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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
52
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

8.02 s

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

16.95 s

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

248 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.

8.02 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.

18.89 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
5.8 MB transferred, 77 requests
FIX
5.8 MB transferred, 77 requests
Critical::
Page weighs 12.4 MB (5.8 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 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
CSS is 935 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 935 KB
Info::
Fonts are 337 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 337 KB
Info::
77 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.8 MB / 2.4 MB budget
5.8 MB transferred
77 requests
1.2 g CO2 per page load
Images 3.4 MiB 58%
JavaScript 1.0 MiB 18%
CSS 934.5 KiB 16%
Fonts 337.5 KiB 6%
Other 118.0 KiB 2%
HTML 13.4 KiB 0%
Other 2.5 KiB 0%
Other 903 B 0%
Other 547 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

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

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 (5.8 MiB of 5.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2118ms total JS execution
FIX
2118ms total JS execution
Warning::
Unattributable: 628ms CPU time
Warning::
https://www.nps.gov/index.htm: 525ms CPU time
Warning::
https://www.nps.gov/common/commonspot/templates/as...: 442ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 200ms CPU time
Info::
https://www.nps.gov/ADF/thirdParty/jquery/jquery-3...: 168ms CPU time
Warning::
Third-party scripts: 2118ms (100% of total)

Main Thread Breakdown

Other 28% Script Evaluation 28% Script Parsing & Compilation 19% Style & Layout 17% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
Unattributable628ms7ms0ms3rd
https://www.nps.gov/index.htm525ms8ms3ms3rd
https://www.nps.gov/common/commonspot/templates/assets/js/app.late.min.js?v=20230112442ms130ms305ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L200ms171ms28ms3rd
https://www.nps.gov/ADF/thirdParty/jquery/jquery-3.6.js168ms140ms12ms3rd
https://www.nps.gov/common/commonspot/templates/assets/js/app.early.min.js?v=20230112155ms99ms31ms3rd
D
JS Bundles
Action
23 scripts, 265 KB unused
FIX
23 scripts, 265 KB unused
Warning::
https://www.nps.gov/common/commonspot/templates/as...: 205 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nps.gov/common/commonspot/templates/as...: unminified — 249 KB could be saved
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nps.gov/common/commonspot/templates/js...: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 265 KB
265 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nps.gov/common/commonspot/templates/assets/js/app.late.min.js?v=20230112680 KB205 KB (60%)✗3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L148 KB60 KB (41%)✓3rd
https://www.nps.gov/common/commonspot/templates/js/intercept-include.js?v=202301125 KB—✗3rd
https://www.nps.gov/common/commonspot/templates/js/uswds/uswds.js1 KB—✓3rd
https://www.nps.gov/common/commonspot/templates/js/uswds/uswds-init.js1 KB—✓3rd
https://www.nps.gov/common/commonspot/templates/js/federated-analytics-uav1.js?ver=true&agency=DOI&subagency=NPS&exts=rtf,odt,ods,odp,brf&dclink=true&enhlink=true9 KB—✓3rd
https://www.nps.gov/common/commonspot/templates/js/global.js?v=2023011222 KB—✗3rd
https://www.nps.gov/common/commonspot/templates/assets/libs/jquery.magnific-popup/jquery.magnific-popup.js14 KB—✗3rd
https://www.nps.gov/common/commonspot/templates/assets/js/redesign.js?v=202301122 KB—✓3rd
https://www.nps.gov/common/commonspot/templates/js/libs/jquery.colorbox-min.js9 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

D
Page Weight Inventory
Action
77 resources · 5.8 MB · 265 KB savings available
FIX
77 resources · 5.8 MB · 265 KB savings available
Warning::
Page weight 4.8 MB over 1MB target
Got: 5.8 MB Expected: ≤ 1 MB
Info::
~265 KB of savings available
Warning::
76 third-party resources (100% of weight)
Info::
6 resources over 200KB
77 resources · 5.8 MiB · 76 third-party 4.8 MiB over 1MB target
Image 60% · 3.5 MiB
JavaScript 18% · 1.0 MiB
CSS 16% · 934.5 KiB
Font 6% · 337.5 KiB
Document 0% · 13.7 KiB
Other 0% · 4.2 KiB

~264.8 KiB of savings available

Remove unused JavaScript: 264.8 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
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://www.nps.gov/common/uploads/grid_builder/cr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/commonspot/templates/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/uploads/grid_builder/cr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/commonspot/templates/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/uploads/grid_builder/cr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/commonspot/templates/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/uploads/grid_builder/cr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/uploads/grid_builder/cr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/uploads/grid_builder/cr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nps.gov/common/commonspot/templates/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 3.4 MB
0 oversized -0 KB
31 legacy format
10 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

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
1 fonts (337 KB)
PASS
1 fonts (337 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

