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https://jnj.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
67
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.
96
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.

3.44 s

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

5.09 s

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

274 ms

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

0.001

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

4.09 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.

10.49 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
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
15.1 MB transferred, 34 requests
FIX
15.1 MB transferred, 34 requests
Critical::
Page weighs 18.4 MB (15.1 MB transferred)
Warning::
Images are 14.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 14.0 MB
Warning::
JavaScript is 803 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 803 KB
Info::
34 HTTP requests
Info::
Estimated 3.2 g CO2 per page load
15.1 MB / 2.4 MB budget
15.1 MB transferred
34 requests
3.2 g CO2 per page load
Images 14.0 MiB 92%
JavaScript 803.0 KiB 5%
Fonts 170.1 KiB 1%
CSS 130.9 KiB 1%
HTML 54.3 KiB 0%
Other 4.2 KiB 0%
Other 3.1 KiB 0%
Other 0 B 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 (15.1 MiB of 15.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2174ms total JS execution
FIX
2174ms total JS execution
Warning::
https://jnj-content-lab2.brightspotcdn.com/resourc...: 796ms CPU time
Warning::
https://www.jnj.com/: 459ms CPU time
Warning::
Unattributable: 334ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KT2...: 233ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=UA-150...: 125ms CPU time
Warning::
Third-party scripts: 2174ms (100% of total)

Main Thread Breakdown

Script Evaluation 34% Other 29% Style & Layout 18% Script Parsing & Compilation 9% Parse HTML & CSS 6% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styles/default/All.min.49e3b757ba191c55b3da758ff1fbb102.gz.js796ms301ms69ms3rd
https://www.jnj.com/459ms18ms3ms3rd
Unattributable334ms6ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KT26JDNG233ms184ms44ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-15046888-1125ms98ms26ms3rd
https://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/styles/default/All.min.a446dadd35bbf1bf2e19b4af6a57ac5b.gz.css90ms0ms0ms3rd
https://connect.facebook.net/en_US/bundle/sdk.js/79ms59ms19ms3rd
https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js59ms17ms41ms3rd
F
JS Bundles
Action
10 scripts, 503 KB unused
FIX
10 scripts, 503 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://cdn.cookielaw.org/scripttemplates/202602.1...: 107 KB unused (83%)
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.
Info::
Total unused JavaScript: 503 KB
503 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://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js129 KB107 KB (83%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KT26JDNG168 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://jnj-content-lab2.brightspotcdn.com/resource/0000018f-7bf6-dd87-adaf-fbf6d6cd0000/webcomponents-loader/webcomponents-loader.2938a610ca02c611209b1a5ba2884385.gz.js1 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 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

F
Page Weight Inventory
Action
34 resources · 15.1 MB · 503 KB savings available
FIX
34 resources · 15.1 MB · 503 KB savings available
Warning::
Page weight 14.1 MB over 1MB target
Got: 15.1 MB Expected: ≤ 1 MB
Info::
~503 KB of savings available
Warning::
33 third-party resources (100% of weight)
Info::
11 resources over 200KB
34 resources · 15.1 MiB · 33 third-party 14.1 MiB over 1MB target
Image 92% · 14.0 MiB
JavaScript 5% · 803.0 KiB
Font 1% · 170.1 KiB
CSS 1% · 130.9 KiB
Document 0% · 54.5 KiB
Other 0% · 3.1 KiB

~503.3 KiB of savings available

Remove unused JavaScript: 503.3 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
14 images, 0 KB saveable
REVIEW
14 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.
14 images 14.0 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.

