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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
31
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
75
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.

2.34 s

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

8.67 s

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

736 ms

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

0.323

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

7.30 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.

13.07 s

Page Load Progression

548 ms
1.1 s
1.6 s
2.2 s
2.7 s
3.3 s
3.8 s
4.4 s
Checks
17
8 PASS 3 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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3027ms total JS execution
FIX
3027ms total JS execution
Warning::
https://www.nsc.org/: 836ms CPU time
Warning::
Unattributable: 507ms CPU time
Warning::
https://www.nsc.org/Content/generated/nsc.bundle.f...: 360ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T4S...: 329ms CPU time
Warning::
https://www.googletagmanager.com/gtag/destination?...: 299ms CPU time
Warning::
Third-party scripts: 3027ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 18% Style & Layout 12% Script Parsing & Compilation 7% Parse HTML & CSS 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.nsc.org/836ms229ms4ms3rd
Unattributable507ms118ms0ms3rd
https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.js360ms230ms61ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T4SPTL329ms263ms53ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-1004748481&cx=c&gtm=4e64k0299ms255ms41ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js263ms180ms49ms3rd
https://www.nsc.org/cdn-cgi/challenge-platform/scripts/jsd/main.js258ms237ms3ms3rd
https://kit.fontawesome.com/b85f2a5bf4.js177ms138ms13ms3rd
D
Page Weight Inventory
Action
56 resources · 1.8 MB · 283 KB savings available
FIX
56 resources · 1.8 MB · 283 KB savings available
Warning::
Page weight 867 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~283 KB of savings available
Warning::
55 third-party resources (100% of weight)
56 resources · 1.8 MiB · 55 third-party 867.0 KiB over 1MB target
JavaScript 33% · 625.9 KiB
Image 29% · 544.9 KiB
Font 28% · 538.2 KiB
CSS 6% · 114.6 KiB
Other 3% · 51.1 KiB
Document 1% · 16.3 KiB

~283.3 KiB of savings available

Remove unused JavaScript: 283.3 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
1.8 MB transferred, 56 requests
REVIEW
1.8 MB transferred, 56 requests
Info::
Page weighs 4.3 MB (1.8 MB transferred)
Warning::
JavaScript is 608 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 608 KB
Info::
Fonts are 538 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 538 KB
Info::
56 HTTP requests
Info::
Estimated 0.39 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
56 requests
0.39 g CO2 per page load
JavaScript 607.7 KiB 32%
Images 542.7 KiB 29%
Fonts 538.2 KiB 28%
CSS 110.0 KiB 6%
Other 70.5 KiB 4%
HTML 15.8 KiB 1%
Other 3.9 KiB 0%
Other 2.2 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

C
Image Optimization
Action
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cmscdn.nsc.org/cms/nsc.org/media/site-medi... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nsc.org/getmedia/e50ce0a0-9e80-4973-b5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nsc.org/getmedia/fc79f154-4da5-43a1-af... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 543 KB
0 oversized -0 KB
24 legacy format
11 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
11 scripts, 283 KB unused
REVIEW
11 scripts, 283 KB unused
Warning::
https://www.nsc.org/Content/generated/nsc.bundle.f...: 82 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T4S...: 75 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202510.2...: 65 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 61 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 283 KB
283 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.js121 KB82 KB (68%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T4SPTL173 KB75 KB (44%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js124 KB65 KB (53%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-1004748481&cx=c&gtm=4e64k0148 KB61 KB (41%)✓3rd
https://kit.fontawesome.com/b85f2a5bf4.js6 KB—✓3rd
https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.js.LICENSE.txt4 KB—✗3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://ka-p.fontawesome.com/releases/v5.15.4/js/pro-v4-shims.min.js?token=b85f2a5bf44 KB—✓3rd
https://ka-p.fontawesome.com/releases/v5.15.4/js/pro.min.js?token=b85f2a5bf414 KB—✓3rd
https://www.nsc.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?12 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
3 fonts (538 KB)
PASS
3 fonts (538 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

