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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
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.
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.

677 ms

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

1.82 s

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

11 ms

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

0.006

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

1.30 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.

2.45 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 (2.0 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
58 resources · 2.0 MB · 286 KB savings available
FIX
58 resources · 2.0 MB · 286 KB savings available
Warning::
Page weight 1020 KB over 1MB target
Got: 2.0 MB Expected: ≤ 1 MB
Info::
~286 KB of savings available
Warning::
57 third-party resources (100% of weight)
58 resources · 2.0 MiB · 57 third-party 1020.4 KiB over 1MB target
Font 35% · 711.6 KiB
JavaScript 31% · 625.5 KiB
Image 26% · 524.6 KiB
CSS 6% · 114.7 KiB
Other 3% · 51.3 KiB
Document 1% · 16.7 KiB

~285.5 KiB of savings available

Remove unused JavaScript: 285.5 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
2.0 MB transferred, 58 requests
REVIEW
2.0 MB transferred, 58 requests
Info::
Page weighs 4.5 MB (2.0 MB transferred)
Info::
Fonts are 712 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 712 KB
Warning::
JavaScript is 607 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 607 KB
Info::
58 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
58 requests
0.42 g CO2 per page load
Fonts 711.6 KiB 35%
JavaScript 607.3 KiB 30%
Images 522.4 KiB 26%
CSS 110.1 KiB 5%
Other 70.4 KiB 3%
HTML 16.0 KiB 1%
Other 4.1 KiB 0%
Other 2.5 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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
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://www.nsc.org/getmedia/dee4dbc2-8c08-487b-ae... 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://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.
24 images 522 KB
0 oversized -0 KB
24 legacy format
12 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

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
655ms total JS execution
REVIEW
655ms total JS execution
Info::
https://www.nsc.org/: 194ms CPU time
Info::
Unattributable: 124ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-T4S...: 76ms CPU time
Info::
https://www.nsc.org/Content/generated/nsc.bundle.f...: 76ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202510.2...: 74ms CPU time
Warning::
Third-party scripts: 655ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 18% Style & Layout 11% Script Parsing & Compilation 8% Parse HTML & CSS 5% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.nsc.org/194ms56ms1ms3rd
Unattributable124ms31ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T4SPTL76ms60ms13ms3rd
https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.js76ms60ms11ms3rd
https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js74ms49ms16ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-1004748481&cx=c&gtm=4e64k056ms46ms9ms3rd
https://www.nsc.org/cdn-cgi/challenge-platform/scripts/jsd/main.js55ms53ms1ms3rd
C
JS Bundles
Action
11 scripts, 286 KB unused
REVIEW
11 scripts, 286 KB unused
Warning::
https://www.nsc.org/Content/generated/nsc.bundle.f...: 84 KB unused (70%)
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: 286 KB
286 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nsc.org/Content/generated/nsc.bundle.fda99dc6666dac98cd35.js121 KB84 KB (70%)✓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
4 fonts (712 KB)
PASS
4 fonts (712 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

