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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
27
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.

6.10 s

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

23.43 s

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

2.32 s

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

0.000

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

11.12 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.

24.04 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
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.8 MB transferred, 93 requests
FIX
3.8 MB transferred, 93 requests
Warning::
Page weighs 11.7 MB (3.8 MB transferred)
Warning::
JavaScript is 2.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.5 MB
Info::
Fonts are 522 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 522 KB
Info::
93 HTTP requests
Info::
Estimated 0.81 g CO2 per page load
3.8 MB / 2.4 MB budget
3.8 MB transferred
93 requests
0.81 g CO2 per page load
JavaScript 2.5 MiB 65%
Fonts 522.5 KiB 13%
Images 401.7 KiB 10%
HTML 321.5 KiB 8%
CSS 78.4 KiB 2%
Other 32.1 KiB 1%
Other 12.3 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

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

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 (3.8 MiB of 3.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6139ms total JS execution
FIX
6139ms total JS execution
Warning::
https://eu.puma.com/tmsassets?id=GTM-WH5C8CGQ: 1634ms CPU time
Warning::
https://eu.puma.com/on/demandware.static/Sites-EU-...: 1547ms CPU time
Warning::
Unattributable: 760ms CPU time
Warning::
https://eu.puma.com/fr/fr/home: 565ms CPU time
Warning::
https://try.abtasty.com/155ee0f00a8630aa35b7283533...: 325ms CPU time
Warning::
Third-party scripts: 6139ms (100% of total)

Main Thread Breakdown

Script Evaluation 60% Script Parsing & Compilation 14% Other 13% Style & Layout 7% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://eu.puma.com/tmsassets?id=GTM-WH5C8CGQ1634ms1464ms58ms3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/main.js1547ms975ms458ms3rd
Unattributable760ms92ms0ms3rd
https://eu.puma.com/fr/fr/home565ms54ms39ms3rd
https://try.abtasty.com/155ee0f00a8630aa35b7283533eee8cf/main.d359a4d2876eac316a74.js325ms264ms52ms3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js250ms85ms49ms3rd
https://eu.puma.com/tmsassets/gtd?id=G-Z9W7F41DQW&cx=c&gtm=4e6460h1195ms148ms46ms3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/webcomp/cookielocation.js155ms141ms2ms3rd
https://try.abtasty.com/shared/analytics.37a0db73c875fc20a037.js123ms65ms2ms3rd
https://static.scarabresearch.com/wpjs/wpes6.js?ts=2935121ms91ms13ms3rd

Showing top 10 of 17 scripts

F
JS Bundles
Action
38 scripts, 1.7 MB unused
FIX
38 scripts, 1.7 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://cdn.cookielaw.org/scripttemplates/202601.2...: 78 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.puma.com/tmsassets?id=GTM-WH5C8CGQ: 77 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.puma.com/tmsassets/gtd?id=G-Z9W7F41DQW&...: 73 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu.puma.com/tmsassets?id=GTM-TSWKBGX3: 66 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.7 MB
1714 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 KB1226 KB (96%)✗3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js128 KB78 KB (61%)✓3rd
https://eu.puma.com/tmsassets?id=GTM-WH5C8CGQ187 KB77 KB (41%)✓3rd
https://eu.puma.com/tmsassets/gtd?id=G-Z9W7F41DQW&cx=c&gtm=4e6460h1179 KB73 KB (41%)✓3rd
https://eu.puma.com/tmsassets?id=GTM-TSWKBGX3141 KB66 KB (47%)✓3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/global.bundle.js72 KB64 KB (89%)✓3rd
https://try.abtasty.com/155ee0f00a8630aa35b7283533eee8cf/main.d359a4d2876eac316a74.js83 KB49 KB (59%)✓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 (61%)✓3rd
https://eu.puma.com/on/demandware.static/Sites-EU-Site/-/fr_FR/v1775546087502/js/vendors~pdp.bundle.js22 KB22 KB (97%)✓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
23 images, 0 KB saveable
REVIEW
23 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://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/f_auto,q_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://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://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.
23 images 402 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
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 (522 KB)
PASS
5 fonts (522 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

