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https://decathlon.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
32
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.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

4.02 s

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

5.57 s

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

4.23 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.

15.01 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.

48.66 s

Page Load Progression

1.1 s
2.2 s
3.2 s
4.3 s
5.4 s
6.5 s
7.5 s
8.6 s
Checks
16
8 PASS 1 REVIEW 5 FIX
F
Page Weight Budget
Action
9.4 MB transferred, 426 requests
FIX
9.4 MB transferred, 426 requests
Critical::
Page weighs 17.1 MB (9.4 MB transferred)
Warning::
Images are 4.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.5 MB
Warning::
JavaScript is 2.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.9 MB
Info::
Fonts are 353 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 353 KB
Warning::
426 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.0 g CO2 per page load
9.4 MB / 2.4 MB budget
9.4 MB transferred
426 requests
2.0 g CO2 per page load
Images 4.5 MiB 48%
JavaScript 2.9 MiB 30%
Other 1.3 MiB 14%
Fonts 353.3 KiB 4%
Other 130.2 KiB 1%
CSS 113.7 KiB 1%
HTML 93.9 KiB 1%
Other 24.5 KiB 0%
Other 10.1 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

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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (9.4 MiB of 9.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
19941ms total JS execution
FIX
19941ms total JS execution
Warning::
https://www.decathlon.com/: 4707ms CPU time
Warning::
Unattributable: 2623ms CPU time
Warning::
https://cdn.dynamicyield.com/api/8773860/api_stati...: 1519ms CPU time
Warning::
https://cdn.rebuyengine.com/onsite/js/rebuy.js?sho...: 1340ms CPU time
Warning::
https://cdn.rebuyengine.com/onsite/js/global.js?bu...: 1027ms CPU time
Warning::
Third-party scripts: 19941ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Style & Layout 21% Other 18% Script Parsing & Compilation 8% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.decathlon.com/4707ms402ms56ms3rd
Unattributable2623ms212ms0ms3rd
https://cdn.dynamicyield.com/api/8773860/api_static.js1519ms506ms54ms3rd
https://cdn.rebuyengine.com/onsite/js/rebuy.js?shop=decathlon-usa.myshopify.com1340ms720ms604ms3rd
https://cdn.rebuyengine.com/onsite/js/global.js?build=17755949821027ms839ms97ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js873ms781ms11ms3rd
https://www.decathlon.com/cdn/wpm/b0e8c7c7aw41bd75a1p837d7fd4m8b145375m.js829ms487ms44ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NQJCP882N4581ms498ms75ms3rd
https://cdn.rebuyengine.com/onsite/js/vendor-jquery.js?id=f643b7c5754fea9c562c448ms67ms12ms3rd
https://assets.gorgias.chat/build/static/js/279.6ba6eb825556cdb4.js406ms364ms38ms3rd

Showing top 10 of 44 scripts

F
JS Bundles
Action
209 scripts, 778 KB unused
FIX
209 scripts, 778 KB unused
Warning::
https://cdn.rebuyengine.com/onsite/js/global.js?bu...: 111 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-MJW...: 105 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.rebuyengine.com/onsite/js/vendors.js?i...: 87 KB unused (96%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-MJW...: 64 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NQJC...: 62 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 778 KB
778 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.rebuyengine.com/onsite/js/global.js?build=1775594982221 KB111 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-MJWCF3J&cx=c&gtm=4e6470h2136 KB105 KB (77%)✓3rd
https://cdn.rebuyengine.com/onsite/js/vendors.js?id=ba81eedcc75447950e1491 KB87 KB (96%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-MJWCF3J136 KB64 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NQJCP882N4174 KB62 KB (36%)✓3rd
https://assets.gorgias.chat/build/static/js/279.6ba6eb825556cdb4.js93 KB46 KB (49%)✓3rd
https://static.returngo.ai/master.returngo.ai/returngo.min.js?shop=decathlon-usa.myshopify.com50 KB44 KB (89%)✓3rd
https://static.klaviyo.com/onsite/js/build-preview/commit-98747c9b1816a2f78e748cdc073a286a0296d9f7/Render.f778b94f6021eec68929.js52 KB37 KB (72%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB32 KB (34%)✓3rd
https://connect.facebook.net/en_US/fbevents.js95 KB32 KB (34%)✓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
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: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
post-check0
pre-check0
C
Image Optimization
Action
55 images, 0 KB saveable
REVIEW
55 images, 0 KB saveable
Warning::
https://cdn.shopify.com/s/files/1/1330/6287/files/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.shopify.com/s/files/1/1330/6287/files/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.shopify.com/s/files/1/1330/6287/files/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.shopify.com/s/files/1/1752/4727/files/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cdn.shopify.com/s/files/1/1752/4727/files/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
55 images 4.5 MB
0 oversized -0 KB
14 legacy format
5 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

