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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

7.13 s

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

7.55 s

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

3.40 s

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.

8.80 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.

19.54 s

Page Load Progression

396 ms
793 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
17
7 PASS 2 REVIEW 6 FIX
D
Page Weight Budget
Action
2.2 MB transferred, 52 requests
FIX
2.2 MB transferred, 52 requests
Info::
Page weighs 5.1 MB (2.2 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 605 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 605 KB
Info::
CSS is 211 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 211 KB
Info::
52 HTTP requests
Info::
Estimated 0.47 g CO2 per page load
2.2 MB / 2.4 MB budget
2.2 MB transferred
52 requests
0.47 g CO2 per page load
JavaScript 1.0 MiB 46%
Fonts 604.7 KiB 26%
Images 252.9 KiB 11%
CSS 211.1 KiB 9%
HTML 148.0 KiB 6%
Other 8.8 KiB 0%
Other 1.5 KiB 0%
Other 789 B 0%
Other 596 B 0%
Other 326 B 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

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 (2.2 MiB of 2.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6443ms total JS execution
FIX
6443ms total JS execution
Warning::
https://www.unesco.org/TSPD/080713870fab2000d8d2dc...: 3135ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T9N...: 605ms CPU time
Warning::
Unattributable: 599ms CPU time
Warning::
https://www.unesco.org/en: 594ms CPU time
Warning::
https://www.unesco.org/sites/default/files/js/js_K...: 378ms CPU time
Warning::
Third-party scripts: 6443ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Other 12% Style & Layout 10% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.unesco.org/TSPD/080713870fab2000d8d2dc88833d1464c8d2ca5a0467c4bc487c59c72e5eafb2214140177e3bc928?type=83135ms3042ms27ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T9NW&gtm_auth=_Lm02Fa-1lLDW1vNzj8zTg&gtm_preview=env-2&gtm_cookies_win=x605ms368ms46ms3rd
Unattributable599ms22ms0ms3rd
https://www.unesco.org/en594ms17ms3ms3rd
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-8hnj7cVMweIF3TKfQMeZ0DbhfR4HWZay8SbwALsE5DA378ms189ms67ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0NXZYG9QXM&cx=c&gtm=4e64f0358ms276ms50ms3rd
https://www.googletagmanager.com/gtag/js?id=G-E1YT8ZEB8P347ms282ms63ms3rd
https://tag.aticdn.net/js-sdk/piano-analytics-6.16.4.js197ms157ms16ms3rd
https://www.unesco.org/sites/default/files/css/css_3kqF62EnYgkIMtbtEXGzsoUL0s1gPPmXJh1GkDo2GJk.css?delta=3&language=en&theme=unesco&include=eJxdjcEKAyEMRH_Irqd-T0k0uNJoJKOU7dd3oYctvc3MG3hsNjGdxj0yQQJfvagx6Q3z0NrLL2kCUBGEpAQcsVuWkMzlTN5I61vCIKdyvnfE7GuQbteyrT4Wa8UuOeDAlPa1ry5I9m9-Ca_xgKnHTFOcepFR01P8A4seSkQ91ms0ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-E1YT8ZEB8P&cx=c&gtm=4e64f083ms36ms47ms3rd

Showing top 10 of 11 scripts

F
JS Bundles
Action
10 scripts, 520 KB unused
FIX
10 scripts, 520 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 (41%)
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: 520 KB
520 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=4e64f0157 KB110 KB (70%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0NXZYG9QXM&cx=c&gtm=4e64f0157 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-E1YT8ZEB8P157 KB65 KB (41%)✓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 KB42 KB (54%)✓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
52 resources · 2.2 MB · 520 KB savings available
FIX
52 resources · 2.2 MB · 520 KB savings available
Warning::
Page weight 1.2 MB over 1MB target
Got: 2.2 MB Expected: ≤ 1 MB
Info::
~520 KB of savings available
Warning::
51 third-party resources (100% of weight)
Info::
1 resources over 200KB
52 resources · 2.2 MiB · 51 third-party 1.2 MiB over 1MB target
JavaScript 46% · 1.0 MiB
Font 26% · 604.7 KiB
Image 11% · 261.5 KiB
CSS 9% · 211.1 KiB
Document 7% · 148.8 KiB
Other 0% · 2.6 KiB

~520.2 KiB of savings available

Remove unused JavaScript: 520.2 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
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
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.
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.
22 images 253 KB
0 oversized -0 KB
4 legacy format
6 missing dimensions CLS risk

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

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+
Font Loading
6 fonts (605 KB)
PASS
6 fonts (605 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

