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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
64
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
73
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.

4.58 s

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

12.77 s

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

15 ms

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

0.005

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

4.58 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.

12.82 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 50 requests
FIX
3.0 MB transferred, 50 requests
Warning::
Page weighs 3.3 MB (3.0 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 MB
Info::
50 HTTP requests
Info::
Estimated 0.63 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
50 requests
0.63 g CO2 per page load
Images 2.7 MiB 91%
Fonts 139.6 KiB 5%
JavaScript 93.7 KiB 3%
CSS 28.1 KiB 1%
HTML 11.7 KiB 0%
Other 3.9 KiB 0%
Other 1.6 KiB 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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
50 resources · 3.0 MB · 0 KB savings available
FIX
50 resources · 3.0 MB · 0 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Warning::
49 third-party resources (100% of weight)
Info::
4 resources over 200KB
50 resources · 3.0 MiB · 49 third-party 2.0 MiB over 1MB target
Image 91% · 2.7 MiB
Font 5% · 139.6 KiB
JavaScript 3% · 93.7 KiB
CSS 1% · 28.1 KiB
Document 0% · 11.7 KiB
Other 0% · 2.9 KiB
C
Image Optimization
Action
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://www.senate.gov/resources/images/col2_senat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.senate.gov/resources/images/33_00019.j... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.senate.gov/resources/images/usFlag.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.senate.gov/resources/graphic/history_l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.senate.gov/resources/images/senate_log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.senate.gov/resources/images/senate_log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 2.7 MB
0 oversized -0 KB
20 legacy format
6 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

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

B
JS Execution Cost
777ms total JS execution
REVIEW
777ms total JS execution
Warning::
Unattributable: 291ms CPU time
Info::
https://www.senate.gov/resources/scripts/jquery-1....: 234ms CPU time
Info::
https://assets.adobedtm.com/566dc2d26e4f/843d2f589...: 165ms CPU time
Info::
https://www.senate.gov/: 86ms CPU time
Warning::
Third-party scripts: 777ms (100% of total)

Main Thread Breakdown

Other 41% Script Evaluation 33% Style & Layout 18% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable291ms5ms0ms3rd
https://www.senate.gov/resources/scripts/jquery-1.11.3.min.js234ms84ms7ms3rd
https://assets.adobedtm.com/566dc2d26e4f/843d2f589d53/launch-01bbfeb2a9a5.min.js165ms150ms9ms3rd
https://www.senate.gov/86ms10ms1ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0, no-cache
REVIEW
max-age=0, no-cache
Info::
Cache-Control header is set
Got: max-age=0, no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
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
5 fonts (140 KB)
PASS
5 fonts (140 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

140 KB total

Render-blocking

0

of 5

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 FCP 4.6 s LCP 12.8 shttps://www.senate.gov/resources/fonts/ODelI1aHBYDBqgeIAH2zlBM0YzuT7MdOe03otPbuUS0.woffODelI1aHBYDBqgeIAH2zlBM... https://www.senate.gov/resources/fonts/ODelI1aHBYDBqgeIAH2zlBM0YzuT7MdOe03otPbuUS0.woff — 17.4 KiB — 289 ms — font-display: swaphttps://www.senate.gov/resources/fonts/fonts/fontawesome-webfont.woff2?v=4.6.3fontawesome-webfont.woff2 https://www.senate.gov/resources/fonts/fonts/fontawesome-webfont.woff2?v=4.6.3 — 70.5 KiB — 342 ms — font-display: swaphttps://www.senate.gov/resources/fonts/toadOcfmlt9b38dHJxOBGJ6-ys_j0H4QL65VLqzI3wI.wofftoadOcfmlt9b38dHJxOBGJ6... https://www.senate.gov/resources/fonts/toadOcfmlt9b38dHJxOBGJ6-ys_j0H4QL65VLqzI3wI.woff — 17.3 KiB — 375 ms — font-display: swaphttps://www.senate.gov/resources/fonts/toadOcfmlt9b38dHJxOBGFkQc6VGVFSmCnC_l7QZG60.wofftoadOcfmlt9b38dHJxOBGFk... https://www.senate.gov/resources/fonts/toadOcfmlt9b38dHJxOBGFkQc6VGVFSmCnC_l7QZG60.woff — 17.2 KiB — 396 ms — font-display: swaphttps://www.senate.gov/resources/fonts/M2Jd71oPJhLKp0zdtTvoMzNrcjQuD0pTu1za2FULaMs.woffM2Jd71oPJhLKp0zdtTvoMzN... https://www.senate.gov/resources/fonts/M2Jd71oPJhLKp0zdtTvoMzNrcjQuD0pTu1za2FULaMs.woff — 17.2 KiB — 450 ms — font-display: swap
ODelI1aHBYDBqgeIAH2zlBM... woff swap
Size 17 KB
Load time 289 ms
Start 960 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fontawesome-webfont.woff2 woff2 swap
Size 71 KB
Load time 342 ms
Start 961 ms
Risk FOUT — text flashes from fallback to web font
toadOcfmlt9b38dHJxOBGJ6... woff swap
Size 17 KB
Load time 375 ms
Start 962 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
toadOcfmlt9b38dHJxOBGFk... woff swap
Size 17 KB
Load time 396 ms
Start 962 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
M2Jd71oPJhLKp0zdtTvoMzN... woff swap
Size 17 KB
Load time 450 ms
Start 962 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~21 KB and ~42 ms

