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https://unu.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
0
REVIEW
6
PASS
7
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.

308 ms

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

1.43 s

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

11 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.

618 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.44 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
7 PASS 6 REVIEW
B
Page Weight Budget
1.5 MB transferred, 30 requests
REVIEW
1.5 MB transferred, 30 requests
Info::
Page weighs 2.6 MB (1.5 MB transferred)
Info::
Fonts are 288 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 288 KB
Info::
30 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
30 requests
0.31 g CO2 per page load
Images 710.0 KiB 47%
JavaScript 398.1 KiB 27%
Fonts 287.8 KiB 19%
Other 54.4 KiB 4%
CSS 35.3 KiB 2%
HTML 12.5 KiB 1%
Other 543 B 0%
0 2.4 MB 4.9 MB
Under budget

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

B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 710 KB
0 oversized -0 KB
8 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
6 scripts, 204 KB unused
REVIEW
6 scripts, 204 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-GC1S...: 65 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KP2...: 64 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://unu.edu/sites/default/files/js/js_QbODuQaG...: 42 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://unu.edu/sites/default/files/js/js_RCxOTs6M...: 33 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 204 KB
204 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-GC1S5HMCRM&cx=c&gtm=4e64k0160 KB65 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KP2GRX2117 KB64 KB (55%)✓3rd
https://unu.edu/sites/default/files/js/js_QbODuQaGRBImpISr7idPg8OdwJg0_8zlrRMtRayk8sc.js?scope=footer&delta=0&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE65 KB42 KB (65%)✓1st
https://unu.edu/sites/default/files/js/js_RCxOTs6M_YM8OYpDt-aK-e33bWFRc8uEnEwIWDHc55U.js?scope=footer&delta=3&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE54 KB33 KB (62%)✓1st
https://cdnjs.cloudflare.com/ajax/libs/jquery-throttle-debounce/1.1/jquery.ba-throttle-debounce.min.js1 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/svg4everybody/2.1.9/svg4everybody.min.js1 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

C
Page Weight Inventory
Action
30 resources · 1.5 MB · 204 KB savings available
REVIEW
30 resources · 1.5 MB · 204 KB savings available
Warning::
Page weight 475 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~204 KB of savings available
Info::
5 third-party resources (19% of weight)
Info::
1 resources over 200KB
30 resources · 1.5 MiB · 5 third-party 474.6 KiB over 1MB target
Image 51% · 764.4 KiB
JavaScript 27% · 398.1 KiB
Font 19% · 287.8 KiB
CSS 2% · 35.3 KiB
Document 1% · 12.5 KiB
Other 0% · 543 B

~203.8 KiB of savings available

Remove unused JavaScript: 203.8 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
must-revalidate, no-cache, private
REVIEW
must-revalidate, no-cache, private
Info::
Cache-Control header is set
Got: must-revalidate, no-cache, private
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

must-revalidate, no-cache, private

DirectiveValueMeaning
must-revalidate—Must recheck with server after expiry
no-cache—Cache but always revalidate first
private—Only browser cache, not CDN/proxy
A+
Third-Party Impact
19% third-party, 0 ms blocking
PASS
19% third-party, 0 ms blocking
Info::
Third-party code accounts for 19% of page weight (279.9 KiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
81%
19%
First-party Third-party
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
396ms total JS execution
PASS
396ms total JS execution
Info::
Unattributable: 153ms CPU time
Info::
https://unu.edu/sites/default/files/js/js_QbODuQaG...: 91ms CPU time
Info::
https://unu.edu/: 88ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-GC1S...: 64ms CPU time
Warning::
Third-party scripts: 217ms (55% of total)

Main Thread Breakdown

Script Evaluation 39% Other 30% Style & Layout 14% Script Parsing & Compilation 7% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable153ms33ms0ms3rd
https://unu.edu/sites/default/files/js/js_QbODuQaGRBImpISr7idPg8OdwJg0_8zlrRMtRayk8sc.js?scope=footer&delta=0&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE91ms47ms5ms1st
https://unu.edu/88ms3ms3ms1st
https://www.googletagmanager.com/gtag/js?id=G-GC1S5HMCRM&cx=c&gtm=4e64k064ms50ms13ms3rd
A+
Font Loading
8 fonts (288 KB)
PASS
8 fonts (288 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