712 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 500 ms 1.0 s 1.5 s FCP 677 ms LCP 1.8 shttps://www.nsc.org/Content/generated/be389ea52668f6b22149.woffbe389ea52668f6b22149.woff https://www.nsc.org/Content/generated/be389ea52668f6b22149.woff — 192.1 KiB — 74 ms — font-display: swaphttps://www.nsc.org/Content/generated/9d7aad73afb47699b6f1.woff9d7aad73afb47699b6f1.woff https://www.nsc.org/Content/generated/9d7aad73afb47699b6f1.woff — 156.9 KiB — 67 ms — font-display: swaphttps://www.nsc.org/Content/generated/2d900034bb5e93f0af37.woff2d900034bb5e93f0af37.woff https://www.nsc.org/Content/generated/2d900034bb5e93f0af37.woff — 189.1 KiB — 73 ms — font-display: swaphttps://www.nsc.org/content/generated/1b9787f47210cb2cb87b.woff1b9787f47210cb2cb87b.woff https://www.nsc.org/content/generated/1b9787f47210cb2cb87b.woff — 173.4 KiB — 368 ms — font-display: swap
be389ea52668f6b22149.woff woff swap
Size 192 KB
Load time 74 ms
Start 697 ms
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
9d7aad73afb47699b6f1.woff woff swap
Size 157 KB
Load time 67 ms
Start 697 ms
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 73 ms
Start 698 ms
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
1b9787f47210cb2cb87b.woff woff swap
Size 173 KB
Load time 368 ms
Start 1.1 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 ~569 KB and ~1138 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+
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
58 requests over 1729ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 677 ms LCP 1.8 shttps://nsc.org// https://nsc.org/ — 302 — 239 B — 46 ms — h3https://www.nsc.org/www.nsc.org/ https://www.nsc.org/ — 200 — 16.0 KiB — 544 ms — h3https://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 — 110.1 KiB — 70 ms — h3https://kit.fontawesome.com/b85f2a5bf4.jskit.fontawesome.com/b85f2a5bf4.js https://kit.fontawesome.com/b85f2a5bf4.js — 200 — 5.7 KiB — 72 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 — 542 ms — h2https://www.nsc.org/getmedia/dee4dbc2-8c08-487b-ae28-6ba5ed902d69/safety-maap-fade2.jpg?width=1440&height=520&ext=.jpgwww.nsc.org/getmedia/dee4dbc2-8c08-... https://www.nsc.org/getmedia/dee4dbc2-8c08-487b-ae28-6ba5ed902d69/safety-maap-fade2.jpg?width=1440&height=520&ext=.jpg — 200 — 106.1 KiB — 365 ms — h3https://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 — 494 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 — 468 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 — 45 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 — 137 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 — 451 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 — 902 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 — 143 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 — 564 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 — 145 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 68 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 — 170 ms — h2https://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 — 484 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 — 483 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 — 637 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 — 547 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/company/events-icon.jpg?ext=.jpgcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/company/events-icon.jpg?ext=.jpg — 200 — 14.5 KiB — 460 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 — 474 ms — h2https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/workplace/blog-icon.jpg?ext=.jpgcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/images/workplace/blog-icon.jpg?ext=.jpg — 200 — 15.2 KiB — 487 ms — 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h2https://www.google.com/pagead/1p-conversion/1004748481/?random=925772459&cv=11&fst=1776888328662&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64k0v875596140z872486886za20gzb72486886zd72486886xea&gcd=13l3lPl2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~118128923&u_w=800&u_h=600&url=https%3A%2F%2Fwww.nsc.org%2F&rcb=2&label=sYlHCILSsJkaEMH9jN8D&capi=1&frm=0&tiba=National%20Safety%20Council%20-%20Save%20lives%2C%20from%20the%20workplace%20to%20anyplace&value=0&hn=www.googleadservices.com&npa=1&pscdl=noapi&auid=1484936497.1776888329&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&ec_mode=a&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&em=tv.1&fmt=8&ct_cookie_present=false&crd=CLTesQII8t-xAgit4bECCKG4sQIIscGxAgiwwbECCLHDsQIIisWxAgjCybECCLTGsQIIk9qxAgjb3LECCIfbsQII08WxAgjrzLECCO3OsQII1c-xAgj02rECCJfUsQIIyduxAgix4bECCLPhsQIIpt2xAgiw3rECCIDbsQJKK25vdC1ldmVudC1zb3VyY2UsIHRyaWdnZXI9bmF2aWdhdGlvbi1zb3VyY2VaAwoBAWIDCgED&cerd=CgEA&fsk=ChEI8OOhzwYQy-2I0MH1tu65ARIsADfqr1XCK_dPakqb5KHs9JwcG4A3HLgVvvSf9kEJRTVFTNnMPHqxlV66iE8aAt25&pscrd=IhMI75SO7aCClAMVUVCkBB2WPTFeMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOhRodHRwczovL3d3dy5uc2Mub3JnL0JXQ2hFSThPT2h6d1lRMWNpang0LWdsNGFWQVJJc0FJOEVLWjJmYl9MWjNENDdSMlc5eUtoN285RXUyYjZONk5HdnlERVZvcUhJMHhoOXlqb1Y2REdoRGg0egwICWIICAAQABgAIAA&is_vtc=1&cid=CAQSWwAFq6B9wF8QpgWvudPBzTNw0Ao90ca3Gl4wNDoxy9Wz9vq5CXVt2S3CR26N-7qDZC5qfP8RfMk02IfH4m9gLIxyzO6IvuYvR5eSxRlVpZRSq_fIO4yvGrLaIIM&eitems=ChAI8OOhzwYQnf3X0YH146MTEh0AvW1FkVK4C--ZFcfq1zQNt3ohXHC2M8_0VRWdoA&random=1812131722www.google.com/pagead/1p-conversion... 