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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

3.94 s

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

10.62 s

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

924 ms

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

0.128

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

6.35 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.

18.97 s

Page Load Progression

506 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
17
8 PASS 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 84 requests
FIX
2.3 MB transferred, 84 requests
Info::
Page weighs 5.9 MB (2.3 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
Fonts are 224 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 224 KB
Info::
84 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
84 requests
0.48 g CO2 per page load
JavaScript 1.4 MiB 63%
Images 535.2 KiB 23%
Fonts 224.3 KiB 10%
CSS 49.0 KiB 2%
HTML 34.9 KiB 1%
Other 21.7 KiB 1%
Other 4.6 KiB 0%
Other 976 B 0%
Other 674 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

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 (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3408ms total JS execution
FIX
3408ms total JS execution
Warning::
https://www.ucs.org/: 642ms CPU time
Warning::
https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/at...: 534ms CPU time
Warning::
Unattributable: 471ms CPU time
Warning::
https://www.ucs.org/tm/: 405ms CPU time
Warning::
https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4...: 310ms CPU time
Warning::
Third-party scripts: 3408ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 17% Script Parsing & Compilation 11% Style & Layout 10%
ScriptTotalScriptingParse/CompileParty
https://www.ucs.org/642ms13ms4ms3rd
https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.js534ms408ms90ms3rd
Unattributable471ms25ms0ms3rd
https://www.ucs.org/tm/405ms343ms45ms3rd
https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4e64k0310ms263ms46ms3rd
https://cdn.optimizely.com/js/3747760300.js307ms268ms22ms3rd
https://www.ucs.org/tm/gtd?id=DC-8188095&cx=c&gtm=4e64k0210ms176ms31ms3rd
https://www.ucs.org/tm/gtd?id=AW-1071979118&cx=c&gtm=4e64k0177ms142ms34ms3rd
https://connect.facebook.net/signals/config/625465517575530?v=2.9.303&r=stable&domain=www.ucs.org&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168111ms91ms19ms3rd
https://connect.facebook.net/en_US/fbevents.js108ms83ms25ms3rd

Showing top 10 of 12 scripts

F
JS Bundles
Action
20 scripts, 692 KB unused
FIX
20 scripts, 692 KB unused
Warning::
https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/at...: 194 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NB5...: 114 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ucs.org/tm/gtd?id=AW-1071979118&cx=c&g...: 74 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ucs.org/tm/: 70 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4...: 70 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 692 KB
692 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.js270 KB194 KB (72%)3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NB5C4Q178 KB114 KB (64%)3rd
https://www.ucs.org/tm/gtd?id=AW-1071979118&cx=c&gtm=4e64k0150 KB74 KB (50%)3rd
https://www.ucs.org/tm/186 KB70 KB (38%)3rd
https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4e64k0182 KB70 KB (38%)3rd
https://www.ucs.org/tm/gtd?id=DC-8188095&cx=c&gtm=4e64k0135 KB67 KB (50%)3rd
https://cdn.optimizely.com/js/3747760300.js92 KB43 KB (47%)3rd
https://connect.facebook.net/en_US/fbevents.js99 KB34 KB (35%)3rd
https://js.verygoodvault.com/vgs-collect/2.18.4/vgs-collect.js44 KB26 KB (60%)3rd
https://secure.quantserve.com/quant.js12 KB3rd

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
84 resources · 2.3 MB · 692 KB savings available
FIX
84 resources · 2.3 MB · 692 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~692 KB of savings available
Warning::
83 third-party resources (100% of weight)
Info::
1 resources over 200KB
84 resources · 2.3 MiB · 83 third-party 1.3 MiB over 1MB target
JavaScript 63% · 1.4 MiB
Image 23% · 537.7 KiB
Font 10% · 224.3 KiB
CSS 2% · 49.0 KiB
Document 2% · 36.2 KiB
Other 1% · 24.0 KiB

~692.3 KiB of savings available

Remove unused JavaScript: 692.3 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
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://www.ucs.org/sites/default/files/2019-10/st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://blog.ucs.org/wp-content/uploads/2021/09/wo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://blog.ucs.org/wp-content/uploads/2026/04/Bl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://blog.ucs.org/wp-content/uploads/2026/04/Co... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 535 KB
0 oversized -0 KB
20 legacy format
4 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

