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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
90
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.

1.04 s

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

1.87 s

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

56 ms

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

0.019

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

1.04 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.

2.84 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 4 REVIEW 3 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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
17 scripts, 412 KB unused
FIX
17 scripts, 412 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-D36B...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KG7...: 62 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HFDN...: 61 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 412 KB
412 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147 KB106 KB (72%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-D36B6EXMET&cx=c&gtm=4e64h1156 KB64 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB63 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KG7PVKB134 KB62 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HFDNVE0DSC&cx=c&gtm=4e64h1153 KB61 KB (40%)✓3rd
https://www.nlr.gov/ResourcePackages/Frontend/public/library/js/main.js?v=63912320702000000041 KB28 KB (75%)✗3rd
https://platform-api.sharethis.com/js/sharethis.js47 KB27 KB (58%)✗3rd
https://buttons-config.sharethis.com/js/64bee650c73e910012491844.js1 KB—✓3rd
https://www.nlr.gov/WebResource.axd?d=HtQyXelCu6mzSPcVcvK_BjykPDToej-LFGyQsm-N8BbLjg4wqt3TLM6utk15Ex8EbS0bUgTJRZ_3vHQ60kzHEseebs5B7RNbkWk9fQSC_3-Mb4YXAUtSZNZ13O2u6paKG_Ff4UoMNNKRdD-Osbk5FG8WPycT7wA79QOiS6sMmMO3ogxM7wS0D7jDR6MtTzMW5w1aqTpEzWn8DypUeJ3d6WXHnMQKLDOXOht83U0YmkM1&t=6388757253400000005 KB—✓3rd
https://cdn.insight.sitefinity.com/sdk/sitefinity-insight-client.min.3.1.44.js11 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
57 resources · 1.8 MB · 412 KB savings available
FIX
57 resources · 1.8 MB · 412 KB savings available
Warning::
Page weight 800 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~412 KB of savings available
Warning::
56 third-party resources (100% of weight)
57 resources · 1.8 MiB · 56 third-party 800.2 KiB over 1MB target
JavaScript 50% · 906.0 KiB
Image 29% · 530.6 KiB
CSS 11% · 194.5 KiB
Font 9% · 171.3 KiB
Document 1% · 14.2 KiB
Other 0% · 7.5 KiB

~411.7 KiB of savings available

Remove unused JavaScript: 411.7 KiB
C
Page Weight Budget
Action
1.8 MB transferred, 57 requests
REVIEW
1.8 MB transferred, 57 requests
Info::
Page weighs 5.1 MB (1.8 MB transferred)
Warning::
JavaScript is 906 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 906 KB
Info::
57 HTTP requests
Info::
Estimated 0.37 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
57 requests
0.37 g CO2 per page load
JavaScript 906.0 KiB 50%
Images 512.8 KiB 28%
Fonts 171.3 KiB 9%
CSS 100.6 KiB 6%
Other 94.5 KiB 5%
Other 20.8 KiB 1%
HTML 12.4 KiB 1%
Other 3.3 KiB 0%
Other 2.3 KiB 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

C
Image Optimization
Action
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://www.nlr.gov/images/libraries/global/hp-dat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nlr.gov/ResourcePackages/Frontend/publ... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nlr.gov/images/libraries/global/allian... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nlr.gov/images/libraries/global/hp-fin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nlr.gov/images/libraries/global/hp-ene... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 513 KB
0 oversized -0 KB
6 legacy format
5 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

B
JS Execution Cost
779ms total JS execution
REVIEW
779ms total JS execution
Info::
https://www.nlr.gov/: 194ms CPU time
Info::
Unattributable: 152ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-HFDN...: 100ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 93ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 85ms CPU time
Warning::
Third-party scripts: 779ms (100% of total)

