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https://doi.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.

900 ms

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

1.19 s

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

7 ms

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

0.031

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

1.35 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.

1.62 s

Page Load Progression

389 ms
777 ms
1.2 s
1.6 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
18.0 MB transferred, 54 requests
FIX
18.0 MB transferred, 54 requests
Critical::
Page weighs 20.5 MB (18.0 MB transferred)
Warning::
JavaScript is 558 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 558 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::
54 HTTP requests
Info::
Estimated 3.8 g CO2 per page load
18.0 MB / 2.4 MB budget
18.0 MB transferred
54 requests
3.8 g CO2 per page load
Other 16.7 MiB 92%
JavaScript 557.7 KiB 3%
Images 544.0 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 547 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
54 resources · 18.0 MB · 256 KB savings available
FIX
54 resources · 18.0 MB · 256 KB savings available
Warning::
Page weight 17.0 MB over 1MB target
Got: 18.0 MB Expected: ≤ 1 MB
Info::
~256 KB of savings available
Warning::
53 third-party resources (100% of weight)
Info::
2 resources over 200KB
54 resources · 18.0 MiB · 53 third-party 17.0 MiB over 1MB target
Media 92% · 16.7 MiB
JavaScript 3% · 557.7 KiB
Image 3% · 546.8 KiB
CSS 1% · 210.6 KiB
Font 0% · 64.0 KiB
Document 0% · 10.6 KiB
Other 0% · 1.5 KiB

~256.2 KiB of savings available

Remove unused JavaScript: 256.2 KiB
C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 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.
26 images 544 KB
0 oversized -0 KB
24 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 Bundles
Action
12 scripts, 256 KB unused
REVIEW
12 scripts, 256 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-44JE...: 110 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-44JE...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 59 KB unused (40%)
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: 256 KB
256 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-44JE7ECGDQ&cx=c&gtm=4e64k0156 KB110 KB (70%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-44JE7ECGDQ156 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB59 KB (40%)✓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+
JS Execution Cost
418ms total JS execution
PASS
418ms total JS execution
Info::
Unattributable: 166ms CPU time
Info::
https://www.doi.gov/: 104ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 90ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-44JE...: 57ms CPU time
Warning::
Third-party scripts: 418ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 34% Style & Layout 13% Script Parsing & Compilation 7% Parse HTML & CSS 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
Unattributable166ms2ms0ms3rd
https://www.doi.gov/104ms3ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L90ms81ms9ms3rd
https://www.googletagmanager.com/gtag/js?id=G-44JE7ECGDQ57ms47ms10ms3rd
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 500 ms 1.0 s FCP 900 ms LCP 1.2 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 — 21 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 — 23 ms — font-display: swap
PublicSans-Regular.woff2 woff2 swap
Size 32 KB
Load time 21 ms
Start 322 ms
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 32 KB
Load time 23 ms
Start 323 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
Network Waterfall
54 requests over 807ms
INFO
0 ms 500 ms 1.0 s FCP 900 ms LCP 1.2 shttps://doi.gov// https://doi.gov/ — 301 — 124 B — 84 ms — h2https://www.doi.gov/www.doi.gov/ https://www.doi.gov/ — 200 — 10.6 KiB — 77 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 — 156.0 KiB — 213 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 — 14 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 — 13 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 — 41 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 — 13 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 — 37 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 — 26 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 — 29 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 — 30 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 — 28 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 — 31 ms — h2https://cdn.jsdelivr.net/npm/js-cookie@3.0.5/dist/js.cookie.min.jscdn.jsdelivr.net/npm/js-cookie@3.0.... https://cdn.jsdelivr.net/npm/js-cookie@3.0.5/dist/js.cookie.min.js — 200 — 1.3 KiB — 14 ms — h2https://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-Awww.doi.gov/sites/default/files/js/... 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-A — 200 — 1.9 KiB — 30 ms — h2https://www.doi.gov/modules/custom/doi_analytics/assets/js/doi-siteimprove.js?v=1.xwww.doi.gov/modules/custom/doi_anal... https://www.doi.gov/modules/custom/doi_analytics/assets/js/doi-siteimprove.js?v=1.x — 200 — 524 B — 30 ms — h2https://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-Awww.doi.gov/sites/default/files/js/... 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-A — 200 — 34.4 KiB — 37 ms — h2https://www.doi.gov/themes/custom/doi_uswds/assets/img/usa-icons/flickr-white.svgwww.doi.gov/themes/custom/doi_uswds... https://www.doi.gov/themes/custom/doi_uswds/assets/img/usa-icons/flickr-white.svg — 200 — 527 B — 33 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 418ms · 314KB · €5/mo
Unattributable
Other
Optional
Execution 166ms
Transfer 0 KB
Monthly Cost €2/mo
www.doi.gov
Other
Optional
Execution 104ms
Transfer 11 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 90ms
Transfer 147 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 57ms
Transfer 156 KB
Unused 42%
Monthly Cost €1/mo

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

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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