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

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
7 fonts (224 KB)
PASS
7 fonts (224 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

224 KB total

Render-blocking

0

of 7

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 FCP 3.9 s LCP 10.6 shttps://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Bold_Web.woff2GothamSSm-Bold_Web.woff2 https://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Bold_Web.woff2 — 39.0 KiB — 481 ms — font-display: swaphttps://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Book_Web.woff2GothamSSm-Book_Web.woff2 https://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Book_Web.woff2 — 40.3 KiB — 422 ms — font-display: swaphttps://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Bold_Web.woff2GothamSSm-Bold_Web.woff2 https://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Bold_Web.woff2 — 0 B — 94 ms — font-display: swaphttps://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Book_Web.woff2GothamSSm-Book_Web.woff2 https://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Book_Web.woff2 — 0 B — 35 ms — font-display: swaphttps://www.ucs.org/themes/custom/ucstheme/assets/mercury/woff2/MercurySSm-Book-Pro_Web.woff2MercurySSm-Book-Pro_Web... https://www.ucs.org/themes/custom/ucstheme/assets/mercury/woff2/MercurySSm-Book-Pro_Web.woff2 — 50.7 KiB — 418 ms — font-display: swaphttps://www.ucs.org/themes/custom/ucstheme/assets/mercury/woff2/MercurySSm-Bold-Pro_Web.woff2MercurySSm-Bold-Pro_Web... https://www.ucs.org/themes/custom/ucstheme/assets/mercury/woff2/MercurySSm-Bold-Pro_Web.woff2 — 51.4 KiB — 448 ms — font-display: swaphttps://www.ucs.org/themes/custom/ucstheme/assets/mercury/woff2/MercurySSm-BookItalic-Pro_Web.woff2MercurySSm-BookItalic-P... https://www.ucs.org/themes/custom/ucstheme/assets/mercury/woff2/MercurySSm-BookItalic-Pro_Web.woff2 — 42.9 KiB — 427 ms — font-display: swap
GothamSSm-Bold_Web.woff2 woff2 swap
Size 39 KB
Load time 481 ms
Start 748 ms
Risk FOUT — text flashes from fallback to web font
GothamSSm-Book_Web.woff2 woff2 swap
Size 40 KB
Load time 422 ms
Start 748 ms
Risk FOUT — text flashes from fallback to web font
GothamSSm-Bold_Web.woff2 woff2 swap
Size 0 KB
Load time 94 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
GothamSSm-Book_Web.woff2 woff2 swap
Size 0 KB
Load time 35 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
MercurySSm-Book-Pro_Web... woff2 swap
Size 51 KB
Load time 418 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
MercurySSm-Bold-Pro_Web... woff2 swap
Size 51 KB
Load time 448 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
MercurySSm-BookItalic-P... woff2 swap
Size 43 KB
Load time 427 ms
Start 1.2 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
preload
2
dns-prefetch
prefetch

