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https://transportation.gov

Performance

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

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

Mobile Desktop
32
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.
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.

6.41 s

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

25.40 s

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

1.54 s

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

0.000

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

7.18 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.

26.06 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
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.2 MB transferred, 80 requests
FIX
5.2 MB transferred, 80 requests
Critical::
Page weighs 8.6 MB (5.2 MB transferred)
Warning::
Images are 3.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.4 MB
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 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::
80 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.2 MB / 2.4 MB budget
5.2 MB transferred
80 requests
1.1 g CO2 per page load
Images 3.4 MiB 65%
JavaScript 1.2 MiB 23%
Fonts 400.2 KiB 7%
CSS 181.1 KiB 3%
Other 19.1 KiB 0%
HTML 17.2 KiB 0%
Other 1.7 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 (5.2 MiB of 5.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3996ms total JS execution
FIX
3996ms total JS execution
Warning::
https://www.google-analytics.com/analytics.js: 781ms CPU time
Warning::
Unattributable: 701ms CPU time
Warning::
https://www.transportation.gov/sites/dot.gov/files...: 418ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 297ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HF5V...: 286ms CPU time
Warning::
Third-party scripts: 3996ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Style & Layout 22% Other 16% Script Parsing & Compilation 11% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.google-analytics.com/analytics.js781ms66ms21ms3rd
Unattributable701ms82ms0ms3rd
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_qjrs418ms258ms34ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L297ms210ms56ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HF5V26MT25&cx=c&gtm=4e64h1286ms224ms60ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0623JYSC1Q&cx=c&gtm=4e64h1269ms216ms51ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NQ5ZN114SB&cx=c&gtm=4e64h1233ms175ms56ms3rd
https://www.transportation.gov/222ms8ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-18660041-1204ms149ms39ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-33523145-1&cx=c&gtm=4e64h1162ms120ms41ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
22 scripts, 585 KB unused
FIX
22 scripts, 585 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: 585 KB
585 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/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.transportation.gov36 KB25 KB (70%)✓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
80 resources · 5.2 MB · 585 KB savings available
FIX
80 resources · 5.2 MB · 585 KB savings available
Warning::
Page weight 4.2 MB over 1MB target
Got: 5.2 MB Expected: ≤ 1 MB
Info::
~585 KB of savings available
Warning::
79 third-party resources (100% of weight)
Info::
4 resources over 200KB
80 resources · 5.2 MiB · 79 third-party 4.2 MiB over 1MB target
Image 66% · 3.4 MiB
JavaScript 23% · 1.2 MiB
Font 7% · 400.2 KiB
CSS 3% · 181.1 KiB
Document 0% · 17.2 KiB
Other 0% · 2.3 KiB

~584.5 KiB of savings available

Remove unused JavaScript: 584.5 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
32 images, 0 KB saveable
REVIEW
32 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/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.
32 images 3.4 MB
0 oversized -0 KB
29 legacy format
15 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