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— 302 — 22 B — 191 ms — h3https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.jscdn.cookielaw.org/scripttemplates/2... https://cdn.cookielaw.org/scripttemplates/202510.2.0/otBannerSdk.js — 200 — 124.1 KiB — 59 ms — 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https://www.google.es/pagead/1p-conversion/1004748481/?random=925772459&cv=11&fst=1776888328662&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64k0v875596140z872486886za20gzb72486886zd72486886xea&gcd=13l3lPl2l1l1&dma_cps=a&dma=1&tag_exp=0~115938466~115938468~117266401~118128923&u_w=800&u_h=600&url=https%3A%2F%2Fwww.nsc.org%2F&rcb=2&label=sYlHCILSsJkaEMH9jN8D&capi=1&frm=0&tiba=National%20Safety%20Council%20-%20Save%20lives%2C%20from%20the%20workplace%20to%20anyplace&value=0&hn=www.googleadservices.com&npa=1&pscdl=noapi&auid=1484936497.1776888329&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=0&uam=&uap=macOS&uapv=10.15.7&uaw=0&ec_mode=a&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&em=tv.1&fmt=8&ct_cookie_present=false&crd=CLTesQII8t-xAgit4bECCKG4sQIIscGxAgiwwbECCLHDsQIIisWxAgjCybECCLTGsQIIk9qxAgjb3LECCIfbsQII08WxAgjrzLECCO3OsQII1c-xAgj02rECCJfUsQIIyduxAgix4bECCLPhsQIIpt2xAgiw3rECCIDbsQJKK25vdC1ldmVudC1zb3VyY2UsIHRyaWdnZXI9bmF2aWdhdGlvbi1zb3VyY2VaAwoBAWIDCgED&cerd=CgEA&fsk=ChEI8OOhzwYQy-2I0MH1tu65ARIsADfqr1XCK_dPakqb5KHs9JwcG4A3HLgVvvSf9kEJRTVFTNnMPHqxlV66iE8aAt25&is_vtc=1&cid=CAQSWwAFq6B9wF8QpgWvudPBzTNw0Ao90ca3Gl4wNDoxy9Wz9vq5CXVt2S3CR26N-7qDZC5qfP8RfMk02IfH4m9gLIxyzO6IvuYvR5eSxRlVpZRSq_fIO4yvGrLaIIM&eitems=ChAI8OOhzwYQnf3X0YH146MTEh0AvW1FkVK4C--ZFcfq1zQNt3ohXHC2M8_0VRWdoA&random=1812131722&ipr=y&pscrd=IhMI75SO7aCClAMVUVCkBB2WPTFeMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOhRodHRwczovL3d3dy5uc2Mub3JnL0JXQ2hFSThPT2h6d1lRMWNpang0LWdsNGFWQVJJc0FJOEVLWjJmYl9MWjNENDdSMlc5eUtoN285RXUyYjZONk5HdnlERVZvcUhJMHhoOXlqb1Y2REdoRGg0egwICWIICAAQABgAIAA 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4.6 KiB — 30 ms — h2https://cdn.cookielaw.org/logos/static/ot_close.svgcdn.cookielaw.org/logos/static/ot_c... https://cdn.cookielaw.org/logos/static/ot_close.svg — 200 — 626 B — 26 ms — h2https://cdn.cookielaw.org/logos/static/ot_guard_logo.svgcdn.cookielaw.org/logos/static/ot_g... https://cdn.cookielaw.org/logos/static/ot_guard_logo.svg — 200 — 489 B — 29 ms — h2https://cdn.cookielaw.org/logos/17787a31-b58c-4dbb-b586-f525634b090c/b7f09eb7-9a38-4d9b-9404-f62783c8c291/9fc11eb6-8689-4365-80ff-e1cf8d83ff42/nsc-menu.pngcdn.cookielaw.org/logos/17787a31-b5... https://cdn.cookielaw.org/logos/17787a31-b58c-4dbb-b586-f525634b090c/b7f09eb7-9a38-4d9b-9404-f62783c8c291/9fc11eb6-8689-4365-80ff-e1cf8d83ff42/nsc-menu.png — 200 — 4.2 KiB — 27 ms — h2https://cdn.cookielaw.org/logos/static/powered_by_logo.svgcdn.cookielaw.org/logos/static/powe... https://cdn.cookielaw.org/logos/static/powered_by_logo.svg — 200 — 2.5 KiB — 27 ms — h2https://www.nsc.org/cdn-cgi/rum?www.nsc.org/cdn-cgi/rum? https://www.nsc.org/cdn-cgi/rum? — 204 — 230 B — 22 ms — h3https://cmscdn.nsc.org/cms/nsc.org/media/site-media/icon/favicon.pngcmscdn.nsc.org/cms/nsc.org/media/si... https://cmscdn.nsc.org/cms/nsc.org/media/site-media/icon/favicon.png — 200 — 1.7 KiB — 134 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 655ms · 582KB · $9/mo
www.nsc.org
Other
Optional
Execution 194ms
Transfer 16 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 124ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 76ms
Transfer 173 KB
Unused 44%
Monthly Cost $1/mo
www.nsc.org
Other
Optional
Execution 76ms
Transfer 121 KB
Unused 70%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 74ms
Transfer 124 KB
Unused 53%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 56ms
Transfer 148 KB
Unused 41%
Monthly Cost $1/mo
www.nsc.org
Other
Optional
Execution 55ms
Transfer 0 KB
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

70% 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

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

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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