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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
45
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

3.17 s

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

3.36 s

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

432 ms

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

0.034

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

3.31 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.

5.54 s

Page Load Progression

426 ms
853 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 51 requests
FIX
2.6 MB transferred, 51 requests
Warning::
Page weighs 5.4 MB (2.6 MB transferred)
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
Fonts are 604 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 604 KB
Info::
CSS is 260 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 260 KB
Info::
51 HTTP requests
Info::
Estimated 0.54 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
51 requests
0.54 g CO2 per page load
JavaScript 1.0 MiB 40%
Fonts 604.0 KiB 23%
Images 567.6 KiB 21%
CSS 260.5 KiB 10%
HTML 148.0 KiB 6%
Other 8.8 KiB 0%
Other 1.5 KiB 0%
Other 789 B 0%
Other 596 B 0%
Other 328 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

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

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

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 (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
10 scripts, 522 KB unused
FIX
10 scripts, 522 KB unused
Warning::
https://www.unesco.org/sites/default/files/js/js_K...: 176 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-E1YT...: 110 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0NXZ...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-E1YT...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T9N...: 61 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 522 KB
522 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.unesco.org/sites/default/files/js/js_K1DPmqnbaP5UHEG9KAqunQXU78XPkYX2RjqxcKFVy_Q.js?scope=footer&delta=1&language=en&theme=unesco&include=eJxdjVEKw0AIRC-Uxa-eJ6iVTRqjixpCb99ASyn9muHxmCH3ygocN6BvbY9siiVZ02GS7NDVCbVlPXW1_qEz-767AaGZxB-8hnj7cVMweIF3TKfQMeZ0DbhfR4HWZay8SbwALsE5DA224 KB176 KB (79%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-E1YT8ZEB8P&cx=c&gtm=4e64f0h1157 KB110 KB (70%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0NXZYG9QXM&cx=c&gtm=4e64f0h1157 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-E1YT8ZEB8P157 KB65 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T9NW&gtm_auth=_Lm02Fa-1lLDW1vNzj8zTg&gtm_preview=env-2&gtm_cookies_win=x130 KB61 KB (47%)✓3rd
https://www.unesco.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.078 KB43 KB (56%)✓3rd
https://www.unesco.org/TSPD/?type=183 KB—✓3rd
https://tag.aticdn.net/js-sdk/piano-analytics-6.16.4.js27 KB—✓3rd
https://www.unesco.org/TSPD/080713870fab2000d8d2dc88833d1464c8d2ca5a0467c4bc487c59c72e5eafb2214140177e3bc928?type=886 KB—✓3rd
https://www.unesco.org/TSPD/080713870fab2000d8d2dc88833d1464c8d2ca5a0467c4bc487c59c72e5eafb2214140177e3bc928?type=1237 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
51 resources · 2.6 MB · 522 KB savings available
FIX
51 resources · 2.6 MB · 522 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~522 KB of savings available
Warning::
50 third-party resources (100% of weight)
Info::
1 resources over 200KB
51 resources · 2.6 MiB · 50 third-party 1.6 MiB over 1MB target
JavaScript 40% · 1.0 MiB
Font 23% · 604.0 KiB
Image 22% · 576.1 KiB
CSS 10% · 260.5 KiB
Document 6% · 148.8 KiB
Other 0% · 2.6 KiB

~522.0 KiB of savings available

Remove unused JavaScript: 522.0 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://www.unesco.org/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unesco.org/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unesco.org/themes/custom/bunesco8/asse... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unesco.org/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unesco.org/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 568 KB
0 oversized -0 KB
4 legacy format
6 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

Performance issues directly impact user engagement and conversion rates.

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
JS Execution Cost
Action
1728ms total JS execution
REVIEW
1728ms total JS execution
Warning::
https://www.unesco.org/TSPD/080713870fab2000d8d2dc...: 927ms CPU time
Info::
https://www.unesco.org/en: 234ms CPU time
Info::
Unattributable: 200ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-T9N...: 116ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-E1YT...: 98ms CPU time
Warning::
Third-party scripts: 1728ms (100% of total)

Main Thread Breakdown

Script Evaluation 67% Other 14% Style & Layout 9% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.unesco.org/TSPD/080713870fab2000d8d2dc88833d1464c8d2ca5a0467c4bc487c59c72e5eafb2214140177e3bc928?type=8927ms884ms7ms3rd
https://www.unesco.org/en234ms6ms1ms3rd
Unattributable200ms6ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T9NW&gtm_auth=_Lm02Fa-1lLDW1vNzj8zTg&gtm_preview=env-2&gtm_cookies_win=x116ms98ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-E1YT8ZEB8P98ms83ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0NXZYG9QXM&cx=c&gtm=4e64f0h180ms69ms10ms3rd
https://www.unesco.org/sites/default/files/js/js_K1DPmqnbaP5UHEG9KAqunQXU78XPkYX2RjqxcKFVy_Q.js?scope=footer&delta=1&language=en&theme=unesco&include=eJxdjVEKw0AIRC-Uxa-eJ6iVTRqjixpCb99ASyn9muHxmCH3ygocN6BvbY9siiVZ02GS7NDVCbVlPXW1_qEz-767AaGZxB-8hnj7cVMweIF3TKfQMeZ0DbhfR4HWZay8SbwALsE5DA74ms44ms14ms3rd
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
6 fonts (604 KB)
PASS
6 fonts (604 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

