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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.54 s

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

2.69 s

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

32 ms

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

0.001

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

1.54 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.

2.91 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
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
5.3 MB transferred, 89 requests
FIX
5.3 MB transferred, 89 requests
Critical::
Page weighs 8.8 MB (5.3 MB transferred)
Warning::
Images are 3.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.5 MB
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
Fonts are 400 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 400 KB
Info::
89 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.3 MB / 2.4 MB budget
5.3 MB transferred
89 requests
1.1 g CO2 per page load
Images 3.5 MiB 65%
JavaScript 1.3 MiB 24%
Fonts 400.1 KiB 7%
CSS 181.1 KiB 3%
Other 19.3 KiB 0%
HTML 17.2 KiB 0%
Other 5.2 KiB 0%
Other 472 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Why this matters

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

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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 (5.3 MiB of 5.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
26 scripts, 603 KB unused
FIX
26 scripts, 603 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 106 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0623...: 67 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HF5V...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-335...: 64 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NQ5Z...: 63 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 603 KB
603 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0623JYSC1Q&cx=c&gtm=4e64h1156 KB67 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HF5V26MT25&cx=c&gtm=4e64h1153 KB65 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-33523145-1&cx=c&gtm=4e64h1116 KB64 KB (55%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NQ5ZN114SB&cx=c&gtm=4e64h1156 KB63 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-18660041-1117 KB62 KB (53%)✓3rd
https://www.transportation.gov/sites/dot.gov/files/js/js_4_6sU2G5ICngBZeS4_6eFbc6EXpc0TxEgfq5MtFECPA.js?scope=footer&delta=0&language=en&theme=transpo&include=eJxdUFGuwyAMuxAbR0KBMsTmEpRQbd3pl_VR6Wk_lm2S4CSC3ruPX3QH-gRSRdUxNZiWSTtjv1XglMJr1TyV0G2yZ47dReahQ6gH1Cgk9snpuMQAda0RnB4-sWS38AhpVV_AkXDRsaO24vKrU1vCbMiBAP_nXU7PaobVPvwiWydcp3SFucA6GmEfNdnoH8P1TYrpO72CrZKyKosfUkvJEo5HZ4ewhAdeM-k30n_ruI2t1LTzb_QNo665bf4kHz_qjrs84 KB49 KB (58%)✓3rd
https://gov1.siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=dotocio32 KB22 KB (73%)✓3rd
https://www.transportation.gov/sites/dot.gov/files/js/js_oQ1_vNDnKkOlwPYNL611aNqxALicHYiWnGgHBp6Emi0.js?scope=footer&delta=3&language=en&theme=transpo&include=eJxdUFGuwyAMuxAbR0KBMsTmEpRQbd3pl_VR6Wk_lm2S4CSC3ruPX3QH-gRSRdUxNZiWSTtjv1XglMJr1TyV0G2yZ47dReahQ6gH1Cgk9snpuMQAda0RnB4-sWS38AhpVV_AkXDRsaO24vKrU1vCbMiBAP_nXU7PaobVPvwiWydcp3SFucA6GmEfNdnoH8P1TYrpO72CrZKyKosfUkvJEo5HZ4ewhAdeM-k30n_ruI2t1LTzb_QNo665bf4kHz_qjrs27 KB22 KB (81%)✓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
89 resources · 5.3 MB · 603 KB savings available
FIX
89 resources · 5.3 MB · 603 KB savings available
Warning::
Page weight 4.3 MB over 1MB target
Got: 5.3 MB Expected: ≤ 1 MB
Info::
~603 KB of savings available
Warning::
88 third-party resources (100% of weight)
Info::
4 resources over 200KB
89 resources · 5.3 MiB · 88 third-party 4.3 MiB over 1MB target
Image 65% · 3.5 MiB
JavaScript 24% · 1.3 MiB
Font 7% · 400.1 KiB
CSS 3% · 181.1 KiB
Document 0% · 17.2 KiB
Other 0% · 5.9 KiB

~603.2 KiB of savings available

Remove unused JavaScript: 603.2 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/sites/dot.gov/files... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/dot_c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.transportation.gov/themes/custom/trans... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 3.5 MB
0 oversized -0 KB
31 legacy format
16 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

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

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
1138ms total JS execution
REVIEW
1138ms total JS execution
Warning::
https://www.transportation.gov/: 318ms CPU time
Warning::
Unattributable: 286ms CPU time
Info::
https://www.transportation.gov/sites/dot.gov/files...: 126ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HF5V...: 78ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 76ms CPU time
Warning::
Third-party scripts: 1138ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Style & Layout 22% Other 21% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.transportation.gov/318ms3ms1ms3rd
Unattributable286ms25ms0ms3rd
https://www.transportation.gov/sites/dot.gov/files/js/js_4_6sU2G5ICngBZeS4_6eFbc6EXpc0TxEgfq5MtFECPA.js?scope=footer&delta=0&language=en&theme=transpo&include=eJxdUFGuwyAMuxAbR0KBMsTmEpRQbd3pl_VR6Wk_lm2S4CSC3ruPX3QH-gRSRdUxNZiWSTtjv1XglMJr1TyV0G2yZ47dReahQ6gH1Cgk9snpuMQAda0RnB4-sWS38AhpVV_AkXDRsaO24vKrU1vCbMiBAP_nXU7PaobVPvwiWydcp3SFucA6GmEfNdnoH8P1TYrpO72CrZKyKosfUkvJEo5HZ4ewhAdeM-k30n_ruI2t1LTzb_QNo665bf4kHz_qjrs126ms76ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HF5V26MT25&cx=c&gtm=4e64h178ms66ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L76ms65ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0623JYSC1Q&cx=c&gtm=4e64h173ms60ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-18660041-163ms46ms11ms3rd
https://www.transportation.gov/akam/13/3faf04d861ms55ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NQ5ZN114SB&cx=c&gtm=4e64h157ms45ms11ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
8 fonts (400 KB)
PASS
8 fonts (400 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

