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https://nngroup.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
100
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.

1.28 s

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

2.27 s

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

50 ms

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

0.034

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.

3.09 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 4 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
13 scripts, 322 KB unused
FIX
13 scripts, 322 KB unused
Warning::
https://media.nngroup.com/static/js/output.8221eea...: 92 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-630S...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-165...: 65 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-THJ...: 61 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 34 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 322 KB
322 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://media.nngroup.com/static/js/output.8221eeaec7a2.js159 KB92 KB (58%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-630S9ESVKM&cx=c&gtm=4e64k0h2173 KB69 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-16569705699&cx=c&gtm=4e64k0h2144 KB65 KB (45%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-THJDDHK183 KB61 KB (33%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (35%)✓3rd
https://tools.luckyorange.com/core/lo.js?site-id=e5c040f414 KB—✓3rd
https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/banner.js8 KB—✓3rd
https://media.nngroup.com/static/bundles/consent.js5 KB—✓3rd
https://bat.bing.com/bat.js15 KB—✓3rd
https://media.nngroup.com/static/js/output.3e6a450e0b15.js20 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
50 resources · 1.7 MB · 322 KB savings available
FIX
50 resources · 1.7 MB · 322 KB savings available
Warning::
Page weight 674 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~322 KB of savings available
Warning::
49 third-party resources (100% of weight)
50 resources · 1.7 MiB · 49 third-party 674.3 KiB over 1MB target
JavaScript 51% · 871.6 KiB
Image 35% · 586.4 KiB
Font 7% · 114.0 KiB
CSS 5% · 78.0 KiB
Document 2% · 33.6 KiB
Other 1% · 14.8 KiB

~322.0 KiB of savings available

Remove unused JavaScript: 322.0 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
1.7 MB transferred, 50 requests
REVIEW
1.7 MB transferred, 50 requests
Info::
Page weighs 4.2 MB (1.7 MB transferred)
Warning::
JavaScript is 872 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 872 KB
Info::
50 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
50 requests
0.35 g CO2 per page load
JavaScript 871.6 KiB 51%
Images 579.6 KiB 34%
Fonts 114.0 KiB 7%
CSS 78.0 KiB 5%
HTML 32.7 KiB 2%
Other 14.3 KiB 1%
Other 7.7 KiB 0%
Other 502 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

C
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://media.nngroup.com/media/courses/icons/Cour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.nngroup.com/static/img/logos/amazon-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.nngroup.com/media/courses/icons/Cour... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 580 KB
0 oversized -0 KB
16 legacy format
3 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

B
JS Execution Cost
965ms total JS execution
REVIEW
965ms total JS execution
Warning::
Unattributable: 410ms CPU time
Info::
https://www.nngroup.com/: 194ms CPU time
Info::
https://media.nngroup.com/static/js/output.8221eea...: 180ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-THJ...: 99ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-630S...: 81ms CPU time
Warning::
Third-party scripts: 965ms (100% of total)

Main Thread Breakdown

Other 42% Script Evaluation 39% Style & Layout 8% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
Unattributable410ms7ms0ms3rd
https://www.nngroup.com/194ms2ms1ms3rd
https://media.nngroup.com/static/js/output.8221eeaec7a2.js180ms136ms17ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-THJDDHK99ms80ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-630S9ESVKM&cx=c&gtm=4e64k0h281ms64ms14ms3rd
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 (114 KB)
PASS
3 fonts (114 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