Main Thread Breakdown

Script Evaluation 52% Style & Layout 18% Other 16% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.nlr.gov/194ms2ms0ms3rd
Unattributable152ms6ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HFDNVE0DSC&cx=c&gtm=4e64h1100ms82ms17ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js93ms80ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L85ms71ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-D36B6EXMET&cx=c&gtm=4e64h180ms64ms16ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KG7PVKB75ms59ms13ms3rd
B
HTTP Caching
public, max-age=0, s-maxage=7200
REVIEW
public, max-age=0, s-maxage=7200
Info::
Cache-Control header is set
Got: public, max-age=0, s-maxage=7200
Info::
CDN TTL: 2 hours (s-maxage=7200)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, s-maxage=7200

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
s-maxage7200CDN caches for 2 hours
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
8 fonts (171 KB)
PASS
8 fonts (171 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

171 KB total

Render-blocking

0

of 8

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 1.0 s LCP 1.9 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 9 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFOKCnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmOClHrs6ljXfMMLoHQuAj-k3Yi128m0g.woff2KFOKCnqEu92Fr1Mu53ZEC9_... https://fonts.gstatic.com/s/roboto/v51/KFOKCnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmOClHrs6ljXfMMLoHQuAj-k3Yi128m0g.woff2 — 17.8 KiB — 7 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-22.woff2pro-fa-regular-400-22.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-22.woff2 — 19.8 KiB — 32 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2pro-fa-brands-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2 — 36.9 KiB — 34 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-13.woff2pro-fa-solid-900-13.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-13.woff2 — 13.5 KiB — 28 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-1.woff2pro-fa-solid-900-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-1.woff2 — 13.8 KiB — 29 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-12.woff2pro-fa-solid-900-12.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-12.woff2 — 16.1 KiB — 36 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-1.woff2pro-fa-regular-400-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-1.woff2 — 16.7 KiB — 26 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 9 ms
Start 801 ms
Risk FOUT — text flashes from fallback to web font
KFOKCnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 18 KB
Load time 7 ms
Start 802 ms
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-22.w... woff2 swap
Size 20 KB
Load time 32 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2 woff2 swap
Size 37 KB
Load time 34 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-13.woff2 woff2 swap
Size 13 KB
Load time 28 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-1.woff2 woff2 swap
Size 14 KB
Load time 29 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-12.woff2 woff2 swap
Size 16 KB
Load time 36 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-1.woff2 woff2 swap
Size 17 KB
Load time 26 ms
Start 1.1 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
