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https://oxforddictionaries.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
60
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.
100
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.

1.52 s

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

7.59 s

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

178 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.

2.61 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.

7.67 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 4 REVIEW 4 FIX
F
Page Weight Budget
Action
9.5 MB transferred, 79 requests
FIX
9.5 MB transferred, 79 requests
Critical::
Page weighs 11.3 MB (9.5 MB transferred)
Warning::
Images are 8.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 8.3 MB
Info::
Fonts are 380 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 380 KB
Info::
79 HTTP requests
Info::
Estimated 2.0 g CO2 per page load
9.5 MB / 2.4 MB budget
9.5 MB transferred
79 requests
2.0 g CO2 per page load
Images 8.3 MiB 87%
JavaScript 419.2 KiB 4%
Other 400.8 KiB 4%
Fonts 380.0 KiB 4%
Other 38.8 KiB 0%
CSS 37.5 KiB 0%
HTML 33.8 KiB 0%
Other 1.0 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

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (9.5 MiB of 9.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
79 resources · 9.5 MB · 61 KB savings available
FIX
79 resources · 9.5 MB · 61 KB savings available
Warning::
Page weight 8.5 MB over 1MB target
Got: 9.5 MB Expected: ≤ 1 MB
Info::
~61 KB of savings available
Warning::
78 third-party resources (100% of weight)
Info::
4 resources over 200KB
79 resources · 9.5 MiB · 78 third-party 8.5 MiB over 1MB target
Image 87% · 8.3 MiB
JavaScript 4% · 436.8 KiB
Media 4% · 392.4 KiB
Font 4% · 380.0 KiB
CSS 0% · 41.8 KiB
Document 0% · 34.1 KiB
Other 0% · 24.9 KiB

~61.1 KiB of savings available

Remove unused JavaScript: 61.1 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, max-age=0

DirectiveValueMeaning
no-store—Never cache this response
max-age0Cache for 0 seconds
B
Image Optimization
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 8.3 MB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
902ms total JS execution
REVIEW
902ms total JS execution
Warning::
https://languages.oup.com/wp-content/plugins/guten...: 407ms CPU time
Info::
https://languages.oup.com/: 227ms CPU time
Info::
Unattributable: 122ms CPU time
Info::
https://v0.wordpress.com/js/next/videopress-iframe...: 88ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 58ms CPU time
Warning::
Third-party scripts: 902ms (100% of total)

Main Thread Breakdown

Other 64% Style & Layout 17% Script Evaluation 14%
ScriptTotalScriptingParse/CompileParty
https://languages.oup.com/wp-content/plugins/gutenberg/build/modules/interactivity/index.min.js?ver=4d2a3a72c7410d548881407ms2ms0ms3rd
https://languages.oup.com/227ms2ms2ms3rd
Unattributable122ms27ms0ms3rd
https://v0.wordpress.com/js/next/videopress-iframe.js?m=177010725088ms35ms0ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202409.1.0/otBannerSdk.js58ms34ms13ms3rd
B
JS Bundles
23 scripts, 61 KB unused
REVIEW
23 scripts, 61 KB unused
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 61 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 61 KB
61 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn-ukwest.onetrust.com/scripttemplates/202409.1.0/otBannerSdk.js111 KB61 KB (55%)✓3rd
https://languages.oup.com/wp-includes/js/dist/vendor/wp-polyfill.min.js?m=176103084212 KB—✓3rd
https://languages.oup.com/wp-content/plugins/jetpack/_inc/build/tiled-gallery/tiled-gallery/tiled-gallery.min.js?ver=15.7.11 KB—✓3rd
https://s0.wp.com/wp-content/plugins/video/assets/js/videojs/videopress-iframe-api.js?ver=2026173 KB—✓3rd
https://languages.oup.com/wp-content/plugins/gutenberg/build/scripts/dom-ready/index.min.js?ver=a06281ae5cf5500e93171 KB—✓3rd
https://cdn-ukwest.onetrust.com/consent/019092e7-fbb7-7ccc-8e42-27bfa2a06757/OtAutoBlock.js2 KB—✓3rd
https://v0.wordpress.com/js/next/videopress-iframe.js?m=17701072502 KB—✓3rd
https://cdn-ukwest.onetrust.com/consent/019092e7-fbb7-7ccc-8e42-27bfa2a06757/019092e7-fbb7-7ccc-8e42-27bfa2a06757.json3 KB—✓3rd
https://languages.oup.com/wp-content/plugins/gutenberg/build/modules/interactivity/index.min.js?ver=4d2a3a72c7410d54888116 KB—✓3rd
https://languages.oup.com/wp-content/plugins/jetpack/_inc/build/carousel/jetpack-carousel.min.js?m=17765572058 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

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 (380 KB)
PASS
7 fonts (380 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