288 KB total

Render-blocking

0

of 8

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 FCP 308 ms LCP 1.4 shttps://unu.edu/themes/custom/fonts/national-2-bold-italic.woff2national-2-bold-italic.... https://unu.edu/themes/custom/fonts/national-2-bold-italic.woff2 — 37.3 KiB — 32 ms — font-display: swaphttps://unu.edu/themes/custom/fonts/national-2-bold.woff2national-2-bold.woff2 https://unu.edu/themes/custom/fonts/national-2-bold.woff2 — 36.2 KiB — 40 ms — font-display: swaphttps://unu.edu/themes/custom/fonts/national-2-light-italic.woff2national-2-light-italic... https://unu.edu/themes/custom/fonts/national-2-light-italic.woff2 — 36.2 KiB — 23 ms — font-display: swaphttps://unu.edu/themes/custom/fonts/national-2-light.woff2national-2-light.woff2 https://unu.edu/themes/custom/fonts/national-2-light.woff2 — 36.6 KiB — 40 ms — font-display: swaphttps://unu.edu/themes/custom/fonts/national-2-medium-italic.woff2national-2-medium-itali... https://unu.edu/themes/custom/fonts/national-2-medium-italic.woff2 — 37.3 KiB — 43 ms — font-display: swaphttps://unu.edu/themes/custom/fonts/national-2-medium.woff2national-2-medium.woff2 https://unu.edu/themes/custom/fonts/national-2-medium.woff2 — 36.1 KiB — 40 ms — font-display: swaphttps://unu.edu/themes/custom/fonts/national-2-regular-italic.woff2national-2-regular-ital... https://unu.edu/themes/custom/fonts/national-2-regular-italic.woff2 — 34.4 KiB — 26 ms — font-display: swaphttps://unu.edu/themes/custom/fonts/national-2-regular.woff2national-2-regular.woff2 https://unu.edu/themes/custom/fonts/national-2-regular.woff2 — 33.7 KiB — 40 ms — font-display: swap
national-2-bold-italic.... woff2 swap
Size 37 KB
Load time 32 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
national-2-bold.woff2 woff2 swap
Size 36 KB
Load time 40 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
national-2-light-italic... woff2 swap
Size 36 KB
Load time 23 ms
Start 173 ms
Risk FOUT — text flashes from fallback to web font
national-2-light.woff2 woff2 swap
Size 37 KB
Load time 40 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
national-2-medium-itali... woff2 swap
Size 37 KB
Load time 43 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
national-2-medium.woff2 woff2 swap
Size 36 KB
Load time 40 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
national-2-regular-ital... woff2 swap
Size 34 KB
Load time 26 ms
Start 174 ms
Risk FOUT — text flashes from fallback to web font
national-2-regular.woff2 woff2 swap
Size 34 KB
Load time 40 ms
Start 175 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
30 requests over 720ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 308 ms LCP 1.4 shttps://unu.edu// https://unu.edu/ — 200 — 12.5 KiB — 161 ms — h2https://unu.edu/themes/custom/fonts/national-2-bold-italic.woff2/themes/custom/fonts/national-2-bol... https://unu.edu/themes/custom/fonts/national-2-bold-italic.woff2 — 200 — 37.3 KiB — 32 ms — h2https://unu.edu/themes/custom/fonts/national-2-bold.woff2/themes/custom/fonts/national-2-bol... https://unu.edu/themes/custom/fonts/national-2-bold.woff2 — 200 — 36.2 KiB — 40 ms — h2https://unu.edu/themes/custom/fonts/national-2-light-italic.woff2/themes/custom/fonts/national-2-lig... https://unu.edu/themes/custom/fonts/national-2-light-italic.woff2 — 200 — 36.2 KiB — 23 ms — h2https://unu.edu/themes/custom/fonts/national-2-light.woff2/themes/custom/fonts/national-2-lig... https://unu.edu/themes/custom/fonts/national-2-light.woff2 — 200 — 36.6 KiB — 40 ms — h2https://unu.edu/themes/custom/fonts/national-2-medium-italic.woff2/themes/custom/fonts/national-2-med... https://unu.edu/themes/custom/fonts/national-2-medium-italic.woff2 — 200 — 37.3 KiB — 43 ms — h2https://unu.edu/themes/custom/fonts/national-2-medium.woff2/themes/custom/fonts/national-2-med... https://unu.edu/themes/custom/fonts/national-2-medium.woff2 — 200 — 36.1 KiB — 40 ms — h2https://unu.edu/themes/custom/fonts/national-2-regular-italic.woff2/themes/custom/fonts/national-2-reg... https://unu.edu/themes/custom/fonts/national-2-regular-italic.woff2 — 200 — 34.4 KiB — 26 ms — h2https://unu.edu/themes/custom/fonts/national-2-regular.woff2/themes/custom/fonts/national-2-reg... https://unu.edu/themes/custom/fonts/national-2-regular.woff2 — 200 — 33.7 KiB — 40 ms — h2https://unu.edu/sites/default/files/css/css_p6zh2ElL48HRCSWrk-7JaVegceDhIFKKNuGsXCsLj5k.css?delta=0&language=en&theme=unu&include=eJxtzEsKAjEQRdENxc6SmpfkmY5WPqRSYLt6BREnji6cwY0C1dNXqiJTXeyTPk0bkA03PD7Q-qyQ8qSj7bH3e-E7dUhBi_T_cE-8wmS5gYk8MQ79fn-yWRsWpOjB5PTUxeoDlM6a-Sw9QC66TiktvwAE3UJt/sites/default/files/css/css_p6zh2E... https://unu.edu/sites/default/files/css/css_p6zh2ElL48HRCSWrk-7JaVegceDhIFKKNuGsXCsLj5k.css?delta=0&language=en&theme=unu&include=eJxtzEsKAjEQRdENxc6SmpfkmY5WPqRSYLt6BREnji6cwY0C1dNXqiJTXeyTPk0bkA03PD7Q-qyQ8qSj7bH3e-E7dUhBi_T_cE-8wmS5gYk8MQ79fn-yWRsWpOjB5PTUxeoDlM6a-Sw9QC66TiktvwAE3UJt — 200 — 3.1 KiB — 25 ms — h2https://unu.edu/sites/default/files/css/css_En0jhNeXBQeP-cY_1PSIMhM5qXk-KhrQ5l3uw4Ddx0M.css?delta=1&language=en&theme=unu&include=eJxtzEsKAjEQRdENxc6SmpfkmY5WPqRSYLt6BREnji6cwY0C1dNXqiJTXeyTPk0bkA03PD7Q-qyQ8qSj7bH3e-E7dUhBi_T_cE-8wmS5gYk8MQ79fn-yWRsWpOjB5PTUxeoDlM6a-Sw9QC66TiktvwAE3UJt/sites/default/files/css/css_En0jhN... https://unu.edu/sites/default/files/css/css_En0jhNeXBQeP-cY_1PSIMhM5qXk-KhrQ5l3uw4Ddx0M.css?delta=1&language=en&theme=unu&include=eJxtzEsKAjEQRdENxc6SmpfkmY5WPqRSYLt6BREnji6cwY0C1dNXqiJTXeyTPk0bkA03PD7Q-qyQ8qSj7bH3e-E7dUhBi_T_cE-8wmS5gYk8MQ79fn-yWRsWpOjB5PTUxeoDlM6a-Sw9QC66TiktvwAE3UJt — 200 — 32.2 KiB — 17 ms — h2https://unu.edu/images/unu-logo.svg/images/unu-logo.svg https://unu.edu/images/unu-logo.svg — 200 — 15.4 KiB — 38 ms — h2https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/Inline%20Media%20%E2%80%93%20Single%20Image%20944x531px%20-%202026-04-17T155713.677.png?itok=py9eARPV/sites/default/files/styles/card_vi... https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/Inline%20Media%20%E2%80%93%20Single%20Image%20944x531px%20-%202026-04-17T155713.677.png?itok=py9eARPV — 200 — 348.9 KiB — 85 ms — h2https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/UN7104342_77e_UNU-Centre.jpg?itok=_XWxDsww/sites/default/files/styles/card_vi... https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/UN7104342_77e_UNU-Centre.jpg?itok=_XWxDsww — 200 — 31.3 KiB — 72 ms — h2https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/0417%20web_0.jpg?itok=IYu5ycdq/sites/default/files/styles/card_vi... https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/0417%20web_0.jpg?itok=IYu5ycdq — 200 — 21.1 KiB — 78 ms — h2https://unu.edu/sites/default/files/js/js_QbODuQaGRBImpISr7idPg8OdwJg0_8zlrRMtRayk8sc.js?scope=footer&delta=0&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE/sites/default/files/js/js_QbODuQaG... https://unu.edu/sites/default/files/js/js_QbODuQaGRBImpISr7idPg8OdwJg0_8zlrRMtRayk8sc.js?scope=footer&delta=0&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE — 200 — 64.9 KiB — 23 ms — h2https://cdnjs.cloudflare.com/ajax/libs/jquery-throttle-debounce/1.1/jquery.ba-throttle-debounce.min.jscdnjs.cloudflare.com/ajax/libs/jque... https://cdnjs.cloudflare.com/ajax/libs/jquery-throttle-debounce/1.1/jquery.ba-throttle-debounce.min.js — 200 — 1004 B — 37 ms — h3https://cdnjs.cloudflare.com/ajax/libs/svg4everybody/2.1.9/svg4everybody.min.jscdnjs.cloudflare.com/ajax/libs/svg4... https://cdnjs.cloudflare.com/ajax/libs/svg4everybody/2.1.9/svg4everybody.min.js — 200 — 1.4 KiB — 34 ms — h3https://unu.edu/sites/default/files/js/js_RCxOTs6M_YM8OYpDt-aK-e33bWFRc8uEnEwIWDHc55U.js?scope=footer&delta=3&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE/sites/default/files/js/js_RCxOTs6M... https://unu.edu/sites/default/files/js/js_RCxOTs6M_YM8OYpDt-aK-e33bWFRc8uEnEwIWDHc55U.js?scope=footer&delta=3&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE — 200 — 53.7 KiB — 23 ms — h2https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/Romina-Picolotti-UNU_Centre.jpg?itok=LvVcyyBD/sites/default/files/styles/card_vi... https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/Romina-Picolotti-UNU_Centre.jpg?itok=LvVcyyBD — 200 — 23.2 KiB — 73 ms — h2https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/UN71134695.jpg?itok=7eeOJfgx/sites/default/files/styles/card_vi... https://unu.edu/sites/default/files/styles/card_view_big/public/2026-04/UN71134695.jpg?itok=7eeOJfgx — 200 — 29.9 KiB — 74 ms — h2https://unu.edu/sites/default/files/styles/card_view_big/public/2026-02/ClimateTech-in-Focus-2025-cover-graphic.jpg?itok=mOXHyQ2C/sites/default/files/styles/card_vi... https://unu.edu/sites/default/files/styles/card_view_big/public/2026-02/ClimateTech-in-Focus-2025-cover-graphic.jpg?itok=mOXHyQ2C — 200 — 36.7 KiB — 70 ms — h2https://unu.edu/sites/default/files/styles/card_view_big/public/2026-01/Screenshot%202026-01-14%20at%201.29.43%E2%80%AFPM.png?itok=ILsEcm92/sites/default/files/styles/card_vi... https://unu.edu/sites/default/files/styles/card_view_big/public/2026-01/Screenshot%202026-01-14%20at%201.29.43%E2%80%AFPM.png?itok=ILsEcm92 — 200 — 155.0 KiB — 78 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KP2GRX2www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KP2GRX2 — 200 — 117.1 KiB — 101 ms — h2https://unu.edu/images/symbol/sprite.symbol.svg/images/symbol/sprite.symbol.svg https://unu.edu/images/symbol/sprite.symbol.svg — 200 — 52.8 KiB — 19 ms — h2https://unu.edu/sites/default/files/styles/hero_banner_desktop/public/2025-01/UNUat50_WEB_HeroVisual_01.webp?h=3e43625b&itok=D-sULMz1/sites/default/files/styles/hero_ba... https://unu.edu/sites/default/files/styles/hero_banner_desktop/public/2025-01/UNUat50_WEB_HeroVisual_01.webp?h=3e43625b&itok=D-sULMz1 — 200 — 15.1 KiB — 66 ms — h2https://unu.edu/sites/default/files/styles/call_to_action_deskto/public/2025-07/DSC_8472_UNU-Centre.webp?h=56d0ca2e&itok=FEYCTh7D/sites/default/files/styles/call_to... https://unu.edu/sites/default/files/styles/call_to_action_deskto/public/2025-07/DSC_8472_UNU-Centre.webp?h=56d0ca2e&itok=FEYCTh7D — 200 — 33.4 KiB — 63 ms — h2https://www.googletagmanager.com/gtag/js?id=G-GC1S5HMCRM&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-GC1S5HMCRM&cx=c&gtm=4e64k0 — 200 — 159.8 KiB — 105 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-GC1S5HMCRM&gtm=45je64k0v9101716159z89101707263za20gzb9101707263zd9101707263&_p=1776890752454&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1751099994.1776890753&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266400~117512543~117884344&sid=1776890752&sct=1&seg=0&dl=https%3A%2F%2Funu.edu%2F&dt=UNU%20%7C%20United%20Nations%20University&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=663www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-GC1S5HMCRM&gtm=45je64k0v9101716159z89101707263za20gzb9101707263zd9101707263&_p=1776890752454&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1751099994.1776890753&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266400~117512543~117884344&sid=1776890752&sct=1&seg=0&dl=https%3A%2F%2Funu.edu%2F&dt=UNU%20%7C%20United%20Nations%20University&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=663 — 204 — 543 B — 56 ms — h2https://unu.edu/themes/custom/unu/favicon.ico/themes/custom/unu/favicon.ico https://unu.edu/themes/custom/unu/favicon.ico — 200 — 1.6 KiB — 13 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
55% of JavaScript execution is third-party
First-party Third-party 217ms · 160KB · €2/mo
Unattributable
Other
Optional
Execution 153ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 160 KB
Unused 40%
Monthly Cost €1/mo

55% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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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