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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.4 s LCP 5.1 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 — 8 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 — 9 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 — 7 ms — font-display: swap
JohnsonDisplay-Regular.... woff2 swap
Size 57 KB
Load time 8 ms
Start 809 ms
Risk FOUT — text flashes from fallback to web font
JohnsonText-Regular.6bc... woff2 swap
Size 54 KB
Load time 9 ms
Start 809 ms
Risk FOUT — text flashes from fallback to web font
JohnsonDisplay-RegularI... woff2 swap
Size 59 KB
Load time 7 ms
Start 840 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
—
prefetch
—

3 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
34 requests over 1517ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.4 s LCP 5.1 shttps://jnj.com// https://jnj.com/ — 301 — 237 B — 469 ms — h2https://www.jnj.com/www.jnj.com/ https://www.jnj.com/ — 200 — 54.3 KiB — 145 ms — http/1.1https://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 — 117 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 — 111 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 — 109 ms — h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/8158700/2147483647/strip/true/crop/1920x1079+0+0/resize/1000x562!/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/8158700/2147483647/strip/true/crop/1920x1079+0+0/resize/1000x562!/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 — 103.5 KiB — 116 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 — 8 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 100 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 — 76 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 — 142 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 — 21 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 — 167.7 KiB — 168 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 — 8 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 — 9 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/fb0f21d/2147483647/strip/true/crop/2400x1350+0+235/resize/2048x1152!/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/fb0f21d/2147483647/strip/true/crop/2400x1350+0+235/resize/2048x1152!/format/webp/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F37%2Fa4%2F84046b814edf99e160dfd33360d5%2Fimage003.jpg — 200 — 369.8 KiB — 40 ms — h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/2dc824c/2147483647/strip/true/crop/1440x1080+240+0/resize/2000x1500!/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/2dc824c/2147483647/strip/true/crop/1440x1080+240+0/resize/2000x1500!/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 — 309.2 KiB — 17 ms — h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/562d3a0/2147483647/strip/true/crop/1080x1080+420+0/resize/2000x2000!/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/562d3a0/2147483647/strip/true/crop/1080x1080+420+0/resize/2000x2000!/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 — 1.5 MiB — 70 ms — 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h2https://jnj-content-lab2.brightspotcdn.com/dims4/default/3f069a1/2147483647/strip/true/crop/810x1080+555+0/resize/1464x1952!/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/3f069a1/2147483647/strip/true/crop/810x1080+555+0/resize/1464x1952!/quality/90/?url=https%3A%2F%2Fjnj-production-jnj.s3.us-east-1.amazonaws.com%2Fbrightspot%2F04%2F35%2F9f73ec734e7fad20d93df8edd00f%2F0125-terra-kramer.png — 200 — 2.5 MiB — 258 ms — h2https://www.jnj.com/favicon.icowww.jnj.com/favicon.ico https://www.jnj.com/favicon.ico — 200 — 4.0 KiB — 122 ms — http/1.1
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 2174ms · 889KB · $29/mo
jnj-content-lab2.brightspotcdn.com
Other
Costly
Execution 796ms
Transfer 215 KB
Unused 76%
Monthly Cost $11/mo
www.jnj.com
Other
Costly
Execution 459ms
Transfer 54 KB
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 334ms
Transfer 0 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 233ms
Transfer 168 KB
Unused 47%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 125ms
Transfer 116 KB
Unused 56%
Monthly Cost $2/mo
jnj-content-lab2.brightspotcdn.com
Other
Optional
Execution 90ms
Transfer 129 KB
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 79ms
Transfer 78 KB
Unused 69%
Monthly Cost $1/mo
OneTrust
Consent
Essential
Execution 59ms
Transfer 129 KB
Unused 83%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • jnj-content-lab2.brightspotcdn.com adds 796ms and costs ~$11/month
  • www.jnj.com adds 459ms and costs ~$6/month
  • Unattributable adds 334ms and costs ~$4/month
  • Google Tag Manager adds 233ms 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

jnj-content-lab2.brightspotcdn.com takes 796ms 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

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

www.jnj.com takes 459ms 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 334ms 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 233ms 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

56% of Google Tag Manager's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

69% of Facebook Pixel'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

83% 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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