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https://brookings.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
54
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.

1.48 s

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

2.24 s

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

701 ms

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

0.050

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

2.04 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.

3.94 s

Page Load Progression

704 ms
1.4 s
2.1 s
2.8 s
3.5 s
4.2 s
4.9 s
5.6 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.8 MB transferred, 91 requests
FIX
3.8 MB transferred, 91 requests
Warning::
Page weighs 30.6 MB (3.8 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Info::
CSS is 208 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 208 KB
Info::
91 HTTP requests
Info::
Estimated 0.79 g CO2 per page load
3.8 MB / 2.4 MB budget
3.8 MB transferred
91 requests
0.79 g CO2 per page load
JavaScript 1.7 MiB 46%
Images 1.6 MiB 43%
CSS 207.7 KiB 5%
Fonts 164.5 KiB 4%
HTML 58.5 KiB 2%
Other 2.4 KiB 0%
Other 1.2 KiB 0%
Other 652 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

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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 (3.8 MiB of 3.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3335ms total JS execution
FIX
3335ms total JS execution
Warning::
https://www.brookings.edu/: 1299ms CPU time
Warning::
https://www.brookings.edu/wp-content/themes/brooki...: 548ms CPU time
Warning::
Unattributable: 395ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 264ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WHW...: 212ms CPU time
Warning::
Third-party scripts: 3335ms (100% of total)

Main Thread Breakdown

Other 46% Script Evaluation 27% Parse HTML & CSS 14% Style & Layout 7% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.brookings.edu/1299ms17ms2ms3rd
https://www.brookings.edu/wp-content/themes/brookings/assets/styles/public.css?ver=1775776928548ms0ms0ms3rd
Unattributable395ms6ms0ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js264ms224ms31ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHWFZ5212ms168ms18ms3rd
https://cmp.osano.com/16CY1DUX9sNbY3wXk/aff9cc08-c2dc-4e4d-862b-bfc6fb4f9403/osano.js196ms128ms10ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-993291021&cx=c&gtm=4e64h1h1131ms117ms12ms3rd
https://cdn.jsdelivr.net/npm/uikit@3.15.1/dist/js/uikit.min.js?ver=3.15.19130ms45ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PQL1XY12X1&cx=c&gtm=4e64h1h185ms64ms19ms3rd
https://www.googletagmanager.com/gtag/js?id=G-SHM2JLLVDB&cx=c&gtm=4e64h1h175ms60ms14ms3rd
F
JS Bundles
Action
23 scripts, 945 KB unused
FIX
23 scripts, 945 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://www.googletagmanager.com/gtag/destination?...: 66 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PQL1...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 945 KB
945 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://www.googletagmanager.com/gtag/destination?id=AW-993291021&cx=c&gtm=4e64h1h1144 KB66 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-PQL1XY12X1&cx=c&gtm=4e64h1h1158 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-SHM2JLLVDB&cx=c&gtm=4e64h1h1157 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHWFZ5174 KB61 KB (35%)✓3rd
https://www.brookings.edu/_static/??-eJyVzMENgzAMRuGFGiwk1MABsQMbAP1pHYgT2UFInZ52BE7v9D06s1uSFEih8kGE0awpbSxvo8kMxcgW5fzvyRnq5kNeO6rIUgV70I0BrzpFjDD+Qn94iH3tfd365tm14QKifjPr54 KB51 KB (94%)✗3rd
https://www.brookings.edu/wp-content/themes/brookings/assets/scripts/public.js?ver=177577596560 KB49 KB (82%)✓3rd
https://cdn.jsdelivr.net/npm/uikit@3.15.1/dist/js/uikit.min.js?ver=3.15.1947 KB31 KB (67%)✓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
91 resources · 3.8 MB · 945 KB savings available
FIX
91 resources · 3.8 MB · 945 KB savings available
Warning::
Page weight 2.8 MB over 1MB target
Got: 3.8 MB Expected: ≤ 1 MB
Info::
~945 KB of savings available
Warning::
90 third-party resources (100% of weight)
Info::
3 resources over 200KB
91 resources · 3.8 MiB · 90 third-party 2.8 MiB over 1MB target
JavaScript 46% · 1.7 MiB
Image 43% · 1.6 MiB
CSS 5% · 207.7 KiB
Font 4% · 164.5 KiB
Document 2% · 58.7 KiB
Other 0% · 1.8 KiB

~945.4 KiB of savings available

Remove unused JavaScript: 945.4 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.

