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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
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.
93
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.

1.84 s

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

2.05 s

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

0 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.

1.84 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.

2.05 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
5.8 MB transferred, 32 requests
FIX
5.8 MB transferred, 32 requests
Critical::
Page weighs 8.6 MB (5.8 MB transferred)
Warning::
Images are 4.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.8 MB
Warning::
JavaScript is 665 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 665 KB
Info::
32 HTTP requests
Info::
Estimated 1.2 g CO2 per page load
5.8 MB / 2.4 MB budget
5.8 MB transferred
32 requests
1.2 g CO2 per page load
Images 4.8 MiB 83%
JavaScript 664.6 KiB 11%
Fonts 170.1 KiB 3%
CSS 130.9 KiB 2%
HTML 54.3 KiB 1%
Other 4.2 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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 (5.8 MiB of 5.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
9 scripts, 397 KB unused
FIX
9 scripts, 397 KB unused
Warning::
https://jnj-content-lab2.brightspotcdn.com/resourc...: 163 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KT2...: 78 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-150...: 64 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/bundle/sdk.js/: 54 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://app.bowencraggs.com/scripts/a686ddca-58a7-...: 38 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 397 KB
397 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styles/default/All.min.49e3b757ba191c55b3da758ff1fbb102.gz.js215 KB163 KB (76%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KT26JDNG167 KB78 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-15046888-1116 KB64 KB (56%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB54 KB (69%)✓3rd
https://app.bowencraggs.com/scripts/a686ddca-58a7-4bcb-9cce-fb56de49020c.js61 KB38 KB (63%)✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 KB—✓3rd
https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/webcomponents-loader/webcomponents-loader.2938a610ca02c611209b1a5ba2884385.gz.js1 KB—✓3rd
https://connect.facebook.net/en_US/sdk.js5 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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

D
Page Weight Inventory
Action
32 resources · 5.8 MB · 397 KB savings available
FIX
32 resources · 5.8 MB · 397 KB savings available
Warning::
Page weight 4.8 MB over 1MB target
Got: 5.8 MB Expected: ≤ 1 MB
Info::
~397 KB of savings available
Warning::
31 third-party resources (100% of weight)
Info::
6 resources over 200KB
32 resources · 5.8 MiB · 31 third-party 4.8 MiB over 1MB target
Image 83% · 4.8 MiB
JavaScript 11% · 664.6 KiB
Font 3% · 170.1 KiB
CSS 2% · 130.9 KiB
Document 1% · 54.5 KiB

~396.8 KiB of savings available

Remove unused JavaScript: 396.8 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, max-age=0

DirectiveValueMeaning
no-store—Never cache this response
max-age0Cache for 0 seconds
C
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://jnj-content-lab2.brightspotcdn.com/ac/25/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 4.8 MB
0 oversized -0 KB
6 legacy format
2 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

Performance issues directly impact user engagement and conversion rates.

B
JS Execution Cost
514ms total JS execution
REVIEW
514ms total JS execution
Info::
https://jnj-content-lab2.brightspotcdn.com/resourc...: 195ms CPU time
Info::
https://www.jnj.com/: 189ms CPU time
Info::
Unattributable: 75ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KT2...: 54ms CPU time
Warning::
Third-party scripts: 514ms (100% of total)

Main Thread Breakdown

Script Evaluation 30% Other 29% Style & Layout 22% Script Parsing & Compilation 7% Rendering 7% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styles/default/All.min.49e3b757ba191c55b3da758ff1fbb102.gz.js195ms75ms18ms3rd
https://www.jnj.com/189ms5ms1ms3rd
Unattributable75ms1ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KT26JDNG54ms43ms10ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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 (170 KB)
PASS
3 fonts (170 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