57 requests over 2040ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 1.9 shttps://nrel.gov// https://nrel.gov/ — 301 — 215 B — 469 ms — h2https://www.nlr.gov/www.nlr.gov/ https://www.nlr.gov/ — 200 — 12.4 KiB — 94 ms — h2https://www.nlr.gov/ResourcePackages/FrontEnd/public/library/css/gov/styles-gov.css?v=639123207000000000www.nlr.gov/ResourcePackages/FrontE... https://www.nlr.gov/ResourcePackages/FrontEnd/public/library/css/gov/styles-gov.css?v=639123207000000000 — 200 — 98.2 KiB — 51 ms — h2https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;0,700;1,400&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;0,700;1,400&display=swap — 200 — 2.4 KiB — 121 ms — h2https://www.nlr.gov/WebResource.axd?d=HtQyXelCu6mzSPcVcvK_BjykPDToej-LFGyQsm-N8BbLjg4wqt3TLM6utk15Ex8EbS0bUgTJRZ_3vHQ60kzHEseebs5B7RNbkWk9fQSC_3-Mb4YXAUtSZNZ13O2u6paKG_Ff4UoMNNKRdD-Osbk5FG8WPycT7wA79QOiS6sMmMO3ogxM7wS0D7jDR6MtTzMW5w1aqTpEzWn8DypUeJ3d6WXHnMQKLDOXOht83U0YmkM1&t=638875725340000000www.nlr.gov/WebResource.axd?d=HtQyX... https://www.nlr.gov/WebResource.axd?d=HtQyXelCu6mzSPcVcvK_BjykPDToej-LFGyQsm-N8BbLjg4wqt3TLM6utk15Ex8EbS0bUgTJRZ_3vHQ60kzHEseebs5B7RNbkWk9fQSC_3-Mb4YXAUtSZNZ13O2u6paKG_Ff4UoMNNKRdD-Osbk5FG8WPycT7wA79QOiS6sMmMO3ogxM7wS0D7jDR6MtTzMW5w1aqTpEzWn8DypUeJ3d6WXHnMQKLDOXOht83U0YmkM1&t=638875725340000000 — 200 — 5.1 KiB — 39 ms — h2https://www.nlr.gov/images/libraries/global/nlr-logo-horizontal.svg?sfvrsn=3f07526e_2www.nlr.gov/images/libraries/global... https://www.nlr.gov/images/libraries/global/nlr-logo-horizontal.svg?sfvrsn=3f07526e_2 — 200 — 7.3 KiB — 51 ms — h2https://www.nlr.gov/images/libraries/news/20260415-hp-the-fast-lane-3-ways-to-get-more-critical-minerals-now-095141.webp?sfvrsn=7f348e8c_2www.nlr.gov/images/libraries/news/2... https://www.nlr.gov/images/libraries/news/20260415-hp-the-fast-lane-3-ways-to-get-more-critical-minerals-now-095141.webp?sfvrsn=7f348e8c_2 — 200 — 157.1 KiB — 49 ms — h2https://www.nlr.gov/images/libraries/global/hp-data-tools-67850.webp?sfvrsn=3560e9a9_2www.nlr.gov/images/libraries/global... https://www.nlr.gov/images/libraries/global/hp-data-tools-67850.webp?sfvrsn=3560e9a9_2 — 200 — 101.6 KiB — 104 ms — h3https://www.nlr.gov/images/libraries/global/hp-find-a-job-96020.webp?sfvrsn=aa34f77f_2www.nlr.gov/images/libraries/global... https://www.nlr.gov/images/libraries/global/hp-find-a-job-96020.webp?sfvrsn=aa34f77f_2 — 200 — 55.9 KiB — 106 ms — h3https://www.nlr.gov/images/libraries/global/hp-energy-basics-93442.webp?sfvrsn=38561846_2www.nlr.gov/images/libraries/global... https://www.nlr.gov/images/libraries/global/hp-energy-basics-93442.webp?sfvrsn=38561846_2 — 200 — 26.3 KiB — 48 ms — h3https://www.nlr.gov/ResourcePackages/Frontend/public/library/js/vendor/glide.min.js?package=govwww.nlr.gov/ResourcePackages/Fronte... https://www.nlr.gov/ResourcePackages/Frontend/public/library/js/vendor/glide.min.js?package=gov — 200 — 10.7 KiB — 56 ms — h3https://www.nlr.gov/ResourcePackages/Frontend/public/library/js/main.js?v=639123207020000000www.nlr.gov/ResourcePackages/Fronte... https://www.nlr.gov/ResourcePackages/Frontend/public/library/js/main.js?v=639123207020000000 — 200 — 40.9 KiB — 59 ms — h3https://kit.fontawesome.com/a5d615d1e4.jskit.fontawesome.com/a5d615d1e4.js https://kit.fontawesome.com/a5d615d1e4.js — 200 — 5.7 KiB — 65 ms — 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h2https://www.googletagmanager.com/gtag/js?id=G-HFDNVE0DSC&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-HFDNVE0DSC&cx=c&gtm=4e64h1 — 200 — 153.1 KiB — 200 ms — h2https://www.clarity.ms/tag/jqyludgwnn?ref=gtm2www.clarity.ms/tag/jqyludgwnn?ref=g... https://www.clarity.ms/tag/jqyludgwnn?ref=gtm2 — 200 — 1.5 KiB — 20 ms — http/1.1https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NRELdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=NREL — 200 — 9.4 KiB — 26 ms — h2https://www.nlr.gov/ResourcePackages/Frontend/public/library/img/favicons/gov/favicon.ico?v=639123207020000000www.nlr.gov/ResourcePackages/Fronte... https://www.nlr.gov/ResourcePackages/Frontend/public/library/img/favicons/gov/favicon.ico?v=639123207020000000 — 200 — 5.6 KiB — 52 ms — h3https://scripts.clarity.ms/0.8.59/clarity.jsscripts.clarity.ms/0.8.59/clarity.j... https://scripts.clarity.ms/0.8.59/clarity.js — 200 — 26.2 KiB — 30 ms — h2https://c.clarity.ms/c.gifc.clarity.ms/c.gif https://c.clarity.ms/c.gif — 302 — 519 B — 138 ms — h2https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.jsdap.digitalgov.gov/web-vitals/dist/... https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js — 200 — 4.6 KiB — 10 ms — h2https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4Lwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L — 200 — 147.2 KiB — 209 ms — h2https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1 — 200 — 147.2 KiB — 192 ms — h2https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=6D1A959ACD7942BE87F0A12EE42B6CCF&RedC=c.clarity.ms&MXFR=3C98BD11DB7B62192F54AA53DF7B6CA4c.bing.com/c.gif?ctsa=mr&CtsSyncId=... https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=6D1A959ACD7942BE87F0A12EE42B6CCF&RedC=c.clarity.ms&MXFR=3C98BD11DB7B62192F54AA53DF7B6CA4 — 302 — 763 B — 147 ms — h2https://b.clarity.ms/collectb.clarity.ms/collect https://b.clarity.ms/collect — 204 — 275 B — 694 ms — http/1.1https://api.insight.sitefinity.com/collect/v2/data-centers/74c681a2-d5d5-4324-6948-4033ccf1b7a6/datasources/Website/interactionsapi.insight.sitefinity.com/collect/... https://api.insight.sitefinity.com/collect/v2/data-centers/74c681a2-d5d5-4324-6948-4033ccf1b7a6/datasources/Website/interactions — 200 — 1.1 KiB — 137 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-HFDNVE0DSC&gtm=45je64h1v872782384z879288587za20gzb79288587zd79288587&_p=1776814679171&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=156060442.1776814680&frm=0&pscdl=noapi&rcb=3&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266401~117512542~118463262&sid=1776814680&sct=1&seg=0&dl=https%3A%2F%2Fwww.nlr.gov%2F&dt=Home%20%7C%20NLR&en=page_view&_fv=1&_nsi=1&_ss=1&up.nrel_staff=false&tfd=1448www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-HFDNVE0DSC&gtm=45je64h1v872782384z879288587za20gzb79288587zd79288587&_p=1776814679171&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=156060442.1776814680&frm=0&pscdl=noapi&rcb=3&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266401~117512542~118463262&sid=1776814680&sct=1&seg=0&dl=https%3A%2F%2Fwww.nlr.gov%2F&dt=Home%20%7C%20NLR&en=page_view&_fv=1&_nsi=1&_ss=1&up.nrel_staff=false&tfd=1448 — 204 — 547 B — 184 ms — h2https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=6D1A959ACD7942BE87F0A12EE42B6CCF&MUID=3F481B42CB9562801F130C00CA486359c.clarity.ms/c.gif?ctsa=mr&CtsSyncI... https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=6D1A959ACD7942BE87F0A12EE42B6CCF&MUID=3F481B42CB9562801F130C00CA486359 — 200 — 466 B — 122 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-D36B6EXMET&gtm=45je64h1v885835086z879288587za20gzb79288587zd79288587&_p=1776814679171&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=156060442.1776814680&frm=0&pscdl=noapi&rcb=7&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266400~117512542&sid=1776814680&sct=1&seg=0&dl=https%3A%2F%2Fwww.nlr.gov%2F&dt=Home%20%7C%20NLR&en=page_view&_fv=1&_ss=1&ep.debug_mode=true&tfd=1536www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-D36B6EXMET&gtm=45je64h1v885835086z879288587za20gzb79288587zd79288587&_p=1776814679171&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=156060442.1776814680&frm=0&pscdl=noapi&rcb=7&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266400~117512542&sid=1776814680&sct=1&seg=0&dl=https%3A%2F%2Fwww.nlr.gov%2F&dt=Home%20%7C%20NLR&en=page_view&_fv=1&_ss=1&ep.debug_mode=true&tfd=1536 — 204 — 48 B — 99 ms — h2https://l.sharethis.com/sc?event=pview&hostname=www.nlr.gov&location=%2F&product=inline-share-buttons&url=https%3A%2F%2Fwww.nlr.gov%2F&source=platform&fcmp=false&fcmpv2=false&has_segmentio=false&title=Home%20%7C%20NLR&cms=unknown&publisher=64bee650c73e910012491844&sop=true&version=st_sop.js&lang=en&description=NLR%20bridges%20research%20with%20real-world%20applications%20to%20advance%20energy%20technologies%20that%20lower%20costs%2C%20boost%20the%20economy%2C%20strengthen%20security%2C%20and%20ensure%20abundant%20energy.&ua=%22Chromium%22%3Bv%3D%22146%22%2C%20%22Google%20Chrome%22%3Bv%3D%22146%22&ua_mobile=false&ua_platform=macOS&ua_full_version_list=%22Not-A.Brand%22%3Bv%3D%2224.0.0.0%22%2C%20%22Chromium%22%3Bv%3D%22146.0.7680.164%22&ua_platform_version=10.15.7&uuid=1f8e99c7-7280-461b-b9c2-28391dc9e4f2&samesite=Nonel.sharethis.com/sc?event=pview&host... https://l.sharethis.com/sc?event=pview&hostname=www.nlr.gov&location=%2F&product=inline-share-buttons&url=https%3A%2F%2Fwww.nlr.gov%2F&source=platform&fcmp=false&fcmpv2=false&has_segmentio=false&title=Home%20%7C%20NLR&cms=unknown&publisher=64bee650c73e910012491844&sop=true&version=st_sop.js&lang=en&description=NLR%20bridges%20research%20with%20real-world%20applications%20to%20advance%20energy%20technologies%20that%20lower%20costs%2C%20boost%20the%20economy%2C%20strengthen%20security%2C%20and%20ensure%20abundant%20energy.&ua=%22Chromium%22%3Bv%3D%22146%22%2C%20%22Google%20Chrome%22%3Bv%3D%22146%22&ua_mobile=false&ua_platform=macOS&ua_full_version_list=%22Not-A.Brand%22%3Bv%3D%2224.0.0.0%22%2C%20%22Chromium%22%3Bv%3D%22146.0.7680.164%22&ua_platform_version=10.15.7&uuid=1f8e99c7-7280-461b-b9c2-28391dc9e4f2&samesite=None — 200 — 946 B — 138 ms — http/1.1https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb79288587zd79288587&_p=1776814679171&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=156060442.1776814680&frm=0&pscdl=noapi&rcb=11&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512542&dl=https%3A%2F%2Fnlr.gov%2F&dt=Home%20%7C%20NLR&dr=&sid=1776814680&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=NREL&ep.subagency=NLR.GOV&ep.site_topic=unspecified%3Anlr.gov&ep.site_platform=unspecified%3Anlr.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=nlr.gov&tfd=1619www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb79288587zd79288587&_p=1776814679171&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=156060442.1776814680&frm=0&pscdl=noapi&rcb=11&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512542&dl=https%3A%2F%2Fnlr.gov%2F&dt=Home%20%7C%20NLR&dr=&sid=1776814680&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=NREL&ep.subagency=NLR.GOV&ep.site_topic=unspecified%3Anlr.gov&ep.site_platform=unspecified%3Anlr.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=nlr.gov&tfd=1619 — 204 — 48 B — 65 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 779ms · 630KB · $10/mo
www.nlr.gov
Other
Optional
Execution 194ms
Transfer 12 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 152ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 100ms
Transfer 153 KB
Unused 40%
Monthly Cost $1/mo
Microsoft Clarity
Session Replay
Optional
Execution 93ms
Transfer 26 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 147 KB
Unused 43%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 80ms
Transfer 156 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 75ms
Transfer 134 KB
Unused 46%
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

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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