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https://doi.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.80 s

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

9.73 s

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

301 ms

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.

5.90 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.

9.75 s

Page Load Progression

581 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s
4.1 s
4.6 s
Checks
17
7 PASS 5 REVIEW 3 FIX
F
Page Weight Budget
Action
18.0 MB transferred, 49 requests
FIX
18.0 MB transferred, 49 requests
Critical::
Page weighs 20.4 MB (18.0 MB transferred)
Warning::
JavaScript is 549 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 549 KB
Info::
CSS is 211 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 211 KB
Info::
49 HTTP requests
Info::
Estimated 3.8 g CO2 per page load
18.0 MB / 2.4 MB budget
18.0 MB transferred
49 requests
3.8 g CO2 per page load
Other 16.7 MiB 93%
JavaScript 548.8 KiB 3%
Images 527.5 KiB 3%
CSS 210.6 KiB 1%
Fonts 64.0 KiB 0%
HTML 10.6 KiB 0%
Other 3.0 KiB 0%
Other 837 B 0%
Other 556 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (18.0 MiB of 18.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
49 resources · 18.0 MB · 252 KB savings available
FIX
49 resources · 18.0 MB · 252 KB savings available
Warning::
Page weight 17.0 MB over 1MB target
Got: 18.0 MB Expected: ≤ 1 MB
Info::
~252 KB of savings available
Warning::
48 third-party resources (100% of weight)
Info::
2 resources over 200KB
49 resources · 18.0 MiB · 48 third-party 17.0 MiB over 1MB target
Media 93% · 16.7 MiB
JavaScript 3% · 548.8 KiB
Image 3% · 530.4 KiB
CSS 1% · 210.6 KiB
Font 0% · 64.0 KiB
Document 0% · 10.6 KiB
Other 0% · 1.5 KiB

~252.5 KiB of savings available

Remove unused JavaScript: 252.5 KiB
C
Image Optimization
Action
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://www.doi.gov/themes/custom/doi_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.gov/themes/custom/doi_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.gov/themes/custom/doi_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.gov/themes/custom/doi_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.gov/themes/custom/doi_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.gov/themes/custom/doi_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.gov/themes/custom/doi_uswds/logo.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 528 KB
0 oversized -0 KB
23 legacy format
7 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

C
JS Execution Cost
Action
1968ms total JS execution
REVIEW
1968ms total JS execution
Warning::
Unattributable: 689ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-44JE...: 325ms CPU time
Info::
https://www.doi.gov/sites/default/files/js/js_HbVO...: 190ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 187ms CPU time
Info::
https://www.doi.gov/sites/default/files/css/css_ax...: 112ms CPU time
Warning::
Third-party scripts: 1968ms (100% of total)

Main Thread Breakdown

Other 38% Script Evaluation 36% Style & Layout 13% Script Parsing & Compilation 6% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
Unattributable689ms9ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-44JE7ECGDQ325ms198ms35ms3rd
https://www.doi.gov/sites/default/files/js/js_HbVO93xFmTngqPzGzbcYYwV1HczZH4b8GQypPo2yPfQ.js?scope=footer&delta=5&language=en&theme=doi_uswds&include=eJx9ikEOgDAIwD6k7kkLGbgQJxhAjb_XeJg3b23TshByqGUoRQ1ZJXWaZlMJEhxQOYNAu4KLp8fGblNVrY2-8Ds7B_G6mR70fruf6AncKfwG_982-A190ms37ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L187ms153ms33ms3rd
https://www.doi.gov/sites/default/files/css/css_axAsl9e42tdSRgsYhOkmZKl4e0rljYaLwz4LVc8w9_I.css?delta=1&language=en&theme=doi_uswds&include=eJxFyEEKwzAMBdELGetIQbGURtSxjL7V0NsXumg3w2PaU8WWx8ateYj5oJ_qET6WDinitiVuATGgC2Vy8CN4niCJnNzr_9QcM_duOFUK3lh60c7Q8jK9Qd_WyyW7fgBmCDHP112ms0ms0ms3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOI104ms99ms3ms3rd
https://www.doi.gov/103ms8ms1ms3rd
https://www.doi.gov/sites/default/files/js/js_D-_GXQgxcRG49fq_EHLl4oBiGt0dT3WrISvzi2eWPNw.js?scope=footer&delta=0&language=en&theme=doi_uswds&include=eJx9ikEOgDAIwD6k7kkLGbgQJxhAjb_XeJg3b23TshByqGUoRQ1ZJXWaZlMJEhxQOYNAu4KLp8fGblNVrY2-8Ds7B_G6mR70fruf6AncKfwG_982-A84ms73ms7ms3rd
https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js69ms66ms1ms3rd
https://siteimproveanalytics.com/js/siteanalyze_76378.js54ms36ms3ms3rd

