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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
77
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.
100
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.

1.68 s

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

2.69 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.

0.000

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

1.68 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.

2.69 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.7 MB transferred, 77 requests
FIX
4.7 MB transferred, 77 requests
Critical::
Page weighs 8.1 MB (4.7 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 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
77 HTTP requests
Info::
Estimated 0.99 g CO2 per page load
4.7 MB / 2.4 MB budget
4.7 MB transferred
77 requests
0.99 g CO2 per page load
Images 3.3 MiB 71%
JavaScript 1.1 MiB 23%
Fonts 133.4 KiB 3%
CSS 120.7 KiB 2%
Other 34.5 KiB 1%
HTML 15.5 KiB 0%
Other 2.5 KiB 0%
Other 1.8 KiB 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

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 (4.7 MiB of 4.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
29 scripts, 543 KB unused
FIX
29 scripts, 543 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-MK5...: 109 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-MK5...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://maps.googleapis.com/maps/api/js?key&ver=6....: 65 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-LQ50...: 61 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 61 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 543 KB
543 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=GT-MK57K4S&cx=c&gtm=4e64f0160 KB109 KB (68%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-MK57K4S160 KB65 KB (41%)✓3rd
https://maps.googleapis.com/maps/api/js?key&ver=6.9.4100 KB65 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-LQ502PJ7GJ157 KB61 KB (39%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202410.1.0/otBannerSdk.js112 KB61 KB (54%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P9DWG6K9131 KB58 KB (44%)✓3rd
https://corp.oup.com/wp-content/themes/oup-theme/js/lib/lottie.min.js?ver=169442660065 KB57 KB (88%)✓3rd
https://corp.oup.com/wp-content/themes/oup-theme/js/lib/fancybox.min.js?ver=169442660030 KB25 KB (85%)✓3rd
https://corp.oup.com/wp-content/plugins/wpo365-login/apps/dist/pintra-redirect.js?ver=41.229 KB22 KB (75%)✓3rd
https://corp.oup.com/wp-content/themes/oup-theme/js/lib/swiper-bundle.min.js?ver=169442660038 KB21 KB (55%)✓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
77 resources · 4.7 MB · 543 KB savings available
FIX
77 resources · 4.7 MB · 543 KB savings available
Warning::
Page weight 3.7 MB over 1MB target
Got: 4.7 MB Expected: ≤ 1 MB
Info::
~543 KB of savings available
Warning::
76 third-party resources (100% of weight)
Info::
5 resources over 200KB
77 resources · 4.7 MiB · 76 third-party 3.7 MiB over 1MB target
Image 71% · 3.3 MiB
JavaScript 23% · 1.1 MiB
Font 3% · 133.4 KiB
CSS 3% · 125.0 KiB
Other 0% · 18.5 KiB
Document 0% · 15.6 KiB

~543.3 KiB of savings available

Remove unused JavaScript: 543.3 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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://corp.oup.com/wp-content/uploads/2025/12/OU... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://corp.oup.com/wp-content/uploads/2025/02/po... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://corp.oup.com/wp-content/uploads/2025/05/Po... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://corp.oup.com/wp-content/themes/oup-theme/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://corp.oup.com/wp-content/uploads/2025/09/Wi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://corp.oup.com/wp-content/themes/oup-theme/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://corp.oup.com/wp-content/themes/oup-theme/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://corp.oup.com/wp-content/themes/oup-theme/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 3.3 MB
0 oversized -0 KB
10 legacy format
8 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

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+
JS Execution Cost
493ms total JS execution
PASS
493ms total JS execution
Info::
Unattributable: 157ms CPU time
Info::
https://corp.oup.com/: 99ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-P9D...: 99ms CPU time
Info::
https://corp.oup.com/wp-includes/js/jquery/jquery....: 84ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 54ms CPU time
Warning::
Third-party scripts: 493ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 20% Style & Layout 12% Script Parsing & Compilation 10% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable157ms45ms0ms3rd
https://corp.oup.com/99ms18ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P9DWG6K999ms85ms7ms3rd
https://corp.oup.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.184ms59ms2ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202410.1.0/otBannerSdk.js54ms34ms9ms3rd
A+
Font Loading
4 fonts (133 KB)
PASS
4 fonts (133 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