337 KB total

Render-blocking

0

of 1

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 FCP 8.0 s LCP 17.0 sdata:font/woff2;base64,d09GMgABAAAABUX0ABMAAAANNCAABUV6AAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGsAQG4jcEhyB…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAABUX0ABMAAAANNCAABUV6AAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGsAQG4jcEhyB… — 337.5 KiB — 122 ms — font-display: swap
woff2;base64,d09GMgABAA... woff2 swap
Size 337 KB
Load time 122 ms
Start 807 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
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 ~169 KB and ~338 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
77 requests over 1288ms
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 FCP 8.0 s LCP 17.0 shttps://nps.gov// https://nps.gov/ — 301 — 343 B — 623 ms — http/1.1https://www.nps.gov/www.nps.gov/ https://www.nps.gov/ — 302 — 287 B — 13 ms — h2https://www.nps.gov/index.htmwww.nps.gov/index.htm https://www.nps.gov/index.htm — 200 — 13.4 KiB — 4 ms — h2https://www.nps.gov/ADF/thirdParty/jquery/jquery-3.6.jswww.nps.gov/ADF/thirdParty/jquery/j... https://www.nps.gov/ADF/thirdParty/jquery/jquery-3.6.js — 200 — 30.7 KiB — 23 ms — h2https://www.nps.gov/ADF/thirdParty/jquery/migrate/jquery-migrate-3.4.jswww.nps.gov/ADF/thirdParty/jquery/m... https://www.nps.gov/ADF/thirdParty/jquery/migrate/jquery-migrate-3.4.js — 200 — 10.0 KiB — 21 ms — h2https://www.nps.gov/commonspot/javascript/browser-all.jswww.nps.gov/commonspot/javascript/b... https://www.nps.gov/commonspot/javascript/browser-all.js — 200 — 4.5 KiB — 22 ms — h2https://www.nps.gov/common/commonspot/templates/assets/css/commonspotRTE.csswww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/css/commonspotRTE.css — 200 — 2.1 KiB — 11 ms — h2https://www.nps.gov/common/commonspot/templates/assets/js/app.early.min.js?v=20230112www.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/js/app.early.min.js?v=20230112 — 200 — 73.5 KiB — 36 ms — h2https://www.nps.gov/common/commonspot/templates/js/uswds/uswds-init.jswww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/js/uswds/uswds-init.js — 200 — 546 B — 24 ms — h2https://www.nps.gov/common/commonspot/templates/assets/css/main.min.css?v=20230112www.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/css/main.min.css?v=20230112 — 200 — 921.0 KiB — 43 ms — h2https://fonts.googleapis.com/css?family=Open+Sans:700,600,400|Open+Sans+Condensed:300,700fonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans:700,600,400|Open+Sans+Condensed:300,700 — 200 — 2.4 KiB — 86 ms — h2https://www.nps.gov/common/commonspot/templates/js/federated-analytics-uav1.js?ver=true&agency=DOI&subagency=NPS&exts=rtf,odt,ods,odp,brf&dclink=true&enhlink=truewww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/js/federated-analytics-uav1.js?ver=true&agency=DOI&subagency=NPS&exts=rtf,odt,ods,odp,brf&dclink=true&enhlink=true — 200 — 9.2 KiB — 24 ms — h2https://www.nps.gov/commonspot/commonspot.csswww.nps.gov/commonspot/commonspot.c... https://www.nps.gov/commonspot/commonspot.css — 200 — 4.0 KiB — 16 ms — h2https://www.nps.gov/common/commonspot/templates/assets/icon/us_flag_small.pngwww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/icon/us_flag_small.png — 200 — 760 B — 24 ms — h2https://www.nps.gov/common/commonspot/templates/assets/icon/icon-dot-gov.svgwww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/icon/icon-dot-gov.svg — 200 — 1.1 KiB — 32 ms — h2https://www.nps.gov/common/commonspot/templates/assets/icon/icon-https.svgwww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/icon/icon-https.svg — 200 — 1.2 KiB — 5 ms — h2https://www.nps.gov/common/uploads/grid_builder/crop16_9/BE461F37-F2E8-83B3-0795F29718A7C537.jpg?width=640&quality=90&mode=cropwww.nps.gov/common/uploads/grid_bui... https://www.nps.gov/common/uploads/grid_builder/crop16_9/BE461F37-F2E8-83B3-0795F29718A7C537.jpg?width=640&quality=90&mode=crop — 200 — 87.1 KiB — 6 ms — h2https://www.nps.gov/common/uploads/grid_builder/crop16_9/B7BB51D8-EBC6-1947-180FE3299A23AC79.jpg?width=640&quality=90&mode=cropwww.nps.gov/common/uploads/grid_bui... https://www.nps.gov/common/uploads/grid_builder/crop16_9/B7BB51D8-EBC6-1947-180FE3299A23AC79.jpg?width=640&quality=90&mode=crop — 200 — 79.5 KiB — 8 ms — h2https://www.nps.gov/common/commonspot/templates/js/global.js?v=20230112www.