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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
69
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.

1.83 s

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

4.23 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.

0.014

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

1.83 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.

4.30 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
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
5.1 MB transferred, 79 requests
FIX
5.1 MB transferred, 79 requests
Critical::
Page weighs 11.6 MB (5.1 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 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 934 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 934 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::
79 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.1 MB / 2.4 MB budget
5.1 MB transferred
79 requests
1.1 g CO2 per page load
Images 2.7 MiB 52%
JavaScript 1.0 MiB 21%
CSS 934.3 KiB 18%
Fonts 337.5 KiB 6%
Other 118.0 KiB 2%
HTML 13.4 KiB 0%
Other 2.5 KiB 0%
Other 901 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 (5.1 MiB of 5.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
79 resources · 5.1 MB · 265 KB savings available
FIX
79 resources · 5.1 MB · 265 KB savings available
Warning::
Page weight 4.1 MB over 1MB target
Got: 5.1 MB Expected: ≤ 1 MB
Info::
~265 KB of savings available
Warning::
78 third-party resources (100% of weight)
Info::
6 resources over 200KB
79 resources · 5.1 MiB · 78 third-party 4.1 MiB over 1MB target
Image 55% · 2.8 MiB
JavaScript 21% · 1.0 MiB
CSS 18% · 934.3 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
37 images, 0 KB saveable
REVIEW
37 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/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.
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/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.
37 images 2.7 MB
0 oversized -0 KB
33 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+
JS Execution Cost
456ms total JS execution
PASS
456ms total JS execution
Info::
Unattributable: 157ms CPU time
Info::
https://www.nps.gov/index.htm: 126ms CPU time
Info::
https://www.nps.gov/common/commonspot/templates/as...: 112ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 61ms CPU time
Warning::
Third-party scripts: 456ms (100% of total)

Main Thread Breakdown

Script Evaluation 28% Other 28% Script Parsing & Compilation 18% Style & Layout 18% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
Unattributable157ms2ms0ms3rd
https://www.nps.gov/index.htm126ms2ms1ms3rd
https://www.nps.gov/common/commonspot/templates/assets/js/app.late.min.js?v=20230112112ms35ms76ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L61ms49ms12ms3rd
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 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.8 s LCP 4.2 sdata:font/woff2;base64,d09GMgABAAAABUX0ABMAAAANNCAABUV6AAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGsAQG4jcEhyB…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAABUX0ABMAAAANNCAABUV6AAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGsAQG4jcEhyB… — 337.5 KiB — 148 ms — font-display: swap
woff2;base64,d09GMgABAA... woff2 swap
Size 337 KB
Load time 148 ms
Start 772 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
Network Waterfall
79 requests over 1290ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.8 s LCP 4.2 shttps://nps.gov// https://nps.gov/ — 301 — 343 B — 608 ms — http/1.1https://www.nps.gov/www.nps.gov/ https://www.nps.gov/ — 302 — 289 B — 8 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 — 22 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 — 15 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 — 15 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 — 19 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 — 544 B — 28 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 — 920.9 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 — 82 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 — 28 ms — h2https://www.nps.gov/commonspot/commonspot.csswww.nps.gov/commonspot/commonspot.c... https://www.nps.gov/commonspot/commonspot.css — 200 — 4.0 KiB — 24 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 — 28 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 — 29 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 — 7 ms — h2https://www.nps.gov/common/uploads/grid_builder/crop16_9/BE461F37-F2E8-83B3-0795F29718A7C537.jpg?width=420&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=420&quality=90&mode=crop — 200 — 40.9 KiB — 9 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/uploads/grid_builder/crop16_9/B7BB51D8-EBC6-1947-180FE3299A23AC79.jpg?width=420&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=420&quality=90&mode=crop — 200 — 35.8 KiB — 7 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 — 5 ms — h2https://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 — 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/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 — 6 ms — h2https://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 — 25 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 — 26 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 — 27 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 — 28 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 — 228 ms — h2
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https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zd9131934939&_p=1776797923022&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1192813298.1776797923&frm=0&pscdl=noapi&rcb=3&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=0~115938466~115938468~117266401&dl=https%3A%2F%2Fnps.gov%2Findex.htm&dt=NPS.gov%20Homepage%20(U.S.%20National%20Park%20Service)&dr=&sid=1776797923&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=1221 — 204 — 547 B — 68 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 — 44 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 456ms · 840KB · $6/mo
Unattributable
Other
Optional
Execution 157ms
Transfer 0 KB
Monthly Cost $2/mo
www.nps.gov
Other
Optional
Execution 126ms
Transfer 13 KB
Monthly Cost $2/mo
www.nps.gov
Other
Optional
Execution 112ms
Transfer 680 KB
Unused 60%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 148 KB
Unused 41%
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

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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