380 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.5 s LCP 7.6 shttps://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0C4iY1M2xLER.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0C4iY1M2xLER.woff2 — 58.3 KiB — 152 ms — font-display: swaphttps://fonts.gstatic.com/s/dmserifdisplay/v15/-nFnOHM81r4j6k0gjAW3mujVU2B2K_J709jy92k.woff2-nFnOHM81r4j6k0gjAW3muj... https://fonts.gstatic.com/s/dmserifdisplay/v15/-nFnOHM81r4j6k0gjAW3mujVU2B2K_J709jy92k.woff2 — 29.5 KiB — 142 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0Rk8ZkaVIUwaERZjA.woff2memQYaGs126MiZpBA-UFUIc... https://fonts.gstatic.com/s/opensans/v40/memQYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWq8tWZ0Pw86hd0Rk8ZkaVIUwaERZjA.woff2 — 61.1 KiB — 172 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjr0C4iY1M2xLER.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjr0C4iY1M2xLER.woff2 — 58.5 KiB — 168 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0C4iY1M2xLER.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsiH0C4iY1M2xLER.woff2 — 58.1 KiB — 61 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1y4iY1M2xLER.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsg-1y4iY1M2xLER.woff2 — 56.3 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1y4iY1M2xLER.woff2memSYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsgH1y4iY1M2xLER.woff2 — 58.1 KiB — 27 ms — font-display: swap
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 58 KB
Load time 152 ms
Start 707 ms
Risk FOUT — text flashes from fallback to web font
-nFnOHM81r4j6k0gjAW3muj... woff2 swap
Size 30 KB
Load time 142 ms
Start 708 ms
Risk FOUT — text flashes from fallback to web font
memQYaGs126MiZpBA-UFUIc... woff2 swap
Size 61 KB
Load time 172 ms
Start 708 ms
Risk FOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 59 KB
Load time 168 ms
Start 714 ms
Risk FOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 58 KB
Load time 61 ms
Start 824 ms
Risk FOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 56 KB
Load time 52 ms
Start 834 ms
Risk FOUT — text flashes from fallback to web font
memSYaGs126MiZpBA-UvWbX... woff2 swap
Size 58 KB
Load time 27 ms
Start 1.6 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
79 requests over 2269ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.5 s LCP 7.6 shttps://oxforddictionaries.com// https://oxforddictionaries.com/ — 301 — 242 B — 462 ms — h2https://languages.oup.com/languages.oup.com/ https://languages.oup.com/ — 200 — 30.0 KiB — 67 ms — h2https://cdn-ukwest.onetrust.com/consent/019092e7-fbb7-7ccc-8e42-27bfa2a06757/OtAutoBlock.jscdn-ukwest.onetrust.com/consent/019... https://cdn-ukwest.onetrust.com/consent/019092e7-fbb7-7ccc-8e42-27bfa2a06757/OtAutoBlock.js — 200 — 2.3 KiB — 92 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 — 70 ms — h2https://languages.oup.com/wp-content/plugins/gutenberg/build/styles/block-library/navigation/style.min.css?m=1775952532languages.oup.com/wp-content/plugin... https://languages.oup.com/wp-content/plugins/gutenberg/build/styles/block-library/navigation/style.min.css?m=1775952532 — 200 — 2.7 KiB — 25 ms — h2https://languages.oup.com/wp-content/plugins/gutenberg/build/styles/block-library/cover/style.min.css?m=1775952532languages.oup.com/wp-content/plugin... https://languages.oup.com/wp-content/plugins/gutenberg/build/styles/block-library/cover/style.min.css?m=1775952532 — 200 — 1.9 KiB — 22 ms — h2https://languages.oup.com/_static/??-eJydy1EKgCAMANALZUOo9Cc6y9Khgi1xq64fXaH3/+BpJpysxAqtXqmwQOp4o2I3xBk5UIT9KjVCQ1XqLEYydopjEBngz6dY9NvbsVrnJu+W2dsXVLszAQ==languages.oup.com/_static/??-eJydy1... https://languages.oup.com/_static/??-eJydy1EKgCAMANALZUOo9Cc6y9Khgi1xq64fXaH3/+BpJpysxAqtXqmwQOp4o2I3xBk5UIT9KjVCQ1XqLEYydopjEBngz6dY9NvbsVrnJu+W2dsXVLszAQ== — 200 — 737 B — 62 ms — h2https://languages.oup.com/wp-content/plugins/gravatar-enhanced/build/patterns-view.css?m=1774876581languages.oup.com/wp-content/plugin... https://languages.oup.com/wp-content/plugins/gravatar-enhanced/build/patterns-view.css?m=1774876581 — 200 — 159 B — 24 ms — 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https://languages.oup.com/wp-content/plugins/jetpack/jetpack_vendor/automattic/jetpack-videopress/build/lib/token-bridge.js?ver=0.36.4 — 200 — 4.2 KiB — 30 ms — h2https://s0.wp.com/wp-content/plugins/video/assets/js/videojs/videopress-iframe-api.js?ver=202617s0.wp.com/wp-content/plugins/video/... https://s0.wp.com/wp-content/plugins/video/assets/js/videojs/videopress-iframe-api.js?ver=202617 — 200 — 2.6 KiB — 10 ms — h2https://languages.oup.com/wp-content/plugins/gutenberg/build/scripts/dom-ready/index.min.js?ver=a06281ae5cf5500e9317languages.oup.com/wp-content/plugin... https://languages.oup.com/wp-content/plugins/gutenberg/build/scripts/dom-ready/index.min.js?ver=a06281ae5cf5500e9317 — 200 — 531 B — 28 ms — h2https://languages.oup.com/wp-includes/js/dist/vendor/wp-polyfill.min.js?m=1761030842languages.oup.com/wp-includes/js/di... https://languages.oup.com/wp-includes/js/dist/vendor/wp-polyfill.min.js?m=1761030842 — 200 — 12.1 KiB — 26 ms — 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— 6 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 902ms · 159KB · €10/mo
languages.oup.com
Other
Costly
Execution 407ms
Transfer 16 KB
Monthly Cost €4/mo
languages.oup.com
Other
Costly
Execution 227ms
Transfer 30 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 122ms
Transfer 0 KB
Monthly Cost €1/mo
v0.wordpress.com
Other
Optional
Execution 88ms
Transfer 2 KB
Monthly Cost €1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 58ms
Transfer 111 KB
Unused 55%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • languages.oup.com adds 407ms and costs ~€4/month
  • languages.oup.com adds 227ms and costs ~€2/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

languages.oup.com takes 407ms 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

languages.oup.com takes 227ms 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

55% 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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