A+
JS Bundles
8 scripts, 0 KB unused
PASS
8 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.senate.gov/resources/scripts/respond.min.js2 KB—✓3rd
https://www.senate.gov/resources/scripts/jquery-1.11.3.min.js33 KB—✓3rd
https://www.senate.gov/resources/scripts/skdslider.min.js2 KB—✓3rd
https://www.senate.gov/resources/scripts/main.js1 KB—✓3rd
https://www.senate.gov/resources/scripts/floor_status.js1 KB—✓3rd
https://assets.adobedtm.com/566dc2d26e4f/843d2f589d53/launch-01bbfeb2a9a5.min.js40 KB—✓3rd
https://assets.adobedtm.com/extensions/EPbf7b42aa08bc4f10879b1484195e80d1/AppMeasurement.min.js12 KB—✓3rd
https://assets.adobedtm.com/extensions/EPbf7b42aa08bc4f10879b1484195e80d1/AppMeasurement_Module_ActivityMap.min.js2 KB—✓3rd
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+
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
50 requests over 1900ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.6 s LCP 12.8 shttps://senate.gov// https://senate.gov/ — 301 — 215 B — 94 ms — http/1.1https://www.senate.gov/www.senate.gov/ https://www.senate.gov/ — 200 — 8.5 KiB — 295 ms — http/1.1https://www.senate.gov/resources/styles/boilerplate.csswww.senate.gov/resources/styles/boi... https://www.senate.gov/resources/styles/boilerplate.css — 200 — 3.5 KiB — 99 ms — http/1.1https://www.senate.gov/resources/styles/main.csswww.senate.gov/resources/styles/mai... https://www.senate.gov/resources/styles/main.css — 200 — 7.6 KiB — 207 ms — http/1.1https://www.senate.gov/resources/styles/nav_menu.csswww.senate.gov/resources/styles/nav... https://www.senate.gov/resources/styles/nav_menu.css — 200 — 4.1 KiB — 289 ms — http/1.1https://www.senate.gov/resources/styles/skdslider.csswww.senate.gov/resources/styles/skd... https://www.senate.gov/resources/styles/skdslider.css — 200 — 1.9 KiB — 293 ms — http/1.1https://www.senate.gov/resources/fonts/gFonts.css?family=Source+Sans+Pro:400,300,600,700,300italic,400italic,600italic,700italicwww.senate.gov/resources/fonts/gFon... https://www.senate.gov/resources/fonts/gFonts.css?family=Source+Sans+Pro:400,300,600,700,300italic,400italic,600italic,700italic — 200 — 1.1 KiB — 295 ms — http/1.1https://www.senate.gov/resources/fonts/gFonts.css?family=Source+Serif+Pro:400,600,700www.senate.gov/resources/fonts/gFon... https://www.senate.gov/resources/fonts/gFonts.css?family=Source+Serif+Pro:400,600,700 — 200 — 1.1 KiB — 305 ms — http/1.1https://www.senate.gov/resources/fonts/gFonts.css?family=Libre+Baskerville:400,400italic,700www.senate.gov/resources/fonts/gFon... https://www.senate.gov/resources/fonts/gFonts.css?family=Libre+Baskerville:400,400italic,700 — 200 — 1.1 KiB — 303 ms — http/1.1https://www.senate.gov/resources/fonts/css/font-awesome.min.csswww.senate.gov/resources/fonts/css/... https://www.senate.gov/resources/fonts/css/font-awesome.min.css — 200 — 6.8 KiB — 309 ms — http/1.1https://www.senate.gov/resources/styles/print.csswww.senate.gov/resources/styles/pri... https://www.senate.gov/resources/styles/print.css — 200 — 1.0 KiB — 384 ms — http/1.1https://www.senate.gov/resources/scripts/respond.min.jswww.senate.gov/resources/scripts/re... https://www.senate.gov/resources/scripts/respond.min.js — 200 — 2.0 KiB — 390 ms — http/1.1https://www.senate.gov/resources/scripts/jquery-1.11.3.min.jswww.senate.gov/resources/scripts/jq... https://www.senate.gov/resources/scripts/jquery-1.11.3.min.js — 200 — 32.9 KiB — 494 ms — http/1.1https://www.senate.gov/resources/scripts/skdslider.min.jswww.senate.gov/resources/scripts/sk... https://www.senate.gov/resources/scripts/skdslider.min.js — 200 — 2.0 KiB — 409 ms — http/1.1https://www.senate.gov/resources/scripts/main.jswww.senate.gov/resources/scripts/ma... https://www.senate.gov/resources/scripts/main.js — 200 — 1.3 KiB — 409 ms — http/1.1https://www.senate.gov/resources/scripts/floor_status.jswww.senate.gov/resources/scripts/fl... https://www.senate.gov/resources/scripts/floor_status.js — 200 — 875 B — 408 ms — http/1.1https://www.senate.gov/resources/images/usFlag.pngwww.senate.gov/resources/images/usF... https://www.senate.gov/resources/images/usFlag.png — 200 — 17.1 KiB — 112 ms — http/1.1https://www.senate.gov/resources/images/senate_logo.pngwww.senate.gov/resources/images/sen... https://www.senate.gov/resources/images/senate_logo.png — 200 — 10.8 KiB — 102 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/1800_Capitol_Wing.