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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
58
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

2.56 s

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

6.13 s

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

58 ms

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

0.002

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

4.29 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.

6.25 s

Page Load Progression

545 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.3 s
3.8 s
4.4 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
2.7 MB transferred, 162 requests
FIX
2.7 MB transferred, 162 requests
Warning::
Page weighs 7.1 MB (2.7 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
Fonts are 404 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 404 KB
Warning::
162 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.57 g CO2 per page load
2.7 MB / 2.4 MB budget
2.7 MB transferred
162 requests
0.57 g CO2 per page load
JavaScript 1.4 MiB 50%
Images 785.1 KiB 28%
Fonts 403.6 KiB 15%
CSS 168.8 KiB 6%
HTML 16.6 KiB 1%
Other 11.4 KiB 0%
Other 630 B 0%
Other 595 B 0%
Other 232 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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (2.7 MiB of 2.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
87 scripts, 431 KB unused
FIX
87 scripts, 431 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-CSLL...: 61 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FH5X...: 61 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KWR...: 59 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.usgs.gov/modules/custom/usgs_products/...: 57 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.usgs.gov/modules/custom/usgs_products/...: unminified — 78 KB could be saved
Info::
Total unused JavaScript: 431 KB
431 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-CSLL4ZEK4L147 KB61 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-FH5X1PMV8C&cx=c&gtm=4e64h1157 KB61 KB (39%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KWRSKS136 KB59 KB (50%)✓3rd
https://www.usgs.gov/modules/custom/usgs_products/js/jquery.dataTables.js?v=1.0.0113 KB57 KB (51%)✗3rd
https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js251 KB49 KB (49%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://www.usgs.gov/core/misc/message.js?v=10.5.63 KB—✓3rd
https://www.usgs.gov/core/misc/dialog/dialog-deprecation.js?v=10.5.61 KB—✓3rd
https://www.usgs.gov/core/misc/drupal.init.js?v=10.5.61 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

F
Page Weight Inventory
Action
162 resources · 2.7 MB · 431 KB savings available
FIX
162 resources · 2.7 MB · 431 KB savings available
Warning::
Page weight 1.7 MB over 1MB target
Got: 2.7 MB Expected: ≤ 1 MB
Info::
~431 KB of savings available
Warning::
161 third-party resources (100% of weight)
Info::
1 resources over 200KB
162 resources · 2.7 MiB · 161 third-party 1.7 MiB over 1MB target
JavaScript 50% · 1.4 MiB
Image 29% · 796.2 KiB
Font 15% · 403.6 KiB
CSS 6% · 168.8 KiB
Document 1% · 17.0 KiB
Other 0% · 1.4 KiB

~430.7 KiB of savings available

Remove unused JavaScript: 430.7 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
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://www.usgs.gov/themes/custom/usgs_tantalum/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usgs.gov/themes/custom/usgs_tantalum/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://touchpoints.app.cloud.gov/img/us_flag_smal... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usgs.gov/themes/custom/usgs_tantalum/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usgs.gov/themes/custom/usgs_tantalum/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usgs.gov/themes/custom/usgs_tantalum/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usgs.gov/themes/custom/usgs_tantalum/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.usgs.gov/themes/custom/usgs_tantalum/a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 785 KB
0 oversized -0 KB
20 legacy format
8 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

B
JS Execution Cost
650ms total JS execution
REVIEW
650ms total JS execution
Info::
https://www.usgs.gov/: 171ms CPU time
Info::
Unattributable: 160ms CPU time
Info::
https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml...: 107ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 72ms CPU time
Info::
https://www.usgs.gov/core/misc/drupal.init.js?v=10...: 70ms CPU time
Warning::
Third-party scripts: 650ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Other 21% Style & Layout 17% Script Parsing & Compilation 12% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.usgs.gov/171ms2ms0ms3rd
Unattributable160ms2ms0ms3rd
https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js107ms80ms25ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L72ms62ms10ms3rd
https://www.usgs.gov/core/misc/drupal.init.js?v=10.5.670ms37ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-FH5X1PMV8C&cx=c&gtm=4e64h170ms60ms10ms3rd
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
10 fonts (404 KB)
PASS
10 fonts (404 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

