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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
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.
83
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.

1.19 s

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

1.75 s

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

108 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.

1.22 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.

3.25 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
5 PASS 4 REVIEW 4 FIX
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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
20 scripts, 558 KB unused
FIX
20 scripts, 558 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-0KHC...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Z0BE...: 66 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JSGC...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NPRS...: 65 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 558 KB
558 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64k0h2147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0KHCNR6KSZ&cx=c&gtm=4e64k0h2158 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-Z0BESEZFL2&cx=c&gtm=4e64k0h2160 KB66 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JSGC9Q8KRE&cx=c&gtm=4e64k0h2157 KB65 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NPRSVNG84W&cx=c&_slc=1147 KB65 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WLMC86164 KB50 KB (30%)✓3rd
https://www.archives.gov/files/js/js_lBihdeJYQAyc3cvG-bzBMa_r_tJJ39unyQ2vVwtPQ9Y.js64 KB48 KB (76%)✗3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB30 KB (54%)✓3rd
https://script.crazyegg.com/pages/scripts/0034/3988.js3 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
95 resources · 1.9 MB · 558 KB savings available
FIX
95 resources · 1.9 MB · 558 KB savings available
Warning::
Page weight 946 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~558 KB of savings available
Warning::
94 third-party resources (100% of weight)
95 resources · 1.9 MiB · 94 third-party 946.0 KiB over 1MB target
JavaScript 68% · 1.3 MiB
Image 18% · 355.5 KiB
Font 8% · 154.2 KiB
CSS 5% · 95.6 KiB
Other 0% · 9.5 KiB
Document 0% · 9.4 KiB

~558.4 KiB of savings available

Remove unused JavaScript: 558.4 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
Page Weight Budget
Action
1.9 MB transferred, 95 requests
REVIEW
1.9 MB transferred, 95 requests
Info::
Page weighs 5.1 MB (1.9 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
95 HTTP requests
Info::
Estimated 0.40 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
95 requests
0.40 g CO2 per page load
JavaScript 1.3 MiB 68%
Images 341.7 KiB 17%
Fonts 154.2 KiB 8%
CSS 95.6 KiB 5%
Other 14.2 KiB 1%
Other 8.9 KiB 0%
HTML 8.9 KiB 0%
Other 658 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://www.archives.gov/files/a250/freedom-250.sv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 342 KB
0 oversized -0 KB
19 legacy format
1 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

B
JS Execution Cost
906ms total JS execution
REVIEW
906ms total JS execution
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WLM...: 154ms CPU time
Info::
Unattributable: 148ms CPU time
Info::
https://www.archives.gov/: 124ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-JSGC...: 113ms CPU time
Info::
https://script.crazyegg.com/pages/versioned/common...: 72ms CPU time
Warning::
Third-party scripts: 906ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 17% Script Parsing & Compilation 11% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-WLMC86154ms132ms20ms3rd
Unattributable148ms2ms0ms3rd
https://www.archives.gov/124ms2ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JSGC9Q8KRE&cx=c&gtm=4e64k0h2113ms86ms27ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js72ms55ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0KHCNR6KSZ&cx=c&gtm=4e64k0h263ms52ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L59ms50ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Z0BESEZFL2&cx=c&gtm=4e64k0h259ms48ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NPRSVNG84W&cx=c&_slc=158ms49ms9ms3rd
https://www.archives.gov/files/js/js_XexEZhbTmj1BHeajKr2rPfyR8Y68f4rm0Nv3Vj5_dSI.js57ms40ms3ms3rd
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
5 fonts (154 KB)
PASS
5 fonts (154 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

