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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.

2.36 s

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

3.16 s

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

298 ms

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

0.001

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

4.68 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.

13.84 s

Page Load Progression

638 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.8 s
4.5 s
5.1 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
6.5 MB transferred, 91 requests
FIX
6.5 MB transferred, 91 requests
Critical::
Page weighs 9.1 MB (6.5 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::
91 HTTP requests
Info::
Estimated 1.4 g CO2 per page load
6.5 MB / 2.4 MB budget
6.5 MB transferred
91 requests
1.4 g CO2 per page load
Other 4.6 MiB 70%
JavaScript 1011.5 KiB 15%
Images 768.3 KiB 11%
CSS 92.6 KiB 1%
Fonts 76.6 KiB 1%
Other 30.7 KiB 0%
HTML 28.6 KiB 0%
Other 3.3 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 (6.5 MiB of 6.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2765ms total JS execution
FIX
2765ms total JS execution
Warning::
https://www.nist.gov/: 1088ms CPU time
Warning::
Unattributable: 585ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HEQ0...: 241ms CPU time
Info::
https://www.nist.gov/cdn-cgi/challenge-platform/sc...: 217ms CPU time
Info::
https://www.nist.gov/sites/default/files/js/js_2I-...: 174ms CPU time
Warning::
Third-party scripts: 2765ms (100% of total)

Main Thread Breakdown

Script Evaluation 34% Other 33% Style & Layout 17% Rendering 7% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.nist.gov/1088ms56ms8ms3rd
Unattributable585ms92ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HEQ0YF2VYL&cx=c&gtm=4e64f0241ms192ms38ms3rd
https://www.nist.gov/cdn-cgi/challenge-platform/scripts/jsd/main.js217ms203ms4ms3rd
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_QuuxnZ3174ms105ms25ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f0161ms99ms55ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-54VSXXDF143ms117ms24ms3rd
https://js-agent.newrelic.com/nr-rum-1.312.1.min.js81ms64ms6ms3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451675ms22ms3ms3rd
D
Page Weight Inventory
Action
91 resources · 6.5 MB · 260 KB savings available
FIX
91 resources · 6.5 MB · 260 KB savings available
Warning::
Page weight 5.5 MB over 1MB target
Got: 6.5 MB Expected: ≤ 1 MB
Info::
~260 KB of savings available
Warning::
90 third-party resources (100% of weight)
Info::
10 resources over 200KB
91 resources · 6.5 MiB · 90 third-party 5.5 MiB over 1MB target
Media 70% · 4.6 MiB
JavaScript 15% · 1011.5 KiB
Image 12% · 798.8 KiB
CSS 1% · 92.6 KiB
Font 1% · 76.6 KiB
Document 0% · 28.6 KiB
Other 0% · 6.2 KiB

~259.8 KiB of savings available

Remove unused JavaScript: 259.8 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.

B
Image Optimization
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Info::
All images are well-optimized
35 images 768 KB
0 oversized -0 KB
33 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
16 scripts, 260 KB unused
REVIEW
16 scripts, 260 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HEQ0...: 68 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
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/gtm.js?id=GTM-54V...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 260 KB
260 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-HEQ0YF2VYL&cx=c&gtm=4e64f0156 KB68 KB (43%)✓3rd
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/gtm.js?id=GTM-54VSXXDF117 KB63 KB (54%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64f0147 KB62 KB (42%)✓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
4 fonts (77 KB)
PASS
4 fonts (77 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

77 KB total

Render-blocking

0

of 4

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 FCP 2.4 s LCP 3.2 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 — 20.2 KiB — 129 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 — 122 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 — 142 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 — 135 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 129 ms
Start 798 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 122 ms
Start 798 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-semibold-... woff2 swap
Size 20 KB
Load time 142 ms
Start 799 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bolditali... woff2 swap
Size 16 KB
Load time 135 ms
Start 799 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
1
preload
—
dns-prefetch
—
prefetch
—

