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https://www.nike.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
65
GRADE
D
FIX
4
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
38
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

1.01 s

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

4.65 s

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

1.01 s

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

0.002

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

5.13 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.

8.71 s

Page Load Progression

1.2 s
2.4 s
3.7 s
4.9 s
6.1 s
7.3 s
8.5 s
9.8 s
Checks
14
6 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
20.2 MB transferred, 296 requests
FIX
20.2 MB transferred, 296 requests
Critical::
Page weighs 46.2 MB (20.2 MB transferred)
Warning::
JavaScript is 3.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.9 MB
Info::
Fonts are 212 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 212 KB
Warning::
296 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 4.2 g CO2 per page load
20.2 MB / 2.4 MB budget
20.2 MB transferred
296 requests
4.2 g CO2 per page load
Other 14.9 MiB 74%
JavaScript 3.9 MiB 19%
Images 853.5 KiB 4%
Fonts 211.9 KiB 1%
HTML 160.8 KiB 1%
CSS 157.9 KiB 1%
Other 36.3 KiB 0%
Other 17.8 KiB 0%
Other 3.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Why this matters

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

Source: web.dev

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

Why this matters

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

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
90% third-party, 0 ms blocking
FIX
90% third-party, 0 ms blocking
Warning::
Third-party code accounts for 90% of page weight (18.1 MiB of 20.2 MiB)
Info::
Third-party blocking time is low (0 ms)
90%
First-party Third-party
F
JS Execution Cost
Action
6297ms total JS execution
FIX
6297ms total JS execution
Warning::
Unattributable: 1046ms CPU time
Warning::
https://www.nike.com/: 986ms CPU time
Warning::
https://www.nike.com/assets/vendor/react/18.3.1/re...: 964ms CPU time
Warning::
https://www.nike.com/149e9513-01fa-4fb0-aad4-566af...: 922ms CPU time
Warning::
https://static-assets.nike.com/video-player/2.2.0/...: 415ms CPU time
Info::
Third-party scripts: 2431ms (39% of total)

Main Thread Breakdown

Script Evaluation 63% Other 19% Script Parsing & Compilation 6% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
Unattributable1046ms289ms0ms3rd
https://www.nike.com/986ms342ms26ms1st
https://www.nike.com/assets/vendor/react/18.3.1/react.production.min.js964ms861ms0ms1st
https://www.nike.com/149e9513-01fa-4fb0-aad4-566afd725d1b/2d206a39-8ed7-437e-a3be-862e0f06eea3/ips.js?KP_UIDz=0YR39A4eUfHL1vmCdwPqOCZN3Axnp0FNNNaEE6aiHW6yNykFmw1PgxckQ8nTcQszErg3HNa7O5A7JvjY6HZ0seTfk14NnDnUoE0atpjW9NsJA0sUV9QNsTK5eXCkTkble1OiQDdxSC30RuiHOVv6Q9LpIYiUfY6V3K3n4fxqAO9RMWmw&x-kpsdk-v=j-1.2.308&x-kpsdk-im=AALV7ybq0ktZgQZ4rFqv4xL-zOKGeVkkBdBES6cBt2_DZ3vIBejQ_VlXhPpcDAVHYrACfG8Dul4FG-xZ5uHZ6272pKk922ms862ms17ms1st
https://static-assets.nike.com/video-player/2.2.0/nike-one-video-player.min.js415ms134ms24ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NTF2X45&l=marketingClientDataLayer315ms270ms23ms3rd
https://www.nike.com/_next/static/chunks/739.e084fb5e3f935e6a.js284ms49ms1ms1st
https://www.nike.com/static/analytics-client/public/config.chunk.0a0e99.js198ms186ms1ms1st
https://www.nike.com/149e9513-01fa-4fb0-aad4-566afd725d1b/2d206a39-8ed7-437e-a3be-862e0f06eea3/p.js154ms91ms4ms1st
https://js-agent.newrelic.com/nr-spa-1.312.1.min.js121ms91ms5ms3rd

Showing top 10 of 21 scripts

F
JS Bundles
Action
133 scripts, 928 KB unused
FIX
133 scripts, 928 KB unused
Warning::
https://static-assets.nike.com/video-player/2.2.0/...: 84 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QTVT...: 64 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 60 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-417...: 60 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://analytics.tiktok.com/i18n/pixel/static/mai...: 60 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 928 KB
928 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static-assets.nike.com/video-player/2.2.0/nike-one-video-player.min.js191 KB84 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-QTVTHYLBQS&l=marketingClientDataLayer&cx=c&gtm=4e6411169 KB64 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-1019013699&l=marketingClientDataLayer&cx=c&gtm=4e6411144 KB60 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-4171764&l=marketingClientDataLayer129 KB60 KB (47%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js106 KB60 KB (57%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-947143981&l=marketingClientDataLayer&cx=c&gtm=4e6411132 KB59 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-8128335&l=marketingClientDataLayer&cx=c&gtm=4e6411128 KB59 KB (46%)✓3rd
https://www.nike.com/static/bellotti/playcard/_reco/public/c636b1d17225aef30e14/index.umd.js77 KB56 KB (74%)✓1st
https://www.nike.com/static/cssf/async-chat/_reco/public/0237b8daa38595b79c21/index.umd.js89 KB54 KB (62%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-NTF2X45&l=marketingClientDataLayer179 KB51 KB (29%)✓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

