js?v=0.163 KB57 KB (90%)✓3rd
https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D103 KB52 KB (51%)✓3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)✓3rd
https://www.cambridgeenglish.org/js/jwplayer.js25 KB21 KB (83%)✓3rd
https://www.cambridgeenglish.org/js/ucles.jquery.responsive-table.js1 KB—✓3rd
https://www.cambridgeenglish.org/js/ucles.jquery.ajax-loading.js1 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

F
Page Weight Inventory
Action
130 resources · 5.3 MB · 611 KB savings available
FIX
130 resources · 5.3 MB · 611 KB savings available
Warning::
Page weight 4.3 MB over 1MB target
Got: 5.3 MB Expected: ≤ 1 MB
Info::
~611 KB of savings available
Warning::
129 third-party resources (100% of weight)
Info::
7 resources over 200KB
130 resources · 5.3 MiB · 129 third-party 4.3 MiB over 1MB target
JavaScript 50% · 2.6 MiB
Image 39% · 2.1 MiB
CSS 5% · 277.6 KiB
Font 4% · 202.6 KiB
Document 2% · 124.4 KiB
Other 1% · 27.5 KiB

~611.1 KiB of savings available

Remove unused JavaScript: 611.1 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
39 images, 0 KB saveable
REVIEW
39 images, 0 KB saveable
Warning::
https://www.cambridgeenglish.org/Images/Monash-Uni... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/english-pr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/cambridge-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/P-and-G-lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/blue%20wav... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/digital-to... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/Accenture-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/Cambridge_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/english-lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/cambridge-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/Kings-Coll... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/alte-logo-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/ce-banner.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/trust_engl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/promise-to... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/McGill-log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/world-shap... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/courses-an... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/girl-takin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.cambridgeenglish.org/Images/bsi-logo-f... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
39 images 2.0 MB
0 oversized -0 KB
38 legacy format
20 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

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
707ms total JS execution
REVIEW
707ms total JS execution
Warning::
https://www.cambridgeenglish.org/: 252ms CPU time
Info::
Unattributable: 175ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-NHC...: 119ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 81ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-RWH1...: 80ms CPU time
Warning::
Third-party scripts: 707ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 21% Style & Layout 16% Script Parsing & Compilation 11% Rendering 6% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.cambridgeenglish.org/252ms6ms1ms3rd
Unattributable175ms25ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NHCSV7119ms90ms23ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202507.1.0/otBannerSdk.js81ms54ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-RWH1WT5Q9J&cx=c&gtm=4e64k1h280ms69ms11ms3rd
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
7 fonts (203 KB)
PASS
7 fonts (203 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

