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https://www.puma.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
4
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
69
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.

1.01 s

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

2.01 s

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

366 ms

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

0.067

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

1.89 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.

3.96 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
14
5 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 81 requests
FIX
3.1 MB transferred, 81 requests
Warning::
Page weighs 10.0 MB (3.1 MB transferred)
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Info::
81 HTTP requests
Info::
Estimated 0.64 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
81 requests
0.64 g CO2 per page load
JavaScript 2.4 MiB 77%
Images 479.1 KiB 15%
HTML 86.8 KiB 3%
CSS 78.6 KiB 3%
Fonts 54.1 KiB 2%
Other 6.4 KiB 0%
Other 2.1 KiB 0%
Other 1.2 KiB 0%
Other 666 B 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

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
37 scripts, 1.6 MB unused
FIX
37 scripts, 1.6 MB unused
Warning::
https://eu.puma.com/on/demandware.static/Sites-EU-...: 1.2 MB unused (96%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.puma.com/on/demandware.static/Sites-EU-...: unminified — 203 KB could be saved
Warning::
https://eu.puma.com/tmsassets?id=GTM-WH5C8CGQ: 79 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.puma.com/tmsassets/?id=G-Z9W7F41DQW&cx=...: 73 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.puma.com/on/demandware.static/Sites-EU-...: 64 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.puma.com/tmsassets?id=GTM-TSWKBGX3: 64 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.6 MB
1637 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/main.js1300 KB1227 KB (96%)✗3rd
https://eu.puma.com/tmsassets?id=GTM-WH5C8CGQ187 KB79 KB (42%)✓3rd
https://eu.puma.com/tmsassets/?id=G-Z9W7F41DQW&cx=c&gtm=4e6460179 KB73 KB (41%)✓3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/global.bundle.js72 KB64 KB (89%)✓3rd
https://eu.puma.com/tmsassets?id=GTM-TSWKBGX3141 KB64 KB (45%)✓3rd
https://try.abtasty.com/155ee0f00a8630aa35b7283533eee8cf/main.d359a4d2876eac316a74.js83 KB48 KB (58%)✓3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/pdp.bundle.js34 KB33 KB (96%)✓3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/common-vendors.bundle.js46 KB28 KB (60%)✓3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/vendors~pdp.bundle.js22 KB22 KB (97%)✓3rd
https://try.abtasty.com/shared/commons.d69b79abf8e487019841.js4 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
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
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://eu.puma.com/on/demandware.static/Sites-EU-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.puma.com/image/upload/q_auto,f_auto... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.puma.com/image/upload/q_auto,f_auto... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://eu.puma.com/on/demandware.static/-/Library... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://eu.puma.com/on/demandware.static/-/Library... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.puma.com/image/upload/q_auto,f_auto... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://images.puma.com/image/upload/f_auto,q_auto... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 479 KB
0 oversized -0 KB
9 legacy format
7 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

C
JS Execution Cost
Action
1759ms total JS execution
REVIEW
1759ms total JS execution
Warning::
https://eu.puma.com/fr/fr/home: 457ms CPU time
Warning::
https://eu.puma.com/on/demandware.static/Sites-EU-...: 432ms CPU time
Warning::
https://eu.puma.com/tmsassets?id=GTM-TSWKBGX3: 300ms CPU time
Warning::
Unattributable: 296ms CPU time
Info::
https://try.abtasty.com/155ee0f00a8630aa35b7283533...: 171ms CPU time
Warning::
Third-party scripts: 1759ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 16% Style & Layout 13% Script Parsing & Compilation 13% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://eu.puma.com/fr/fr/home457ms22ms6ms3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/main.js432ms272ms138ms3rd
https://eu.puma.com/tmsassets?id=GTM-TSWKBGX3300ms276ms13ms3rd
Unattributable296ms49ms0ms3rd
https://try.abtasty.com/155ee0f00a8630aa35b7283533eee8cf/main.d359a4d2876eac316a74.js171ms132ms31ms3rd
https://eu.puma.com/tmsassets/?id=G-Z9W7F41DQW&cx=c&gtm=4e6460102ms74ms13ms3rd
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 (54 KB)
PASS
3 fonts (54 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

54 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 1.0 s LCP 2.0 shttps://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/fonts/FFDINforPumaW01-Regular.woff2FFDINforPumaW01-Regular... https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/fonts/FFDINforPumaW01-Regular.woff2 — 18.3 KiB — 0 ms — font-display: swaphttps://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/fonts/FFDINforPumaW01-Medium.woff2FFDINforPumaW01-Medium.... https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/fonts/FFDINforPumaW01-Medium.woff2 — 17.4 KiB — 0 ms — font-display: swaphttps://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/fonts/FFDINforPumaW01-Bold.woff2FFDINforPumaW01-Bold.woff2 https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/fonts/FFDINforPumaW01-Bold.woff2 — 18.3 KiB — 0 ms — font-display: swap
FFDINforPumaW01-Regular... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
FFDINforPumaW01-Medium.... woff2 swap
Size 17 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
FFDINforPumaW01-Bold.woff2 woff2 swap
Size 18 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
Network Waterfall
81 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
100% of JavaScript execution is third-party
First-party Third-party 1759ms · 1790KB · €9/mo
eu.puma.com
Other
Costly
Execution 457ms
Transfer 87 KB
Monthly Cost €2/mo
eu.puma.com
Other
Costly
Execution 432ms
Transfer 1300 KB
Unused 96%
Monthly Cost €2/mo
eu.puma.com
Other
Costly
Execution 300ms
Transfer 141 KB
Unused 45%
Monthly Cost €2/mo
Unattributable
Other
Costly
Execution 296ms
Transfer 0 KB
Monthly Cost €2/mo
try.abtasty.com
Other
Optional
Execution 171ms
Transfer 83 KB
Unused 58%
Monthly Cost €1/mo
eu.puma.com
Other
Optional
Execution 102ms
Transfer 179 KB
Unused 41%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • eu.puma.com adds 457ms and costs ~€2/month
  • eu.puma.com adds 432ms and costs ~€2/month
  • eu.puma.com adds 300ms and costs ~€2/month
  • Unattributable adds 296ms 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

eu.puma.com takes 457ms 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

eu.puma.com takes 432ms 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

96% of eu.puma.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

eu.puma.com takes 300ms 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 296ms 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 try.abtasty.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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