404 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.6 s LCP 6.1 shttps://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/merriweather/Latin-Merriweather-Regular.woff2Latin-Merriweather-Regu... https://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/merriweather/Latin-Merriweather-Regular.woff2 — 21.5 KiB — 28 ms — font-display: swaphttps://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-Regular.woff2PublicSans-Regular.woff2 https://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-Regular.woff2 — 32.1 KiB — 42 ms — font-display: swaphttps://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-Italic.woff2PublicSans-Italic.woff2 https://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-Italic.woff2 — 32.6 KiB — 445 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 — 95 ms — font-display: swaphttps://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-SemiBold.woff2PublicSans-SemiBold.woff2 https://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-SemiBold.woff2 — 32.2 KiB — 39 ms — font-display: swaphttps://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/merriweather/Latin-Merriweather-Light.woff2Latin-Merriweather-Ligh... https://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/merriweather/Latin-Merriweather-Light.woff2 — 21.1 KiB — 35 ms — font-display: swaphttps://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-Bold.woff2PublicSans-Bold.woff2 https://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-Bold.woff2 — 32.0 KiB — 57 ms — font-display: swaphttps://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/merriweather/Latin-Merriweather-Bold.woff2Latin-Merriweather-Bold... https://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/merriweather/Latin-Merriweather-Bold.woff2 — 21.2 KiB — 35 ms — font-display: swaphttps://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-Light.woff2PublicSans-Light.woff2 https://www.usgs.gov/themes/custom/usgs_tantalum/assets/fonts/public-sans/PublicSans-Light.woff2 — 32.2 KiB — 36 ms — font-display: swaphttps://use.fontawesome.com/releases/v6.5.1/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://use.fontawesome.com/releases/v6.5.1/webfonts/fa-regular-400.woff2 — 25.4 KiB — 59 ms — font-display: swap
Latin-Merriweather-Regu... woff2 swap
Size 22 KB
Load time 28 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Regular.woff2 woff2 swap
Size 32 KB
Load time 42 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Italic.woff2 woff2 swap
Size 33 KB
Load time 445 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 95 ms
Start 3.1 s
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
PublicSans-SemiBold.woff2 woff2 swap
Size 32 KB
Load time 39 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Ligh... woff2 swap
Size 21 KB
Load time 35 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Bold.woff2 woff2 swap
Size 32 KB
Load time 57 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Bold... woff2 swap
Size 21 KB
Load time 35 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
PublicSans-Light.woff2 woff2 swap
Size 32 KB
Load time 36 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 59 ms
Start 3.1 s
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)