Showing top 10 of 11 scripts

C
JS Bundles
Action
12 scripts, 252 KB unused
REVIEW
12 scripts, 252 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-44JE...: 63 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.doi.gov/sites/default/files/js/js_HbVO...: 21 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 252 KB
252 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k0147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-44JE7ECGDQ156 KB63 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.doi.gov/sites/default/files/js/js_HbVO93xFmTngqPzGzbcYYwV1HczZH4b8GQypPo2yPfQ.js?scope=footer&delta=5&language=en&theme=doi_uswds&include=eJx9ikEOgDAIwD6k7kkLGbgQJxhAjb_XeJg3b23TshByqGUoRQ1ZJXWaZlMJEhxQOYNAu4KLp8fGblNVrY2-8Ds7B_G6mR70fruf6AncKfwG_982-A34 KB21 KB (61%)✓3rd
https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOI9 KB—✓3rd
https://www.doi.gov/sites/default/files/js/js_D-_GXQgxcRG49fq_EHLl4oBiGt0dT3WrISvzi2eWPNw.js?scope=footer&delta=0&language=en&theme=doi_uswds&include=eJx9ikEOgDAIwD6k7kkLGbgQJxhAjb_XeJg3b23TshByqGUoRQ1ZJXWaZlMJEhxQOYNAu4KLp8fGblNVrY2-8Ds7B_G6mR70fruf6AncKfwG_982-A32 KB—✓3rd
https://www.doi.gov/modules/contrib/ckeditor_accordion/js/accordion.frontend.min.js?tdujg42 KB—✓3rd
https://cdn.jsdelivr.net/npm/js-cookie@3.0.5/dist/js.cookie.min.js1 KB—✓3rd
https://www.doi.gov/sites/default/files/js/js_ieEz82G4sqWkOIpTj8ej9Cziqf28TUE-xXKCUW8oaGg.js?scope=footer&delta=3&language=en&theme=doi_uswds&include=eJx9ikEOgDAIwD6k7kkLGbgQJxhAjb_XeJg3b23TshByqGUoRQ1ZJXWaZlMJEhxQOYNAu4KLp8fGblNVrY2-8Ds7B_G6mR70fruf6AncKfwG_982-A2 KB—✓3rd
https://www.doi.gov/modules/custom/doi_analytics/assets/js/doi-siteimprove.js?v=1.x1 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

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

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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
2 fonts (64 KB)
PASS
2 fonts (64 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

