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https://brookings.edu

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
30
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.

10.74 s

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

27.35 s

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

1.50 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.

10.74 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.

28.06 s

Page Load Progression

394 ms
788 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.1 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.7 MB transferred, 90 requests
FIX
5.7 MB transferred, 90 requests
Critical::
Page weighs 32.3 MB (5.7 MB transferred)
Warning::
Images are 3.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.6 MB
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
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::
90 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.7 MB / 2.4 MB budget
5.7 MB transferred
90 requests
1.2 g CO2 per page load
Images 3.6 MiB 62%
JavaScript 1.7 MiB 30%
CSS 208.5 KiB 4%
Fonts 164.5 KiB 3%
HTML 58.6 KiB 1%
Other 2.5 KiB 0%
Other 1.2 KiB 0%
Other 652 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (5.7 MiB of 5.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
8037ms total JS execution
FIX
8037ms total JS execution
Warning::
https://www.brookings.edu/wp-content/themes/brooki...: 2181ms CPU time
Warning::
Unattributable: 1170ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 974ms CPU time
Warning::
https://www.brookings.edu/: 909ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WHW...: 602ms CPU time
Warning::
Third-party scripts: 8037ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Parse HTML & CSS 25% Other 20% Style & Layout 8% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.brookings.edu/wp-content/themes/brookings/assets/styles/public.css?ver=17757769282181ms0ms0ms3rd
Unattributable1170ms11ms0ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js974ms828ms112ms3rd
https://www.brookings.edu/909ms60ms8ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WHWFZ5602ms492ms73ms3rd
https://cmp.osano.com/16CY1DUX9sNbY3wXk/aff9cc08-c2dc-4e4d-862b-bfc6fb4f9403/osano.js597ms484ms43ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-993291021&cx=c&gtm=4e64h1445ms381ms59ms3rd
https://cdn.jsdelivr.net/npm/uikit@3.15.1/dist/js/uikit.min.js?ver=3.15.19282ms103ms17ms3rd
https://www.googletagmanager.com/gtag/js?id=G-SHM2JLLVDB&cx=c&gtm=4e64h1279ms217ms58ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PQL1XY12X1&cx=c&gtm=4e64h1276ms218ms54ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
23 scripts, 946 KB unused
FIX
23 scripts, 946 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: 946 KB
946 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=4e64h1144 KB66 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-PQL1XY12X1&cx=c&gtm=4e64h1158 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-SHM2JLLVDB&cx=c&gtm=4e64h1157 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
90 resources · 5.7 MB · 946 KB savings available
FIX
90 resources · 5.7 MB · 946 KB savings available
Warning::
Page weight 4.7 MB over 1MB target
Got: 5.7 MB Expected: ≤ 1 MB
Info::
~946 KB of savings available
Warning::
89 third-party resources (100% of weight)
Info::
7 resources over 200KB
90 resources · 5.7 MiB · 89 third-party 4.7 MiB over 1MB target
Image 63% · 3.6 MiB
JavaScript 30% · 1.7 MiB
CSS 4% · 208.5 KiB
Font 3% · 164.5 KiB
Document 1% · 58.9 KiB
Other 0% · 1.8 KiB

~946.2 KiB of savings available

Remove unused JavaScript: 946.2 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.

B
Image Optimization
45 images, 0 KB saveable
REVIEW
45 images, 0 KB saveable
Info::
All images are well-optimized
45 images 3.6 MB
0 oversized -0 KB
19 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 10.7 s LCP 27.4 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 12 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 — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 20 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 12 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 83 KB
Load time 7 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 20 ms
Start 1.8 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
4
prefetch
—