604 KB total

Render-blocking

0

of 6

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 FCP 3.2 s LCP 3.4 shttps://www.unesco.org/themes/custom/bunesco8/assets/fonts/inter/Inter-Regular.woff2Inter-Regular.woff2 https://www.unesco.org/themes/custom/bunesco8/assets/fonts/inter/Inter-Regular.woff2 — 90.8 KiB — 321 ms — font-display: swaphttps://www.unesco.org/themes/custom/bunesco8/assets/fonts/inter/Inter-SemiBold.woff2Inter-SemiBold.woff2 https://www.unesco.org/themes/custom/bunesco8/assets/fonts/inter/Inter-SemiBold.woff2 — 98.4 KiB — 192 ms — font-display: swaphttps://www.unesco.org/themes/custom/bunesco8/assets/fonts/MaterialIconsSharp/MaterialIconsSharp.woff2MaterialIconsSharp.woff2 https://www.unesco.org/themes/custom/bunesco8/assets/fonts/MaterialIconsSharp/MaterialIconsSharp.woff2 — 133.8 KiB — 381 ms — font-display: swaphttps://www.unesco.org/themes/custom/bunesco8/assets/fonts/inter/Inter-Bold.woff2Inter-Bold.woff2 https://www.unesco.org/themes/custom/bunesco8/assets/fonts/inter/Inter-Bold.woff2 — 98.7 KiB — 463 ms — font-display: swaphttps://www.unesco.org/themes/custom/bunesco8/assets/fonts/inter/Inter-Medium.woff2Inter-Medium.woff2 https://www.unesco.org/themes/custom/bunesco8/assets/fonts/inter/Inter-Medium.woff2 — 97.7 KiB — 461 ms — font-display: swaphttps://www.unesco.org/themes/custom/bunesco8/assets/fonts/icons//unesco.ttf?3=unesco.ttf https://www.unesco.org/themes/custom/bunesco8/assets/fonts/icons//unesco.ttf?3= — 84.6 KiB — 328 ms — font-display: swap
Inter-Regular.woff2 woff2 swap
Size 91 KB
Load time 321 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
Inter-SemiBold.woff2 woff2 swap
Size 98 KB
Load time 192 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
MaterialIconsSharp.woff2 woff2 swap
Size 134 KB
Load time 381 ms
Start 2.3 s
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
Inter-Bold.woff2 woff2 swap
Size 99 KB
Load time 463 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
Inter-Medium.woff2 woff2 swap
Size 98 KB
Load time 461 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
unesco.ttf ttf swap
Size 85 KB
Load time 328 ms
Start 2.3 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~92 KB and ~184 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
Network Waterfall
51 requests over 5016ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.2 s LCP 3.4 shttps://unesco.org// https://unesco.org/ — 302 — 127 B — 621 ms — http/1.0https://www.unesco.org/www.unesco.org/ https://www.unesco.org/ — 302 — 129 B — 621 ms — http/1.0https://www.unesco.org/enwww.unesco.org/en https://www.unesco.org/en — 200 — 140.8 KiB — 1.1 s — http/1.1https://www.unesco.org/sites/default/files/css/css_RhgiPF-Y_lRBRonHf40eAaTYD1T7U1DiltqTomUEiOQ.css?delta=0&language=en&theme=unesco&include=eJxdjcEKAyEMRH_Irqd-T0k0uNJoJKOU7dd3oYctvc3MG3hsNjGdxj0yQQJfvagx6Q3z0NrLL2kCUBGEpAQcsVuWkMzlTN5I61vCIKdyvnfE7GuQbteyrT4Wa8UuOeDAlPa1ry5I9m9-Ca_xgKnHTFOcepFR01P8A4seSkQwww.unesco.org/sites/default/files/... https://www.unesco.org/sites/default/files/css/css_RhgiPF-Y_lRBRonHf40eAaTYD1T7U1DiltqTomUEiOQ.css?delta=0&language=en&theme=unesco&include=eJxdjcEKAyEMRH_Irqd-T0k0uNJoJKOU7dd3oYctvc3MG3hsNjGdxj0yQQJfvagx6Q3z0NrLL2kCUBGEpAQcsVuWkMzlTN5I61vCIKdyvnfE7GuQbteyrT4Wa8UuOeDAlPa1ry5I9m9-Ca_xgKnHTFOcepFR01P8A4seSkQ — 200 — 2.7 KiB — 452 ms — http/1.1https://www.unesco.org/sites/default/files/css/css_2zsUCRkuT-PqkbvdrAWBL2xfEhPj1x9BRPBychxBK9A.css?delta=1&language=en&theme=unesco&include=eJxdjcEKAyEMRH_Irqd-T0k0uNJoJKOU7dd3oYctvc3MG3hsNjGdxj0yQQJfvagx6Q3z0NrLL2kCUBGEpAQcsVuWkMzlTN5I61vCIKdyvnfE7GuQbteyrT4Wa8UuOeDAlPa1ry5I9m9-Ca_xgKnHTFOcepFR01P8A4seSkQwww.unesco.org/sites/default/files/... https://www.unesco.org/sites/default/files/css/css_2zsUCRkuT-PqkbvdrAWBL2xfEhPj1x9BRPBychxBK9A.css?delta=1&language=en&theme=unesco&include=eJxdjcEKAyEMRH_Irqd-T0k0uNJoJKOU7dd3oYctvc3MG3hsNjGdxj0yQQJfvagx6Q3z0NrLL2kCUBGEpAQcsVuWkMzlTN5I61vCIKdyvnfE7GuQbteyrT4Wa8UuOeDAlPa1ry5I9m9-Ca_xgKnHTFOcepFR01P8A4seSkQ — 200 — 53.3 KiB — 464 ms — http/1.1https://www.unesco.org/sites/default/files/css/css_3kqF62EnYgkIMtbtEXGzsoUL0s1gPPmXJh1GkDo2GJk.css?delta=3&language=en&theme=unesco&include=eJxdjcEKAyEMRH_Irqd-T0k0uNJoJKOU7dd3oYctvc3MG3hsNjGdxj0yQQJfvagx6Q3z0NrLL2kCUBGEpAQcsVuWkMzlTN5I61vCIKdyvnfE7GuQbteyrT4Wa8UuOeDAlPa1ry5I9m9-Ca_xgKnHTFOcepFR01P8A4seSkQwww.unesco.org/sites/default/files/... https://www.unesco.org/sites/default/files/css/css_3kqF62EnYgkIMtbtEXGzsoUL0s1gPPmXJh1GkDo2GJk.css?delta=3&language=en&theme=unesco&include=eJxdjcEKAyEMRH_Irqd-T0k0uNJoJKOU7dd3oYctvc3MG3hsNjGdxj0yQQJfvagx6Q3z0NrLL2kCUBGEpAQcsVuWkMzlTN5I61vCIKdyvnfE7GuQbteyrT4Wa8UuOeDAlPa1ry5I9m9-Ca_xgKnHTFOcepFR01P8A4seSkQ — 200 — 199.5 KiB — 765 ms — http/1.1https://www.unesco.org/themes/custom/bunesco8/assets/images/logo/logo.svgwww.unesco.org/themes/custom/bunesc... https://www.unesco.org/themes/custom/bunesco8/assets/images/logo/logo.svg — 200 — 3.4 KiB — 471 ms — http/1.1https://www.unesco.org/themes/custom/bunesco8/assets/images/logo/logo-blue.svgwww.unesco.org/themes/custom/bunesc... https://www.unesco.org/themes/custom/bunesco8/assets/images/logo/logo-blue.svg — 200 — 3.4 KiB — 471 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-T9NW&gtm_auth=_Lm02Fa-1lLDW1vNzj8zTg&gtm_preview=env-2&gtm_cookies_win=xwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-T9NW&gtm_auth=_Lm02Fa-1lLDW1vNzj8zTg&gtm_preview=env-2&gtm_cookies_win=x — 200 — 130.4 KiB — 101 ms — h2https://www.unesco.org/sites/default/files/css/css_zZF9HsYc_UamnZFdLhV43yUCdH0yfS6lLbC0Y7SO2CA.css?delta=2&language=en&theme=unesco&include=eJxdjcEKAyEMRH_Irqd-T0k0uNJoJKOU7dd3oYctvc3MG3hsNjGdxj0yQQJfvagx6Q3z0NrLL2kCUBGEpAQcsVuWkMzlTN5I61vCIKdyvnfE7GuQbteyrT4Wa8UuOeDAlPa1ry5I9m9-Ca_xgKnHTFOcepFR01P8A4seSkQwww.unesco.org/sites/default/files/... 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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 1728ms · 895KB · €19/mo
www.unesco.org
Other
Costly
Execution 927ms
Transfer 86 KB
Monthly Cost €10/mo
www.unesco.org
Other
Costly
Execution 234ms
Transfer 141 KB
Monthly Cost €3/mo
Unattributable
Other
Costly
Execution 200ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 116ms
Transfer 130 KB
Unused 47%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 98ms
Transfer 157 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 80ms
Transfer 157 KB
Unused 42%
Monthly Cost €1/mo
www.unesco.org
Other
Optional
Execution 74ms
Transfer 224 KB
Unused 79%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.unesco.org adds 927ms and costs ~€10/month
  • www.unesco.org adds 234ms and costs ~€3/month
  • Unattributable adds 200ms 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

www.unesco.org takes 927ms 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

www.unesco.org takes 234ms 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

Unattributable takes 200ms 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

79% of www.unesco.org'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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