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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
0
REVIEW
7
PASS
8
INFO
2

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

Mobile Desktop
68
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.

1.10 s

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

7.02 s

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

359 ms

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

0.009

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

1.90 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.

7.39 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
17
8 PASS 7 REVIEW
B
Page Weight Budget
1.4 MB transferred, 29 requests
REVIEW
1.4 MB transferred, 29 requests
Info::
Page weighs 2.6 MB (1.4 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::
29 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
29 requests
0.30 g CO2 per page load
Images 669.0 KiB 46%
JavaScript 398.1 KiB 27%
Fonts 287.8 KiB 20%
Other 54.5 KiB 4%
CSS 35.4 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
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://unu.edu/images/unu-logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 669 KB
0 oversized -0 KB
8 legacy format
1 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

C
JS Execution Cost
Action
1806ms total JS execution
REVIEW
1806ms total JS execution
Warning::
Unattributable: 464ms CPU time
Warning::
https://unu.edu/sites/default/files/js/js_QbODuQaG...: 423ms CPU time
Warning::
https://unu.edu/: 356ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-GC1S...: 276ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KP2...: 162ms CPU time
Info::
Third-party scripts: 903ms (50% of total)

Main Thread Breakdown

Script Evaluation 42% Other 30% Style & Layout 13% Script Parsing & Compilation 7% Rendering 5%
ScriptTotalScriptingParse/CompileParty
Unattributable464ms106ms0ms3rd
https://unu.edu/sites/default/files/js/js_QbODuQaGRBImpISr7idPg8OdwJg0_8zlrRMtRayk8sc.js?scope=footer&delta=0&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE423ms226ms18ms1st
https://unu.edu/356ms10ms2ms1st
https://www.googletagmanager.com/gtag/js?id=G-GC1S5HMCRM&cx=c&gtm=4e64k0276ms220ms54ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KP2GRX2162ms127ms34ms3rd
https://unu.edu/sites/default/files/js/js_RCxOTs6M_YM8OYpDt-aK-e33bWFRc8uEnEwIWDHc55U.js?scope=footer&delta=3&language=en&theme=unu&include=eJxtyEEOgCAMBMAPaXhSg7BoY20JLf9X7p4mGUwqZjfj4-nCWQsSfnKbOtMpdmTZvQzu4avIrzxQqQ3TgNa0jlVYQc0s1AL-AgnrKKE124ms78ms17ms1st
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
29 resources · 1.4 MB · 204 KB savings available
REVIEW
29 resources · 1.4 MB · 204 KB savings available
Warning::
Page weight 434 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~204 KB of savings available
Info::
5 third-party resources (19% of weight)
Info::
1 resources over 200KB
29 resources · 1.4 MiB · 5 third-party 433.8 KiB over 1MB target
Image 50% · 723.6 KiB
JavaScript 27% · 398.1 KiB
Font 20% · 287.8 KiB
CSS 2% · 35.4 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 1.4 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+
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.1 s LCP 7.0 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 — 37.2 KiB — 57 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 — 36.3 KiB — 65 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 — 36.1 KiB — 28 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 — 36.5 KiB — 29 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 — 67 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 — 36.0 KiB — 50 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 — 34.5 KiB — 60 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 — 33.9 KiB — 50 ms — font-display: swap
national-2-bold-italic.... woff2 swap
Size 37 KB
Load time 57 ms
Start 161 ms
Risk FOUT — text flashes from fallback to web font
national-2-bold.woff2 woff2 swap
Size 36 KB
Load time 65 ms
Start 161 ms
Risk FOUT — text flashes from fallback to web font
national-2-light-italic... woff2 swap
Size 36 KB
Load time 28 ms
Start 161 ms
Risk FOUT — text flashes from fallback to web font
national-2-light.woff2 woff2 swap
Size 36 KB
Load time 29 ms
Start 162 ms
Risk FOUT — text flashes from fallback to web font
national-2-medium-itali... woff2 swap
Size 37 KB
Load time 67 ms
Start 162 ms
Risk FOUT — text flashes from fallback to web font
national-2-medium.woff2 woff2 swap
Size 36 KB
Load time 50 ms
Start 162 ms
Risk FOUT — text flashes from fallback to web font
national-2-regular-ital... woff2 swap
Size 34 KB
Load time 60 ms
Start 163 ms
Risk FOUT — text flashes from fallback to web font
national-2-regular.woff2 woff2 swap
Size 34 KB
Load time 50 ms
Start 163 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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
—
preload
8
dns-prefetch
—
prefetch
—

8 resource hints configured

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
29 requests over 701ms
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 1.1 s LCP 7.0 shttps://unu.edu// https://unu.edu/ — 200 — 12.5 KiB — 143 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 — 37.2 KiB — 57 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 — 36.3 KiB — 65 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 — 36.1 KiB — 28 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 — 36.5 KiB — 29 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 — 67 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 — 36.0 KiB — 50 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 — 34.5 KiB — 60 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 — 33.9 KiB — 50 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 — 3.2 KiB — 36 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 — 22 ms — h2https://unu.edu/images/unu-logo.svg/images/unu-logo.svg https://unu.edu/images/unu-logo.svg — 200 — 15.4 KiB — 54 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 — 83 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 — 31.2 KiB — 84 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 — 21.2 KiB — 89 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 — 65.0 KiB — 51 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 — 1002 B — 51 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 — 47 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 — 51 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 — 87 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 — 29.8 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 — 36.8 KiB — 78 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... 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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
50% of JavaScript execution is third-party
First-party Third-party 903ms · 277KB · €10/mo
Unattributable
Other
Costly
Execution 464ms
Transfer 0 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 276ms
Transfer 160 KB
Unused 40%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 162ms
Transfer 117 KB
Unused 55%
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 464ms and costs ~€5/month
  • Google Tag Manager adds 276ms and costs ~€3/month

50% 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

Unattributable takes 464ms 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 276ms 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 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

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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