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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
65
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.
77
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.

1.03 s

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

4.85 s

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

182 ms

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

0.056

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

2.25 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.

4.87 s

Page Load Progression

396 ms
793 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 94 requests
FIX
2.6 MB transferred, 94 requests
Warning::
Page weighs 6.2 MB (2.6 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::
94 HTTP requests
Info::
Estimated 0.54 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
94 requests
0.54 g CO2 per page load
JavaScript 1.4 MiB 55%
Images 867.3 KiB 33%
Fonts 224.0 KiB 8%
CSS 48.7 KiB 2%
HTML 34.2 KiB 1%
Other 21.3 KiB 1%
Other 5.8 KiB 0%
Other 1.1 KiB 0%
Other 917 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

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 (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
20 scripts, 691 KB unused
FIX
20 scripts, 691 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/: 75 KB unused (41%)
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.
Warning::
https://www.ucs.org/tm/gtd?id=DC-8188095&cx=c&gtm=...: 67 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 691 KB
691 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/186 KB75 KB (41%)✓3rd
https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4e64k0h1181 KB70 KB (38%)✓3rd
https://www.ucs.org/tm/gtd?id=DC-8188095&cx=c&gtm=4e64k0h1135 KB67 KB (50%)✓3rd
https://www.ucs.org/tm/gtd?id=AW-1071979118&cx=c&gtm=4e64k0h1150 KB67 KB (45%)✓3rd
https://cdn.optimizely.com/js/3747760300.js92 KB43 KB (47%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB35 KB (36%)✓3rd
https://js.verygoodvault.com/vgs-collect/2.18.4/vgs-collect.js44 KB26 KB (61%)✓3rd
https://bat.bing.com/bat.js15 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

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
94 resources · 2.6 MB · 691 KB savings available
FIX
94 resources · 2.6 MB · 691 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~691 KB of savings available
Warning::
93 third-party resources (100% of weight)
Info::
1 resources over 200KB
94 resources · 2.6 MiB · 93 third-party 1.6 MiB over 1MB target
JavaScript 55% · 1.4 MiB
Image 33% · 870.0 KiB
Font 8% · 224.0 KiB
CSS 2% · 48.7 KiB
Document 1% · 36.1 KiB
Other 1% · 24.4 KiB

~691.4 KiB of savings available

Remove unused JavaScript: 691.4 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.

C
Image Optimization
Action
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
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.
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://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.
29 images 867 KB
0 oversized -0 KB
27 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