154 KB total

Render-blocking

0

of 5

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 FCP 1.2 s LCP 1.7 shttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff26xK3dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK3dSBYKcSV-LCoeQqfX1RYOo3qOK7lujVj9w.woff2 — 14.5 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff26xKydSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xKydSBYKcSV-LCoeQqfX1RYOo3ig4vwlxdu3cOWxw.woff2 — 14.4 KiB — 47 ms — font-display: swaphttps://fonts.gstatic.com/s/merriweather/v33/u-4D0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiScCmDxhtNOKl8yDr3icaFF31CPDaYKfF.woff2u-4D0qyriQwlOrhSvowK_l5... https://fonts.gstatic.com/s/merriweather/v33/u-4D0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiScCmDxhtNOKl8yDr3icaFF31CPDaYKfF.woff2 — 47.9 KiB — 63 ms — font-display: swaphttps://www.archives.gov/sites/all/modules/custom/archives_ui/fonts/fontawesome-webfont.woff2?v=4.4.0fontawesome-webfont.woff2 https://www.archives.gov/sites/all/modules/custom/archives_ui/fonts/fontawesome-webfont.woff2?v=4.4.0 — 63.4 KiB — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff26xK1dSBYKcSV-LCoeQqfX1R... https://fonts.gstatic.com/s/sourcesanspro/v23/6xK1dSBYKcSV-LCoeQqfX1RYOo3qPZ7nsDJB9cme.woff2 — 13.9 KiB — 34 ms — font-display: swap
6xK3dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 15 KB
Load time 52 ms
Start 782 ms
Risk FOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 47 ms
Start 783 ms
Risk FOUT — text flashes from fallback to web font
u-4D0qyriQwlOrhSvowK_l5... woff2 swap
Size 48 KB
Load time 63 ms
Start 783 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 63 KB
Load time 25 ms
Start 783 ms
Risk FOUT — text flashes from fallback to web font
6xK1dSBYKcSV-LCoeQqfX1R... woff2 swap
Size 14 KB
Load time 34 ms
Start 783 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
95 requests over 1870ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.7 shttps://archives.gov// https://archives.gov/ — 301 — 506 B — 456 ms — http/1.1https://www.archives.gov/www.archives.gov/ https://www.archives.gov/ — 200 — 7.9 KiB — 67 ms — h2https://www.archives.gov/modules/system/system.base.css?tdtmw3www.archives.gov/modules/system/sys... https://www.archives.gov/modules/system/system.base.css?tdtmw3 — 200 — 2.3 KiB — 86 ms — h2https://www.archives.gov/sites/all/modules/custom/archives_ui/css/font-awesome.min.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/archives_ui/css/font-awesome.min.css?tdtmw3 — 200 — 6.4 KiB — 82 ms — h2https://www.archives.gov/sites/all/modules/custom/archives_ui/css/helptext.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/archives_ui/css/helptext.css?tdtmw3 — 200 — 683 B — 83 ms — h2https://www.archives.gov/sites/all/modules/custom/archives_ui/css/ckeditor_custom.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/archives_ui/css/ckeditor_custom.css?tdtmw3 — 200 — 753 B — 80 ms — h2https://www.archives.gov/sites/all/modules/contrib/calendar/css/calendar_multiday.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/contrib/calendar/css/calendar_multiday.css?tdtmw3 — 200 — 4.0 KiB — 81 ms — h2https://www.archives.gov/sites/all/modules/contrib/date/date_repeat_field/date_repeat_field.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/contrib/date/date_repeat_field/date_repeat_field.css?tdtmw3 — 200 — 1.0 KiB — 81 ms — h2https://www.archives.gov/modules/field/theme/field.css?tdtmw3www.archives.gov/modules/field/them... https://www.archives.gov/modules/field/theme/field.css?tdtmw3 — 200 — 707 B — 81 ms — h2https://www.archives.gov/sites/all/modules/custom/findingaid_stat/css/findingaid.