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https://health.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
86
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.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

1.04 s

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

2.16 s

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

5 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.

1.42 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.

2.34 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
8 PASS 2 REVIEW 3 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 62 requests
FIX
2.8 MB transferred, 62 requests
Warning::
Page weighs 5.7 MB (2.8 MB transferred)
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 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::
62 HTTP requests
Info::
Estimated 0.60 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
62 requests
0.60 g CO2 per page load
Images 1.5 MiB 53%
JavaScript 1.2 MiB 41%
CSS 80.5 KiB 3%
HTML 77.1 KiB 3%
Other 25.9 KiB 1%
Fonts 2.9 KiB 0%
Other 593 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

D
JS Bundles
Action
15 scripts, 348 KB unused
FIX
15 scripts, 348 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-CJZG...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TCN...: 61 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://health.gov/sites/oash/files/js/js_FKpjS5Ud...: 28 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 348 KB
348 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-CJZGNYWJ97&cx=c&gtm=4e64h1151 KB64 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TCNK2RJR129 KB61 KB (47%)✓3rd
https://health.gov/sites/oash/files/js/js_FKpjS5UdJTK6k-uNx3bagFOa7DqeKndZnPxJb8ZMoqA.js?scope=footer&delta=0&language=en&theme=oash_uswds&include=eJx9kMFuAyEMRH9oC5-EDBjHjcERJt1uv75oQ6U0h1xG8zxzGUOu3EJmECXz8EzOUDAN7VsU-Dn8qcsnATNhG4tFIS97UzkKi_xh18qGizqU5XaMt61oG7CjaUX_5J190bvM2YXrRqokGAaQpymv7OATvv8f66Zgl3C3PZsn0QjyYeMQbrTNNenqT3XnmrMVosSQtBWme4fB2jyouY5VB65KumLm-abAbSCt1iOClLTnya70OQFb_gV2tpA456 KB28 KB (50%)✓1st
https://health.gov/sites/oash/files/js/js_0dXBHfkYuvwfCpAwLWT9F135nfUb9CcmAUMHC8lg-yc.js?scope=footer&delta=2&language=en&theme=oash_uswds&include=eJx9kMFuAyEMRH9oC5-EDBjHjcERJt1uv75oQ6U0h1xG8zxzGUOu3EJmECXz8EzOUDAN7VsU-Dn8qcsnATNhG4tFIS97UzkKi_xh18qGizqU5XaMt61oG7CjaUX_5J190bvM2YXrRqokGAaQpymv7OATvv8f66Zgl3C3PZsn0QjyYeMQbrTNNenqT3XnmrMVosSQtBWme4fB2jyouY5VB65KumLm-abAbSCt1iOClLTnya70OQFb_gV2tpA439 KB26 KB (69%)✓1st
https://health.gov/modules/contrib/uswds_ckeditor_integration/js/aftermarket/uswds_accordion.js?tdv1nu1 KB—✓1st
https://use.fontawesome.com/releases/v6.4.0/js/all.js492 KB—✓3rd
https://use.fontawesome.com/releases/v6.4.0/js/v4-shims.js9 KB—✓3rd
https://unpkg.com/aos@2.3.4/dist/aos.js5 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

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

D
Page Weight Inventory
Action
62 resources · 2.8 MB · 348 KB savings available
FIX
62 resources · 2.8 MB · 348 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~348 KB of savings available
Info::
12 third-party resources (38% of weight)
Info::
4 resources over 200KB
62 resources · 2.8 MiB · 12 third-party 1.8 MiB over 1MB target
Image 54% · 1.5 MiB
JavaScript 41% · 1.2 MiB
CSS 3% · 80.5 KiB
Document 3% · 77.1 KiB
Font 0% · 2.9 KiB
Other 0% · 593 B

~347.7 KiB of savings available

Remove unused JavaScript: 347.7 KiB
C
Image Optimization
Action
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://health.gov/themes/custom/oash_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://health.gov/themes/custom/oash_uswds/assets... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 1.5 MB
0 oversized -0 KB
30 legacy format
12 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Third-Party Impact
38% third-party, 0 ms blocking
PASS
38% third-party, 0 ms blocking
Info::
Third-party code accounts for 38% of page weight (1.1 MiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
62%
38%
First-party Third-party
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
429ms total JS execution
PASS
429ms total JS execution
Info::
https://health.gov/: 143ms CPU time
Info::
Unattributable: 116ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CJZG...: 61ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 55ms CPU time
Info::
https://health.gov/sites/oash/files/js/js_FKpjS5Ud...: 53ms CPU time
Warning::
Third-party scripts: 233ms (54% of total)