538 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.3 s LCP 8.7 shttps://www.nsc.org/Content/generated/9d7aad73afb47699b6f1.woff9d7aad73afb47699b6f1.woff https://www.nsc.org/Content/generated/9d7aad73afb47699b6f1.woff — 157.0 KiB — 121 ms — font-display: swaphttps://www.nsc.org/Content/generated/be389ea52668f6b22149.woffbe389ea52668f6b22149.woff https://www.nsc.org/Content/generated/be389ea52668f6b22149.woff — 192.1 KiB — 126 ms — font-display: swaphttps://www.nsc.org/Content/generated/2d900034bb5e93f0af37.woff2d900034bb5e93f0af37.woff https://www.nsc.org/Content/generated/2d900034bb5e93f0af37.woff — 189.1 KiB — 126 ms — font-display: swap
9d7aad73afb47699b6f1.woff woff swap
Size 157 KB
Load time 121 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
be389ea52668f6b22149.woff woff swap
Size 192 KB
Load time 126 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
2d900034bb5e93f0af37.woff woff swap
Size 189 KB
Load time 126 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~431 KB and ~862 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
56 requests over 3604ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.3 s LCP 8.7 shttps://nsc.org// https://nsc.org/ — 302 — 197 B — 66 ms — h2https://www.nsc.org/www.nsc.org/ https://www.nsc.org/ — 200 — 15.8 KiB — 2.3 s — h2https://www.nsc.org/Content/generated/nsc.style.6a74533ba49a8987e4ce.csswww.nsc.org/Content/generated/nsc.s... https://www.nsc.org/Content/generated/nsc.style.6a74533ba49a8987e4ce.css — 200 — 110.0 KiB — 50 ms — h2https://kit.fontawesome.com/b85f2a5bf4.jskit.fontawesome.com/b85f2a5bf4.js https://kit.fontawesome.com/b85f2a5bf4.js — 200 — 5.7 KiB — 228 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/logo/nsc-menu.png?ext=.pngcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/logo/nsc-menu.png?ext=.png — 200 — 4.4 KiB — 578 ms — h2https://www.nsc.org/getmedia/fc79f154-4da5-43a1-afd3-efde379a4b6a/safety-maap-mobile.jpg?width=1024&height=500&ext=.jpgwww.nsc.org/getmedia/fc79f154-4da5-... https://www.nsc.org/getmedia/fc79f154-4da5-43a1-afd3-efde379a4b6a/safety-maap-mobile.jpg?width=1024&height=500&ext=.jpg — 200 — 126.4 KiB — 358 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/widgets/value-prop/reputable_2.pngcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/widgets/value-prop/reputable_2.png — 200 — 2.5 KiB — 522 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/widgets/value-prop/reputable.pngcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/widgets/value-prop/reputable.png — 200 — 2.6 KiB — 506 ms — h2https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.jswww.nsc.org/Content/generated/nsc.b... https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.js — 200 — 120.8 KiB — 153 ms — h3https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.js.LICENSE.txtwww.nsc.org/Content/generated/nsc.b... https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.js.LICENSE.txt — 200 — 3.7 KiB — 153 ms — h3https://cmscdn.nsc.org/cms/nsc.org/media/site-media/widgets/value-prop/trustworthy.pngcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/widgets/value-prop/trustworthy.png — 200 — 2.7 KiB — 498 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/homepage/baltimore1000x520.jpgcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/homepage/baltimore1000x520.jpg — 200 — 192.6 KiB — 929 ms — h2https://www.nsc.org/getmedia/61e9e50b-1c59-45dc-b9b7-0ce30ac01496/calendar-inverse.svg?ext=.svgwww.nsc.org/getmedia/61e9e50b-1c59-... https://www.nsc.org/getmedia/61e9e50b-1c59-45dc-b9b7-0ce30ac01496/calendar-inverse.svg?ext=.svg — 200 — 1.1 KiB — 373 ms — h3https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/safety-training/workplace/courses-625x750-min-o.jpgcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/safety-training/workplace/courses-625x750-min-o.jpg — 200 — 29.7 KiB — 598 ms — h2https://www.nsc.org/getmedia/e50ce0a0-9e80-4973-b55d-7183344b5762/s-h130.jpg?width=130&height=130&ext=.jpgwww.nsc.org/getmedia/e50ce0a0-9e80-... https://www.nsc.org/getmedia/e50ce0a0-9e80-4973-b55d-7183344b5762/s-h130.jpg?width=130&height=130&ext=.jpg — 200 — 15.5 KiB — 369 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 90 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-T4SPTLwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-T4SPTL — 200 — 172.9 KiB — 174 ms — h2https://www.nsc.org/Content/generated/9d7aad73afb47699b6f1.woffwww.nsc.org/Content/generated/9d7aa... https://www.nsc.org/Content/generated/9d7aad73afb47699b6f1.woff — 200 — 157.0 KiB — 121 ms — h3https://www.nsc.org/Content/generated/be389ea52668f6b22149.woffwww.nsc.org/Content/generated/be389... https://www.nsc.org/Content/generated/be389ea52668f6b22149.woff — 200 — 192.1 KiB — 126 ms — h3https://www.nsc.org/Content/generated/2d900034bb5e93f0af37.woffwww.nsc.org/Content/generated/2d900... https://www.nsc.org/Content/generated/2d900034bb5e93f0af37.woff — 200 — 189.1 KiB — 126 ms — h3https://cmscdn.nsc.org/cms/nsc.org/media/site-media/eyebrow-icons/icon-sm-green-courses.pngcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/eyebrow-icons/icon-sm-green-courses.png — 200 — 1.0 KiB — 453 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/profile/author/lorraine_martin_2020_60x60.jpgcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/profile/author/lorraine_martin_2020_60x60.jpg — 200 — 3.0 KiB — 449 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/safety-training/workplace/fleet-min-o.jpgcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/safety-training/workplace/fleet-min-o.jpg — 200 — 62.6 KiB — 693 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/workplace/survey600x430.jpgcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/workplace/survey600x430.jpg — 200 — 45.2 KiB — 583 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/company/board-image.jpg?ext=.jpgcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/company/board-image.jpg?ext=.jpg — 200 — 10.8 KiB — 515 ms — 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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 3027ms · 588KB · $40/mo
www.nsc.org
Other
Costly
Execution 836ms
Transfer 16 KB
Monthly Cost $11/mo
Unattributable
Other
Costly
Execution 507ms
Transfer 0 KB
Monthly Cost $7/mo
www.nsc.org
Other
Costly
Execution 360ms
Transfer 121 KB
Unused 68%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 329ms
Transfer 173 KB
Unused 44%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 299ms
Transfer 148 KB
Unused 41%
Monthly Cost $4/mo
OneTrust
Consent
Essential
Execution 263ms
Transfer 124 KB
Unused 53%
Monthly Cost $3/mo
www.nsc.org
Other
Costly
Execution 258ms
Transfer 0 KB
Monthly Cost $3/mo
kit.fontawesome.com
Other
Optional
Execution 177ms
Transfer 6 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • www.nsc.org adds 836ms and costs ~$11/month
  • Unattributable adds 507ms and costs ~$7/month
  • www.nsc.org adds 360ms and costs ~$5/month
  • Google Tag Manager adds 329ms and costs ~$4/month
  • Google Tag Manager adds 299ms and costs ~$4/month
  • www.nsc.org adds 258ms and costs ~$3/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.nsc.org takes 836ms 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 507ms 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.nsc.org takes 360ms 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

68% of www.nsc.org'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

Google Tag Manager takes 329ms 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 299ms 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

53% of OneTrust'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

www.nsc.org takes 258ms 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

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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