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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 6.4 s LCP 25.4 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 7 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/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2S6u9w4BMUTPHh6UVSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 13.9 KiB — 16 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 — 8 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 — 13 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 — 25 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 — 12 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 — 23 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 7 ms
Start 578 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 25 ms
Start 579 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 16 ms
Start 579 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 8 ms
Start 579 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 13 ms
Start 580 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 115 KB
Load time 25 ms
Start 580 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
fa-solid-900.woff2 woff2 swap
Size 73 KB
Load time 12 ms
Start 686 ms
Risk FOUT — text flashes from fallback to web font
slick.woff woff swap
Size 1 KB
Load time 23 ms
Start 804 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 ~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
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
80 requests over 2423ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 6.4 s LCP 25.4 shttps://transportation.gov// https://transportation.gov/ — 302 — 134 B — 154 ms — http/1.0https://www.transportation.gov/www.transportation.gov/ https://www.transportation.gov/ — 200 — 17.2 KiB — 30 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 — 69 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 — 38.0 KiB — 35 ms — 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h3https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2fonts.gstatic.com/s/sourcesanspro/v... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 200 — 14.5 KiB — 7 ms — h3https://use.fontawesome.com/releases/v6.5.1/webfonts/fa-solid-900.woff2use.fontawesome.com/releases/v6.5.1... https://use.fontawesome.com/releases/v6.5.1/webfonts/fa-solid-900.woff2 — 200 — 153.3 KiB — 25 ms — h2https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2fonts.gstatic.com/s/lato/v25/S6u9w4... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 200 — 13.9 KiB — 16 ms — h3https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2fonts.gstatic.com/s/sourcesanspro/v... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 200 — 14.4 KiB — 8 ms — h3https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2fonts.gstatic.com/s/sourcesanspro/v... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3i54rwlxdu3cOWxw.woff2 — 200 — 14.6 KiB — 13 ms — h3https://use.fontawesome.com/releases/v6.5.1/webfonts/fa-brands-400.woff2use.fontawesome.com/releases/v6.5.1... https://use.fontawesome.com/releases/v6.5.1/webfonts/fa-brands-400.woff2 — 200 — 115.1 KiB — 25 ms — h2https://www.transportation.gov/sites/dot.gov/files/2020-02/incoming-plane.jpgwww.transportation.gov/sites/dot.go... https://www.transportation.gov/sites/dot.gov/files/2020-02/incoming-plane.jpg — 200 — 132.8 KiB — 213 ms — h3https://use.fontawesome.com/releases/v5.8.2/webfonts/fa-solid-900.woff2use.fontawesome.com/releases/v5.8.2... https://use.fontawesome.com/releases/v5.8.2/webfonts/fa-solid-900.woff2 — 200 — 73.0 KiB — 12 ms — 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h3https://www.transportation.gov/purge-ajax-processorwww.transportation.gov/purge-ajax-p... https://www.transportation.gov/purge-ajax-processor — 200 — 68 B — 64 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-NQ5ZN114SB&gtm=45je64h1v888840101za20g&_p=1776810799049&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&_eu=AAAI&are=1&cid=299440080.1776810799&frm=0&pscdl=noapi&rcb=19&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117512542~117884344~118463261&sid=1776810799&sct=1&seg=0&dl=https%3A%2F%2Fwww.transportation.gov%2F&dt=Department%20of%20Transportation&_tu=QA&en=page_view&_fv=1&_ss=1&tfd=958www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-NQ5ZN114SB&gtm=45je64h1v888840101za20g&_p=1776810799049&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&_eu=AAAI&are=1&cid=299440080.1776810799&frm=0&pscdl=noapi&rcb=19&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117512542~117884344~118463261&sid=1776810799&sct=1&seg=0&dl=https%3A%2F%2Fwww.transportation.gov%2F&dt=Department%20of%20Transportation&_tu=QA&en=page_view&_fv=1&_ss=1&tfd=958 — 204 — 412 B — 76 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-HF5V26MT25&gtm=45je64h1v885139735za200&_p=1776810799049&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&ecid=56404181&are=1&cid=299440080.1776810799&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401~117512542&sid=1776810799&sct=1&seg=0&dl=https%3A%2F%2Fwww.transportation.gov%2F&dt=Department%20of%20Transportation&en=page_view&_fv=1&_ss=1&_ee=1&ep.page_placeholder=PLACEHOLDER_page_location&tfd=1030www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-HF5V26MT25&gtm=45je64h1v885139735za200&_p=1776810799049&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&ecid=56404181&are=1&cid=299440080.1776810799&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401~117512542&sid=1776810799&sct=1&seg=0&dl=https%3A%2F%2Fwww.transportation.gov%2F&dt=Department%20of%20Transportation&en=page_view&_fv=1&_ss=1&_ee=1&ep.page_placeholder=PLACEHOLDER_page_location&tfd=1030 — 204 — 20 B — 79 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200&_p=1776810799049&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&are=1&cid=299440080.1776810799&frm=0&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401~117512542&dl=https%3A%2F%2Ftransportation.gov%2F&dt=Department%20of%20Transportation&dr=&sid=1776810799&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=DOT&ep.subagency=TRANSPORTATION.GOV&ep.site_topic=unspecified%3Atransportation.gov&ep.site_platform=unspecified%3Atransportation.