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/findingaid_stat/css/findingaid.css?tdtmw3 — 200 — 2.6 KiB — 81 ms — h2https://www.archives.gov/sites/all/modules/custom/findingaid_stat/css/explorer_landing.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/findingaid_stat/css/explorer_landing.css?tdtmw3 — 200 — 2.5 KiB — 95 ms — h2https://www.archives.gov/sites/all/modules/custom/nara_catalog/css/nara-api-style.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/nara_catalog/css/nara-api-style.css?tdtmw3 — 200 — 955 B — 81 ms — h2https://www.archives.gov/sites/all/modules/custom/nara_document_app/css/documentapp.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/nara_document_app/css/documentapp.css?tdtmw3 — 200 — 684 B — 81 ms — h2https://www.archives.gov/sites/all/modules/archive_features/nara_timeline/css/custom.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/archive_features/nara_timeline/css/custom.css?tdtmw3 — 200 — 1.5 KiB — 102 ms — h2https://www.archives.gov/sites/all/modules/archive_features/nara_timeline/css/timeline.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/archive_features/nara_timeline/css/timeline.css?tdtmw3 — 200 — 414 B — 61 ms — h2https://www.archives.gov/modules/node/node.css?tdtmw3www.archives.gov/modules/node/node.... https://www.archives.gov/modules/node/node.css?tdtmw3 — 200 — 581 B — 81 ms — h2https://www.archives.gov/sites/all/modules/contrib/user_alert/css/user-alert.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/contrib/user_alert/css/user-alert.css?tdtmw3 — 200 — 722 B — 80 ms — h2https://www.archives.gov/sites/all/modules/custom/varnish_purge/css/varnishpurge.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/varnish_purge/css/varnishpurge.css?tdtmw3 — 200 — 1.1 KiB — 80 ms — h2https://www.archives.gov/sites/all/modules/contrib/views/css/views.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/contrib/views/css/views.css?tdtmw3 — 200 — 780 B — 79 ms — h2https://www.archives.gov/sites/all/modules/contrib/ckeditor/css/ckeditor.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/contrib/ckeditor/css/ckeditor.css?tdtmw3 — 200 — 659 B — 80 ms — h2https://www.archives.gov/sites/all/modules/contrib/ctools/css/ctools.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/contrib/ctools/css/ctools.css?tdtmw3 — 200 — 720 B — 79 ms — h2https://www.archives.gov/sites/all/modules/custom/archives_floating_block/css/floating-block.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/archives_floating_block/css/floating-block.css?tdtmw3 — 200 — 1.3 KiB — 80 ms — h2https://www.archives.gov/sites/all/modules/custom/nara_custom/css/nara_custom.css?tdtmw3www.archives.gov/sites/all/modules/... https://www.archives.gov/sites/all/modules/custom/nara_custom/css/nara_custom.css?tdtmw3 — 200 — 640 B — 92 ms — h2https://www.archives.gov/sites/all/themes/nara/css/jquery.fancybox.css?tdtmw3www.archives.gov/sites/all/themes/n... https://www.archives.gov/sites/all/themes/nara/css/jquery.fancybox.css?tdtmw3 — 200 — 1.9 KiB — 91 ms — h2https://www.archives.gov/sites/all/themes/nara/css/jquery.fancybox-thumbs.css?tdtmw3www.archives.gov/sites/all/themes/n... https://www.archives.gov/sites/all/themes/nara/css/jquery.fancybox-thumbs.css?tdtmw3 — 200 — 820 B — 98 ms — h2https://www.archives.gov/sites/all/themes/nara/css/bootstrap.min.css?tdtmw3www.archives.gov/sites/all/themes/n... https://www.archives.gov/sites/all/themes/nara/css/bootstrap.min.css?tdtmw3 — 200 — 18.2 KiB — 103 ms — h2https://www.archives.gov/sites/all/themes/nara/css/styles.css?tdtmw3www.archives.gov/sites/all/themes/n... https://www.archives.gov/sites/all/themes/nara/css/styles.css?tdtmw3 — 