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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
6
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.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

947 ms

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

1.79 s

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

15 ms

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

0.026

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

1.77 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.87 s

Page Load Progression

684 ms
1.4 s
2.1 s
2.7 s
3.4 s
4.1 s
4.8 s
5.5 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
18.7 MB transferred, 98 requests
FIX
18.7 MB transferred, 98 requests
Critical::
Page weighs 21.3 MB (18.7 MB transferred)
Warning::
JavaScript is 1012 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1012 KB
Info::
98 HTTP requests
Info::
Estimated 3.9 g CO2 per page load
18.7 MB / 2.4 MB budget
18.7 MB transferred
98 requests
3.9 g CO2 per page load
Other 16.5 MiB 88%
JavaScript 1011.6 KiB 5%
Images 958.3 KiB 5%
Fonts 117.5 KiB 1%
CSS 92.6 KiB 0%
Other 30.8 KiB 0%
HTML 28.5 KiB 0%
Other 3.5 KiB 0%
Other 0 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

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 (18.7 MiB of 18.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
98 resources · 18.7 MB · 259 KB savings available
FIX
98 resources · 18.7 MB · 259 KB savings available
Warning::
Page weight 17.7 MB over 1MB target
Got: 18.7 MB Expected: ≤ 1 MB
Info::
~259 KB of savings available
Warning::
97 third-party resources (100% of weight)
Info::
11 resources over 200KB
98 resources · 18.7 MiB · 97 third-party 17.7 MiB over 1MB target
Media 88% · 16.5 MiB
JavaScript 5% · 1011.6 KiB
Image 5% · 988.9 KiB
Font 1% · 117.5 KiB
CSS 0% · 92.6 KiB
Document 0% · 28.5 KiB
Other 0% · 6.4 KiB

~259.4 KiB of savings available

Remove unused JavaScript: 259.4 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.

B
Image Optimization
40 images, 0 KB saveable
REVIEW
40 images, 0 KB saveable
Info::
All images are well-optimized
40 images 958 KB
0 oversized -0 KB
36 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
799ms total JS execution
REVIEW
799ms total JS execution
Warning::
https://www.nist.gov/: 348ms CPU time
Info::
Unattributable: 195ms CPU time
Info::
https://www.nist.gov/cdn-cgi/challenge-platform/sc...: 70ms CPU time
Info::
https://www.nist.gov/sites/default/files/js/js_2I-...: 63ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HEQ0...: 63ms CPU time
Warning::
Third-party scripts: 799ms (100% of total)