170 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 500 ms 1.0 s 1.5 s 2.0 s FCP 1.8 s LCP 2.0 shttps://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Display/JohnsonDisplay-Regular.7f099120e0999704e97124f39137cbda.woff2JohnsonDisplay-Regular.... https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Display/JohnsonDisplay-Regular.7f099120e0999704e97124f39137cbda.woff2 — 57.3 KiB — 9 ms — font-display: swaphttps://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Text/JohnsonText-Regular.6bcb78aa0365ae621c10bafe840074a4.woff2JohnsonText-Regular.6bc... https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Text/JohnsonText-Regular.6bcb78aa0365ae621c10bafe840074a4.woff2 — 54.2 KiB — 10 ms — font-display: swaphttps://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Display/JohnsonDisplay-RegularItalic.b8dbbcf161ff50a51f7b98db4275b2bf.woff2JohnsonDisplay-RegularI... https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Display/JohnsonDisplay-RegularItalic.b8dbbcf161ff50a51f7b98db4275b2bf.woff2 — 58.6 KiB — 14 ms — font-display: swap
JohnsonDisplay-Regular.... woff2 swap
Size 57 KB
Load time 9 ms
Start 668 ms
Risk FOUT — text flashes from fallback to web font
JohnsonText-Regular.6bc... woff2 swap
Size 54 KB
Load time 10 ms
Start 668 ms
Risk FOUT — text flashes from fallback to web font
JohnsonDisplay-RegularI... woff2 swap
Size 59 KB
Load time 14 ms
Start 709 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
32 requests over 1154ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.8 s LCP 2.0 shttps://jnj.com// https://jnj.com/ — 301 — 238 B — 446 ms — h2https://www.jnj.com/www.jnj.com/ https://www.jnj.com/ — 200 — 54.3 KiB — 81 ms — http/1.1https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 132 ms — https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styles/default/All.min.a446dadd35bbf1bf2e19b4af6a57ac5b.gz.cssjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styles/default/All.min.a446dadd35bbf1bf2e19b4af6a57ac5b.gz.css — 200 — 128.6 KiB — 25 ms — h2https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/webcomponents-loader/webcomponents-loader.2938a610ca02c611209b1a5ba2884385.gz.jsjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/webcomponents-loader/webcomponents-loader.2938a610ca02c611209b1a5ba2884385.gz.js — 200 — 1.4 KiB — 15 ms — h2https://jnj-content-lab2.brightspotcdn.com/ac/25/bd2078f54d5992dd486ed26140ce/johnson-johnson-logo.svgjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/ac/25/bd2078f54d5992dd486ed26140ce/johnson-johnson-logo.svg — 200 — 6.6 KiB — 16 ms — h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/3c23085/2147483647/strip/true/crop/1920x1080+0+0/resize/1440x810!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F91%2F6b%2F3e393c094b3a9fad58272e7147a7%2Fjnj-hp-lede-updated-1225-v2-2.pngjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/dims4/default/3c23085/2147483647/strip/true/crop/1920x1080+0+0/resize/1440x810!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F91%2F6b%2F3e393c094b3a9fad58272e7147a7%2Fjnj-hp-lede-updated-1225-v2-2.png — 200 — 165.0 KiB — 24 ms — h2https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styles/default/All.min.49e3b757ba191c55b3da758ff1fbb102.gz.jsjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styles/default/All.min.49e3b757ba191c55b3da758ff1fbb102.gz.js — 200 — 215.2 KiB — 9 ms — h2https://fonts.googleapis.com/css?family=Roboto:300,400,700|Merriweather:300,400,700&display=swapfonts.googleapis.com/css?family=Rob... https://fonts.googleapis.com/css?family=Roboto:300,400,700|Merriweather:300,400,700&display=swap — 200 — 2.3 KiB — 70 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-15046888-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-15046888-1 — 200 — 116.1 KiB — 138 ms — h2https://connect.facebook.net/en_US/sdk.jsconnect.facebook.net/en_US/sdk.js https://connect.facebook.net/en_US/sdk.js — 200 — 5.0 KiB — 37 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-KT26JDNGwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KT26JDNG — 200 — 167.4 KiB — 165 ms — h2https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Display/JohnsonDisplay-Regular.7f099120e0999704e97124f39137cbda.woff2jnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Display/JohnsonDisplay-Regular.7f099120e0999704e97124f39137cbda.woff2 — 200 — 57.3 KiB — 9 ms — h2https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Text/JohnsonText-Regular.6bcb78aa0365ae621c10bafe840074a4.woff2jnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styleguide/assets/fonts/Johnson-Text/JohnsonText-Regular.6bcb78aa0365ae621c10bafe840074a4.woff2 — 200 — 54.2 KiB — 10 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZlcnNpb249IjEuMSIga…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZlcnNpb249IjEuMSIga… — 200 — 0 B — 0 ms — datahttps://jnj-content-lab2.brightspotcdn.com/dims4/default/a595d81/2147483647/strip/true/crop/2400x1350+0+235/resize/1024x576!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F37%2Fa4%2F84046b814edf99e160dfd33360d5%2Fimage003.jpgjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/dims4/default/a595d81/2147483647/strip/true/crop/2400x1350+0+235/resize/1024x576!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F37%2Fa4%2F84046b814edf99e160dfd33360d5%2Fimage003.jpg — 200 — 125.1 KiB — 22 ms — h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/6eee4c4/2147483647/strip/true/crop/1440x1080+240+0/resize/1000x750!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F77%2Ff5%2F0484a5bd4a0db0478a0fddeb5e74%2F0426-q1-2026-earnings-lede7.pngjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/dims4/default/6eee4c4/2147483647/strip/true/crop/1440x1080+240+0/resize/1000x750!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F77%2Ff5%2F0484a5bd4a0db0478a0fddeb5e74%2F0426-q1-2026-earnings-lede7.png — 200 — 99.8 KiB — 24 ms — h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/10cc523/2147483647/strip/true/crop/1080x1080+420+0/resize/1000x1000!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F3d%2Fdc%2F0093626c46d4a09b8c639ad64e1e%2F0226-head-and-neck-cancer-lede-opt2.pngjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/dims4/default/10cc523/2147483647/strip/true/crop/1080x1080+420+0/resize/1000x1000!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F3d%2Fdc%2F0093626c46d4a09b8c639ad64e1e%2F0226-head-and-neck-cancer-lede-opt2.png — 200 — 379.9 KiB — 33 ms — h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/158aa52/2147483647/strip/true/crop/1080x1080+420+0/resize/1000x1000!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F8e%2Ff8%2F1f42332a40a38a791ecb650c9df2%2F0326-fortune-most-innovative-20264.pngjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/dims4/default/158aa52/2147483647/strip/true/crop/1080x1080+420+0/resize/1000x1000!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F8e%2Ff8%2F1f42332a40a38a791ecb650c9df2%2F0326-fortune-most-innovative-20264.png — 200 — 129.4 KiB — 28 ms — 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https://jnj-content-lab2.brightspotcdn.com/dims4/default/8aa60ce/2147483647/strip/true/crop/810x1080+574+0/resize/732x976!/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2Fb8%2Fa8%2F95b3de8d4974879eee2ae9503347%2Fwhat-is-cardiac-ablation-c124.jpg — 200 — 128.5 KiB — 22 ms — h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/6b3e100/2147483647/strip/true/crop/810x1080+555+0/resize/732x976!/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F04%2F35%2F9f73ec734e7fad20d93df8edd00f%2F0125-terra-kramer.pngjnj-content-lab2.brightspotcdn.com/... https://jnj-content-lab2.brightspotcdn.com/dims4/default/6b3e100/2147483647/strip/true/crop/810x1080+555+0/resize/732x976!/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F04%2F35%2F9f73ec734e7fad20d93df8edd00f%2F0125-terra-kramer.png — 200 — 866.6 KiB — 89 ms — h2https://www.jnj.com/favicon.icowww.jnj.com/favicon.ico 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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 514ms · 437KB · $7/mo
jnj-content-lab2.brightspotcdn.com
Other
Optional
Execution 195ms
Transfer 215 KB
Unused 76%
Monthly Cost $3/mo
www.jnj.com
Other
Optional
Execution 189ms
Transfer 54 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 75ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 54ms
Transfer 167 KB
Unused 47%
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

76% of jnj-content-lab2.brightspotcdn.com'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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