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/js/global.js?v=20230112 — 200 — 21.5 KiB — 6 ms — h2data:image/webp;base64,UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAABBxAR/Q9ERP8DAABWUDggGAAA…data:image/webp;base64,UklGRkoAAABX... data:image/webp;base64,UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAABBxAR/Q9ERP8DAABWUDggGAAA… — 200 — 0 B — 0 ms — datadata:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA/vuUAAA=data:image/webp;base64,UklGRiQAAABX... data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA/vuUAAA= — 200 — 0 B — 0 ms — datahttps://www.nps.gov/common/commonspot/templates/assets/libs/jquery.magnific-popup/jquery.magnific-popup.jswww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/libs/jquery.magnific-popup/jquery.magnific-popup.js — 200 — 13.7 KiB — 5 ms — h2https://www.nps.gov/common/commonspot/templates/assets/js/redesign.js?v=20230112www.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/js/redesign.js?v=20230112 — 200 — 1.6 KiB — 4 ms — h2data:image/webp;base64,UklGRlIAAABXRUJQVlA4WAoAAAASAAAAAAAAAAAAQU5JTQYAAAD/////AABBTk1GJgAAAAAAAAAA…data:image/webp;base64,UklGRlIAAABX... data:image/webp;base64,UklGRlIAAABXRUJQVlA4WAoAAAASAAAAAAAAAAAAQU5JTQYAAAD/////AABBTk1GJgAAAAAAAAAA… — 200 — 0 B — 0 ms — datadata:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAAAAAAfQ//73v/+BiOh/AAA=data:image/webp;base64,UklGRh4AAABX... data:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAAAAAAfQ//73v/+BiOh/AAA= — 200 — 0 B — 0 ms — datahttps://www.nps.gov/common/commonspot/templates/assets/libs/colorbox/colorbox.csswww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/libs/colorbox/colorbox.css — 200 — 1.5 KiB — 22 ms — h2https://www.nps.gov/common/commonspot/templates/js/libs/jquery.colorbox-min.jswww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/js/libs/jquery.colorbox-min.js — 200 — 9.4 KiB — 23 ms — h2https://www.nps.gov/common/commonspot/templates/js/intercept-include.js?v=20230112www.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/js/intercept-include.js?v=20230112 — 200 — 5.1 KiB — 24 ms — h2https://www.nps.gov/common/commonspot/templates/assets/libs/image-map-resizer/imageMapResizer.min.jswww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/libs/image-map-resizer/imageMapResizer.min.js — 200 — 1.4 KiB — 26 ms — h2https://www.nps.gov/common/commonspot/templates/assets/js/app.late.min.js?v=20230112www.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/js/app.late.min.js?v=20230112 — 200 — 679.6 KiB — 189 ms — h2
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https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zd9131934939&_p=1776797902458&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=553607897.1776797903&frm=0&pscdl=noapi&rcb=13&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401&dl=https%3A%2F%2Fnps.gov%2Findex.htm&dt=NPS.gov%20Homepage%20(U.S.%20National%20Park%20Service)&dr=&sid=1776797902&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&ep.agency=DOI&ep.subagency=NPS&ep.site_topic=unspecified%3Anps.gov&ep.site_platform=unspecified%3Anps.gov&ep.script_source=https%3A%2F%2Fnps.gov%2Fcommon%2Fcommonspot%2Ftemplates%2Fjs%2Ffederated-analytics-uav1.js&ep.version=20250212%20v8.6%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=nps.gov&tfd=1198 — 204 — 547 B — 89 ms — h2https://script.crazyegg.com/pages/data-scripts/0090/6260/site/www.nps.gov.json?t=1script.crazyegg.com/pages/data-scri... https://script.crazyegg.com/pages/data-scripts/0090/6260/site/www.nps.gov.json?t=1 — 200 — 745 B — 46 ms — h3https://www.nps.gov/common/commonspot/templates/images/icons/favicon.icowww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/images/icons/favicon.ico — 200 — 1.2 KiB — 4 ms — h2https://www.nps.gov/common/commonspot/templates/assets/icon/AppIcon-144px.pngwww.nps.gov/common/commonspot/templ... https://www.nps.gov/common/commonspot/templates/assets/icon/AppIcon-144px.png — 200 — 22.5 KiB — 5 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 2118ms · 945KB · $28/mo
Unattributable
Other
Costly
Execution 628ms
Transfer 0 KB
Monthly Cost $8/mo
www.nps.gov
Other
Costly
Execution 525ms
Transfer 13 KB
Monthly Cost $7/mo
www.nps.gov
Other
Costly
Execution 442ms
Transfer 680 KB
Unused 60%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Optional
Execution 200ms
Transfer 148 KB
Unused 41%
Monthly Cost $3/mo
www.nps.gov
Other
Optional
Execution 168ms
Transfer 31 KB
Monthly Cost $2/mo
www.nps.gov
Other
Optional
Execution 155ms
Transfer 74 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 628ms and costs ~$8/month
  • www.nps.gov adds 525ms and costs ~$7/month
  • www.nps.gov adds 442ms and costs ~$6/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 628ms 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.nps.gov takes 525ms 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.nps.gov takes 442ms 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

60% of www.nps.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

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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