Fixing the unchecked items could save ~77 KB and ~154 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
162 requests over 5542ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.6 s LCP 6.1 shttps://usgs.gov// https://usgs.gov/ — 301 — 339 B — 1.1 s — http/1.1https://www.usgs.gov/www.usgs.gov/ https://www.usgs.gov/ — 200 — 16.6 KiB — 1.6 s — h3https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/core.css?tduby0www.usgs.gov/core/assets/vendor/jqu... https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/core.css?tduby0 — 200 — 1.0 KiB — 79 ms — h3https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/controlgroup.css?tduby0www.usgs.gov/core/assets/vendor/jqu... https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/controlgroup.css?tduby0 — 200 — 889 B — 80 ms — h3https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/checkboxradio.css?tduby0www.usgs.gov/core/assets/vendor/jqu... https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/checkboxradio.css?tduby0 — 200 — 726 B — 79 ms — h3https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/resizable.css?tduby0www.usgs.gov/core/assets/vendor/jqu... https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/resizable.css?tduby0 — 200 — 773 B — 82 ms — h3https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/button.css?tduby0www.usgs.gov/core/assets/vendor/jqu... https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/button.css?tduby0 — 200 — 997 B — 84 ms — h3https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/dialog.css?tduby0www.usgs.gov/core/assets/vendor/jqu... https://www.usgs.gov/core/assets/vendor/jquery.ui/themes/base/dialog.css?tduby0 — 200 — 963 B — 89 ms — h3https://www.usgs.gov/core/misc/components/progress.module.css?tduby0www.usgs.gov/core/misc/components/p... https://www.usgs.gov/core/misc/components/progress.module.css?tduby0 — 200 — 713 B — 83 ms — h3https://www.usgs.gov/core/misc/components/ajax-progress.module.css?tduby0www.usgs.gov/core/misc/components/a... https://www.usgs.gov/core/misc/components/ajax-progress.module.css?tduby0 — 200 — 843 B — 84 ms — h3https://www.usgs.gov/core/modules/system/css/components/align.module.css?tduby0www.usgs.gov/core/modules/system/cs... https://www.usgs.gov/core/modules/system/css/components/align.module.css?tduby0 — 200 — 578 B — 90 ms — h3https://www.usgs.gov/core/modules/system/css/components/fieldgroup.module.css?tduby0www.usgs.gov/core/modules/system/cs... https://www.usgs.gov/core/modules/system/css/components/fieldgroup.module.css?tduby0 — 200 — 457 B — 91 ms — h3https://www.usgs.gov/core/modules/system/css/components/container-inline.module.css?tduby0www.usgs.gov/core/modules/system/cs... https://www.usgs.gov/core/modules/system/css/components/container-inline.module.css?tduby0 — 200 — 532 B — 92 ms — h3https://www.usgs.gov/core/modules/system/css/components/clearfix.module.css?tduby0www.usgs.gov/core/modules/system/cs... https://www.usgs.gov/core/modules/system/css/components/clearfix.module.css?tduby0 — 200 — 584 B — 93 ms — h3https://www.usgs.gov/core/modules/system/css/components/details.module.css?tduby0www.usgs.gov/core/modules/system/cs... https://www.usgs.gov/core/modules/system/css/components/details.module.css?tduby0 — 200 — 484 B — 94 ms — h3https://www.usgs.gov/core/modules/system/css/components/hidden.module.css?tduby0www.usgs.gov/core/modules/system/cs... https://www.usgs.gov/core/modules/system/css/components/hidden.module.css?tduby0 — 200 — 1018 B — 100 ms — h3https://www.usgs.gov/core/modules/system/css/components/item-list.module.css?tduby0www.usgs.gov/core/modules/system/cs... https://www.usgs.gov/core/modules/system/css/components/item-list.module.css?tduby0 — 200 — 521 B — 97 ms — h3https://www.usgs.gov/core/modules/system/css/components/js.module.css?tduby0www.usgs.gov/core/modules/system/cs... https://www.usgs.gov/core/modules/system/css/components/js.module.css?tduby0 — 200 — 707 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200 — 6.3 KiB — 57 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOI&subagency=USGS&pua=UA-77708142-1&pua=UA-108444827-1&pga4=G-FH5X1PMV8C&sp=lookup,locate,keywords&exts=png,gif,jpg&dclink=true&autotracker=true&yt=true&optout=false&palinteractiontypedim=1dap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=DOI&subagency=USGS&pua=UA-77708142-1&pua=UA-108444827-1&pga4=G-FH5X1PMV8C&sp=lookup,locate,keywords&exts=png,gif,jpg&dclink=true&autotracker=true&yt=true&optout=false&palinteractiontypedim=1 — 200 — 9.4 KiB — 43 ms — h3https://touchpoints.app.cloud.gov/touchpoints/5e10f821.jstouchpoints.app.cloud.gov/touchpoin... https://touchpoints.app.cloud.gov/touchpoints/5e10f821.js — 200 — 80.0 KiB — 1.1 s — h2https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.jsdap.digitalgov.gov/web-vitals/dist/... https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js — 200 — 4.5 KiB — 21 ms — h3https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4Lwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L — 200 — 147.2 KiB — 50 ms — h2https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1 — 200 — 147.2 KiB — 63 ms — h2https://www.googletagmanager.com/gtag/js?id=G-FH5X1PMV8C&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-FH5X1PMV8C&cx=c&gtm=4e64h1 — 200 — 157.1 KiB — 73 ms — h2https://www.youtube.com/iframe_apiwww.youtube.com/iframe_api https://www.youtube.com/iframe_api — 200 — 3.6 KiB — 112 ms — h2https://script.hotjar.com/modules.6a0f3932cb1341a35c18.jsscript.hotjar.com/modules.6a0f3932c... https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js — 200 — 56.6 KiB — 79 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 650ms · 573KB · $9/mo
www.usgs.gov
Other
Optional
Execution 171ms
Transfer 17 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 160ms
Transfer 0 KB
Monthly Cost $2/mo
jsDelivr
CDN
Optional
Execution 107ms
Transfer 251 KB
Unused 49%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 147 KB
Unused 41%
Monthly Cost $1/mo
www.usgs.gov
Other
Optional
Execution 70ms
Transfer 1 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 70ms
Transfer 157 KB
Unused 39%
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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