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https://vocabulary.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
74
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.
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.

1.58 s

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

2.04 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.

0.200

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

1.59 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.

2.04 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 3 REVIEW 4 FIX
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 (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
20 scripts, 628 KB unused
FIX
20 scripts, 628 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.vocabulary.com/js3/mixpanel.bAyToM0F.b...: 97 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 628 KB
628 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://cdn.vocabulary.com/js3/mixpanel.bAyToM0F.bundle.js125 KB97 KB (78%)✓3rd
https://cdn.vocabulary.com/js3/_virtual-global_jquery._T_WmgQT.chunk.js0 KB—✓3rd
https://cdn.vocabulary.com/js3/_virtual-global_js2Module.-4Y5RQSU.chunk.js1 KB—✓3rd
https://cdnapi.kaltura.com/p/4764982/sp/476498200/embedIframeJs/uiconf_id/51260142/partner_id/476498222 KB—✓3rd
https://cdn.vocabulary.com/js/vcom/cmp-558kst.js1 KB—✓3rd
https://cdn.vocabulary.com/js/vcom/analytics/mixpanel-yoct14.js2 KB—✓3rd
https://cdn.vocabulary.com/js/vcom/apply-carousel/testimonials-home-learner-pages-1kmkc7z.js4 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

F
Page Weight Inventory
Action
103 resources · 2.0 MB · 628 KB savings available
FIX
103 resources · 2.0 MB · 628 KB savings available
Warning::
Page weight 1.0 MB over 1MB target
Got: 2.0 MB Expected: ≤ 1 MB
Info::
~628 KB of savings available
Warning::
102 third-party resources (100% of weight)
Info::
2 resources over 200KB
103 resources · 2.0 MiB · 102 third-party 1.0 MiB over 1MB target
JavaScript 46% · 951.0 KiB
Image 36% · 741.4 KiB
Font 11% · 218.2 KiB
CSS 5% · 105.5 KiB
Document 2% · 40.6 KiB
Other 0% · 1.8 KiB

~627.9 KiB of savings available

Remove unused JavaScript: 627.9 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
Page Weight Budget
Action
2.0 MB transferred, 103 requests
REVIEW
2.0 MB transferred, 103 requests
Info::
Page weighs 4.9 MB (2.0 MB transferred)
Warning::
JavaScript is 951 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 951 KB
Info::
Fonts are 218 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 218 KB
Warning::
103 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
103 requests
0.42 g CO2 per page load
JavaScript 951.0 KiB 46%
Images 739.7 KiB 36%
Fonts 218.2 KiB 11%
CSS 105.5 KiB 5%
HTML 40.4 KiB 2%
Other 2.6 KiB 0%
Other 1.1 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

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

C
Image Optimization
Action
55 images, 0 KB saveable
REVIEW
55 images, 0 KB saveable
Warning::
https://cdn.vocabulary.com/images/footer/logo-abcy... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/home/awards/the-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-rose... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-span... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-voca... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/home/looking-for... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-ingl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-tpt-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/home/awards/tech... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/home/awards/tech... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-fren... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-ixl-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-wyza... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-emme... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/home/looking-for... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/home/awards/read... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-educ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.vocabulary.com/images/footer/logo-ixl-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
55 images 740 KB
0 oversized -0 KB
55 legacy format
18 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

B
JS Execution Cost
569ms total JS execution
REVIEW
569ms total JS execution
Info::
Unattributable: 196ms CPU time
Info::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 187ms CPU time
Info::
https://www.vocabulary.com/: 186ms CPU time
Warning::
Third-party scripts: 569ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 32% Style & Layout 18% Script Parsing & Compilation 5% Rendering 3% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable196ms4ms0ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js187ms156ms22ms3rd
https://www.vocabulary.com/186ms31ms2ms3rd
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
4 fonts (218 KB)
PASS
4 fonts (218 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