2 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
84 requests over 4015ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.9 s LCP 10.6 shttps://ucs.org// https://ucs.org/ — 301 — 715 B — 482 ms — h2https://www.ucs.org/www.ucs.org/ https://www.ucs.org/ — 200 — 31.5 KiB — 446 ms — h2https://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Bold_Web.woff2www.ucs.org/themes/custom/ucstheme/... https://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Bold_Web.woff2 — 200 — 39.0 KiB — 481 ms — h2https://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Book_Web.woff2www.ucs.org/themes/custom/ucstheme/... https://www.ucs.org/themes/custom/ucstheme/assets/gotham/woff2/GothamSSm-Book_Web.woff2 — 200 — 40.3 KiB — 422 ms — h2https://www.ucs.org/sites/default/files/css/css_OtJcwHerXdLJUIRGUEgICpAWNakmNPTsiq2Z0N0e5-c.css?delta=0&language=en&theme=ucstheme&include=eJxFjEEKxCAQBD80OG8atVFhjGLHXZLXBzaHvRRFHSq5kZdGIyS93kFaASWNBT3G6ubthkxbVpbNSs1rT_PwL2Efc0dvrMjCiyf6-9yJZ0WHFh_RnPJp-FJ_DH3k7XgAMpQzSAwww.ucs.org/sites/default/files/css... https://www.ucs.org/sites/default/files/css/css_OtJcwHerXdLJUIRGUEgICpAWNakmNPTsiq2Z0N0e5-c.css?delta=0&language=en&theme=ucstheme&include=eJxFjEEKxCAQBD80OG8atVFhjGLHXZLXBzaHvRRFHSq5kZdGIyS93kFaASWNBT3G6ubthkxbVpbNSs1rT_PwL2Efc0dvrMjCiyf6-9yJZ0WHFh_RnPJp-FJ_DH3k7XgAMpQzSA — 200 — 1.6 KiB — 30 ms — h2https://www.ucs.org/sites/default/files/css/css_CK-LRT_1yKGV3VPtS-Xlppzsd2JEcTxroVynb-mCpr4.css?delta=1&language=en&theme=ucstheme&include=eJxFjEEKxCAQBD80OG8atVFhjGLHXZLXBzaHvRRFHSq5kZdGIyS93kFaASWNBT3G6ubthkxbVpbNSs1rT_PwL2Efc0dvrMjCiyf6-9yJZ0WHFh_RnPJp-FJ_DH3k7XgAMpQzSAwww.ucs.org/sites/default/files/css... https://www.ucs.org/sites/default/files/css/css_CK-LRT_1yKGV3VPtS-Xlppzsd2JEcTxroVynb-mCpr4.css?delta=1&language=en&theme=ucstheme&include=eJxFjEEKxCAQBD80OG8atVFhjGLHXZLXBzaHvRRFHSq5kZdGIyS93kFaASWNBT3G6ubthkxbVpbNSs1rT_PwL2Efc0dvrMjCiyf6-9yJZ0WHFh_RnPJp-FJ_DH3k7XgAMpQzSA — 200 — 20.4 KiB — 32 ms — h2https://cdn.optimizely.com/js/3747760300.jscdn.optimizely.com/js/3747760300.js https://cdn.optimizely.com/js/3747760300.js — 200 — 92.1 KiB — 228 ms — h2https://www.ucs.org/sites/default/files/styles/medium/public/2019-10/ucsusa_51421561_Full.jpg?itok=ia18wscywww.ucs.org/sites/default/files/sty... https://www.ucs.org/sites/default/files/styles/medium/public/2019-10/ucsusa_51421561_Full.jpg?itok=ia18wscy — 200 — 53.5 KiB — 686 ms — h2https://www.ucs.org/sites/default/files/2019-10/store-promo-small.pngwww.ucs.org/sites/default/files/201... https://www.ucs.org/sites/default/files/2019-10/store-promo-small.png — 200 — 16.4 KiB — 470 ms — 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https://connect.facebook.net/signals/config/625465517575530?v=2.9.303&r=stable&domain=www.ucs.org&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 — 200 — 45.9 KiB — 188 ms — h2https://www.google.com/ccm/collect?rcb=16&frm=0&ae=g&dl=https%3A%2F%2Fwww.ucs.org%2F&scrsrc=www.ucs.org&rnd=1837586218.1776895644&dt=Union%20of%20Concerned%20Scientists&auid=1851796874.1776895644&navt=n&npa=1&did=dY2E1Nz&gdid=dY2E1Nz&_tu=CA&gtm=45892e64k0v9210099727z86541836za20kzb6541836zd6541836xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938469~117266400~117884344&apve=1&apvf=f&gap.gtb=2&apvc=0&tids=AW-1071979118&tid=AW-1071979118&tft=1776895644921&tfd=1921www.google.com/ccm/collect?rcb=16&f... https://www.google.com/ccm/collect?rcb=16&frm=0&ae=g&dl=https%3A%2F%2Fwww.ucs.org%2F&scrsrc=www.ucs.org&rnd=1837586218.1776895644&dt=Union%20of%20Concerned%20Scientists&auid=1851796874.1776895644&navt=n&npa=1&did=dY2E1Nz&gdid=dY2E1Nz&_tu=CA&gtm=45892e64k0v9210099727z86541836za20kzb6541836zd6541836xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938469~117266400~117884344&apve=1&apvf=f&gap.gtb=2&apvc=0&tids=AW-1071979118&tid=AW-1071979118&tft=1776895644921&tfd=1921 — 200 — 21 B — 59 ms — h3https://ad.doubleclick.net/activity;src=8188095;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;~oref=https%3A%2F%2Fwww.ucs.org%2F?ad.doubleclick.net/activity;src=818... 