B
Image Optimization
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Info::
All images are well-optimized
46 images 1.6 MB
0 oversized -0 KB
20 legacy format
0 missing dimensions CLS risk
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
3 fonts (165 KB)
PASS
3 fonts (165 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

165 KB total

Render-blocking

0

of 3

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 1.5 s LCP 2.2 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 10 ms — font-display: swaphttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa25L7W0Q5n-wU.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa25L7W0Q5n-wU.woff2 — 83.3 KiB — 11 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 26 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 10 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 83 KB
Load time 11 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 26 ms
Start 3.3 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
Network Waterfall
91 requests over 3778ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.5 s LCP 2.2 shttps://brookings.edu// https://brookings.edu/ — 302 — 211 B — 164 ms — http/1.1http://www.brookings.edu/www.brookings.edu/ http://www.brookings.edu/ — 307 — 0 B — 2 ms — http/1.1https://www.brookings.edu/www.brookings.edu/ https://www.brookings.edu/ — 200 — 31.1 KiB — 39 ms — h2https://www.brookings.edu/wp-content/plugins/wp-smartcrop/css/image-renderer.css?m=1771874698gwww.brookings.edu/wp-content/plugin... https://www.brookings.edu/wp-content/plugins/wp-smartcrop/css/image-renderer.css?m=1771874698g — 200 — 431 B — 20 ms — h2https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Newsreader:ital,opsz@0,6..72;1,6..72&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=Newsreader:ital,opsz@0,6..72;1,6..72&display=swap — 200 — 1.3 KiB — 63 ms — h2https://cdn.jsdelivr.net/npm/swiper@8/swiper-bundle.min.css?ver=1.0.0cdn.jsdelivr.net/npm/swiper@8/swipe... https://cdn.jsdelivr.net/npm/swiper@8/swiper-bundle.min.css?ver=1.0.0 — 200 — 4.9 KiB — 48 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/styles/photoswipe.css?m=1771874698gwww.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/styles/photoswipe.css?m=1771874698g — 200 — 2.3 KiB — 21 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/styles/public.css?ver=1775776928www.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/styles/public.css?ver=1775776928 — 200 — 151.2 KiB — 110 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/styles/app.css?ver=1771874698www.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/styles/app.css?ver=1771874698 — 200 — 5.0 KiB — 51 ms — h2https://www.brookings.edu/wp-content/plugins/wp-search-with-algolia/css/algolia-autocomplete.css?m=1771874698gwww.brookings.edu/wp-content/plugin... https://www.brookings.edu/wp-content/plugins/wp-search-with-algolia/css/algolia-autocomplete.css?m=1771874698g — 200 — 948 B — 57 ms — h2https://www.brookings.edu/_static/??-eJzTLy/QzcxLzilNSS3WzwKiwtLUokoopZebmaeXVayjj0+Rbm5melFiSSpUsX2uraG5uYmZkZmFhVkWAK/BIi8=www.brookings.edu/_static/??-eJzTLy... https://www.brookings.edu/_static/??-eJzTLy/QzcxLzilNSS3WzwKiwtLUokoopZebmaeXVayjj0+Rbm5melFiSSpUsX2uraG5uYmZkZmFhVkWAK/BIi8= — 200 — 34.6 KiB — 75 ms — h2https://cdn.jsdelivr.net/npm/uikit@3.15.1/dist/js/uikit.min.js?ver=3.15.19cdn.jsdelivr.net/npm/uikit@3.15.1/d... https://cdn.jsdelivr.net/npm/uikit@3.15.1/dist/js/uikit.min.js?ver=3.15.19 — 200 — 47.2 KiB — 75 ms — h2https://cdn.jsdelivr.net/npm/uikit@3.15.1/dist/js/uikit-icons.min.js?ver=3.15.19cdn.jsdelivr.net/npm/uikit@3.15.1/d... https://cdn.jsdelivr.net/npm/uikit@3.15.1/dist/js/uikit-icons.min.js?ver=3.15.19 — 200 — 17.6 KiB — 54 ms — h2https://www.brookings.edu/_static/??-eJyVzMENgzAMRuGFGiwk1MABsQMbAP1pHYgT2UFInZ52BE7v9D06s1uSFEih8kGE0awpbSxvo8kMxcgW5fzvyRnq5kNeO6rIUgV70I0BrzpFjDD+Qn94iH3tfd365tm14QKifjPrwww.brookings.edu/_static/??-eJyVzM... https://www.brookings.edu/_static/??-eJyVzMENgzAMRuGFGiwk1MABsQMbAP1pHYgT2UFInZ52BE7v9D06s1uSFEih8kGE0awpbSxvo8kMxcgW5fzvyRnq5kNeO6rIUgV70I0BrzpFjDD+Qn94iH3tfd365tm14QKifjPr — 200 — 53.8 KiB — 82 ms — h2https://www.google.com/recaptcha/api.js?render=6LeD2NEmAAAAACNmfMOrpMwIrt4cV7pz9JO_HRXf&ver=1.0.0www.google.com/recaptcha/api.js?ren... https://www.google.com/recaptcha/api.js?render=6LeD2NEmAAAAACNmfMOrpMwIrt4cV7pz9JO_HRXf&ver=1.0.0 — 200 — 1.0 KiB — 73 ms — h3https://www.brookings.edu/_static/??-eJydzDsOgCAMANALCQ2JER2MZ/HTSFUosTV4fB2dnd72oGQzc1JMChowosB0Mu+UVoFRBFVA5pPyaw6sLIUymoPWoBPf9oqLjZTsJhX8qj7DEHvnvWt93XTt9gARQDnewww.brookings.edu/_static/??-eJydzD... https://www.brookings.edu/_static/??