200 — 34.0 KiB — 107 ms — h2https://www.archives.gov/sites/all/themes/nara/css/vertical-tabs.css?tdtmw3www.archives.gov/sites/all/themes/n... https://www.archives.gov/sites/all/themes/nara/css/vertical-tabs.css?tdtmw3 — 200 — 1.3 KiB — 98 ms — h2https://www.archives.gov/sites/all/themes/nara/css/overrides.css?tdtmw3www.archives.gov/sites/all/themes/n... https://www.archives.gov/sites/all/themes/nara/css/overrides.css?tdtmw3 — 200 — 1.8 KiB — 98 ms — h2https://www.archives.gov/sites/all/themes/nara/css/mediagallery.css?tdtmw3www.archives.gov/sites/all/themes/n... https://www.archives.gov/sites/all/themes/nara/css/mediagallery.css?tdtmw3 — 200 — 2.3 KiB — 98 ms — h2
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h3https://region1.google-analytics.com/g/collect?v=2&tid=G-0KHCNR6KSZ&gtm=45je64k0h2v9124866276z871638650za20gzb71638650zd71638650&_p=1776799359107&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&_eu=EA&are=1&cid=221411709.1776799360&frm=0&ir=1&pscdl=noapi&rcb=8&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=0~115938465~115938469~117266400&sid=1776799359&sct=1&seg=0&dl=https%3A%2F%2Fwww.archives.gov%2F&dt=National%20Archives%20%7C%20Home&en=page_view&_fv=1&_ss=1&tfd=1302region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-0KHCNR6KSZ&gtm=45je64k0h2v9124866276z871638650za20gzb71638650zd71638650&_p=1776799359107&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&_eu=EA&are=1&cid=221411709.1776799360&frm=0&ir=1&pscdl=noapi&rcb=8&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=0~115938465~115938469~117266400&sid=1776799359&sct=1&seg=0&dl=https%3A%2F%2Fwww.archives.gov%2F&dt=National%20Archives%20%7C%20Home&en=page_view&_fv=1&_ss=1&tfd=1302 — 204 — 48 B — 41 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1326454116&t=pageview&_s=1&dl=https%3A%2F%2Fwww.archives.gov%2F&ul=en-us&dt=National%20Archives%20%7C%20Home&sr=800x600&vp=1350x940&_u=YADAAAABAAAAAC~&jid=1930352172&gjid=1120736830&cid=221411709.1776799360&tid=UA-72079228-1&_gid=1227712432.1776799360&_r=1&_slc=1&gtm=45He64k0h2n71WLMC86v71638650za200zd71638650&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=246416138www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1326454116&t=pageview&_s=1&dl=https%3A%2F%2Fwww.archives.gov%2F&ul=en-us&dt=National%20Archives%20%7C%20Home&sr=800x600&vp=1350x940&_u=YADAAAABAAAAAC~&jid=1930352172&gjid=1120736830&cid=221411709.1776799360&tid=UA-72079228-1&_gid=1227712432.1776799360&_r=1&_slc=1&gtm=45He64k0h2n71WLMC86v71638650za200zd71638650&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=246416138 — 200 — 466 B — 25 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1326454116&t=pageview&_s=1&dl=https%3A%2F%2Fwww.archives.gov%2F&ul=en-us&dt=National%20Archives%20%7C%20Home&sr=800x600&vp=1350x940&_u=YADAAAABAAAAAC~&jid=1855230485&gjid=638072934&cid=221411709.1776799360&tid=UA-182127501-1&_gid=1227712432.1776799360&_r=1&_slc=1&gtm=45He64k0h2n71WLMC86v71638650za200zd71638650&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=1607840988www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1326454116&t=pageview&_s=1&dl=https%3A%2F%2Fwww.archives.gov%2F&ul=en-us&dt=National%20Archives%20%7C%20Home&sr=800x600&vp=1350x940&_u=YADAAAABAAAAAC~&jid=1855230485&gjid=638072934&cid=221411709.1776799360&tid=UA-182127501-1&_gid=1227712432.1776799360&_r=1&_slc=1&gtm=45He64k0h2n71WLMC86v71638650za200zd71638650&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=1607840988 — 200 — 73 B — 27 