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h3https://8188095.fls.doubleclick.net/activityi;src=8188095;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F?8188095.fls.doubleclick.net/activit... https://8188095.fls.doubleclick.net/activityi;src=8188095;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F? — 200 — 1008 B — 173 ms — 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https://ad.doubleclick.net/activity;src=8188095;type=site;cat=ucs-h0;rcb=14;ord=4354803207769;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_WU6CRDMEvRN3cInIHvp-1ROrVLL0uoiCEg;~oref=https%3A%2F%2Fwww.ucs.org%2F? — 302 — 21 B — 403 ms — 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https://8188095.fls.doubleclick.net/activityi;src=8188095;type=site;cat=ucs-h0;rcb=14;ord=4354803207769;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_WU6CRDMEvRN3cInIHvp-1ROrVLL0uoiCEg;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F? — 200 — 675 B — 171 ms — h2https://logx.optimizely.com/v1/eventslogx.optimizely.com/v1/events https://logx.optimizely.com/v1/events — 204 — 383 B — 107 ms — 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https://www.facebook.com/tr/?id=625465517575530&ev=PageView&dl=https%3A%2F%2Fwww.ucs.org%2F&rl=&if=false&ts=1776895645091&sw=412&sh=823&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.1.1776895645082.462072356636172274&ler=empty&cdl=API_unavailable&pmd[title]=Union%20of%20Concerned%20Scientists&pmd[locale]=en&pmd[description]=The%20Union%20of%20Concerned%20Scientists%20puts%20rigorous%2C%20independent%20science%20to%20work%20to%20solve%20our%20planet%27s%20most%20pressing%20problems.%20Joining%20with%20people%20across%20the%20country%2C%20we%20combine%20technical%20analysis%20and%20effective%20advocacy%20to%20create%20innovative%2C%20practical%20solutions%20for%20a%20healthy%2C%20safe%2C%20and%20sustainable%20future.&plt=1311.2999992370605&it=1776895644868&coo=false&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&expv2[0]=pl0&expv2[1]=el2&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im1&expv2[6]=hf0&rqm=GET — 200 — 19 B — 38 ms — 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https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=625465517575530&ev=PageView&dl=https%3A%2F%2Fwww.ucs.org%2F&rl=&if=false&ts=1776895645091&sw=412&sh=823&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.1.1776895645082.462072356636172274&ler=empty&cdl=API_unavailable&pmd[title]=Union%20of%20Concerned%20Scientists&pmd[locale]=en&pmd[description]=The%20Union%20of%20Concerned%20Scientists%20puts%20rigorous%2C%20independent%20science%20to%20work%20to%20solve%20our%20planet%27s%20most%20pressing%20problems.%20Joining%20with%20people%20across%20the%20country%2C%20we%20combine%20technical%20analysis%20and%20effective%20advocacy%20to%20create%20innovative%2C%20practical%20solutions%20for%20a%20healthy%2C%20safe%2C%20and%20sustainable%20future.