Main Thread Breakdown

Script Evaluation 34% Other 34% Style & Layout 18% Script Parsing & Compilation 6% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.nist.gov/348ms17ms3ms3rd
Unattributable195ms38ms0ms3rd
https://www.nist.gov/cdn-cgi/challenge-platform/scripts/jsd/main.js70ms66ms1ms3rd
https://www.nist.gov/sites/default/files/js/js_2I-3XaXSiWCMKsbSi_iqn5nUWVLdDn_In3NULJj1M6Y.js?scope=footer&delta=0&language=en&theme=nist_www&include=eJxljmEOgzAIhS_UyZEItVg7aTFtTT3-OnWJ2_4AHzzg0VYVKY2z5gJ0A2NpXLBz1RVuNT6L4b1KSAu4vK0kw4XGq3phrOTB9_DLAz1p_25Gk0Kp4EUtyaNfPnBmcpw_iFPoeqctiZLDmruXkPo2neOVPOPE7N4m4b91qurMsX9VFUsZozpwoZDtlw_rh6a1drPS2E6aI1x5cIFE_QuuxnZ363ms32ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HEQ0YF2VYL&cx=c&gtm=4e64f063ms47ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f060ms49ms11ms3rd
C
JS Bundles
Action
16 scripts, 259 KB unused
REVIEW
16 scripts, 259 KB unused
Warning::
https://www.nist.gov/sites/default/files/js/js_2I-...: 67 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HEQ0...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 64 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-54V...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 259 KB
259 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nist.gov/sites/default/files/js/js_2I-3XaXSiWCMKsbSi_iqn5nUWVLdDn_In3NULJj1M6Y.js?scope=footer&delta=0&language=en&theme=nist_www&include=eJxljmEOgzAIhS_UyZEItVg7aTFtTT3-OnWJ2_4AHzzg0VYVKY2z5gJ0A2NpXLBz1RVuNT6L4b1KSAu4vK0kw4XGq3phrOTB9_DLAz1p_25Gk0Kp4EUtyaNfPnBmcpw_iFPoeqctiZLDmruXkPo2neOVPOPE7N4m4b91qurMsX9VFUsZozpwoZDtlw_rh6a1drPS2E6aI1x5cIFE_QuuxnZ399 KB67 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HEQ0YF2VYL&cx=c&gtm=4e64f0156 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f0147 KB64 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-54VSXXDF117 KB63 KB (54%)✓3rd
https://customer-ltx6ylk10sje63q6.cloudflarestream.com/embed/sdk-iframe-integration.fla9.latest.js343 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.nist.gov/sites/default/files/js/js_5WbAeKWaHF5M7ZGOm0J4MoiuVLINg4UjWTVpVV4wxTc.js?scope=header&delta=3&language=en&theme=nist_www&include=eJxljmEOgzAIhS_UyZEItVg7aTFtTT3-OnWJ2_4AHzzg0VYVKY2z5gJ0A2NpXLBz1RVuNT6L4b1KSAu4vK0kw4XGq3phrOTB9_DLAz1p_25Gk0Kp4EUtyaNfPnBmcpw_iFPoeqctiZLDmruXkPo2neOVPOPE7N4m4b91qurMsX9VFUsZozpwoZDtlw_rh6a1drPS2E6aI1x5cIFE_QuuxnZ30 KB—✓3rd
https://www.nist.gov/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓3rd
https://www.nist.gov/sites/default/files/js/js_agndrownnWbPAxUFhN_wUh92DTsaknXJLh63K4qujWA.js?scope=header&delta=0&language=en&theme=nist_www&include=eJxljmEOgzAIhS_UyZEItVg7aTFtTT3-OnWJ2_4AHzzg0VYVKY2z5gJ0A2NpXLBz1RVuNT6L4b1KSAu4vK0kw4XGq3phrOTB9_DLAz1p_25Gk0Kp4EUtyaNfPnBmcpw_iFPoeqctiZLDmruXkPo2neOVPOPE7N4m4b91qurMsX9VFUsZozpwoZDtlw_rh6a1drPS2E6aI1x5cIFE_QuuxnZ30 KB—✓3rd
https://www.nist.gov/modules/contrib/google_tag/js/gtm.js?tdl75h1 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

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
6 fonts (118 KB)
PASS
6 fonts (118 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