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1326454116&t=pageview&_s=1&dl=https%3A%2F%2Fwww.archives.gov%2F&ul=en-us&dt=National%20Archives%20%7C%20Home&sr=800x600&vp=1350x940&_u=YADAAEABAAAAACAAI~&jid=1722298854&gjid=748832051&cid=221411709.1776799360&tid=UA-114045448-1&_gid=1227712432.1776799360&_r=1&_slc=1&gtm=45He64k0h2n71WLMC86v71638650za200zd71638650&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=363670136www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1326454116&t=pageview&_s=1&dl=https%3A%2F%2Fwww.archives.gov%2F&ul=en-us&dt=National%20Archives%20%7C%20Home&sr=800x600&vp=1350x940&_u=YADAAEABAAAAACAAI~&jid=1722298854&gjid=748832051&cid=221411709.1776799360&tid=UA-114045448-1&_gid=1227712432.1776799360&_r=1&_slc=1&gtm=45He64k0h2n71WLMC86v71638650za200zd71638650&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=363670136 — 200 — 83 B — 24 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1326454116&t=pageview&_s=1&dl=https%3A%2F%2Fwww.archives.gov%2F&ul=en-us&dt=National%20Archives%20%7C%20Home&sr=800x600&vp=1350x940&_u=YCDACEABBAAAACAAI~&jid=1126265241&gjid=123955998&cid=221411709.1776799360&tid=UA-17592594-8&_gid=1227712432.1776799360&_r=1&_slc=1&gtm=45He64k0h2n71WLMC86v71638650za200zd71638650&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=1926010158www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1326454116&t=pageview&_s=1&dl=https%3A%2F%2Fwww.archives.gov%2F&ul=en-us&dt=National%20Archives%20%7C%20Home&sr=800x600&vp=1350x940&_u=YCDACEABBAAAACAAI~&jid=1126265241&gjid=123955998&cid=221411709.1776799360&tid=UA-17592594-8&_gid=1227712432.1776799360&_r=1&_slc=1&gtm=45He64k0h2n71WLMC86v71638650za200zd71638650&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400~118463262&npa=1&z=1926010158 — 200 — 71 B — 25 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-Z0BESEZFL2&gtm=45je64k0h2v9122141610z871638650za20gzb71638650zd71638650&_p=1776799359107&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=221411709.1776799360&frm=0&pscdl=noapi&rcb=7&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=0~115938465~115938468~117266400~117384406~118463261&sid=1776799359&sct=1&seg=0&dl=https%3A%2F%2Fwww.archives.gov%2F&dt=National%20Archives%20%7C%20Home&en=page_view&_fv=1&_ss=1&tfd=1399region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-Z0BESEZFL2&gtm=45je64k0h2v9122141610z871638650za20gzb71638650zd71638650&_p=1776799359107&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=221411709.1776799360&frm=0&pscdl=noapi&rcb=7&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=0~115938465~115938468~117266400~117384406~118463261&sid=1776799359&sct=1&seg=0&dl=https%3A%2F%2Fwww.archives.gov%2F&dt=National%20Archives%20%7C%20Home&en=page_view&_fv=1&_ss=1&tfd=1399 — 204 — 20 B — 77 ms — h3https://www.googletagmanager.com/gtag/js?id=G-NPRSVNG84W&cx=c&_slc=1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-NPRSVNG84W&cx=c&_slc=1 — 200 — 147.5 KiB — 42 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb71638650zd71638650&_p=1776799359107&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=221411709.1776799360&frm=0&pscdl=noapi&rcb=18&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=0~115938465~115938469~117266401&dl=https%3A%2F%2Farchives.gov%2F&dt=National%20Archives%20%7C%20Home&dr=&sid=1776799360&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=NARA&ep.subagency=ARCHIVES.GOV&ep.site_topic=unspecified%3Aarchives.gov&ep.site_platform=unspecified%3Aarchives.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=archives.gov&tfd=1469region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb71638650zd71638650&_p=1776799359107&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=221411709.1776799360&frm=0&pscdl=noapi&rcb=18&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=0~115938465~115938469~117266401&dl=https%3A%2F%2Farchives.gov%2F&dt=National%20Archives%20%7C%20Home&dr=&sid=1776799360&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=NARA&ep.subagency=ARCHIVES.GOV&ep.site_topic=unspecified%3Aarchives.gov&ep.site_platform=unspecified%3Aarchives.