Main Thread Breakdown

Script Evaluation 37% Other 22% Style & Layout 20% Script Parsing & Compilation 12% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://health.gov/143ms2ms0ms1st
Unattributable116ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CJZGNYWJ97&cx=c&gtm=4e64h161ms48ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L55ms46ms10ms3rd
https://health.gov/sites/oash/files/js/js_FKpjS5UdJTK6k-uNx3bagFOa7DqeKndZnPxJb8ZMoqA.js?scope=footer&delta=0&language=en&theme=oash_uswds&include=eJx9kMFuAyEMRH9oC5-EDBjHjcERJt1uv75oQ6U0h1xG8zxzGUOu3EJmECXz8EzOUDAN7VsU-Dn8qcsnATNhG4tFIS97UzkKi_xh18qGizqU5XaMt61oG7CjaUX_5J190bvM2YXrRqokGAaQpymv7OATvv8f66Zgl3C3PZsn0QjyYeMQbrTNNenqT3XnmrMVosSQtBWme4fB2jyouY5VB65KumLm-abAbSCt1iOClLTnya70OQFb_gV2tpA453ms37ms3ms1st
A+
Font Loading
3 fonts (3 KB)
PASS
3 fonts (3 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

3 KB total

Render-blocking

0

of 3

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 FCP 1.0 s LCP 2.2 shttps://health.gov/themes/custom/oash_uswds/assets/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://health.gov/themes/custom/oash_uswds/assets/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 589 B — 429 ms — font-display: swaphttps://health.gov/themes/custom/oash_uswds/assets/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://health.gov/themes/custom/oash_uswds/assets/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 589 B — 429 ms — font-display: swaphttps://health.gov/libraries/slick/slick/fonts/slick.woffslick.woff https://health.gov/libraries/slick/slick/fonts/slick.woff — 1.8 KiB — 332 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 1 KB
Load time 429 ms
Start 761 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 1 KB
Load time 429 ms
Start 761 ms
Risk FOUT — text flashes from fallback to web font
slick.woff woff swap
Size 2 KB
Load time 332 ms
Start 762 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 ~1 KB and ~2 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+
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600, public
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=3600, public