203 KB total

Render-blocking

0

of 7

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 1.1 s LCP 1.6 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 34 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 43 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2 — 14.6 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 113 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 39.2 KiB — 46 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2memtYaGs126MiZpBA-UFUIc... https://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2 — 44.0 KiB — 45 ms — font-display: swaphttps://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 — 56 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 34 ms
Start 343 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 43 ms
Start 344 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 52 ms
Start 345 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 113 ms
Start 522 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 39 KB
Load time 46 ms
Start 866 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 45 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 56 ms
Start 1.0 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)
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
130 requests over 4111ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.1 s LCP 1.6 shttps://cambridgeenglish.org// https://cambridgeenglish.org/ — 301 — 53 B — 98 ms — h2https://www.cambridgeenglish.org/www.cambridgeenglish.org/ https://www.cambridgeenglish.org/ — 200 — 12.1 KiB — 34 ms — h2https://cdn-ukwest.onetrust.com/consent/e481ef75-0b7a-49f5-91f3-f91f339f73a3/OtAutoBlock.jscdn-ukwest.onetrust.com/consent/e48... https://cdn-ukwest.onetrust.com/consent/e481ef75-0b7a-49f5-91f3-f91f339f73a3/OtAutoBlock.js — 200 — 7.0 KiB — 105 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.jscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 79 ms — h2https://www.cambridgeenglish.org/css/local-publication.css?v=2.5www.cambridgeenglish.org/css/local-... https://www.cambridgeenglish.org/css/local-publication.css?v=2.5 — 200 — 21.0 KiB — 39 ms — h2https://www.cambridgeenglish.org/css/local-business.css?v=2.8www.cambridgeenglish.org/css/local-... 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h2https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=Mve00f%2FTRW62JZu4yorYog%3D%3D&bg=!5-Sl5IbNAAa1ilLUlYo7AEcBe5WfOHGZ4W6vge_9-YfA8H-Gdxl51GFbb6M-JpAr8zxO0SVE8wGx9yhogE1x1GUrD4K_gnGriTHDD6qCXSjud6vq27ldcgIAAABNUgAAAARoAQd-ABudv0ab4ixsp3u-K9J7AUwabXnekIGJ5pfW9OSZAhLDl-Hjqo_l0RC1rpAAjxhW13rREQ-3mKpanpdXofipMbArV_LDWAPqOv4KPhlEX-rhCFsb2dQKpzpd0mI2D44MgwihrbuntOTaLxnbpgK0igB1yeS0K08Kx4se35fVGxns9jgmCnLBIx0GQ_ve1bm4xK9-Nt5o9MLphALpEr9oRBEmlzDJTnCMLMK0FyKU0QsXQ67GuSPPGLxdIRzxp2tAJ6XWJvu4Z-q_dMCKT2hbjRhLWwqRGd7IFW11YUXAlbAs942bjCplMfSjMSz5WRX7ZgbM2OvcjUo8zwdUEWnhTMWvD0F5tETnbaRC2iEZ7Ma3r7rw8VNcdk0JbNRNJaz_Ie7V2VyjJ_qP8fsfvmFiSzJpIA--YqspAchNzqzkT6zQ0f-aAsqw2PFlJ31ZP-ytw57yUhRy7TlZkjBLQGM_M1Hnu_-8gK7UBa1J3CmHUm5uz8A4NohaqmTweWP4ZU6BhscPQeShyAFjM1G05qVqVSpAo68v13eK_y0IRmGtYQ7vPEdPWUS6mO6ZTvklDvozvrLjeJR75D0BMcKgxxsyrhP7Zw0Gt2TBIET5GKzyAxabv8LbuvNSJyUFkiSmc4rWqEPuCpAc1CFJ0WujMBrhFSZ4skmYMy8wtCk9TjBvDS4Q6lI7r52Qup1lW_H1yQVWUDoytv2oNCNQF_r2bfMOqZNs8RhIQ4VfHJjKbxeNz6c9pwep1.adtrafficquality.google/pagead/... https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=Mve00f%2FTRW62JZu4yorYog%3D%3D&bg=!5-Sl5IbNAAa1ilLUlYo7AEcBe5WfOHGZ4W6vge_9-YfA8H-Gdxl51GFbb6M-JpAr8zxO0SVE8wGx9yhogE1x1GUrD4K_gnGriTHDD6qCXSjud6vq27ldcgIAAABNUgAAAARoAQd-ABudv0ab4ixsp3u-K9J7AUwabXnekIGJ5pfW9OSZAhLDl-Hjqo_l0RC1rpAAjxhW13rREQ-3mKpanpdXofipMbArV_LDWAPqOv4KPhlEX-rhCFsb2dQKpzpd0mI2D44MgwihrbuntOTaLxnbpgK0igB1yeS0K08Kx4se35fVGxns9jgmCnLBIx0GQ_ve1bm4xK9-Nt5o9MLphALpEr9oRBEmlzDJTnCMLMK0FyKU0QsXQ67GuSPPGLxdIRzxp2tAJ6XWJvu4Z-q_dMCKT2hbjRhLWwqRGd7IFW11YUXAlbAs942bjCplMfSjMSz5WRX7ZgbM2OvcjUo8zwdUEWnhTMWvD0F5tETnbaRC2iEZ7Ma3r7rw8VNcdk0JbNRNJaz_Ie7V2VyjJ_qP8fsfvmFiSzJpIA--YqspAchNzqzkT6zQ0f-aAsqw2PFlJ31ZP-ytw57yUhRy7TlZkjBLQGM_M1Hnu_-8gK7UBa1J3CmHUm5uz8A4NohaqmTweWP4ZU6BhscPQeShyAFjM1G05qVqVSpAo68v13eK_y0IRmGtYQ7vPEdPWUS6mO6ZTvklDvozvrLjeJR75D0BMcKgxxsyrhP7Zw0Gt2TBIET5GKzyAxabv8LbuvNSJyUFkiSmc4rWqEPuCpAc1CFJ0WujMBrhFSZ4skmYMy8wtCk9TjBvDS4Q6lI7r52Qup1lW_H1yQVWUDoytv2oNCNQF_r2bfMOqZNs8RhIQ4VfHJjKbxeNz6c9pw — 204 — 17 B — 56 ms — h3https://www.youtube-nocookie.com/youtubei/v1/log_event?alt=jsonwww.youtube-nocookie.com/youtubei/v... https://www.youtube-nocookie.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 34 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 707ms · 477KB · £10/mo
www.cambridgeenglish.org
Other
Costly
Execution 252ms
Transfer 12 KB
Monthly Cost £4/mo
Unattributable
Other
Optional
Execution 175ms
Transfer 0 KB
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Optional
Execution 119ms
Transfer 174 KB
Unused 44%
Monthly Cost £2/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 81ms
Transfer 120 KB
Unused 53%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 80ms
Transfer 171 KB
Unused 40%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.cambridgeenglish.org adds 252ms and costs ~£4/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.cambridgeenglish.org takes 252ms 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 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

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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