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=archives.gov&tfd=1469 — 204 — 20 B — 50 ms — h3https://script.crazyegg.com/pages/data-scripts/0034/3988/sampling/www.archives.gov.json?t=1script.crazyegg.com/pages/data-scri... https://script.crazyegg.com/pages/data-scripts/0034/3988/sampling/www.archives.gov.json?t=1 — 200 — 357 B — 27 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-NPRSVNG84W&gtm=45je64k0h2v9126413479za20g&_p=1776799359107&gcd=13l3l3l2l3l1&npa=1&dma_cps=a&dma=1&_eu=EBAI&are=1&cid=221411709.1776799360&frm=0&ir=1&pscdl=noapi&rcb=17&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=0~115938465~115938469~117266400&dl=https%3A%2F%2Fwww.archives.gov%2F&dt=National%20Archives%20%7C%20Home&sid=1776799360&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&gap.uat=0~115938465~115938469~117266400~118463262&tfd=1579region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-NPRSVNG84W&gtm=45je64k0h2v9126413479za20g&_p=1776799359107&gcd=13l3l3l2l3l1&npa=1&dma_cps=a&dma=1&_eu=EBAI&are=1&cid=221411709.1776799360&frm=0&ir=1&pscdl=noapi&rcb=17&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=0~115938465~115938469~117266400&dl=https%3A%2F%2Fwww.archives.gov%2F&dt=National%20Archives%20%7C%20Home&sid=1776799360&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&gap.uat=0~115938465~115938469~117266400~118463262&tfd=1579 — 204 — 20 B — 54 ms — h3https://tracking.crazyegg.com/clock?u=343988&st=183573&t=1776799360178&tk=193ac5d9f11dc71e186501834c5d0a79tracking.crazyegg.com/clock?u=34398... https://tracking.crazyegg.com/clock?u=343988&st=183573&t=1776799360178&tk=193ac5d9f11dc71e186501834c5d0a79 — 204 — 0 B — 139 ms — h2https://www.archives.gov/files/apple-icon.pngwww.archives.gov/files/apple-icon.p... https://www.archives.gov/files/apple-icon.png — 200 — 13.8 KiB — 25 ms — h2https://tracking.crazyegg.com/clock?u=343988&st=183573&t=1776799360178&tk=193ac5d9f11dc71e186501834c5d0a79tracking.crazyegg.com/clock?u=34398... https://tracking.crazyegg.com/clock?u=343988&st=183573&t=1776799360178&tk=193ac5d9f11dc71e186501834c5d0a79 — 200 — 147 B — 80 ms — h2https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.jsscript.crazyegg.com/pages/versioned... https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js — 200 — 22.6 KiB — 25 ms — h3
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 906ms · 1043KB · $5/mo
Google Tag Manager
Tag Manager
Optional
Execution 154ms
Transfer 164 KB
Unused 30%
Monthly Cost $1/mo
Unattributable
Other
Optional
Execution 148ms
Transfer 0 KB
Monthly Cost $1/mo
www.archives.gov
Other
Optional
Execution 124ms
Transfer 8 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 113ms
Transfer 157 KB
Unused 41%
Monthly Cost $1/mo
script.crazyegg.com
Other
Optional
Execution 72ms
Transfer 55 KB
Unused 54%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 158 KB
Unused 42%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 147 KB
Unused 42%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 160 KB
Unused 41%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 147 KB
Unused 44%
Monthly Cost $0/mo
www.archives.gov
Other
Optional
Execution 57ms
Transfer 46 KB
Monthly Cost $0/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

54% of script.crazyegg.com'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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