1 resource hints configured

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
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
91 requests over 4262ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.4 s LCP 3.2 shttps://nist.gov// https://nist.gov/ — 301 — 93 B — 390 ms — h2https://www.nist.gov/www.nist.gov/ https://www.nist.gov/ — 200 — 26.3 KiB — 129 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 — 196 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 — 8.1 KiB — 192 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 — 194 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 — 836 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 — 643 B — 193 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 — 195 ms — 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https://customer-ltx6ylk10sje63q6.cloudflarestream.com/84921ef26d48015ab5328c0fcb8c49b7/video/480/seg_8.mp4?p=eyJ0eXBlIjoic2VnbWVudCIsInZpZGVvSUQiOiI4NDkyMWVmMjZkNDgwMTVhYjUzMjhjMGZjYjhjNDliNyIsIm93bmVySUQiOjYyNjEwMTU1LCJjcmVhdG9ySUQiOiIiLCJzZWdtZW50RHVyYXRpb25TZWNzIjo0LjAwNCwic3RvcmFnZVByb3ZpZGVyIjo0LCJ0cmFjayI6ImI4NDk2MzQyMTcyNWM0MGExZWIxMDVhZDAwNzMzOGJlIiwicmVuZGl0aW9uIjoiMTQ5OTIwNjQxMCIsIm11eGluZyI6IjE1NTkwMzY2NzIifQ&s=wrjCmxV5w7vCiwbDvMKTwocVw5bDgkF5wpLDlUBtQcODNEUTwp3DpVx3TR0YVA — 200 — 656.9 KiB — 327 ms — h2https://bam.nr-data.net/events/1/37b7ccb661?a=1089704227&v=1.312.1&to=YFxUN0sADEdYVkBaClkWdwBNCA1aFkVVVABoWlcAUQQ%3D&rst=3565&ck=0&s=2ff53ee3212a757b&ref=https://www.nist.gov/&ptid=f685d5d81a409b4fbam.nr-data.net/events/1/37b7ccb661... https://bam.nr-data.net/events/1/37b7ccb661?a=1089704227&v=1.312.1&to=YFxUN0sADEdYVkBaClkWdwBNCA1aFkVVVABoWlcAUQQ%3D&rst=3565&ck=0&s=2ff53ee3212a757b&ref=https://www.nist.gov/&ptid=f685d5d81a409b4f — 200 — 365 B — 542 ms — http/1.1https://customer-ltx6ylk10sje63q6.cloudflarestream.com/84921ef26d48015ab5328c0fcb8c49b7/video/480/seg_9.mp4?p=eyJ0eXBlIjoic2VnbWVudCIsInZpZGVvSUQiOiI4NDkyMWVmMjZkNDgwMTVhYjUzMjhjMGZjYjhjNDliNyIsIm93bmVySUQiOjYyNjEwMTU1LCJjcmVhdG9ySUQiOiIiLCJzZWdtZW50RHVyYXRpb25TZWNzIjo0LjAwNCwic3RvcmFnZVByb3ZpZGVyIjo0LCJ0cmFjayI6ImI4NDk2MzQyMTcyNWM0MGExZWIxMDVhZDAwNzMzOGJlIiwicmVuZGl0aW9uIjoiMTQ5OTIwNjQxMCIsIm11eGluZyI6IjE1NTkwMzY2NzIifQ&s=wrjCmxV5w7vCiwbDvMKTwocVw5bDgkF5wpLDlUBtQcODNEUTwp3DpVx3TR0YVAcustomer-ltx6ylk10sje63q6.cloudflar... https://customer-ltx6ylk10sje63q6.cloudflarestream.com/84921ef26d48015ab5328c0fcb8c49b7/video/480/seg_9.mp4?p=eyJ0eXBlIjoic2VnbWVudCIsInZpZGVvSUQiOiI4NDkyMWVmMjZkNDgwMTVhYjUzMjhjMGZjYjhjNDliNyIsIm93bmVySUQiOjYyNjEwMTU1LCJjcmVhdG9ySUQiOiIiLCJzZWdtZW50RHVyYXRpb25TZWNzIjo0LjAwNCwic3RvcmFnZVByb3ZpZGVyIjo0LCJ0cmFjayI6ImI4NDk2MzQyMTcyNWM0MGExZWIxMDVhZDAwNzMzOGJlIiwicmVuZGl0aW9uIjoiMTQ5OTIwNjQxMCIsIm11eGluZyI6IjE1NTkwMzY2NzIifQ&s=wrjCmxV5w7vCiwbDvMKTwocVw5bDgkF5wpLDlUBtQcODNEUTwp3DpVx3TR0YVA — 200 — 604.4 KiB — 301 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 2765ms · 576KB · €30/mo
www.nist.gov
Other
Costly
Execution 1088ms
Transfer 26 KB
Monthly Cost €12/mo
Unattributable
Other
Costly
Execution 585ms
Transfer 0 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 241ms
Transfer 156 KB
Unused 43%
Monthly Cost €3/mo
www.nist.gov
Other
Costly
Execution 217ms
Transfer 0 KB
Monthly Cost €2/mo
www.nist.gov
Other
Optional
Execution 174ms
Transfer 99 KB
Unused 67%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 161ms
Transfer 147 KB
Unused 42%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 143ms
Transfer 117 KB
Unused 54%
Monthly Cost €2/mo
js-agent.newrelic.com
Other
Optional
Execution 81ms
Transfer 18 KB
Monthly Cost €1/mo
static.cloudflareinsights.com
Other
Optional
Execution 75ms
Transfer 11 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.nist.gov adds 1088ms and costs ~€12/month
  • Unattributable adds 585ms and costs ~€6/month
  • Google Tag Manager adds 241ms and costs ~€3/month
  • www.nist.gov adds 217ms and costs ~€2/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 1088ms 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

Unattributable takes 585ms 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

Google Tag Manager takes 241ms 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.nist.gov takes 217ms 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

54% of Google Tag Manager'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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