133 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.7 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 — 106 ms — font-display: swaphttps://fonts.gstatic.com/s/dmserifdisplay/v17/-nFnOHM81r4j6k0gjAW3mujVU2B2G_Bx0vrx52g.woff2-nFnOHM81r4j6k0gjAW3muj... https://fonts.gstatic.com/s/dmserifdisplay/v17/-nFnOHM81r4j6k0gjAW3mujVU2B2G_Bx0vrx52g.woff2 — 17.5 KiB — 106 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 — 109 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu0SC55K5gw.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu0SC55K5gw.woff2 — 29.9 KiB — 100 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 106 ms
Start 601 ms
Risk FOUT — text flashes from fallback to web font
-nFnOHM81r4j6k0gjAW3muj... woff2 swap
Size 17 KB
Load time 106 ms
Start 601 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 109 ms
Start 601 ms
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 30 KB
Load time 100 ms
Start 601 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
Network Waterfall
77 requests over 1613ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.7 shttps://oup.com// https://oup.com/ — 301 — 106 B — 108 ms — h2https://corp.oup.com/corp.oup.com/ https://corp.oup.com/ — 200 — 15.5 KiB — 93 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 — 129 ms — h2https://corp.oup.com/wp-content/plugins/events-calendar-pro/build/css/tribe-events-pro-mini-calendar-block.css?ver=7.7.13corp.oup.com/wp-content/plugins/eve... https://corp.oup.com/wp-content/plugins/events-calendar-pro/build/css/tribe-events-pro-mini-calendar-block.css?ver=7.7.13 — 200 — 476 B — 56 ms — h2https://corp.oup.com/wp-includes/css/dist/block-library/style.min.css?ver=6.9.4corp.oup.com/wp-includes/css/dist/b... https://corp.oup.com/wp-includes/css/dist/block-library/style.min.css?ver=6.9.4 — 200 — 15.9 KiB — 50 ms — h2https://corp.oup.com/wp-content/uploads/maxmegamenu/style.css?ver=1bf382corp.oup.com/wp-content/uploads/max... https://corp.oup.com/wp-content/uploads/maxmegamenu/style.css?ver=1bf382 — 200 — 8.1 KiB — 51 ms — h2https://corp.oup.com/wp-includes/css/dashicons.min.css?ver=6.9.4corp.oup.com/wp-includes/css/dashic... https://corp.oup.com/wp-includes/css/dashicons.min.css?ver=6.9.4 — 200 — 34.5 KiB — 72 ms — h2https://corp.oup.com/wp-content/plugins/megamenu-pro/icons/genericons/genericons/genericons.css?ver=2.2.8corp.oup.com/wp-content/plugins/meg... https://corp.oup.com/wp-content/plugins/megamenu-pro/icons/genericons/genericons/genericons.css?ver=2.2.8 — 200 — 16.0 KiB — 70 ms — h2https://corp.oup.com/wp-content/plugins/megamenu-pro/icons/fontawesome/css/font-awesome.min.css?ver=2.2.8corp.oup.com/wp-content/plugins/meg... https://corp.oup.com/wp-content/plugins/megamenu-pro/icons/fontawesome/css/font-awesome.min.css?ver=2.2.8 — 200 — 6.9 KiB — 120 ms — h2https://corp.oup.com/wp-content/plugins/megamenu-pro/icons/fontawesome5/css/all.min.css?ver=2.2.8corp.oup.com/wp-content/plugins/meg... https://corp.oup.com/wp-content/plugins/megamenu-pro/icons/fontawesome5/css/all.min.css?ver=2.2.8 — 200 — 11.7 KiB — 57 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/style.css?ver=1694426597corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/style.css?ver=1694426597 — 200 — 279 B — 58 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/custom.css?ver=1743667090corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/custom.css?ver=1743667090 — 200 — 23.7 KiB — 119 ms — h2https://corp.oup.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1corp.oup.com/wp-includes/js/jquery/... https://corp.oup.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 31.0 KiB — 121 ms — h2https://corp.oup.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1corp.oup.com/wp-includes/js/jquery/... https://corp.oup.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.0 KiB — 53 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/js/lib/swiper-bundle.min.js?ver=1694426600corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/js/lib/swiper-bundle.min.js?ver=1694426600 — 200 — 37.7 KiB — 64 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/js/lib/feather.min.js?ver=1694426600corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/js/lib/feather.min.js?ver=1694426600 — 200 — 20.1 KiB — 117 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/js/lib/aos.min.js?ver=1694426600corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/js/lib/aos.min.js?ver=1694426600 — 200 — 4.5 KiB — 67 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/js/lib/lottie.min.js?ver=1694426600corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/js/lib/lottie.min.js?ver=1694426600 — 200 — 65.3 KiB — 116 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/js/lib/fancybox.min.js?ver=1694426600corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/js/lib/fancybox.min.js?ver=1694426600 — 200 — 29.7 KiB — 116 ms — h2https://maps.googleapis.com/maps/api/js?key&ver=6.9.4maps.googleapis.com/maps/api/js?key... https://maps.googleapis.com/maps/api/js?key&ver=6.9.4 — 200 — 100.4 KiB — 251 ms — h2https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/ScrollMagic.min.js?ver=6.9.4cdnjs.cloudflare.com/ajax/libs/Scro... https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/ScrollMagic.min.js?ver=6.9.4 — 200 — 6.0 KiB — 59 ms — h3https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/plugins/debug.addIndicators.min.js?ver=6.9.4cdnjs.cloudflare.com/ajax/libs/Scro... https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/plugins/debug.addIndicators.min.js?ver=6.9.4 — 200 — 2.5 KiB — 59 ms — h3https://cdnjs.cloudflare.com/ajax/libs/gsap/3.11.3/gsap.min.js?ver=6.9.4cdnjs.cloudflare.com/ajax/libs/gsap... https://cdnjs.cloudflare.com/ajax/libs/gsap/3.11.3/gsap.min.js?ver=6.9.4 — 200 — 25.2 KiB — 73 ms — h3https://corp.oup.com/wp-content/themes/oup-theme/js/lib/gsap.js?ver=1694426600corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/js/lib/gsap.js?ver=1694426600 — 200 — 4.7 KiB — 115 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/js/scripts.js?ver=1730984267corp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/js/scripts.js?ver=1730984267 — 200 — 2.5 KiB — 115 ms — h2https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=Open+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,300;1,400;1,500;1,600;1,700;1,800&display=swapfonts.googleapis.com/css2?family=DM... https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=Open+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,300;1,400;1,500;1,600;1,700;1,800&display=swap — 200 — 3.1 KiB — 150 ms — h2https://www.googletagmanager.com/gtag/js?id=G-LQ502PJ7GJwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-LQ502PJ7GJ — 200 — 157.4 KiB — 250 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/img/oxford-logo.svgcorp.oup.com/wp-content/themes/oup-... https://corp.oup.com/wp-content/themes/oup-theme/img/oxford-logo.svg — 200 — 1.1 KiB — 113 ms — h2https://corp.oup.com/wp-content/themes/oup-theme/img/university-press-logo.svgcorp.oup.com/wp-content/themes/oup-... 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-ZF5BBXPQ2B&gtm=45Pe64f0h1v9167572867za200zb9166788724zd9166788724&_p=1776361435715&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj.dZTNiMT&are=1&cid=949668932.1776361437&frm=0&pscdl=denied&rcb=12&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117384406&sid=1776361436&sct=1&seg=0&dl=https%3A%2F%2Fcorp.oup.com%2F&dt=Homepage%20-%20Oxford%20University%20Press&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1554region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-ZF5BBXPQ2B&gtm=45Pe64f0h1v9167572867za200zb9166788724zd9166788724&_p=1776361435715&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj.dZTNiMT&are=1&cid=949668932.1776361437&frm=0&pscdl=denied&rcb=12&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117384406&sid=1776361436&sct=1&seg=0&dl=https%3A%2F%2Fcorp.oup.com%2F&dt=Homepage%20-%20Oxford%20University%20Press&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1554 — 204 — 49 B — 59 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-91PRQFD8WG&gtm=45Pe64f0h1v9167572867za200zb9166788724zd9166788724&_p=1776361435715&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj.dZTNiMT&are=1&cid=949668932.1776361437&frm=0&pscdl=denied&rcb=12&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117384406&sid=1776361436&sct=1&seg=0&dl=https%3A%2F%2Fcorp.oup.com%2F&dt=Homepage%20-%20Oxford%20University%20Press&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1559region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-91PRQFD8WG&gtm=45Pe64f0h1v9167572867za200zb9166788724zd9166788724&_p=1776361435715&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj.dZTNiMT&are=1&cid=949668932.1776361437&frm=0&pscdl=denied&rcb=12&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.55%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117384406&sid=1776361436&sct=1&seg=0&dl=https%3A%2F%2Fcorp.oup.com%2F&dt=Homepage%20-%20Oxford%20University%20Press&en=page_view&_fv=1&_ss=1&_ee=1&tfd=1559 — 204 — 49 B — 54 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 493ms · 289KB · $7/mo
Unattributable
Other
Optional
Execution 157ms
Transfer 0 KB
Monthly Cost $2/mo
corp.oup.com
Other
Optional
Execution 99ms
Transfer 15 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 131 KB
Unused 44%
Monthly Cost $1/mo
corp.oup.com
Other
Optional
Execution 84ms
Transfer 31 KB
Monthly Cost $1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 54ms
Transfer 112 KB
Unused 54%
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

54% 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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