C
Image Optimization
Action
40 images, 0 KB saveable
REVIEW
40 images, 0 KB saveable
Warning::
https://static.nike.com/a/images/w_144,c_limit/9ef... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/77b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/cc5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/5e4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/253... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/5c2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/9fe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/49c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/3ae... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_960,c_limit/373... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/086... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/164... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/f65... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/9b3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/676... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/89d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.nike.com/a/images/w_144,c_limit/983... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
40 images 854 KB
0 oversized -0 KB
30 legacy format
17 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

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

C
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
5 fonts (212 KB)
PASS
5 fonts (212 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

212 KB total

Render-blocking

0

of 5

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 FCP 1.0 s LCP 4.7 shttps://www.nike.com/static/ncss/5.0/dotcom/fonts/Nike-Futura.woff2Nike-Futura.woff2 https://www.nike.com/static/ncss/5.0/dotcom/fonts/Nike-Futura.woff2 — 24.9 KiB — 0 ms — font-display: swaphttps://www.nike.com/static/ncss/5.0/dotcom/fonts/HelveticaNowTextMedium.woff2HelveticaNowTextMedium.... https://www.nike.com/static/ncss/5.0/dotcom/fonts/HelveticaNowTextMedium.woff2 — 50.5 KiB — 0 ms — font-display: swaphttps://www.nike.com/static/ncss/5.0/dotcom/fonts/HelveticaNowText.woff2HelveticaNowText.woff2 https://www.nike.com/static/ncss/5.0/dotcom/fonts/HelveticaNowText.woff2 — 47.7 KiB — 0 ms — font-display: swaphttps://www.nike.com/static/ncss/5.0/dotcom/fonts/Nike-Futura-ot-300.woff2Nike-Futura-ot-300.woff2 https://www.nike.com/static/ncss/5.0/dotcom/fonts/Nike-Futura-ot-300.woff2 — 29.1 KiB — 0 ms — font-display: swaphttps://www.nike.com/static/ncss/5.0/dotcom/fonts/HelveticaNowDisplayMedium.woff2HelveticaNowDisplayMedi... https://www.nike.com/static/ncss/5.0/dotcom/fonts/HelveticaNowDisplayMedium.woff2 — 59.7 KiB — 0 ms — font-display: swap
Nike-Futura.woff2 woff2 swap
Size 25 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
HelveticaNowTextMedium.... woff2 swap
Size 51 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
HelveticaNowText.woff2 woff2 swap
Size 48 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Nike-Futura-ot-300.woff2 woff2 swap
Size 29 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
HelveticaNowDisplayMedi... woff2 swap
Size 60 KB
Load time 0 ms
Start 0 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
A+
HTTP Caching
max-age=822 (13 minutes)
PASS
max-age=822 (13 minutes)
Info::
Cache-Control header is set
Got: max-age=822
Info::
Effective TTL: 13 minutes (max-age=822)
Info::
ETag present — enables conditional (304) responses
Cache-Control

max-age=822

DirectiveValueMeaning
max-age822Cache for 13 minutes
Effective TTL: 822 seconds
Network Waterfall
296 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
39% of JavaScript execution is third-party
First-party Third-party 2431ms · 1174KB · $14/mo
Unattributable
Other
Costly
Execution 1046ms
Transfer 0 KB
Monthly Cost $6/mo
static-assets.nike.com
Other
Costly
Execution 415ms
Transfer 191 KB
Unused 45%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 315ms
Transfer 179 KB
Unused 29%
Monthly Cost $2/mo
js-agent.newrelic.com
Other
Optional
Execution 121ms
Transfer 30 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 119ms
Transfer 169 KB
Unused 38%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 102ms
Transfer 132 KB
Unused 45%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 96ms
Transfer 144 KB
Unused 42%
Monthly Cost $1/mo
analytics.tiktok.com
Other
Optional
Execution 84ms
Transfer 106 KB
Unused 57%
Monthly Cost $0/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 128 KB
Unused 46%
Monthly Cost $0/mo
Facebook Pixel
Advertising
Optional
Execution 51ms
Transfer 95 KB
Unused 39%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 1046ms and costs ~$6/month
  • static-assets.nike.com adds 415ms and costs ~$2/month
  • Google Tag Manager adds 315ms and costs ~$2/month

Unattributable takes 1046ms 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

static-assets.nike.com takes 415ms 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 315ms 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

57% of analytics.tiktok.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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