64 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.8 s LCP 9.7 shttps://www.doi.gov/themes/custom/doi_uswds/assets/fonts/public-sans/PublicSans-Regular.woff2PublicSans-Regular.woff2 https://www.doi.gov/themes/custom/doi_uswds/assets/fonts/public-sans/PublicSans-Regular.woff2 — 32.1 KiB — 244 ms — font-display: swaphttps://www.doi.gov/themes/custom/doi_uswds/assets/fonts/public-sans/PublicSans-Bold.woff2PublicSans-Bold.woff2 https://www.doi.gov/themes/custom/doi_uswds/assets/fonts/public-sans/PublicSans-Bold.woff2 — 31.9 KiB — 157 ms — font-display: swap
PublicSans-Regular.woff2 woff2 swap
Size 32 KB
Load time 244 ms
Start 838 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 32 KB
Load time 157 ms
Start 838 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+
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
49 requests over 1806ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.8 s LCP 9.7 shttps://doi.gov// https://doi.gov/ — 301 — 124 B — 115 ms — h2https://www.doi.gov/www.doi.gov/ https://www.doi.gov/ — 200 — 10.6 KiB — 51 ms — h2https://www.googletagmanager.com/gtag/js?id=G-44JE7ECGDQwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-44JE7ECGDQ — 200 — 156.3 KiB — 176 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOIdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOI — 200 — 9.4 KiB — 72 ms — h3https://www.doi.gov/sites/default/files/css/css_33Jd3FRBNxMABvcAVcR0Kd4ZQN9_pd2pxMYfgfH0jB0.css?delta=0&language=en&theme=doi_uswds&include=eJxFyEEKwzAMBdELGetIQbGURtSxjL7V0NsXumg3w2PaU8WWx8ateYj5oJ_qET6WDinitiVuATGgC2Vy8CN4niCJnNzr_9QcM_duOFUK3lh60c7Q8jK9Qd_WyyW7fgBmCDHPwww.doi.gov/sites/default/files/css... https://www.doi.gov/sites/default/files/css/css_33Jd3FRBNxMABvcAVcR0Kd4ZQN9_pd2pxMYfgfH0jB0.css?delta=0&language=en&theme=doi_uswds&include=eJxFyEEKwzAMBdELGetIQbGURtSxjL7V0NsXumg3w2PaU8WWx8ateYj5oJ_qET6WDinitiVuATGgC2Vy8CN4niCJnNzr_9QcM_duOFUK3lh60c7Q8jK9Qd_WyyW7fgBmCDHP — 200 — 1.9 KiB — 127 ms — h2https://www.doi.gov/sites/default/files/css/css_axAsl9e42tdSRgsYhOkmZKl4e0rljYaLwz4LVc8w9_I.css?delta=1&language=en&theme=doi_uswds&include=eJxFyEEKwzAMBdELGetIQbGURtSxjL7V0NsXumg3w2PaU8WWx8ateYj5oJ_qET6WDinitiVuATGgC2Vy8CN4niCJnNzr_9QcM_duOFUK3lh60c7Q8jK9Qd_WyyW7fgBmCDHPwww.doi.gov/sites/default/files/css... https://www.doi.gov/sites/default/files/css/css_axAsl9e42tdSRgsYhOkmZKl4e0rljYaLwz4LVc8w9_I.css?delta=1&language=en&theme=doi_uswds&include=eJxFyEEKwzAMBdELGetIQbGURtSxjL7V0NsXumg3w2PaU8WWx8ateYj5oJ_qET6WDinitiVuATGgC2Vy8CN4niCJnNzr_9QcM_duOFUK3lh60c7Q8jK9Qd_WyyW7fgBmCDHP — 200 — 208.7 KiB — 464 ms — h2https://www.doi.gov/themes/custom/doi_uswds/assets/img/us_flag_small.pngwww.doi.gov/themes/custom/doi_uswds... https://www.doi.gov/themes/custom/doi_uswds/assets/img/us_flag_small.png — 200 — 811 B — 439 ms — h2https://www.doi.gov/themes/custom/doi_uswds/assets/img/icon-dot-gov.svgwww.doi.gov/themes/custom/doi_uswds... https://www.doi.gov/themes/custom/doi_uswds/assets/img/icon-dot-gov.svg — 200 — 713 B — 437 ms — h2https://www.doi.gov/themes/custom/doi_uswds/assets/img/icon-https.svgwww.doi.gov/themes/custom/doi_uswds... https://www.doi.gov/themes/custom/doi_uswds/assets/img/icon-https.svg — 200 — 677 B — 131 ms — h2https://www.doi.gov/themes/custom/doi_uswds/assets/img/usa-icons/instagram-white.svgwww.doi.gov/themes/custom/doi_uswds... https://www.doi.gov/themes/custom/doi_uswds/assets/img/usa-icons/instagram-white.svg — 200 — 1.0 KiB — 468 ms — h2https://www.doi.gov/themes/custom/doi_uswds/assets/img/usa-icons/facebook-white.svgwww.doi.gov/themes/custom/doi_uswds... https://www.doi.gov/themes/custom/doi_uswds/assets/img/usa-icons/facebook-white.svg — 200 — 712 B — 146 ms — h2https://www.doi.gov/sites/default/files/js/js_D-_GXQgxcRG49fq_EHLl4oBiGt0dT3WrISvzi2eWPNw.js?scope=footer&delta=0&language=en&theme=doi_uswds&include=eJx9ikEOgDAIwD6k7kkLGbgQJxhAjb_XeJg3b23TshByqGUoRQ1ZJXWaZlMJEhxQOYNAu4KLp8fGblNVrY2-8Ds7B_G6mR70fruf6AncKfwG_982-Awww.doi.gov/sites/default/files/js/... https://www.doi.gov/sites/default/files/js/js_D-_GXQgxcRG49fq_EHLl4oBiGt0dT3WrISvzi2eWPNw.js?scope=footer&delta=0&language=en&theme=doi_uswds&include=eJx9ikEOgDAIwD6k7kkLGbgQJxhAjb_XeJg3b23TshByqGUoRQ1ZJXWaZlMJEhxQOYNAu4KLp8fGblNVrY2-8Ds7B_G6mR70fruf6AncKfwG_982-A — 200 — 32.0 KiB — 439 ms — h2https://www.doi.gov/modules/contrib/ckeditor_accordion/js/accordion.frontend.min.js?tdujg4www.doi.gov/modules/contrib/ckedito... https://www.doi.gov/modules/contrib/ckeditor_accordion/js/accordion.frontend.min.js?tdujg4 — 200 — 1.8 KiB — 143 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 1968ms · 763KB · €21/mo
Unattributable
Other
Costly
Execution 689ms
Transfer 0 KB
Monthly Cost €7/mo
Google Tag Manager
Tag Manager
Costly
Execution 325ms
Transfer 156 KB
Unused 40%
Monthly Cost €4/mo
www.doi.gov
Other
Optional
Execution 190ms
Transfer 34 KB
Unused 61%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 187ms
Transfer 147 KB
Unused 43%
Monthly Cost €2/mo
www.doi.gov
Other
Optional
Execution 112ms
Transfer 209 KB
Monthly Cost €1/mo
dap.digitalgov.gov
Other
Optional
Execution 104ms
Transfer 9 KB
Monthly Cost €1/mo
www.doi.gov
Other
Optional
Execution 103ms
Transfer 11 KB
Monthly Cost €1/mo
www.doi.gov
Other
Optional
Execution 84ms
Transfer 32 KB
Monthly Cost €1/mo
dap.digitalgov.gov
Other
Optional
Execution 69ms
Transfer 4 KB
Monthly Cost €1/mo
siteimproveanalytics.com
Other
Optional
Execution 54ms
Transfer 12 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 147 KB
Unused 72%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 689ms and costs ~€7/month
  • Google Tag Manager adds 325ms 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

Unattributable takes 689ms 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 325ms 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

61% of www.doi.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

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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