118 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 947 ms LCP 1.8 shttps://www.nist.gov/libraries/nist-component-library/dist/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.nist.gov/libraries/nist-component-library/dist/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.3 KiB — 130 ms — font-display: swaphttps://www.nist.gov/libraries/nist-component-library/dist/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.nist.gov/libraries/nist-component-library/dist/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.1 KiB — 138 ms — font-display: swaphttps://www.nist.gov/libraries/nist-component-library/dist/fonts/source-sans-pro/sourcesanspro-semibold-webfont.woff2sourcesanspro-semibold-... https://www.nist.gov/libraries/nist-component-library/dist/fonts/source-sans-pro/sourcesanspro-semibold-webfont.woff2 — 20.2 KiB — 153 ms — font-display: swaphttps://www.nist.gov/libraries/nist-component-library/dist/fonts/source-sans-pro/sourcesanspro-bolditalic-webfont.woff2sourcesanspro-bolditali... https://www.nist.gov/libraries/nist-component-library/dist/fonts/source-sans-pro/sourcesanspro-bolditalic-webfont.woff2 — 16.2 KiB — 145 ms — font-display: swaphttps://time.gov/web/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://time.gov/web/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.5 KiB — 553 ms — font-display: swaphttps://time.gov/web/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://time.gov/web/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.3 KiB — 558 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 130 ms
Start 825 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 138 ms
Start 825 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-semibold-... woff2 swap
Size 20 KB
Load time 153 ms
Start 825 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bolditali... woff2 swap
Size 16 KB
Load time 145 ms
Start 825 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-regular-w... woff2 swap
Size 21 KB
Load time 553 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 558 ms
Start 1.7 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)
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
98 requests over 3998ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 947 ms LCP 1.8 shttps://nist.gov// https://nist.gov/ — 301 — 93 B — 384 ms — h2https://www.nist.gov/www.nist.gov/ https://www.nist.gov/ — 200 — 26.2 KiB — 122 ms — h2https://www.nist.gov/sites/default/files/css/css_ykRiQh7fbub2hQuiIONx4rSV6sltctH8e4um76kZYCg.css?delta=0&language=en&theme=nist_www&include=eJxlj9EOwiAMRX-IyCc1BSrgCiXAwvx7mVOzxbd7TprbFtcugNkGqU3jCZRBu8DkLkWfMkQrWVmppF1dC_INH7hdhIvI4hVtnWNevvaDKsfWtWcxyO8MBT3BncjtW_S_OqZ6oETzAGGDFZI47WJDwwS_VhhjXJp3DpJor1Pt2Tql-UqjFx-_YAowww.nist.gov/sites/default/files/cs... https://www.nist.gov/sites/default/files/css/css_ykRiQh7fbub2hQuiIONx4rSV6sltctH8e4um76kZYCg.css?delta=0&language=en&theme=nist_www&include=eJxlj9EOwiAMRX-IyCc1BSrgCiXAwvx7mVOzxbd7TprbFtcugNkGqU3jCZRBu8DkLkWfMkQrWVmppF1dC_INH7hdhIvI4hVtnWNevvaDKsfWtWcxyO8MBT3BncjtW_S_OqZ6oETzAGGDFZI47WJDwwS_VhhjXJp3DpJor1Pt2Tql-UqjFx-_YAo — 200 — 5.6 KiB — 110 ms — h2https://www.nist.gov/sites/default/files/css/css_BEbKB4LxuujEPFpD1AfEAFFgDOp99SX9m78Q_0mHP8k.css?delta=1&language=en&theme=nist_www&include=eJxlj9EOwiAMRX-IyCc1BSrgCiXAwvx7mVOzxbd7TprbFtcugNkGqU3jCZRBu8DkLkWfMkQrWVmppF1dC_INH7hdhIvI4hVtnWNevvaDKsfWtWcxyO8MBT3BncjtW_S_OqZ6oETzAGGDFZI47WJDwwS_VhhjXJp3DpJor1Pt2Tql-UqjFx-_YAowww.nist.gov/sites/default/files/cs... https://www.nist.gov/sites/default/files/css/css_BEbKB4LxuujEPFpD1AfEAFFgDOp99SX9m78Q_0mHP8k.css?delta=1&language=en&theme=nist_www&include=eJxlj9EOwiAMRX-IyCc1BSrgCiXAwvx7mVOzxbd7TprbFtcugNkGqU3jCZRBu8DkLkWfMkQrWVmppF1dC_INH7hdhIvI4hVtnWNevvaDKsfWtWcxyO8MBT3BncjtW_S_OqZ6oETzAGGDFZI47WJDwwS_VhhjXJp3DpJor1Pt2Tql-UqjFx-_YAo — 200 — 75.9 KiB — 193 ms — h2https://www.nist.gov/sites/default/files/css/css_ssZ349pFYQBYitUuNabAF3FOqSxlTxQWBqUH5jL2wEI.css?delta=3&language=en&theme=nist_www&include=eJxlj9EOwiAMRX-IyCc1BSrgCiXAwvx7mVOzxbd7TprbFtcugNkGqU3jCZRBu8DkLkWfMkQrWVmppF1dC_INH7hdhIvI4hVtnWNevvaDKsfWtWcxyO8MBT3BncjtW_S_OqZ6oETzAGGDFZI47WJDwwS_VhhjXJp3DpJor1Pt2Tql-UqjFx-_YAowww.nist.gov/sites/default/files/cs... https://www.nist.gov/sites/default/files/css/css_ssZ349pFYQBYitUuNabAF3FOqSxlTxQWBqUH5jL2wEI.css?delta=3&language=en&theme=nist_www&include=eJxlj9EOwiAMRX-IyCc1BSrgCiXAwvx7mVOzxbd7TprbFtcugNkGqU3jCZRBu8DkLkWfMkQrWVmppF1dC_INH7hdhIvI4hVtnWNevvaDKsfWtWcxyO8MBT3BncjtW_S_OqZ6oETzAGGDFZI47WJDwwS_VhhjXJp3DpJor1Pt2Tql-UqjFx-_YAo — 200 — 8.2 KiB — 108 ms — h2https://www.nist.gov/sites/default/files/js/js_agndrownnWbPAxUFhN_wUh92DTsaknXJLh63K4qujWA.js?scope=header&delta=0&language=en&theme=nist_www&include=eJxljmEOgzAIhS_UyZEItVg7aTFtTT3-OnWJ2_4AHzzg0VYVKY2z5gJ0A2NpXLBz1RVuNT6L4b1KSAu4vK0kw4XGq3phrOTB9_DLAz1p_25Gk0Kp4EUtyaNfPnBmcpw_iFPoeqctiZLDmruXkPo2neOVPOPE7N4m4b91qurMsX9VFUsZozpwoZDtlw_rh6a1drPS2E6aI1x5cIFE_QuuxnZ3www.nist.gov/sites/default/files/js... https://www.nist.gov/sites/default/files/js/js_agndrownnWbPAxUFhN_wUh92DTsaknXJLh63K4qujWA.js?scope=header&delta=0&language=en&theme=nist_www&include=eJxljmEOgzAIhS_UyZEItVg7aTFtTT3-OnWJ2_4AHzzg0VYVKY2z5gJ0A2NpXLBz1RVuNT6L4b1KSAu4vK0kw4XGq3phrOTB9_DLAz1p_25Gk0Kp4EUtyaNfPnBmcpw_iFPoeqctiZLDmruXkPo2neOVPOPE7N4m4b91qurMsX9VFUsZozpwoZDtlw_rh6a1drPS2E6aI1x5cIFE_QuuxnZ3 — 200 — 409 B — 189 ms — h2https://www.nist.gov/modules/contrib/google_tag/js/gtag.js?tdl75hwww.nist.gov/modules/contrib/google... https://www.nist.gov/modules/contrib/google_tag/js/gtag.js?tdl75h — 200 — 813 B — 190 ms — h2https://www.nist.gov/modules/contrib/google_tag/js/gtm.js?tdl75hwww.nist.gov/modules/contrib/google... https://www.nist.gov/modules/contrib/google_tag/js/gtm.js?tdl75h — 200 — 638 B — 191 ms — h2https://www.nist.gov/sites/default/files/js/js_5WbAeKWaHF5M7ZGOm0J4MoiuVLINg4UjWTVpVV4wxTc.js?scope=header&delta=3&language=en&theme=nist_www&include=eJxljmEOgzAIhS_UyZEItVg7aTFtTT3-OnWJ2_4AHzzg0VYVKY2z5gJ0A2NpXLBz1RVuNT6L4b1KSAu4vK0kw4XGq3phrOTB9_DLAz1p_25Gk0Kp4EUtyaNfPnBmcpw_iFPoeqctiZLDmruXkPo2neOVPOPE7N4m4b91qurMsX9VFUsZozpwoZDtlw_rh6a1drPS2E6aI1x5cIFE_QuuxnZ3www.nist.gov/sites/default/files/js... https://www.nist.gov/sites/default/files/js/js_5WbAeKWaHF5M7ZGOm0J4MoiuVLINg4UjWTVpVV4wxTc.js?scope=header&delta=3&language=en&theme=nist_www&include=eJxljmEOgzAIhS_UyZEItVg7aTFtTT3-OnWJ2_4AHzzg0VYVKY2z5gJ0A2NpXLBz1RVuNT6L4b1KSAu4vK0kw4XGq3phrOTB9_DLAz1p_25Gk0Kp4EUtyaNfPnBmcpw_iFPoeqctiZLDmruXkPo2neOVPOPE7N4m4b91qurMsX9VFUsZozpwoZDtlw_rh6a1drPS2E6aI1x5cIFE_QuuxnZ3 — 200 — 431 B — 191 ms — 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— 8 ms — h2https://www.nist.gov/cdn-cgi/rum?www.nist.gov/cdn-cgi/rum? https://www.nist.gov/cdn-cgi/rum? — 204 — 170 B — 99 ms — h2https://www.nist.gov/themes/custom/nist_www/favicon.icowww.nist.gov/themes/custom/nist_www... https://www.nist.gov/themes/custom/nist_www/favicon.ico — 200 — 2.2 KiB — 106 ms — h2https://bam.nr-data.net/1/37b7ccb661?a=1089704227&v=1.312.1&to=YFxUN0sADEdYVkBaClkWdwBNCA1aFkVVVABoWlcAUQQ%3D&rst=3094&ck=0&s=f42ab76417b643e2&ref=https://www.nist.gov/&ptid=66fde9003a9cc2a2&qt=9&ap=30&be=498&fe=2575&dc=475&at=TBtDQQMaHxgbVBYJHkpE&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776359729382,%22n%22:0,%22f%22:386,%22dn%22:386,%22dne%22:386,%22c%22:386,%22s%22:386,%22ce%22:386,%22rq%22:388,%22rp%22:498,%22rpe%22:508,%22di%22:946,%22ds%22:951,%22de%22:973,%22dc%22:3070,%22l%22:3070,%22le%22:3073%7D,%22navigation%22:%7B%7D%7D&fp=864&fcp=864bam.nr-data.net/1/37b7ccb661?a=1089... https://bam.nr-data.net/1/37b7ccb661?a=1089704227&v=1.312.1&to=YFxUN0sADEdYVkBaClkWdwBNCA1aFkVVVABoWlcAUQQ%3D&rst=3094&ck=0&s=f42ab76417b643e2&ref=https://www.nist.gov/&ptid=66fde9003a9cc2a2&qt=9&ap=30&be=498&fe=2575&dc=475&at=TBtDQQMaHxgbVBYJHkpE&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776359729382,%22n%22:0,%22f%22:386,%22dn%22:386,%22dne%22:386,%22c%22:386,%22s%22:386,%22ce%22:386,%22rq%22:388,%22rp%22:498,%22rpe%22:508,%22di%22:946,%22ds%22:951,%22de%22:973,%22dc%22:3070,%22l%22:3070,%22le%22:3073%7D,%22navigation%22:%7B%7D%7D&fp=864&fcp=864 — 200 — 727 B — 519 ms — http/1.1https://bam.nr-data.net/events/1/37b7ccb661?a=1089704227&v=1.312.1&to=YFxUN0sADEdYVkBaClkWdwBNCA1aFkVVVABoWlcAUQQ%3D&rst=3621&ck=0&s=f42ab76417b643e2&ref=https://www.nist.gov/&ptid=66fde9003a9cc2a2bam.nr-data.net/events/1/37b7ccb661... https://bam.nr-data.net/events/1/37b7ccb661?a=1089704227&v=1.312.1&to=YFxUN0sADEdYVkBaClkWdwBNCA1aFkVVVABoWlcAUQQ%3D&rst=3621&ck=0&s=f42ab76417b643e2&ref=https://www.nist.gov/&ptid=66fde9003a9cc2a2 — 200 — 365 B — 377 ms — http/1.1https://customer-ltx6ylk10sje63q6.cloudflarestream.com/84921ef26d48015ab5328c0fcb8c49b7/video/1080/seg_9.mp4?p=eyJ0eXBlIjoic2VnbWVudCIsInZpZGVvSUQiOiI4NDkyMWVmMjZkNDgwMTVhYjUzMjhjMGZjYjhjNDliNyIsIm93bmVySUQiOjYyNjEwMTU1LCJjcmVhdG9ySUQiOiIiLCJzZWdtZW50RHVyYXRpb25TZWNzIjo0LjAwNCwic3RvcmFnZVByb3ZpZGVyIjo0LCJ0cmFjayI6ImI4NDk2MzQyMTcyNWM0MGExZWIxMDVhZDAwNzMzOGJlIiwicmVuZGl0aW9uIjoiMTQ5OTIwNjQ2NCIsIm11eGluZyI6IjE1NTkwMzY3MjYifQ&s=w4zDmEIDKnMEw681C8KvXsO3TsKcwprDqlYfEMOgTsO0woRBecKKLwsReCIcustomer-ltx6ylk10sje63q6.cloudflar... https://customer-ltx6ylk10sje63q6.cloudflarestream.com/84921ef26d48015ab5328c0fcb8c49b7/video/1080/seg_9.mp4?p=eyJ0eXBlIjoic2VnbWVudCIsInZpZGVvSUQiOiI4NDkyMWVmMjZkNDgwMTVhYjUzMjhjMGZjYjhjNDliNyIsIm93bmVySUQiOjYyNjEwMTU1LCJjcmVhdG9ySUQiOiIiLCJzZWdtZW50RHVyYXRpb25TZWNzIjo0LjAwNCwic3RvcmFnZVByb3ZpZGVyIjo0LCJ0cmFjayI6ImI4NDk2MzQyMTcyNWM0MGExZWIxMDVhZDAwNzMzOGJlIiwicmVuZGl0aW9uIjoiMTQ5OTIwNjQ2NCIsIm11eGluZyI6IjE1NTkwMzY3MjYifQ&s=w4zDmEIDKnMEw681C8KvXsO3TsKcwprDqlYfEMOgTsO0woRBecKKLwsReCI — 200 — 2.3 MiB — 88 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 799ms · 429KB · €9/mo
www.nist.gov
Other
Costly
Execution 348ms
Transfer 26 KB
Monthly Cost €4/mo
Unattributable
Other
Optional
Execution 195ms
Transfer 0 KB
Monthly Cost €2/mo
www.nist.gov
Other
Optional
Execution 70ms
Transfer 0 KB
Monthly Cost €1/mo
www.nist.gov
Other
Optional
Execution 63ms
Transfer 99 KB
Unused 67%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 156 KB
Unused 42%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 147 KB
Unused 43%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.nist.gov adds 348ms and costs ~€4/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

www.nist.gov takes 348ms 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

67% of www.nist.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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