218 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 FCP 1.6 s LCP 2.0 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 — 56 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 — 61 ms — font-display: swaphttps://fonts.gstatic.com/s/merriweather/v33/u-4c0qyriQwlOrhSvowK_l5-eTxCVx0ZbwLvKH2Gk9hLmp0v5yA-xXPqCzLvF-udrHOg7iA.woff2u-4c0qyriQwlOrhSvowK_l5... https://fonts.gstatic.com/s/merriweather/v33/u-4c0qyriQwlOrhSvowK_l5-eTxCVx0ZbwLvKH2Gk9hLmp0v5yA-xXPqCzLvF-udrHOg7iA.woff2 — 98.3 KiB — 45 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 66 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 56 ms
Start 950 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 61 ms
Start 950 ms
Risk FOUT — text flashes from fallback to web font
u-4c0qyriQwlOrhSvowK_l5... woff2 swap
Size 98 KB
Load time 45 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 66 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
103 requests over 1947ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.6 s LCP 2.0 shttps://vocabulary.com// https://vocabulary.com/ — 301 — 717 B — 374 ms — h2https://www.vocabulary.com/www.vocabulary.com/ https://www.vocabulary.com/ — 200 — 12.7 KiB — 428 ms — h2https://fonts.googleapis.com/css2?family=Merriweather:ital,wght@0,300;0,400;0,700;1,300;1,400;1,700&family=Open+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swapfonts.googleapis.com/css2?family=Me... https://fonts.googleapis.com/css2?family=Merriweather:ital,wght@0,300;0,400;0,700;1,300;1,400;1,700&family=Open+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swap — 200 — 3.2 KiB — 86 ms — h2https://cdn.vocabulary.com/css/header-18eveua.csscdn.vocabulary.com/css/header-18eve... https://cdn.vocabulary.com/css/header-18eveua.css — 200 — 4.8 KiB — 44 ms — h2https://cdn.vocabulary.com/css/main-1knvpzy.csscdn.vocabulary.com/css/main-1knvpzy... https://cdn.vocabulary.com/css/main-1knvpzy.css — 200 — 7.4 KiB — 42 ms — h2https://cdn.vocabulary.com/css/progress-1x2p62h.csscdn.vocabulary.com/css/progress-1x2... https://cdn.vocabulary.com/css/progress-1x2p62h.css — 200 — 1.1 KiB — 32 ms — h2https://cdn.vocabulary.com/css/dictionary-1nvmifl.csscdn.vocabulary.com/css/dictionary-1... https://cdn.vocabulary.com/css/dictionary-1nvmifl.css — 200 — 7.0 KiB — 37 ms — h2https://cdn.vocabulary.com/css/achievements-4to21o.csscdn.vocabulary.com/css/achievements... https://cdn.vocabulary.com/css/achievements-4to21o.css — 200 — 14.9 KiB — 51 ms — h2https://cdn.vocabulary.com/css/leaderboards-xxg0un.csscdn.vocabulary.com/css/leaderboards... https://cdn.vocabulary.com/css/leaderboards-xxg0un.css — 200 — 1.7 KiB — 46 ms — h2https://cdn.vocabulary.com/css/fonts/ss-social-circle-e51wc0.csscdn.vocabulary.com/css/fonts/ss-soc... https://cdn.vocabulary.com/css/fonts/ss-social-circle-e51wc0.css — 200 — 1.4 KiB — 48 ms — h2https://cdn.vocabulary.com/css/fonts/ss-symbolicons-block-67mxq6.csscdn.vocabulary.com/css/fonts/ss-sym... https://cdn.vocabulary.com/css/fonts/ss-symbolicons-block-67mxq6.css — 200 — 7.0 KiB — 38 ms — h2https://cdn.vocabulary.com/css/fonts/ss-standard-5s5b7z.csscdn.vocabulary.com/css/fonts/ss-sta... https://cdn.vocabulary.com/css/fonts/ss-standard-5s5b7z.css — 200 — 2.6 KiB — 34 ms — h2https://cdn.vocabulary.com/css/home-1v1i9vp.csscdn.vocabulary.com/css/home-1v1i9vp... https://cdn.vocabulary.com/css/home-1v1i9vp.css — 200 — 3.0 KiB — 32 ms — h2https://cdn.vocabulary.com/css/bowl/carousel-ikwu41.csscdn.vocabulary.com/css/bowl/carouse... https://cdn.vocabulary.com/css/bowl/carousel-ikwu41.css — 200 — 869 B — 49 ms — h2https://www.google.com/recaptcha/enterprise.js?render=6LeddZEqAAAAAHAYLf9Sz82cN_hk-HFe_coTdqNAwww.google.com/recaptcha/enterprise... https://www.google.com/recaptcha/enterprise.js?render=6LeddZEqAAAAAHAYLf9Sz82cN_hk-HFe_coTdqNA — 200 — 1.1 KiB — 76 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 362.4 KiB — 179 ms — h2https://cdn.vocabulary.com/lib/jquery-1eev1tf.jscdn.vocabulary.com/lib/jquery-1eev1... https://cdn.vocabulary.com/lib/jquery-1eev1tf.js — 200 — 30.6 KiB — 29 ms — h2https://cdn.vocabulary.com/js/module-15xwhp0.jscdn.vocabulary.com/js/module-15xwhp... https://cdn.vocabulary.com/js/module-15xwhp0.js — 200 — 24.9 KiB — 31 ms — h2https://cdn.vocabulary.com/js3/mixpanel.bAyToM0F.bundle.jscdn.vocabulary.com/js3/mixpanel.bAy... https://cdn.vocabulary.com/js3/mixpanel.bAyToM0F.bundle.js — 200 — 124.8 KiB — 106 ms — h2https://cdn.vocabulary.com/images/header/logo-1wobq9i.pngcdn.vocabulary.com/images/header/lo... https://cdn.vocabulary.com/images/header/logo-1wobq9i.png — 200 — 14.5 KiB — 30 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 569ms · 13KB · €6/mo
Unattributable
Other
Optional
Execution 196ms
Transfer 0 KB
Monthly Cost €2/mo
www.gstatic.com
Other
Optional
Execution 187ms
Transfer 0 KB
Unused 49%
Monthly Cost €2/mo
www.vocabulary.com
Other
Optional
Execution 186ms
Transfer 13 KB
Monthly Cost €2/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

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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