114 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 1.3 s LCP 2.3 shttps://media.nngroup.com/static/fonts/SourceSansVariable.subset.min.v4.woff2SourceSansVariable.subs... https://media.nngroup.com/static/fonts/SourceSansVariable.subset.min.v4.woff2 — 23.6 KiB — 12 ms — font-display: swaphttps://media.nngroup.com/static/fonts/Inter-VariableFont_opszwght.woff2Inter-VariableFont_opsz... https://media.nngroup.com/static/fonts/Inter-VariableFont_opszwght.woff2 — 69.3 KiB — 13 ms — font-display: swaphttps://media.nngroup.com/static/fonts/SourceSansItalicVariable.subset.min.v4.woff2SourceSansItalicVariabl... https://media.nngroup.com/static/fonts/SourceSansItalicVariable.subset.min.v4.woff2 — 21.0 KiB — 5 ms — font-display: swap
SourceSansVariable.subs... woff2 swap
Size 24 KB
Load time 12 ms
Start 223 ms
Risk FOUT — text flashes from fallback to web font
Inter-VariableFont_opsz... woff2 swap
Size 69 KB
Load time 13 ms
Start 224 ms
Risk FOUT — text flashes from fallback to web font
SourceSansItalicVariabl... woff2 swap
Size 21 KB
Load time 5 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
50 requests over 1691ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.3 shttps://nngroup.com// https://nngroup.com/ — 301 — 947 B — 62 ms — h2https://www.nngroup.com/www.nngroup.com/ https://www.nngroup.com/ — 200 — 32.7 KiB — 44 ms — h2https://media.nngroup.com/static/bundles/consent.jsmedia.nngroup.com/static/bundles/co... https://media.nngroup.com/static/bundles/consent.js — 200 — 4.6 KiB — 30 ms — h2https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/script.jscdn-cookieyes.com/client_data/1a1cf... https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/script.js — 200 — 8.9 KiB — 70 ms — h2https://media.nngroup.com/static/css/output.e9c610b5facf.cssmedia.nngroup.com/static/css/output... https://media.nngroup.com/static/css/output.e9c610b5facf.css — 200 — 701 B — 25 ms — h2https://media.nngroup.com/static/css/output.8a2ac8cc91c7.cssmedia.nngroup.com/static/css/output... https://media.nngroup.com/static/css/output.8a2ac8cc91c7.css — 200 — 77.3 KiB — 34 ms — h2https://media.nngroup.com/media/courses/icons/CourseAI_for_Design_Workflows_0mcAr2s.svgmedia.nngroup.com/media/courses/ico... https://media.nngroup.com/media/courses/icons/CourseAI_for_Design_Workflows_0mcAr2s.svg — 200 — 1.6 KiB — 17 ms — h2https://media.nngroup.com/media/courses/icons/CourseUsability_Testing.svgmedia.nngroup.com/media/courses/ico... https://media.nngroup.com/media/courses/icons/CourseUsability_Testing.svg — 200 — 987 B — 16 ms — h2https://media.nngroup.com/media/images/SP_Thumbnails_12_ZXbCnxY.width-330.pngmedia.nngroup.com/media/images/SP_T... https://media.nngroup.com/media/images/SP_Thumbnails_12_ZXbCnxY.width-330.png — 200 — 84.9 KiB — 6 ms — h2https://media.nngroup.com/media/images/SP_Thumbnails_7_TA3lF90.width-330.pngmedia.nngroup.com/media/images/SP_T... https://media.nngroup.com/media/images/SP_Thumbnails_7_TA3lF90.width-330.png — 200 — 92.6 KiB — 7 ms — h2https://media.nngroup.com/static/img/logos/amazon-logo-home.svgmedia.nngroup.com/static/img/logos/... https://media.nngroup.com/static/img/logos/amazon-logo-home.svg — 200 — 33.9 KiB — 5 ms — h2https://media.nngroup.com/static/js/output.3e6a450e0b15.jsmedia.nngroup.com/static/js/output.... https://media.nngroup.com/static/js/output.3e6a450e0b15.js — 200 — 19.5 KiB — 3 ms — h2https://tools.luckyorange.com/core/lo.js?site-id=e5c040f4tools.luckyorange.com/core/lo.js?si... https://tools.luckyorange.com/core/lo.js?site-id=e5c040f4 — 200 — 14.3 KiB — 9 ms — h2https://media.nngroup.com/static/js/output.8221eeaec7a2.jsmedia.nngroup.com/static/js/output.... https://media.nngroup.com/static/js/output.8221eeaec7a2.js — 200 — 159.3 KiB — 7 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-THJDDHKwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-THJDDHK — 200 — 182.7 KiB — 172 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 73 ms — h3https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/banner.jscdn-cookieyes.com/client_data/1a1cf... https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/banner.js — 200 — 8.3 KiB — 27 ms — h2https://media.nngroup.com/static/fonts/SourceSansVariable.subset.min.v4.woff2media.nngroup.com/static/fonts/Sour... https://media.nngroup.com/static/fonts/SourceSansVariable.subset.min.v4.woff2 — 200 — 23.6 KiB — 12 ms — h2https://media.nngroup.com/static/fonts/Inter-VariableFont_opszwght.woff2media.nngroup.com/static/fonts/Inte... https://media.nngroup.com/static/fonts/Inter-VariableFont_opszwght.woff2 — 200 — 69.3 KiB — 13 ms — h2https://media.nngroup.com/static/img/icons/icon-play.svgmedia.nngroup.com/static/img/icons/... https://media.nngroup.com/static/img/icons/icon-play.svg — 200 — 1.3 KiB — 5 ms — h2https://media.nngroup.com/static/img/banners/ux-banner.svgmedia.nngroup.com/static/img/banner... https://media.nngroup.com/static/img/banners/ux-banner.svg — 200 — 5.5 KiB — 4 ms — h2https://media.nngroup.com/media/articles/card_covers/Less_Chat-cover.png.324x324_q75_autocrop_crop-smart_upscale.pngmedia.nngroup.com/media/articles/ca... https://media.nngroup.com/media/articles/card_covers/Less_Chat-cover.png.324x324_q75_autocrop_crop-smart_upscale.png — 200 — 15.5 KiB — 7 ms — h2https://media.nngroup.com/media/articles/card_covers/6_Competencies-card.png.324x324_q75_autocrop_crop-smart_upscale.pngmedia.nngroup.com/media/articles/ca... https://media.nngroup.com/media/articles/card_covers/6_Competencies-card.png.324x324_q75_autocrop_crop-smart_upscale.png — 200 — 29.4 KiB — 10 ms — h2https://media.nngroup.com/media/videos/card_covers/card_Use_AI_Responsibly_in_Analysis.png.324x324_q75_autocrop_crop-smart_upscale.pngmedia.nngroup.com/media/videos/card... https://media.nngroup.com/media/videos/card_covers/card_Use_AI_Responsibly_in_Analysis.png.324x324_q75_autocrop_crop-smart_upscale.png — 200 — 163.7 KiB — 15 ms — h2https://media.nngroup.com/media/videos/card_covers/card_Field_Guide_to_Explaining_UX_Strategy.png.324x324_q75_autocrop_crop-smart_upscale.pngmedia.nngroup.com/media/videos/card... https://media.nngroup.com/media/videos/card_covers/card_Field_Guide_to_Explaining_UX_Strategy.png.324x324_q75_autocrop_crop-smart_upscale.png — 200 — 147.4 KiB — 16 ms — h2https://www.nngroup.com/api/cart/status/www.nngroup.com/api/cart/status/ https://www.nngroup.com/api/cart/status/ — 200 — 1.1 KiB — 391 ms — h2https://www.nngroup.com/api/user/status/www.nngroup.com/api/user/status/ https://www.nngroup.com/api/user/status/ — 200 — 1.1 KiB — 374 ms — h2https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/ZTPJpPrc.jsoncdn-cookieyes.com/client_data/1a1cf... https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/ZTPJpPrc.json — 200 — 1.2 KiB — 63 ms — h2https://directory.cookieyes.com/api/v1/ipdirectory.cookieyes.com/api/v1/ip https://directory.cookieyes.com/api/v1/ip — 200 — 410 B — 84 ms — h3https://www.googletagmanager.com/gtag/js?id=AW-16569705699&cx=c&gtm=4e64k0h2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-16569705699&cx=c&gtm=4e64k0h2 — 200 — 144.4 KiB — 47 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.3 shttps://nngroup.com// https://nngroup.com/ — 301 — 947 B — 62 ms — h2https://www.nngroup.com/www.nngroup.com/ https://www.nngroup.com/ — 200 — 32.7 KiB — 44 ms — h2https://media.nngroup.com/static/bundles/consent.jsmedia.nngroup.com/static/bundles/co... https://media.nngroup.com/static/bundles/consent.js — 200 — 4.6 KiB — 30 ms — h2https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/script.jscdn-cookieyes.com/client_data/1a1cf... https://cdn-cookieyes.com/client_data/1a1cf80aa4378be78f10d807/script.js — 200 — 8.9 KiB — 70 ms — h2https://media.nngroup.com/static/css/output.e9c610b5facf.cssmedia.nngroup.com/static/css/output... https://media.nngroup.com/static/css/output.e9c610b5facf.css — 200 — 701 B — 25 ms — h2https://media.nngroup.com/static/css/output.8a2ac8cc91c7.cssmedia.nngroup.com/static/css/output... https://media.nngroup.com/static/css/output.8a2ac8cc91c7.css — 200 — 77.3 KiB — 34 ms — h2https://media.nngroup.com/media/courses/icons/CourseAI_for_Design_Workflows_0mcAr2s.svgmedia.nngroup.com/media/courses/ico... https://media.nngroup.com/media/courses/icons/CourseAI_for_Design_Workflows_0mcAr2s.svg — 200 — 1.6 KiB — 17 ms — h2https://media.nngroup.com/media/courses/icons/CourseUsability_Testing.svgmedia.nngroup.com/media/courses/ico... https://media.nngroup.com/media/courses/icons/CourseUsability_Testing.svg — 200 — 987 B — 16 ms — h2https://media.nngroup.com/media/images/SP_Thumbnails_12_ZXbCnxY.width-330.pngmedia.nngroup.com/media/images/SP_T... https://media.nngroup.com/media/images/SP_Thumbnails_12_ZXbCnxY.width-330.png — 200 — 84.9 KiB — 6 ms — h2https://media.nngroup.com/media/images/SP_Thumbnails_7_TA3lF90.width-330.pngmedia.nngroup.com/media/images/SP_T... https://media.nngroup.com/media/images/SP_Thumbnails_7_TA3lF90.width-330.png — 200 — 92.6 KiB — 7 ms — h2https://media.nngroup.com/static/img/logos/amazon-logo-home.svgmedia.nngroup.com/static/img/logos/... https://media.nngroup.com/static/img/logos/amazon-logo-home.svg — 200 — 33.9 KiB — 5 ms — h2https://media.nngroup.com/static/js/output.3e6a450e0b15.jsmedia.nngroup.com/static/js/output.... https://media.nngroup.com/static/js/output.3e6a450e0b15.js — 200 — 19.5 KiB — 3 ms — h2https://tools.luckyorange.com/core/lo.js?site-id=e5c040f4tools.luckyorange.com/core/lo.js?si... https://tools.luckyorange.com/core/lo.js?site-id=e5c040f4 — 200 — 14.3 KiB — 9 ms — h2https://media.nngroup.com/static/js/output.8221eeaec7a2.jsmedia.nngroup.com/static/js/output.... https://media.nngroup.com/static/js/output.8221eeaec7a2.js — 200 — 159.3 KiB — 7 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-THJDDHKwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-THJDDHK — 200 — 182.7 KiB — 172 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 73 ms — 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https://bat.bing.net/action/0?ti=343242980&tm=gtm002&Ver=2&mid=631e5cc8-8d77-459e-93d5-890636a69621&bo=3&pi=918639831&lg=en-US&sw=800&sh=600&sc=24&tl=Nielsen%20Norman%20Group%3A%20UX%20Training,%20Consulting,%20%26%20Research%20-%20NN%2FG&kw=Jakob%20Nielsen,%20Don%20Norman,%20Donald%20A.%20Norman,%20Bruce%20Tognazzini,%20Tog,%20usability%20consulting,%20usability%20consultant,%20UX%20consulting,%20UX%20consultant,%20usability%20training,%20user%20experience,%20user-centered%20design,%20UCD,%20human%20factors,%20Web%20guru,%20design%20gurus,%20process%20improvement,%20NNG,%20nngroup&p=https%3A%2F%2Fwww.nngroup.com%2F&r=&lt=445&evt=pageLoad&sv=2&asc=D&cdb=AQcR&rn=409157 — 204 — 346 B — 147 ms — h2https://www.googletagmanager.com/gtag/js?id=G-630S9ESVKM&cx=c&gtm=4e64k0h2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-630S9ESVKM&cx=c&gtm=4e64k0h2 — 200 — 172.5 KiB — 81 ms — h3https://media.nngroup.com/static/img/favicon.icomedia.nngroup.com/static/img/favico... https://media.nngroup.com/static/img/favicon.ico — 200 — 6.8 KiB — 4 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-630S9ESVKM&gtm=45je64k0h2v870379881z878072914za20gzb78072914zd78072914&_p=1776806805189&gcs=G100&gcd=13q3qPq2q5l1&npa=1&dma_cps=-&dma=1&gdid=dY2Q2ZW&are=1&cid=301741409.1776806807&frm=0&pscdl=denied&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266401~117512543~117884344~118463262&sid=1776806806&sct=1&seg=0&dl=https%3A%2F%2Fwww.nngroup.com%2F&dt=Nielsen%20Norman%20Group%3A%20UX%20Training%2C%20Consulting%2C%20%26%20Research%20-%20NN%2FG&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.content_group=Unknown&ep.content_author=null&ep.content_length=null&ep.content_topic=null&ep.content_pubdate=null&tfd=1600region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-630S9ESVKM&gtm=45je64k0h2v870379881z878072914za20gzb78072914zd78072914&_p=1776806805189&gcs=G100&gcd=13q3qPq2q5l1&npa=1&dma_cps=-&dma=1&gdid=dY2Q2ZW&are=1&cid=301741409.1776806807&frm=0&pscdl=denied&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266401~117512543~117884344~118463262&sid=1776806806&sct=1&seg=0&dl=https%3A%2F%2Fwww.nngroup.com%2F&dt=Nielsen%20Norman%20Group%3A%20UX%20Training%2C%20Consulting%2C%20%26%20Research%20-%20NN%2FG&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.content_group=Unknown&ep.content_author=null&ep.content_length=null&ep.content_topic=null&ep.content_pubdate=null&tfd=1600 — 204 — 549 B — 88 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 965ms · 547KB · €5/mo
Unattributable
Other
Costly
Execution 410ms
Transfer 0 KB
Monthly Cost €2/mo
www.nngroup.com
Other
Optional
Execution 194ms
Transfer 33 KB
Monthly Cost €1/mo
media.nngroup.com
Other
Optional
Execution 180ms
Transfer 159 KB
Unused 58%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 183 KB
Unused 33%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 173 KB
Unused 40%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • Unattributable adds 410ms and costs ~€2/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

Unattributable takes 410ms 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

58% of media.nngroup.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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