522 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s FCP 6.1 s LCP 23.4 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 — 18.4 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 — 17.3 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 — 18.4 KiB — 0 ms — font-display: swapdata:font/ttf;base64,AAEAAAASAQAABAAgRkZUTYbNbpAAA65QAAAAHEdERUYqKTAzAAJ8AAAAAE5HUE9TSa0aWAACoRQAAQ…ttf;base64,AAEAAAASAQAA... data:font/ttf;base64,AAEAAAASAQAABAAgRkZUTYbNbpAAA65QAAAAHEdERUYqKTAzAAJ8AAAAAE5HUE9TSa0aWAACoRQAAQ… — 235.6 KiB — 0 ms — font-display: swapdata:font/ttf;base64,AAEAAAASAQAABAAgRkZUTYbNbPUAA6MAAAAAHEdERUYqKTAzAAJ19AAAAE5HUE9TxrYN6wACmwgAAQ…ttf;base64,AAEAAAASAQAA... data:font/ttf;base64,AAEAAAASAQAABAAgRkZUTYbNbPUAA6MAAAAAHEdERUYqKTAzAAJ19AAAAE5HUE9TxrYN6wACmwgAAQ… — 232.8 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
ttf;base64,AAEAAAASAQAA... unknown swap
Size 236 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
ttf;base64,AAEAAAASAQAA... unknown swap
Size 233 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)

Fixing the unchecked items could save ~375 KB and ~750 ms

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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
3
preload
1
dns-prefetch
1
prefetch
—

5 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
93 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 6139ms · 2486KB · €33/mo
eu.puma.com
Other
Costly
Execution 1634ms
Transfer 187 KB
Unused 41%
Monthly Cost €9/mo
eu.puma.com
Other
Costly
Execution 1547ms
Transfer 1300 KB
Unused 96%
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 760ms
Transfer 0 KB
Monthly Cost €4/mo
eu.puma.com
Other
Costly
Execution 565ms
Transfer 87 KB
Monthly Cost €3/mo
try.abtasty.com
Other
Costly
Execution 325ms
Transfer 83 KB
Unused 59%
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 250ms
Transfer 128 KB
Unused 61%
Monthly Cost €1/mo
eu.puma.com
Other
Optional
Execution 195ms
Transfer 179 KB
Unused 41%
Monthly Cost €1/mo
eu.puma.com
Other
Optional
Execution 155ms
Transfer 154 KB
Monthly Cost €1/mo
try.abtasty.com
Other
Optional
Execution 123ms
Transfer 8 KB
Monthly Cost €1/mo
static.scarabresearch.com
Other
Optional
Execution 121ms
Transfer 34 KB
Monthly Cost €1/mo
cdn.cquotient.com
Other
Optional
Execution 86ms
Transfer 21 KB
Monthly Cost €0/mo
eu.puma.com
Other
Optional
Execution 79ms
Transfer 72 KB
Unused 89%
Monthly Cost €0/mo
eu.puma.com
Other
Optional
Execution 73ms
Transfer 9 KB
Monthly Cost €0/mo
eu.puma.com
Other
Optional
Execution 60ms
Transfer 34 KB
Unused 96%
Monthly Cost €0/mo
eu.puma.com
Other
Optional
Execution 58ms
Transfer 46 KB
Unused 61%
Monthly Cost €0/mo
cdn.portal-backend.prod.qualibooth.com
Other
Optional
Execution 56ms
Transfer 2 KB
Monthly Cost €0/mo
eu.puma.com
Other
Optional
Execution 53ms
Transfer 141 KB
Unused 47%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • eu.puma.com adds 1634ms and costs ~€9/month
  • eu.puma.com adds 1547ms and costs ~€8/month
  • Unattributable adds 760ms and costs ~€4/month
  • eu.puma.com adds 565ms and costs ~€3/month
  • try.abtasty.com adds 325ms 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 1634ms 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 1547ms 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

Unattributable takes 760ms 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 565ms 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

try.abtasty.com takes 325ms 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

59% 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

61% 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

89% 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

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

61% 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

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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