4 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
90 requests over 2458ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 10.7 s LCP 27.4 shttps://brookings.edu// https://brookings.edu/ — 302 — 211 B — 78 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 — 44 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 — 19 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 — 58 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 — 5.2 KiB — 41 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 — 19 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 — 100 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 — 21 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 — 20 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 — 57 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 — 46.8 KiB — 62 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 — 17.7 KiB — 41 ms — h2https://www.brookings.edu/_static/??-eJyVzMENgzAMRuGFGiwk1MABsQMbAP1pHYgT2UFInZ52BE7v9D06s1uSFEih8kGE0awpbSxvo8kMxcgW5fzvyRnq5kNeO6rIUgV70I0BrzpFjDD+Qn94iH3tfd365tm14QKifjPrwww.brookings.edu/_static/??-eJyVzM... https://www.brookings.edu/_static/??-eJyVzMENgzAMRuGFGiwk1MABsQMbAP1pHYgT2UFInZ52BE7v9D06s1uSFEih8kGE0awpbSxvo8kMxcgW5fzvyRnq5kNeO6rIUgV70I0BrzpFjDD+Qn94iH3tfd365tm14QKifjPr — 200 — 53.8 KiB — 79 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 — 79 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 — 57 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 — 100.7 KiB — 222 ms — h3https://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 — 34 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 — 29 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 — 48 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 — 63 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 — 44 ms — 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https://www.google-analytics.com/g/collect?v=2&tid=G-PQL1XY12X1&gtm=45je64h1v875705919z872341590za20gzb72341590zd72341590&_p=1776799752981&gcs=G100&gcd=13p3p3p3p5l1&npa=1&dma_cps=-&dma=0&_eu=AAAAAGA&are=1&cid=1806362680.1776799754&frm=0&pscdl=denied&rcb=8&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=0~115938466~115938468~117266401~117384405~118463261&dl=https%3A%2F%2Fwww.brookings.edu%2F&sid=1776799753&sct=1&seg=0&dt=Brookings%20-%20Quality.%20Independence.%20Impact.&_tu=CA&en=page_view&_fv=1&_ss=1&ep.archived=No&ep.author_id=&ep.author_type=&ep.center=&ep.content_author=&ep.content_language=en&ep.content_type=Page&ep.historical_url=&ep.name=Home&epn.original_post_id=1688589&ep.parent=&epn.post_id=1688589&ep.primary_topic=&ep.program=&ep.project=&ep.publish_date=2023-05-07&ep.region=&ep.subtype=&ep.tag_id=&ep.tags=&ep.template=Home&ep.topic=&ep.type=&epn.word_count=857&ep.count_page_load_completed=1&tfd=2277 — 204 — 48 B — 164 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=9&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.brookings.edu%2F&scrsrc=www.googletagmanager.com&rnd=133030553.1776799754&navt=n&npa=1&us_privacy=1-N-&ep.ads_data_redaction=1&_tu=CA&gtm=45He64h1v72341590za200zd72341590xea&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938466~115938468~117266400&apve=1&apvf=f&apvc=1&tft=1776799754372&tfd=2280pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=9&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.brookings.edu%2F&scrsrc=www.googletagmanager.com&rnd=133030553.1776799754&navt=n&npa=1&us_privacy=1-N-&ep.ads_data_redaction=1&_tu=CA&gtm=45He64h1v72341590za200zd72341590xea&gcs=G100&gcd=13p3p3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938466~115938468~117266400&apve=1&apvf=f&apvc=1&tft=1776799754372&tfd=2280 — 200 — 21 B — 162 ms — 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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 8037ms · 1066KB · $107/mo
www.brookings.edu
Other
Costly
Execution 2181ms
Transfer 151 KB
Monthly Cost $29/mo
Unattributable
Other
Costly
Execution 1170ms
Transfer 0 KB
Monthly Cost $16/mo
www.gstatic.com
Other
Costly
Execution 974ms
Transfer 0 KB
Unused 49%
Monthly Cost $13/mo
www.brookings.edu
Other
Costly
Execution 909ms
Transfer 31 KB
Monthly Cost $12/mo
Google Tag Manager
Tag Manager
Costly
Execution 602ms
Transfer 174 KB
Unused 35%
Monthly Cost $8/mo
cmp.osano.com
Other
Costly
Execution 597ms
Transfer 101 KB
Unused 26%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 445ms
Transfer 144 KB
Unused 46%
Monthly Cost $6/mo
jsDelivr
CDN
Costly
Execution 282ms
Transfer 47 KB
Unused 67%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 279ms
Transfer 157 KB
Unused 41%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 276ms
Transfer 158 KB
Unused 42%
Monthly Cost $4/mo
www.brookings.edu
Other
Optional
Execution 155ms
Transfer 60 KB
Unused 82%
Monthly Cost $2/mo
www.brookings.edu
Other
Optional
Execution 95ms
Transfer 35 KB
Monthly Cost $1/mo
www.brookings.edu
Other
Optional
Execution 72ms
Transfer 9 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.brookings.edu adds 2181ms and costs ~$29/month
  • Unattributable adds 1170ms and costs ~$16/month
  • www.gstatic.com adds 974ms and costs ~$13/month
  • www.brookings.edu adds 909ms and costs ~$12/month
  • Google Tag Manager adds 602ms and costs ~$8/month
  • cmp.osano.com adds 597ms and costs ~$8/month
  • Google Tag Manager adds 445ms and costs ~$6/month
  • jsDelivr adds 282ms and costs ~$4/month
  • Google Tag Manager adds 279ms and costs ~$4/month
  • Google Tag Manager adds 276ms 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.brookings.edu takes 2181ms 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 1170ms 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 974ms 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 909ms 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 602ms 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

cmp.osano.com takes 597ms 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 445ms 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

jsDelivr takes 282ms 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

Google Tag Manager takes 279ms 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

82% of www.brookings.edu'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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