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/1800_Capitol_Wing.jpg — 200 — 377.1 KiB — 470 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/OldSenateChamber_bannerimage.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/OldSenateChamber_bannerimage.jpg — 200 — 161.3 KiB — 330 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/bingham-modificationists-petition-1932-loc.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/bingham-modificationists-petition-1932-loc.jpg — 200 — 85.3 KiB — 227 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/Desks_slider_66_00019.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/Desks_slider_66_00019.jpg — 200 — 274.7 KiB — 468 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/States_homepageRotator.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/States_homepageRotator.jpg — 200 — 63.6 KiB — 236 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/women-of-the-senate-rotator-front-page.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/women-of-the-senate-rotator-front-page.jpg — 200 — 192.4 KiB — 419 ms — http/1.1https://assets.adobedtm.com/566dc2d26e4f/843d2f589d53/launch-01bbfeb2a9a5.min.jsassets.adobedtm.com/566dc2d26e4f/84... https://assets.adobedtm.com/566dc2d26e4f/843d2f589d53/launch-01bbfeb2a9a5.min.js — 200 — 40.5 KiB — 48 ms — h2https://www.senate.gov/resources/images/bkgnd_stripe_b.pngwww.senate.gov/resources/images/bkg... https://www.senate.gov/resources/images/bkgnd_stripe_b.png — 200 — 15.4 KiB — 499 ms — http/1.1https://www.senate.gov/resources/images/senate_logo_black.pngwww.senate.gov/resources/images/sen... https://www.senate.gov/resources/images/senate_logo_black.png — 200 — 10.3 KiB — 492 ms — http/1.1https://www.senate.gov/resources/images/banner-bg.pngwww.senate.gov/resources/images/ban... https://www.senate.gov/resources/images/banner-bg.png — 200 — 24.0 KiB — 523 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/Slider_inauguration_38_00152_001.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/Slider_inauguration_38_00152_001.jpg — 200 — 472.6 KiB — 624 ms — http/1.1https://www.senate.gov/resources/fonts/ODelI1aHBYDBqgeIAH2zlBM0YzuT7MdOe03otPbuUS0.woffwww.senate.gov/resources/fonts/ODel... https://www.senate.gov/resources/fonts/ODelI1aHBYDBqgeIAH2zlBM0YzuT7MdOe03otPbuUS0.woff — 200 — 17.4 KiB — 289 ms — http/1.1
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.6 s LCP 12.8 shttps://senate.gov// https://senate.gov/ — 301 — 215 B — 94 ms — http/1.1https://www.senate.gov/www.senate.gov/ https://www.senate.gov/ — 200 — 8.5 KiB — 295 ms — http/1.1https://www.senate.gov/resources/styles/boilerplate.csswww.senate.gov/resources/styles/boi... https://www.senate.gov/resources/styles/boilerplate.css — 200 — 3.5 KiB — 99 ms — http/1.1https://www.senate.gov/resources/styles/main.csswww.senate.gov/resources/styles/mai... https://www.senate.gov/resources/styles/main.css — 200 — 7.6 KiB — 207 ms — http/1.1https://www.senate.gov/resources/styles/nav_menu.csswww.senate.gov/resources/styles/nav... https://www.senate.gov/resources/styles/nav_menu.css — 200 — 4.1 KiB — 289 ms — http/1.1https://www.senate.gov/resources/styles/skdslider.csswww.senate.gov/resources/styles/skd... https://www.senate.gov/resources/styles/skdslider.css — 200 — 1.9 KiB — 293 ms — http/1.1https://www.senate.gov/resources/fonts/gFonts.css?family=Source+Sans+Pro:400,300,600,700,300italic,400italic,600italic,700italicwww.senate.gov/resources/fonts/gFon... https://www.senate.gov/resources/fonts/gFonts.css?family=Source+Sans+Pro:400,300,600,700,300italic,400italic,600italic,700italic — 200 — 1.1 KiB — 295 ms — http/1.1https://www.senate.gov/resources/fonts/gFonts.css?family=Source+Serif+Pro:400,600,700www.senate.gov/resources/fonts/gFon... https://www.senate.gov/resources/fonts/gFonts.css?family=Source+Serif+Pro:400,600,700 — 200 — 1.1 KiB — 305 ms — http/1.1https://www.senate.gov/resources/fonts/gFonts.css?family=Libre+Baskerville:400,400italic,700www.senate.gov/resources/fonts/gFon... https://www.senate.gov/resources/fonts/gFonts.css?family=Libre+Baskerville:400,400italic,700 — 200 — 1.1 KiB — 303 ms — http/1.1https://www.senate.gov/resources/fonts/css/font-awesome.min.csswww.senate.gov/resources/fonts/css/... https://www.senate.gov/resources/fonts/css/font-awesome.min.css — 200 — 6.8 KiB — 309 ms — http/1.1https://www.senate.gov/resources/styles/print.csswww.senate.gov/resources/styles/pri... https://www.senate.gov/resources/styles/print.css — 200 — 1.0 KiB — 384 ms — http/1.1https://www.senate.gov/resources/scripts/respond.min.jswww.senate.gov/resources/scripts/re... https://www.senate.gov/resources/scripts/respond.min.js — 200 — 2.0 KiB — 390 ms — http/1.1https://www.senate.gov/resources/scripts/jquery-1.11.3.min.jswww.senate.gov/resources/scripts/jq... https://www.senate.gov/resources/scripts/jquery-1.11.3.min.js — 200 — 32.9 KiB — 494 ms — http/1.1https://www.senate.gov/resources/scripts/skdslider.min.jswww.senate.gov/resources/scripts/sk... https://www.senate.gov/resources/scripts/skdslider.min.js — 200 — 2.0 KiB — 409 ms — http/1.1https://www.senate.gov/resources/scripts/main.jswww.senate.gov/resources/scripts/ma... https://www.senate.gov/resources/scripts/main.js — 200 — 1.3 KiB — 409 ms — http/1.1https://www.senate.gov/resources/scripts/floor_status.jswww.senate.gov/resources/scripts/fl... https://www.senate.gov/resources/scripts/floor_status.js — 200 — 875 B — 408 ms — http/1.1https://www.senate.gov/resources/images/usFlag.pngwww.senate.gov/resources/images/usF... https://www.senate.gov/resources/images/usFlag.png — 200 — 17.1 KiB — 112 ms — http/1.1https://www.senate.gov/resources/images/senate_logo.pngwww.senate.gov/resources/images/sen... https://www.senate.gov/resources/images/senate_logo.png — 200 — 10.8 KiB — 102 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/1800_Capitol_Wing.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/1800_Capitol_Wing.jpg — 200 — 377.1 KiB — 470 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/OldSenateChamber_bannerimage.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/OldSenateChamber_bannerimage.jpg — 200 — 161.3 KiB — 330 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/bingham-modificationists-petition-1932-loc.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/bingham-modificationists-petition-1932-loc.jpg — 200 — 85.3 KiB — 227 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/Desks_slider_66_00019.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/Desks_slider_66_00019.jpg — 200 — 274.7 KiB — 468 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/States_homepageRotator.jpgwww.senate.gov/resources/images/sli... https://www.senate.gov/resources/images/sliderphotos/States_homepageRotator.jpg — 200 — 63.6 KiB — 236 ms — http/1.1https://www.senate.gov/resources/images/sliderphotos/women-of-the-senate-rotator-front-page.jpgwww.senate.gov/resources/images/sli... 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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 777ms · 82KB · $10/mo
Unattributable
Other
Costly
Execution 291ms
Transfer 0 KB
Monthly Cost $4/mo
www.senate.gov
Other
Costly
Execution 234ms
Transfer 33 KB
Monthly Cost $3/mo
assets.adobedtm.com
Other
Optional
Execution 165ms
Transfer 40 KB
Monthly Cost $2/mo
www.senate.gov
Other
Optional
Execution 86ms
Transfer 8 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 291ms and costs ~$4/month
  • www.senate.gov adds 234ms and costs ~$3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 291ms 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.senate.gov takes 234ms 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

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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