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=transportation.gov&tfd=1107www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200&_p=1776810799049&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&are=1&cid=299440080.1776810799&frm=0&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401~117512542&dl=https%3A%2F%2Ftransportation.gov%2F&dt=Department%20of%20Transportation&dr=&sid=1776810799&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=DOT&ep.subagency=TRANSPORTATION.GOV&ep.site_topic=unspecified%3Atransportation.gov&ep.site_platform=unspecified%3Atransportation.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=transportation.gov&tfd=1107 — 204 — 20 B — 23 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-0623JYSC1Q&gtm=45je64h1v9108484058za200&_p=1776810799049&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&are=1&cid=299440080.1776810799&frm=0&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512542~118128922&sid=1776810800&sct=1&seg=0&dl=https%3A%2F%2Fwww.transportation.gov%2F&dt=Department%20of%20Transportation&en=page_view&_fv=1&_ss=1&_ee=1&ep.page_placeholder=PLACEHOLDER_page_location&tfd=1194www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-0623JYSC1Q&gtm=45je64h1v9108484058za200&_p=1776810799049&gcd=13l3l3l3l1l1&npa=0&dma=0&gdid=dMDhkMT&are=1&cid=299440080.1776810799&frm=0&pscdl=noapi&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512542~118128922&sid=1776810800&sct=1&seg=0&dl=https%3A%2F%2Fwww.transportation.gov%2F&dt=Department%20of%20Transportation&en=page_view&_fv=1&_ss=1&_ee=1&ep.page_placeholder=PLACEHOLDER_page_location&tfd=1194 — 204 — 20 B — 38 ms — h3https://zn39q5jmtqsq6dzmj-dotocio.gov1.siteintercept.qualtrics.com/SIE/?Q_ZID=ZN_39Q5jmtqsQ6DzmJ&t=1776810800049zn39q5jmtqsq6dzmj-dotocio.gov1.site... https://zn39q5jmtqsq6dzmj-dotocio.gov1.siteintercept.qualtrics.com/SIE/?Q_ZID=ZN_39Q5jmtqsQ6DzmJ&t=1776810800049 — 200 — 4.8 KiB — 196 ms — h2https://www.transportation.gov/akam/13/pixel_40e1ef69www.transportation.gov/akam/13/pixe... https://www.transportation.gov/akam/13/pixel_40e1ef69 — 200 — 19 B — 31 ms — h3https://www.transportation.gov/themes/custom/transpo/favicon_dot.pngwww.transportation.gov/themes/custo... https://www.transportation.gov/themes/custom/transpo/favicon_dot.png — 200 — 19.0 KiB — 68 ms — h3https://gov1.siteintercept.qualtrics.com/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.transportation.govgov1.siteintercept.qualtrics.com/dx... https://gov1.siteintercept.qualtrics.com/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.transportation.gov — 200 — 19.2 KiB — 861 ms — h2https://gov1.siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.transportation.govgov1.siteintercept.qualtrics.com/dx... https://gov1.siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.transportation.gov — 200 — 36.5 KiB — 834 ms — h2https://gov1.siteintercept.qualtrics.com/WRSiteInterceptEngine/Targeting.php?Q_ZoneID=ZN_39Q5jmtqsQ6DzmJ&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=webgov1.siteintercept.qualtrics.com/WR... https://gov1.siteintercept.qualtrics.com/WRSiteInterceptEngine/Targeting.php?Q_ZoneID=ZN_39Q5jmtqsQ6DzmJ&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web — 200 — 1.7 KiB — 138 ms — h2
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 3996ms · 1146KB · $53/mo
Google Analytics
Analytics
Costly
Execution 781ms
Transfer 21 KB
Monthly Cost $10/mo
Unattributable
Other
Costly
Execution 701ms
Transfer 0 KB
Monthly Cost $9/mo
www.transportation.gov
Other
Costly
Execution 418ms
Transfer 84 KB
Unused 58%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 297ms
Transfer 147 KB
Unused 43%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 286ms
Transfer 153 KB
Unused 42%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 269ms
Transfer 156 KB
Unused 43%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 233ms
Transfer 156 KB
Unused 40%
Monthly Cost $3/mo
www.transportation.gov
Other
Costly
Execution 222ms
Transfer 17 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 204ms
Transfer 117 KB
Unused 53%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 162ms
Transfer 116 KB
Unused 55%
Monthly Cost $2/mo
www.transportation.gov
Other
Optional
Execution 143ms
Transfer 9 KB
Monthly Cost $2/mo
dap.digitalgov.gov
Other
Optional
Execution 114ms
Transfer 4 KB
Monthly Cost $2/mo
gov1.siteintercept.qualtrics.com
Other
Optional
Execution 90ms
Transfer 19 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 76ms
Transfer 147 KB
Unused 72%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Google Analytics adds 781ms and costs ~$10/month
  • Unattributable adds 701ms and costs ~$9/month
  • www.transportation.gov adds 418ms and costs ~$6/month
  • Google Tag Manager adds 297ms and costs ~$4/month
  • Google Tag Manager adds 286ms and costs ~$4/month
  • Google Tag Manager adds 269ms and costs ~$4/month
  • Google Tag Manager adds 233ms and costs ~$3/month
  • www.transportation.gov adds 222ms and costs ~$3/month
  • Google Tag Manager adds 204ms 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

Google Analytics takes 781ms 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 701ms 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.transportation.gov takes 418ms 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

Google Tag Manager takes 297ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

Google Tag Manager takes 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

Google Tag Manager takes 269ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

Google Tag Manager takes 233ms 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.transportation.gov takes 222ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

Google Tag Manager takes 204ms 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

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

55% 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

72% 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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