605 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 4.0 s 5.0 s 6.0 s 7.0 s FCP 7.1 s LCP 7.5 shttps://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 — 98.5 KiB — 465 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 — 133.9 KiB — 319 ms — font-display: swaphttps://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 — 91.1 KiB — 411 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 — 98.8 KiB — 308 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= — 84.7 KiB — 349 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 — 97.8 KiB — 340 ms — font-display: swap
Inter-SemiBold.woff2 woff2 swap
Size 98 KB
Load time 465 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
MaterialIconsSharp.woff2 woff2 swap
Size 134 KB
Load time 319 ms
Start 2.5 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-Regular.woff2 woff2 swap
Size 91 KB
Load time 411 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
Inter-Bold.woff2 woff2 swap
Size 99 KB
Load time 308 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
unesco.ttf ttf swap
Size 85 KB
Load time 349 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Inter-Medium.woff2 woff2 swap
Size 98 KB
Load time 340 ms
Start 2.5 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)

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
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
52 requests over 4312ms
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 7.1 s LCP 7.5 shttps://unesco.org// https://unesco.org/ — 302 — 127 B — 684 ms — http/1.0https://www.unesco.org/www.unesco.org/ https://www.unesco.org/ — 302 — 129 B — 609 ms — http/1.0https://www.unesco.org/enwww.unesco.org/en https://www.unesco.org/en — 200 — 140.8 KiB — 607 ms — 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 — 2.2 KiB — 454 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 — 87.6 KiB — 912 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 — 116.3 KiB — 930 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 — 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https://www.google-analytics.com/g/collect?v=2&tid=G-0NXZYG9QXM&gtm=45je64f0v9169819477za200zb6112160zd6112160&_p=1776362185553&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=385518813.1776362187&frm=0&pscdl=noapi&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266400&sid=1776362187&sct=1&seg=0&dl=https%3A%2F%2Fwww.unesco.org%2Fen&dt=UNESCO%20%3A%20Building%20Peace%20through%20Education%2C%20Science%20and%20Culture%2C%20communication%20and%20information&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.page_website=UNESCO.org&ep.page_content_type=Homepage&ep.page_lang=English&ep.page_tags=information%20and%20communication%2Csocial%20and%20human%20sciences%2Cocean%2Cnatural%20sciences%2Cgender%20equality%2Cpriority%20africa%2Ceducation%2Cculture%2Cpromote%20inclusion%20%EF%BC%86%20mutual%20understanding%2Cmobilize%20education%20to%20transform%20lives%2Cfoster%20science%20%EF%BC%86%20innovation%20for%20humanity%2Creconcile%20with%20nature%2Crespond%20to%20crises%20(emergency%2C%20post%20conflict%E2%80%A6)%2Cbuild%20a%20stronger%20multilateralism%20(un%2C%20g20%2C%20partnerships%E2%80%A6)%2Crespond%20to%20current%20global%20challenges%20(ai%2C%20climate%20change%20biodiversity%E2%80%A6)%2Ccovid-19%2Cwar%20in%20ukraine%2Cdata%2Cguidelines%20and%20tools%2Clists%20and%20designations%2Cnorms%20%EF%BC%86%20standards%2Cpolicy%20advice%2Cprogramme%20implementation%2Csharing%20knowledge%2Cun%20%EF%BC%86%20international%20cooperation&epn.page_tags_chars=625&ep.page_tags_truncated=truncated&tfd=2958 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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 6443ms · 1273KB · €70/mo
www.unesco.org
Other
Costly
Execution 3135ms
Transfer 86 KB
Monthly Cost €34/mo
Google Tag Manager
Tag Manager
Costly
Execution 605ms
Transfer 130 KB
Unused 47%
Monthly Cost €7/mo
Unattributable
Other
Costly
Execution 599ms
Transfer 0 KB
Monthly Cost €7/mo
www.unesco.org
Other
Costly
Execution 594ms
Transfer 141 KB
Monthly Cost €6/mo
www.unesco.org
Other
Costly
Execution 378ms
Transfer 224 KB
Unused 79%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 358ms
Transfer 157 KB
Unused 42%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 347ms
Transfer 157 KB
Unused 41%
Monthly Cost €4/mo
tag.aticdn.net
Other
Optional
Execution 197ms
Transfer 27 KB
Monthly Cost €2/mo
www.unesco.org
Other
Optional
Execution 91ms
Transfer 116 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 157 KB
Unused 70%
Monthly Cost €1/mo
www.unesco.org
Other
Optional
Execution 55ms
Transfer 78 KB
Unused 54%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.unesco.org adds 3135ms and costs ~€34/month
  • Google Tag Manager adds 605ms and costs ~€7/month
  • Unattributable adds 599ms and costs ~€7/month
  • www.unesco.org adds 594ms and costs ~€6/month
  • www.unesco.org adds 378ms and costs ~€4/month
  • Google Tag Manager adds 358ms and costs ~€4/month
  • Google Tag Manager adds 347ms 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.unesco.org takes 3135ms 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

Google Tag Manager takes 605ms 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 599ms 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 594ms 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 378ms 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

Google Tag Manager takes 358ms 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

Google Tag Manager takes 347ms 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

70% of Google Tag Manager'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

54% 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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