&plt=1311.2999992370605&it=1776895644868&coo=false&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&expv2[0]=pl0&expv2[1]=el2&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im1&expv2[6]=hf0&rqm=FGET — 200 — 196 B — 227 ms — h3https://www.google.com/gmp/conversion/_dc_unique_id=12173750777692374660;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4D_AQDOup6qCfb4-Cl6R2t0CkoV_4dqk2qfy;_dc_time=1776895645;src=8188095;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;~oref=https%3A%2F%2Fwww.ucs.org%2F?www.google.com/gmp/conversion/_dc_u... https://www.google.com/gmp/conversion/_dc_unique_id=12173750777692374660;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4D_AQDOup6qCfb4-Cl6R2t0CkoV_4dqk2qfy;_dc_time=1776895645;src=8188095;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;~oref=https%3A%2F%2Fwww.ucs.org%2F? — 200 — 63 B — 230 ms — h3https://www.google.com/gmp/conversion/_dc_unique_id=9231540538266427660;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4KdmuvwJTAt6b_AqI96l-rW4JhPpETJn3qAY;_dc_time=1776895645;src=8188095;type=site;cat=ucs-h0;rcb=14;ord=4354803207769;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_WU6CRDMEvRN3cInIHvp-1ROrVLL0uoiCEg;~oref=https%3A%2F%2Fwww.ucs.org%2F?www.google.com/gmp/conversion/_dc_u... https://www.google.com/gmp/conversion/_dc_unique_id=9231540538266427660;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4KdmuvwJTAt6b_AqI96l-rW4JhPpETJn3qAY;_dc_time=1776895645;src=8188095;type=site;cat=ucs-h0;rcb=14;ord=4354803207769;npa=1;auiddc=1851796874.1776895644;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_WU6CRDMEvRN3cInIHvp-1ROrVLL0uoiCEg;~oref=https%3A%2F%2Fwww.ucs.org%2F? — 200 — 63 B — 223 ms — h3https://adservice.google.com/ddm/fls/z/src=8188095;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2Fadservice.google.com/ddm/fls/z/src=... https://adservice.google.com/ddm/fls/z/src=8188095;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F — 302 — 22 B — 119 ms — h3https://adservice.google.com/ddm/fls/z/src=8188095;type=site;cat=ucs-h0;rcb=14;ord=4354803207769;npa=1;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_WU6CRDMEvRN3cInIHvp-1ROrVLL0uoiCEg;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2Fadservice.google.com/ddm/fls/z/src=... https://adservice.google.com/ddm/fls/z/src=8188095;type=site;cat=ucs-h0;rcb=14;ord=4354803207769;npa=1;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_WU6CRDMEvRN3cInIHvp-1ROrVLL0uoiCEg;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F — 302 — 22 B — 115 ms — h3https://adservice.google.com/ddm/fls/z/src=8188095;dc_pre=CIni9I28gpQDFX5hHQkd4-EZ6Q;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2Fadservice.google.com/ddm/fls/z/src=... https://adservice.google.com/ddm/fls/z/src=8188095;dc_pre=CIni9I28gpQDFX5hHQkd4-EZ6Q;type=site;cat=ucs-g0;rcb=14;ord=1568743268798;npa=1;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_SaVrcwR2DAuqNWZ1525I1AYyC3Gz5wFk7g;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F — 200 — 63 B — 33 ms — h3https://adservice.google.com/ddm/fls/z/src=8188095;dc_pre=CJfo9I28gpQDFZlVHQkd4BUsiQ;type=site;cat=ucs-h0;rcb=14;ord=4354803207769;npa=1;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_WU6CRDMEvRN3cInIHvp-1ROrVLL0uoiCEg;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2Fadservice.google.com/ddm/fls/z/src=... https://adservice.google.com/ddm/fls/z/src=8188095;dc_pre=CJfo9I28gpQDFZlVHQkd4BUsiQ;type=site;cat=ucs-h0;rcb=14;ord=4354803207769;npa=1;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115616986~115938466~115938469~117266400~117384405;epver=2;gap.gtb=2;dc_random=1776895644_WU6CRDMEvRN3cInIHvp-1ROrVLL0uoiCEg;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F — 200 — 63 B — 35 ms — h3https://www.ucs.org/themes/custom/ucstheme/assets/favicon.icowww.ucs.org/themes/custom/ucstheme/... https://www.ucs.org/themes/custom/ucstheme/assets/favicon.ico — 200 — 2.4 KiB — 442 