400 KB total

Render-blocking

0

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.5 s LCP 2.7 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 6 ms — font-display: swaphttps://use.fontawesome.com/releases/v6.5.1/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://use.fontawesome.com/releases/v6.5.1/webfonts/fa-solid-900.woff2 — 153.3 KiB — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2 — 14.6 KiB — 17 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 23 ms — font-display: swaphttps://use.fontawesome.com/releases/v6.5.1/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://use.fontawesome.com/releases/v6.5.1/webfonts/fa-brands-400.woff2 — 115.1 KiB — 24 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2S6u9w4BMUTPHh6UVSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 13.9 KiB — 18 ms — font-display: swaphttps://use.fontawesome.com/releases/v5.8.2/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://use.fontawesome.com/releases/v5.8.2/webfonts/fa-solid-900.woff2 — 73.0 KiB — 16 ms — font-display: swaphttps://www.transportation.gov/libraries/slick-carousel/slick/fonts/slick.woffslick.woff https://www.transportation.gov/libraries/slick-carousel/slick/fonts/slick.woff — 1.4 KiB — 16 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 6 ms
Start 885 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 25 ms
Start 886 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 17 ms
Start 886 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 23 ms
Start 886 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 115 KB
Load time 24 ms
Start 888 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
S6u9w4BMUTPHh6UVSwiPGQ3... woff2 swap
Size 14 KB
Load time 18 ms
Start 889 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 73 KB
Load time 16 ms
Start 970 ms
Risk FOUT — text flashes from fallback to web font
slick.woff woff swap
Size 1 KB
Load time 16 ms
Start 1.2 s
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 ~135 KB and ~270 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
89 requests over 2832ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.5 s LCP 2.7 shttps://dot.gov// https://dot.gov/ — 302 — 123 B — 257 ms — http/1.0https://www.dot.gov/www.dot.gov/ https://www.dot.gov/ — 301 — 140 B — 28 ms — h2https://www.transportation.gov/www.transportation.gov/ https://www.transportation.gov/ — 200 — 17.2 KiB — 35 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-18660041-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-18660041-1 — 200 — 116.9 KiB — 170 ms — h2https://www.transportation.gov/sites/dot.gov/files/css/css_WneJwf3QlBjcb92NQ0TcgZack3JlBKrLehKuffEBQuo.css?delta=0&language=en&theme=transpo&include=eJx1kVFywyAMRC9E4afNdRgBsq1GRgzCSdzT13Ybx8m0P0L7YBa0BIav2fWVkglbywKJcm-CSNNWofgAtZK4LAkPlClUqLPbiYlnTNSkesoJcwss8ewOvYnCDEXpZydKRbMWl-pUgC18ws0kaT6O6jrJDa6oMqI_7bRnCcBv2mZe34i3tqznu8GvXHEF3xFy8gk1ViqNJLt_uI-qpkCFfpli0Lvbg9gplykw6YDpcNCvqbkXbfc83o0yLXNu1a53HPUIlK0WpvaE24AjGp214egCKJrFKmuRp0A-_qSnnb7ENHGjEfPkIlRsdvlOuT7gloo-tHRdhHwBtRqBkbK5EF7VbdWOkibGb4hP3howww.transportation.gov/sites/dot.go... https://www.transportation.gov/sites/dot.gov/files/css/css_WneJwf3QlBjcb92NQ0TcgZack3JlBKrLehKuffEBQuo.css?delta=0&language=en&theme=transpo&include=eJx1kVFywyAMRC9E4afNdRgBsq1GRgzCSdzT13Ybx8m0P0L7YBa0BIav2fWVkglbywKJcm-CSNNWofgAtZK4LAkPlClUqLPbiYlnTNSkesoJcwss8ewOvYnCDEXpZydKRbMWl-pUgC18ws0kaT6O6jrJDa6oMqI_7bRnCcBv2mZe34i3tqznu8GvXHEF3xFy8gk1ViqNJLt_uI-qpkCFfpli0Lvbg9gplykw6YDpcNCvqbkXbfc83o0yLXNu1a53HPUIlK0WpvaE24AjGp214egCKJrFKmuRp0A-_qSnnb7ENHGjEfPkIlRsdvlOuT7gloo-tHRdhHwBtRqBkbK5EF7VbdWOkibGb4hP3ho — 200 — 37.9 KiB — 32 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1138ms · 838KB · $15/mo
www.transportation.gov
Other
Costly
Execution 318ms
Transfer 17 KB
Monthly Cost $4/mo
Unattributable
Other
Costly
Execution 286ms
Transfer 0 KB
Monthly Cost $4/mo
www.transportation.gov
Other
Optional
Execution 126ms
Transfer 84 KB
Unused 58%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 153 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 76ms
Transfer 147 KB
Unused 43%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 156 KB
Unused 43%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 117 KB
Unused 53%
Monthly Cost $1/mo
www.transportation.gov
Other
Optional
Execution 61ms
Transfer 9 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 156 KB
Unused 40%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.transportation.gov adds 318ms and costs ~$4/month
  • Unattributable adds 286ms 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.transportation.gov takes 318ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 286ms 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

58% of www.transportation.gov'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

53% 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

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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