DirectiveValueMeaning
max-age3600Cache for 1 hour
public—Any cache may store this response
Effective TTL: 3600 seconds
Network Waterfall
62 requests over 1438ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 2.2 shttps://health.gov// https://health.gov/ — 200 — 77.1 KiB — 580 ms — h2https://health.gov/sites/oash/files/css/css_I4V1eceRiNe0DaqLAEqlYBgg-ILFHYa2tlgNysfcdKE.css?delta=0&language=en&theme=oash_uswds&include=eJx9kd2SwyAIhV_I6CNliNKELYoj2m769GuS_mxvcsPA8TsiODE8VscCgdJsvBR0XmKWhKmqFdBlbHoPOgwLFjkFflrMEVOjivEUZJFr73aRcmChtAxs4Qd-DyFJicD0QMOwSqtjIPVyw7K6fp0XNhEDgbsQVyzWQ64kyXx6uJllAh60rrzNlaHAXCAv-mr2UWxLuU1MumAwyuSvbo_Wq37VEShZz6BK_uugLhjR6Kp9cDeBomk0Zqj9bUldgpvttW57OV43dsl8S2_bfy1J6NrumHgavaQLza3ANqwDUVswSn0h74nGz9pHYCxV3bH4ozjDPZTwovf8FBZuMb3wuVAYju86M0UJwE_Lnp_BfaF5pBTIQ5XydG3i8BaH_nHV3Ajv6vZo-62N8Q9vWiBt/sites/oash/files/css/css_I4V1eceRi... https://health.gov/sites/oash/files/css/css_I4V1eceRiNe0DaqLAEqlYBgg-ILFHYa2tlgNysfcdKE.css?delta=0&language=en&theme=oash_uswds&include=eJx9kd2SwyAIhV_I6CNliNKELYoj2m769GuS_mxvcsPA8TsiODE8VscCgdJsvBR0XmKWhKmqFdBlbHoPOgwLFjkFflrMEVOjivEUZJFr73aRcmChtAxs4Qd-DyFJicD0QMOwSqtjIPVyw7K6fp0XNhEDgbsQVyzWQ64kyXx6uJllAh60rrzNlaHAXCAv-mr2UWxLuU1MumAwyuSvbo_Wq37VEShZz6BK_uugLhjR6Kp9cDeBomk0Zqj9bUldgpvttW57OV43dsl8S2_bfy1J6NrumHgavaQLza3ANqwDUVswSn0h74nGz9pHYCxV3bH4ozjDPZTwovf8FBZuMb3wuVAYju86M0UJwE_Lnp_BfaF5pBTIQ5XydG3i8BaH_nHV3Ajv6vZo-62N8Q9vWiBt — 200 — 3.5 KiB — 111 ms — h2https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_alerts/css/uswds-paragraph-components-alerts.css?tdv1nu/modules/contrib/uswds_paragraph_co... https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_alerts/css/uswds-paragraph-components-alerts.css?tdv1nu — 200 — 469 B — 113 ms — h2https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_cards/css/uswds-paragraph-components-cards.css?tdv1nu/modules/contrib/uswds_paragraph_co... https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_cards/css/uswds-paragraph-components-cards.css?tdv1nu — 200 — 780 B — 112 ms — h2https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_columns/css/uswds-paragraph-components-grid-layout.css?tdv1nu/modules/contrib/uswds_paragraph_co... https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_columns/css/uswds-paragraph-components-grid-layout.css?tdv1nu — 200 — 524 B — 114 ms — h2https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_modal/css/uswds-paragraph-components-modal.css?tdv1nu/modules/contrib/uswds_paragraph_co... https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_modal/css/uswds-paragraph-components-modal.css?tdv1nu — 200 — 497 B — 114 ms — h2https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_step_indicator/css/uswds-paragraph-components-step-indicator-list.css?tdv1nu/modules/contrib/uswds_paragraph_co... https://health.gov/modules/contrib/uswds_paragraph_components/modules/uswds_paragraph_components_step_indicator/css/uswds-paragraph-components-step-indicator-list.css?tdv1nu — 200 — 543 B — 115 ms — h2https://health.gov/sites/oash/files/css/css_0z01HNpQ8KW4R2o_WEnNKP0VWpDdomlBpbZoIJJaHIY.css?delta=6&language=en&theme=oash_uswds&include=eJx9kd2SwyAIhV_I6CNliNKELYoj2m769GuS_mxvcsPA8TsiODE8VscCgdJsvBR0XmKWhKmqFdBlbHoPOgwLFjkFflrMEVOjivEUZJFr73aRcmChtAxs4Qd-DyFJicD0QMOwSqtjIPVyw7K6fp0XNhEDgbsQVyzWQ64kyXx6uJllAh60rrzNlaHAXCAv-mr2UWxLuU1MumAwyuSvbo_Wq37VEShZz6BK_uugLhjR6Kp9cDeBomk0Zqj9bUldgpvttW57OV43dsl8S2_bfy1J6NrumHgavaQLza3ANqwDUVswSn0h74nGz9pHYCxV3bH4ozjDPZTwovf8FBZuMb3wuVAYju86M0UJwE_Lnp_BfaF5pBTIQ5XydG3i8BaH_nHV3Ajv6vZo-62N8Q9vWiBt/sites/oash/files/css/css_0z01HNpQ8... https://health.gov/sites/oash/files/css/css_0z01HNpQ8KW4R2o_WEnNKP0VWpDdomlBpbZoIJJaHIY.css?delta=6&language=en&theme=oash_uswds&include=eJx9kd2SwyAIhV_I6CNliNKELYoj2m769GuS_mxvcsPA8TsiODE8VscCgdJsvBR0XmKWhKmqFdBlbHoPOgwLFjkFflrMEVOjivEUZJFr73aRcmChtAxs4Qd-DyFJicD0QMOwSqtjIPVyw7K6fp0XNhEDgbsQVyzWQ64kyXx6uJllAh60rrzNlaHAXCAv-mr2UWxLuU1MumAwyuSvbo_Wq37VEShZz6BK_uugLhjR6Kp9cDeBomk0Zqj9bUldgpvttW57OV43dsl8S2_bfy1J6NrumHgavaQLza3ANqwDUVswSn0h74nGz9pHYCxV3bH4ozjDPZTwovf8FBZuMb3wuVAYju86M0UJwE_Lnp_BfaF5pBTIQ5XydG3i8BaH_nHV3Ajv6vZo-62N8Q9vWiBt — 200 — 2.6 KiB — 116 ms — h2https://unpkg.com/aos@2.3.4/dist/aos.cssunpkg.com/aos@2.3.4/dist/aos.css https://unpkg.com/aos@2.3.4/dist/aos.css — 200 — 2.6 KiB — 56 ms — 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb9194017246zd9194017246&_p=1776810810360&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&are=1&cid=1043789338.1776810811&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266401~117512543~117884344~118128922&dl=https%3A%2F%2Fhealth.gov%2F&dt=Office%20of%20the%20Assistant%20Secretary%20for%20Health%20%7C%20Health.gov&dr=&sid=1776810810&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=HHS&ep.subagency=HEALTH.GOV&ep.site_topic=unspecified%3Ahealth.gov&ep.site_platform=unspecified%3Ahealth.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=health.gov&tfd=1257region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb9194017246zd9194017246&_p=1776810810360&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&are=1&cid=1043789338.1776810811&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266401~117512543~117884344~118128922&dl=https%3A%2F%2Fhealth.gov%2F&dt=Office%20of%20the%20Assistant%20Secretary%20for%20Health%20%7C%20Health.gov&dr=&sid=1776810810&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=HHS&ep.subagency=HEALTH.GOV&ep.site_topic=unspecified%3Ahealth.gov&ep.site_platform=unspecified%3Ahealth.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=health.gov&tfd=1257 — 204 — 48 B — 35 ms — h2https://health.gov/themes/custom/oash_uswds/images/favicon.ico/themes/custom/oash_uswds/images/fa... https://health.gov/themes/custom/oash_uswds/images/favicon.ico — 200 — 4.7 KiB — 145 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
54% of JavaScript execution is third-party
First-party Third-party 233ms · 298KB · $3/mo
Unattributable
Other
Optional
Execution 116ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 151 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 55ms
Transfer 147 KB
Unused 42%
Monthly Cost $1/mo

54% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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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