-eJydzDsOgCAMANALCQ2JER2MZ/HTSFUosTV4fB2dnd72oGQzc1JMChowosB0Mu+UVoFRBFVA5pPyaw6sLIUymoPWoBPf9oqLjZTsJhX8qj7DEHvnvWt93XTt9gARQDne — 200 — 18.2 KiB — 64 ms — h2https://cmp.osano.com/16CY1DUX9sNbY3wXk/aff9cc08-c2dc-4e4d-862b-bfc6fb4f9403/osano.jscmp.osano.com/16CY1DUX9sNbY3wXk/aff... https://cmp.osano.com/16CY1DUX9sNbY3wXk/aff9cc08-c2dc-4e4d-862b-bfc6fb4f9403/osano.js — 200 — 101.0 KiB — 81 ms — h2https://experiments.parsely.com/vip-experiments.js?apiKey=brookings.eduexperiments.parsely.com/vip-experim... https://experiments.parsely.com/vip-experiments.js?apiKey=brookings.edu — 200 — 8.9 KiB — 35 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-business-and-workforce.svgwww.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-business-and-workforce.svg — 200 — 1.4 KiB — 54 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-cities-and-communities.svgwww.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-cities-and-communities.svg — 200 — 864 B — 55 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-climate-and-energy.svgwww.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-climate-and-energy.svg — 200 — 1012 B — 21 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-defense-and-security.svgwww.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-defense-and-security.svg — 200 — 618 B — 22 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-education.svgwww.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/svg/icons/topic/icon-topic-education.svg — 200 — 625 B — 15 ms — h2https://www.brookings.edu/_static/??-eJyVjEEKwzAMBD9UWwRKnR5K3+IYkdiNZVVSEvr7+phrTgvDzsDBLjUyJANetzmTQkdao1iSxlAUyndD+fkz9jWTL3qDk24LVlSYpLVPplkhqqIpaJLMfSPzVWXNOzrc+9VNkQilB971NYQwjOH+eI7lD8g1R/E=www.brookings.edu/_static/??-eJyVjE... https://www.brookings.edu/_static/??-eJyVjEEKwzAMBD9UWwRKnR5K3+IYkdiNZVVSEvr7+phrTgvDzsDBLjUyJANetzmTQkdao1iSxlAUyndD+fkz9jWTL3qDk24LVlSYpLVPplkhqqIpaJLMfSPzVWXNOzrc+9VNkQilB971NYQwjOH+eI7lD8g1R/E= — 200 — 9.0 KiB — 12 ms — h2https://www.brookings.edu/wp-content/themes/brookings/assets/scripts/public.js?ver=1775775965www.brookings.edu/wp-content/themes... https://www.brookings.edu/wp-content/themes/brookings/assets/scripts/public.js?ver=1775775965 — 200 — 59.6 KiB — 12 ms — 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51 ms — h2https://www.googletagmanager.com/gtag/destination?id=AW-993291021&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/desti... https://www.googletagmanager.com/gtag/destination?id=AW-993291021&cx=c&gtm=4e64h1h1 — 200 — 144.4 KiB — 59 ms — h3https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4www.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 — 200 — 23 B — 258 ms — h3https://www.gstatic.com/recaptcha/api2/logo_48.pngwww.gstatic.com/recaptcha/api2/logo... https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.3 KiB — 7 ms — h2https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 33.9 KiB — 26 ms — 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— 204 — 48 B — 29 ms — h2
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 3335ms · 964KB · $44/mo
www.brookings.edu
Other
Costly
Execution 1299ms
Transfer 31 KB
Monthly Cost $17/mo
www.brookings.edu
Other
Costly
Execution 548ms
Transfer 151 KB
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 395ms
Transfer 0 KB
Monthly Cost $5/mo
www.gstatic.com
Other
Costly
Execution 264ms
Transfer 0 KB
Unused 49%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 212ms
Transfer 174 KB
Unused 35%
Monthly Cost $3/mo
cmp.osano.com
Other
Optional
Execution 196ms
Transfer 101 KB
Unused 26%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 131ms
Transfer 144 KB
Unused 46%
Monthly Cost $2/mo
jsDelivr
CDN
Optional
Execution 130ms
Transfer 47 KB
Unused 67%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 158 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 75ms
Transfer 157 KB
Unused 41%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.brookings.edu adds 1299ms and costs ~$17/month
  • www.brookings.edu adds 548ms and costs ~$7/month
  • Unattributable adds 395ms and costs ~$5/month
  • www.gstatic.com adds 264ms and costs ~$4/month
  • Google Tag Manager adds 212ms and costs ~$3/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.brookings.edu takes 1299ms 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.brookings.edu takes 548ms 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 395ms 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.gstatic.com takes 264ms 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 212ms 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

67% of jsDelivr'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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