C
JS Execution Cost
Action
1206ms total JS execution
REVIEW
1206ms total JS execution
Warning::
https://www.ucs.org/: 340ms CPU time
Info::
https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/at...: 216ms CPU time
Info::
https://www.ucs.org/tm/: 132ms CPU time
Info::
Unattributable: 131ms CPU time
Info::
https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4...: 117ms CPU time
Warning::
Third-party scripts: 1206ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Style & Layout 17% Other 15% Script Parsing & Compilation 12%
ScriptTotalScriptingParse/CompileParty
https://www.ucs.org/340ms6ms1ms3rd
https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.js216ms151ms32ms3rd
https://www.ucs.org/tm/132ms108ms21ms3rd
Unattributable131ms3ms0ms3rd
https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4e64k0h1117ms97ms19ms3rd
https://cdn.optimizely.com/js/3747760300.js114ms96ms10ms3rd
https://www.ucs.org/tm/gtd?id=AW-1071979118&cx=c&gtm=4e64k0h186ms65ms20ms3rd
https://www.ucs.org/tm/gtd?id=DC-8188095&cx=c&gtm=4e64k0h169ms55ms14ms3rd
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.0 s LCP 4.8 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 — 38.9 KiB — 28 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 — 22 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 — 36 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 — 14 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 — 50.8 KiB — 15 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 — 20 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 — 42.7 KiB — 23 ms — font-display: swap
GothamSSm-Bold_Web.woff2 woff2 swap
Size 39 KB
Load time 28 ms
Start 615 ms
Risk FOUT — text flashes from fallback to web font
GothamSSm-Book_Web.woff2 woff2 swap
Size 40 KB
Load time 22 ms
Start 615 ms
Risk FOUT — text flashes from fallback to web font
GothamSSm-Book_Web.woff2 woff2 swap
Size 0 KB
Load time 36 ms
Start 879 ms
Risk FOUT — text flashes from fallback to web font
GothamSSm-Bold_Web.woff2 woff2 swap
Size 0 KB
Load time 14 ms
Start 905 ms
Risk FOUT — text flashes from fallback to web font
MercurySSm-Book-Pro_Web... woff2 swap
Size 51 KB
Load time 15 ms
Start 993 ms
Risk FOUT — text flashes from fallback to web font
MercurySSm-Bold-Pro_Web... woff2 swap
Size 51 KB
Load time 20 ms
Start 993 ms
Risk FOUT — text flashes from fallback to web font
MercurySSm-BookItalic-P... woff2 swap
Size 43 KB
Load time 23 ms
Start 993 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
94 requests over 2955ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.0 s LCP 4.8 shttps://ucsusa.org// https://ucsusa.org/ — 301 — 455 B — 18 ms — h3https://www.ucs.org/www.ucs.org/ https://www.ucs.org/ — 200 — 31.1 KiB — 1.1 s — 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 — 38.9 KiB — 28 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 — 22 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 — 1.5 KiB — 19 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 — 20.2 KiB — 21 ms — h2https://cdn.optimizely.com/js/3747760300.jscdn.optimizely.com/js/3747760300.js https://cdn.optimizely.com/js/3747760300.js — 200 — 92.1 KiB — 35 ms — h2https://www.ucs.org/tm/www.ucs.org/tm/ https://www.ucs.org/tm/ — 200 — 185.9 KiB — 51 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NB5C4Qwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NB5C4Q — 200 — 177.6 KiB — 31 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NB5C4Q&gtg_health=1www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NB5C4Q&gtg_health=1 — 200 — 207 B — 6 ms — h2https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4e64k0h1www.ucs.org/tm/?id=G-VB9DKE4V36&cx=... https://www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c&gtm=4e64k0h1 — 200 — 181.4 KiB — 51 ms — h2https://bat.bing.com/bat.jsbat.bing.com/bat.js https://bat.bing.com/bat.js — 200 — 15.5 KiB — 85 ms — h2https://connect.facebook.net/en_US/fbevents.jsconnect.facebook.net/en_US/fbevents... https://connect.facebook.net/en_US/fbevents.js — 200 — 96.6 KiB — 59 ms — h3https://secure.quantserve.com/quant.jssecure.quantserve.com/quant.js https://secure.quantserve.com/quant.js — 200 — 12.2 KiB — 77 ms — h2https://s.yimg.com/wi/ytc.jss.yimg.com/wi/ytc.js https://s.yimg.com/wi/ytc.js — 200 — 7.1 KiB — 79 ms — h2https://js.ipredictive.com/adelphic_universal_pixel.jsjs.ipredictive.com/adelphic_univers... https://js.ipredictive.com/adelphic_universal_pixel.js — 200 — 3.5 KiB — 114 ms — h2https://www.google.com/ccm/collect?rcb=10&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.ucs.org%2F&scrsrc=www.ucs.org&rnd=1744281856.1776891420&dt=Union%20of%20Concerned%20Scientists&auid=677260060.1776891420&navt=n&npa=0&ep.ads_data_redaction=0&gdid=dY2E1Nz.dNzQzZD&gtm=45E92e64k0h1v6541836za204zd6541836xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938465~115938469~117266401&apve=1&apvf=f&gap.gtb=1&apvc=1&tft=1776891420028&tfd=841www.google.com/ccm/collect?rcb=10&f... https://www.google.com/ccm/collect?rcb=10&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.ucs.org%2F&scrsrc=www.ucs.org&rnd=1744281856.1776891420&dt=Union%20of%20Concerned%20Scientists&auid=677260060.1776891420&navt=n&npa=0&ep.ads_data_redaction=0&gdid=dY2E1Nz.dNzQzZD&gtm=45E92e64k0h1v6541836za204zd6541836xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938465~115938469~117266401&apve=1&apvf=f&gap.gtb=1&apvc=1&tft=1776891420028&tfd=841 — 200 — 21 B — 373 ms — h3https://trkn.us/pixel/conv/ppt=25631;g=pageview;gid=65186;ord=842435209trkn.us/pixel/conv/ppt=25631;g=page... https://trkn.us/pixel/conv/ppt=25631;g=pageview;gid=65186;ord=842435209 — 302 — 535 B — 149 ms — http/1.1https://www.ucs.org/sites/default/files/styles/large/public/2019-10/ucsusa_51421561_Full.jpg?itok=xnIF8cLcwww.ucs.org/sites/default/files/sty... https://www.ucs.org/sites/default/files/styles/large/public/2019-10/ucsusa_51421561_Full.jpg?itok=xnIF8cLc — 200 — 103.1 KiB — 1.8 s — 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 — 16.5 KiB — 24 ms — h2https://a3747760300.cdn.optimizely.com/client_storage/a3747760300.htmla3747760300.cdn.optimizely.com/clie... https://a3747760300.cdn.optimizely.com/client_storage/a3747760300.html — 200 — 1.5 KiB — 46 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 — 0 B — 36 ms — h2https://www.ucs.org/sites/default/files/2022-05/strike-crowd.jpgwww.ucs.org/sites/default/files/202... https://www.ucs.org/sites/default/files/2022-05/strike-crowd.jpg — 200 — 113.1 KiB — 38 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 — 0 B — 14 ms — h2https://www.ucs.org/themes/custom/ucstheme/assets/mercury/woff2/MercurySSm-Book-Pro_Web.woff2www.ucs.org/themes/custom/ucstheme/... https://www.ucs.org/themes/custom/ucstheme/assets/mercury/woff2/MercurySSm-Book-Pro_Web.woff2 — 200 — 50.8 KiB — 15 ms — 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h2https://8188095.fls.doubleclick.net/activityi;dc_pre=CJqfs6-sgpQDFUw9gwMddKIcsA;src=8188095;type=site;cat=ucs-h0;rcb=17;ord=5233465687514;npa=0;auiddc=677260060.1776891420;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=2;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_C-SZcHuyy7JBViAqSviNWQzRqicOgwEmag;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F?8188095.fls.doubleclick.net/activit... https://8188095.fls.doubleclick.net/activityi;dc_pre=CJqfs6-sgpQDFUw9gwMddKIcsA;src=8188095;type=site;cat=ucs-h0;rcb=17;ord=5233465687514;npa=0;auiddc=677260060.1776891420;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=2;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_C-SZcHuyy7JBViAqSviNWQzRqicOgwEmag;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F? — 200 — 662 B — 17 ms — h2https://googleads.g.doubleclick.net/pagead/viewthroughconversion/1071979118/?random=1776891420546&cv=11&fst=1776891420546&bg=ffffff&guid=ON&async=1&gtm=45892e64k0h1v9210099727z86541836za20kzb6541836zd6541836xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616986~115938465~115938469~117266401~118463261&u_w=800&u_h=600&url=https%3A%2F%2Fwww.ucs.org%2F&rcb=14&frm=0&tiba=Union%20of%20Concerned%20Scientists&did=dY2E1Nz&gdid=dY2E1Nz&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=677260060.1776891420&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&_tu=CA&gap.gtb=1&rfmt=3&fmt=4googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/viewthroughconversion/1071979118/?random=1776891420546&cv=11&fst=1776891420546&bg=ffffff&guid=ON&async=1&gtm=45892e64k0h1v9210099727z86541836za20kzb6541836zd6541836xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616986~115938465~115938469~117266401~118463261&u_w=800&u_h=600&url=https%3A%2F%2Fwww.ucs.org%2F&rcb=14&frm=0&tiba=Union%20of%20Concerned%20Scientists&did=dY2E1Nz&gdid=dY2E1Nz&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=677260060.1776891420&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&_tu=CA&gap.gtb=1&rfmt=3&fmt=4 — 200 — 2.2 KiB — 36 ms — h3https://www.google.com/rmkt/collect/1071979118/?random=1776891420546&cv=11&fst=1776891420546&fmt=8&bg=ffffff&guid=ON&async=1&gtm=45892e64k0h1v9210099727z86541836za20kzb6541836zd6541836xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616986~115938465~115938469~117266401~118463261&u_w=800&u_h=600&url=https%3A%2F%2Fwww.ucs.org%2F&rcb=14&frm=0&tiba=Union%20of%20Concerned%20Scientists&did=dY2E1Nz&gdid=dY2E1Nz&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=677260060.1776891420&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&_tu=CA&gap.gtb=1&gcp=5www.google.com/rmkt/collect/1071979... https://www.google.com/rmkt/collect/1071979118/?random=1776891420546&cv=11&fst=1776891420546&fmt=8&bg=ffffff&guid=ON&async=1&gtm=45892e64k0h1v9210099727z86541836za20kzb6541836zd6541836xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616986~115938465~115938469~117266401~118463261&u_w=800&u_h=600&url=https%3A%2F%2Fwww.ucs.org%2F&rcb=14&frm=0&tiba=Union%20of%20Concerned%20Scientists&did=dY2E1Nz&gdid=dY2E1Nz&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=677260060.1776891420&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&_tu=CA&gap.gtb=1&gcp=5 — 200 — 20 B — 48 ms — h3https://www.google.com/ccm/collect?rcb=14&frm=0&ae=g&dl=https%3A%2F%2Fwww.ucs.org%2F&scrsrc=www.ucs.org&rnd=1744281856.1776891420&dt=Union%20of%20Concerned%20Scientists&auid=677260060.1776891420&navt=n&npa=0&did=dY2E1Nz&gdid=dY2E1Nz&_tu=CA&gtm=45892e64k0h1v9210099727z86541836za20kzb6541836zd6541836xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616986~115938465~115938469~117266401~118463261&apve=1&apvf=f&gap.gtb=1&apvc=0&tids=AW-1071979118&tid=AW-1071979118&tft=1776891420571&tfd=1383www.google.com/ccm/collect?rcb=14&f... https://www.google.com/ccm/collect?rcb=14&frm=0&ae=g&dl=https%3A%2F%2Fwww.ucs.org%2F&scrsrc=www.ucs.org&rnd=1744281856.1776891420&dt=Union%20of%20Concerned%20Scientists&auid=677260060.1776891420&navt=n&npa=0&did=dY2E1Nz&gdid=dY2E1Nz&_tu=CA&gtm=45892e64k0h1v9210099727z86541836za20kzb6541836zd6541836xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115616986~115938465~115938469~117266401~118463261&apve=1&apvf=f&gap.gtb=1&apvc=0&tids=AW-1071979118&tid=AW-1071979118&tft=1776891420571&tfd=1383 — 200 — 21 B — 48 ms — h3https://www.ucs.org/themes/custom/ucstheme/assets/donut-chart.svgwww.ucs.org/themes/custom/ucstheme/... https://www.ucs.org/themes/custom/ucstheme/assets/donut-chart.svg — 200 — 1.5 KiB — 21 ms — h2https://adservice.google.com/ddm/fls/z/dc_pre=COaRs6-sgpQDFQoXgwMduwQxQQ;src=8188095;type=site;cat=ucs-g0;rcb=17;ord=6557676097080;npa=0;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=2;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_Rzjk0EUwRWdeApvIPcLB27f7_7Q8Dyd9ow;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2Fadservice.google.com/ddm/fls/z/dc_p... https://adservice.google.com/ddm/fls/z/dc_pre=COaRs6-sgpQDFQoXgwMduwQxQQ;src=8188095;type=site;cat=ucs-g0;rcb=17;ord=6557676097080;npa=0;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=2;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_Rzjk0EUwRWdeApvIPcLB27f7_7Q8Dyd9ow;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F — 200 — 63 B — 35 ms — h3https://adservice.google.com/ddm/fls/z/dc_pre=CJqfs6-sgpQDFUw9gwMddKIcsA;src=8188095;type=site;cat=ucs-h0;rcb=17;ord=5233465687514;npa=0;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=2;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_C-SZcHuyy7JBViAqSviNWQzRqicOgwEmag;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2Fadservice.google.com/ddm/fls/z/dc_p... https://adservice.google.com/ddm/fls/z/dc_pre=CJqfs6-sgpQDFUw9gwMddKIcsA;src=8188095;type=site;cat=ucs-h0;rcb=17;ord=5233465687514;npa=0;auiddc=*;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=2;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_C-SZcHuyy7JBViAqSviNWQzRqicOgwEmag;_dc_test=1;~oref=https%3A%2F%2Fwww.ucs.org%2F — 200 — 63 B — 21 ms — h3https://www.google.com/gmp/conversion/_dc_unique_id=9317516837596610812;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4C35JrQIe5Iix1CF9XEdUbsvT7ZgjvLdTMlv;_dc_time=1776891420;dc_pre=CK2Ls6-sgpQDFXeKZgIdGikW8Q;src=8188095;type=site;cat=ucs-h0;rcb=17;ord=5233465687514;npa=0;auiddc=677260060.1776891420;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=3;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_C-SZcHuyy7JBViAqSviNWQzRqicOgwEmag;~oref=https%3A%2F%2Fwww.ucs.org%2F?www.google.com/gmp/conversion/_dc_u... https://www.google.com/gmp/conversion/_dc_unique_id=9317516837596610812;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4C35JrQIe5Iix1CF9XEdUbsvT7ZgjvLdTMlv;_dc_time=1776891420;dc_pre=CK2Ls6-sgpQDFXeKZgIdGikW8Q;src=8188095;type=site;cat=ucs-h0;rcb=17;ord=5233465687514;npa=0;auiddc=677260060.1776891420;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=3;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_C-SZcHuyy7JBViAqSviNWQzRqicOgwEmag;~oref=https%3A%2F%2Fwww.ucs.org%2F? — 200 — 63 B — 434 ms — h3https://www.google.com/gmp/conversion/_dc_unique_id=14563343635086594039;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4PD4YF9E2fHzVJWr6o7g1OYxBFYAQa3RcgJP;_dc_time=1776891420;dc_pre=COeDs6-sgpQDFYCpZgIdQLU9JQ;src=8188095;type=site;cat=ucs-g0;rcb=17;ord=6557676097080;npa=0;auiddc=677260060.1776891420;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=3;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_Rzjk0EUwRWdeApvIPcLB27f7_7Q8Dyd9ow;~oref=https%3A%2F%2Fwww.ucs.org%2F?www.google.com/gmp/conversion/_dc_u... https://www.google.com/gmp/conversion/_dc_unique_id=14563343635086594039;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4PD4YF9E2fHzVJWr6o7g1OYxBFYAQa3RcgJP;_dc_time=1776891420;dc_pre=COeDs6-sgpQDFYCpZgIdQLU9JQ;src=8188095;type=site;cat=ucs-g0;rcb=17;ord=6557676097080;npa=0;auiddc=677260060.1776891420;u1=%2F;gdid=dY2E1Nz;uaa=x86;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KFA;gtm=45c92e64k0h1v9189007292z86541836za20kzb6541836zd6541836xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=3;tag_exp=0~115938465~115938469~117266401;epver=2;gap.gtb=1;dc_random=1776891420_Rzjk0EUwRWdeApvIPcLB27f7_7Q8Dyd9ow;~oref=https%3A%2F%2Fwww.ucs.org%2F? — 200 — 63 B — 346 ms — h3https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.min.cssd1aqhv4sn5kxtx.cloudfront.net/actio... https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.min.css — 200 — 12.4 KiB — 13 ms — http/1.1https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/extra.min.cssd1aqhv4sn5kxtx.cloudfront.net/actio... https://d1aqhv4sn5kxtx.cloudfront.net/actiontag/extra.min.css — 200 — 14.5 KiB — 13 ms — http/1.1https://js.verygoodvault.com/vgs-collect/2.18.4/vgs-collect.jsjs.verygoodvault.com/vgs-collect/2.... https://js.verygoodvault.com/vgs-collect/2.18.4/vgs-collect.js — 200 — 43.8 KiB — 220 ms — http/1.1https://actions.everyaction.com/v1/Forms/riz_81HSRkGMC2loQcyxiQ2actions.everyaction.com/v1/Forms/ri... https://actions.everyaction.com/v1/Forms/riz_81HSRkGMC2loQcyxiQ2 — -1 — 0 B — 131 ms — https://actions.everyaction.com/v1/Forms/riz_81HSRkGMC2loQcyxiQ2actions.everyaction.com/v1/Forms/ri... https://actions.everyaction.com/v1/Forms/riz_81HSRkGMC2loQcyxiQ2 — -1 — 0 B — 124 ms — https://advocator.ngpvan.com/https%3a%2f%2fsecure.everyaction.com%2fv1%2fForms%2fGQrln-2QfU-0teQoe1VjgQ2/ngpFormadvocator.ngpvan.com/https%3a%2f%2f... 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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 1206ms · 1045KB · €21/mo
www.ucs.org
Other
Costly
Execution 340ms
Transfer 31 KB
Monthly Cost €6/mo
d1aqhv4sn5kxtx.cloudfront.net
Other
Costly
Execution 216ms
Transfer 270 KB
Unused 72%
Monthly Cost €4/mo
www.ucs.org
Other
Optional
Execution 132ms
Transfer 186 KB
Unused 41%
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 131ms
Transfer 0 KB
Monthly Cost €2/mo
www.ucs.org
Other
Optional
Execution 117ms
Transfer 181 KB
Unused 38%
Monthly Cost €2/mo
Optimizely
A/B Testing
Optional
Execution 114ms
Transfer 92 KB
Unused 47%
Monthly Cost €2/mo
www.ucs.org
Other
Optional
Execution 86ms
Transfer 150 KB
Unused 45%
Monthly Cost €1/mo
www.ucs.org
Other
Optional
Execution 69ms
Transfer 135 KB
Unused 50%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.ucs.org adds 340ms and costs ~€6/month
  • d1aqhv4sn5kxtx.cloudfront.net adds 216ms 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 340ms 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 216ms 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

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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