ms — h2https://blog.ucs.org/wp-content/uploads/2026/04/Blog-Thumbnail-BP-logo-greenpeace-parody-500x300.jpgblog.ucs.org/wp-content/uploads/202... https://blog.ucs.org/wp-content/uploads/2026/04/Blog-Thumbnail-BP-logo-greenpeace-parody-500x300.jpg — 200 — 25.6 KiB — 116 ms — h3https://blog.ucs.org/wp-content/uploads/2021/09/worker-silhouette-drinking-water-in-extreme-heat-500x300.jpgblog.ucs.org/wp-content/uploads/202... https://blog.ucs.org/wp-content/uploads/2021/09/worker-silhouette-drinking-water-in-extreme-heat-500x300.jpg — 200 — 11.5 KiB — 106 ms — h3https://blog.ucs.org/wp-content/uploads/2026/04/Copy-of-Blog-Lead-Image-Template226-500x300.jpgblog.ucs.org/wp-content/uploads/202... https://blog.ucs.org/wp-content/uploads/2026/04/Copy-of-Blog-Lead-Image-Template226-500x300.jpg — 200 — 30.4 KiB — 111 ms — h3https://logx.optimizely.com/v1/eventslogx.optimizely.com/v1/events https://logx.optimizely.com/v1/events — 204 — 73 B — 31 ms — h2https://advocator.ngpvan.com/https%3a%2f%2fsecure.everyaction.com%2fv1%2fForms%2fGQrln-2QfU-0teQoe1VjgQ2/ngpFormadvocator.ngpvan.com/https%3a%2f%2f... https://advocator.ngpvan.com/https%3a%2f%2fsecure.everyaction.com%2fv1%2fForms%2fGQrln-2QfU-0teQoe1VjgQ2/ngpForm — -1 — 0 B — 23 ms —
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 3408ms · 1412KB · €59/mo
www.ucs.org
Other
Costly
Execution 642ms
Transfer 31 KB
Monthly Cost €11/mo
d1aqhv4sn5kxtx.cloudfront.net
Other
Costly
Execution 534ms
Transfer 270 KB
Unused 72%
Monthly Cost €9/mo
Unattributable
Other
Costly
Execution 471ms
Transfer 0 KB
Monthly Cost €8/mo
www.ucs.org
Other
Costly
Execution 405ms
Transfer 186 KB
Unused 38%
Monthly Cost €7/mo
www.ucs.org
Other
Costly
Execution 310ms
Transfer 182 KB
Unused 38%
Monthly Cost €5/mo
Optimizely
A/B Testing
Costly
Execution 307ms
Transfer 92 KB
Unused 47%
Monthly Cost €5/mo
www.ucs.org
Other
Costly
Execution 210ms
Transfer 135 KB
Unused 50%
Monthly Cost €4/mo
www.ucs.org
Other
Optional
Execution 177ms
Transfer 150 KB
Unused 50%
Monthly Cost €3/mo
Facebook Pixel
Advertising
Optional
Execution 111ms
Transfer 46 KB
Monthly Cost €2/mo
Facebook Pixel
Advertising
Optional
Execution 108ms
Transfer 99 KB
Unused 35%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 76ms
Transfer 178 KB
Unused 64%
Monthly Cost €1/mo
js.verygoodvault.com
Other
Optional
Execution 57ms
Transfer 44 KB
Unused 60%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.ucs.org adds 642ms and costs ~€11/month
  • d1aqhv4sn5kxtx.cloudfront.net adds 534ms and costs ~€9/month
  • Unattributable adds 471ms and costs ~€8/month
  • www.ucs.org adds 405ms and costs ~€7/month
  • www.ucs.org adds 310ms and costs ~€5/month
  • Optimizely adds 307ms and costs ~€5/month
  • www.ucs.org adds 210ms 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.ucs.org takes 642ms 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

d1aqhv4sn5kxtx.cloudfront.net takes 534ms 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

72% of d1aqhv4sn5kxtx.cloudfront.net'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

Unattributable takes 471ms 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.ucs.org takes 405ms 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.ucs.org takes 310ms 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

Optimizely takes 307ms 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.ucs.org takes 210ms 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

64% 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

60% of js.verygoodvault.com'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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