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
9 fonts (353 KB)
PASS
9 fonts (353 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

353 KB total

Render-blocking

0

of 9

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 4.0 s LCP 5.6 shttps://www.decathlon.com/cdn/shop/t/334/assets/Decathlon-Brand-SemiBold.woff2?v=4101535601310826581750076865Decathlon-Brand-SemiBol... https://www.decathlon.com/cdn/shop/t/334/assets/Decathlon-Brand-SemiBold.woff2?v=4101535601310826581750076865 — 0 B — 0 ms — font-display: swaphttps://www.decathlon.com/cdn/shop/t/334/assets/Decathlon-Display-SemiBold.woff2?v=100345316253960588891750076865Decathlon-Display-SemiB... https://www.decathlon.com/cdn/shop/t/334/assets/Decathlon-Display-SemiBold.woff2?v=100345316253960588891750076865 — 0 B — 0 ms — font-display: swaphttps://www.decathlon.com/cdn/shop/t/334/assets/Decathlon-Text-Medium.woff2?v=52324173899180483681750076865Decathlon-Text-Medium.w... https://www.decathlon.com/cdn/shop/t/334/assets/Decathlon-Text-Medium.woff2?v=52324173899180483681750076865 — 0 B — 0 ms — font-display: swaphttps://www.decathlon.com/cdn/shop/t/334/assets/Decathlon-Text-SemiBold.woff2?v=2220433650020876521750076866Decathlon-Text-SemiBold... https://www.decathlon.com/cdn/shop/t/334/assets/Decathlon-Text-SemiBold.woff2?v=2220433650020876521750076866 — 0 B — 0 ms — font-display: swaphttps://www.decathlon.com/cdn/fonts/assistant/assistant_n4.9120912a469cad1cc292572851508ca49d12e768.woff2assistant_n4.9120912a46... https://www.decathlon.com/cdn/fonts/assistant/assistant_n4.9120912a469cad1cc292572851508ca49d12e768.woff2 — 12.9 KiB — 0 ms — font-display: swaphttps://cdn.rebuyengine.com/onsite/webfonts/fa-light-300.woff2fa-light-300.woff2 https://cdn.rebuyengine.com/onsite/webfonts/fa-light-300.woff2 — 185.8 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/1330/6287/files/Decathlon-Display-Bold.ttf?v=1759350281Decathlon-Display-Bold.ttf https://cdn.shopify.com/s/files/1/1330/6287/files/Decathlon-Display-Bold.ttf?v=1759350281 — 51.5 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/1330/6287/files/Decathlon-Display-SemiBold.ttf?v=1759350281Decathlon-Display-SemiB... https://cdn.shopify.com/s/files/1/1330/6287/files/Decathlon-Display-SemiBold.ttf?v=1759350281 — 51.5 KiB — 0 ms — font-display: swaphttps://cdn.shopify.com/s/files/1/1330/6287/files/Decathlon-Display-Medium.ttf?v=1759350281Decathlon-Display-Mediu... https://cdn.shopify.com/s/files/1/1330/6287/files/Decathlon-Display-Medium.ttf?v=1759350281 — 51.5 KiB — 0 ms — font-display: swap
Decathlon-Brand-SemiBol... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Decathlon-Display-SemiB... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Decathlon-Text-Medium.w... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Decathlon-Text-SemiBold... woff2 swap
Size 0 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
assistant_n4.9120912a46... woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
fa-light-300.woff2 woff2 swap
Size 186 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
Decathlon-Display-Bold.ttf ttf swap
Size 51 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Decathlon-Display-SemiB... ttf swap
Size 52 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Decathlon-Display-Mediu... ttf swap
Size 51 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~139 KB and ~278 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
25 hints, 0 missing preconnects
PASS
25 hints, 0 missing preconnects
Info::
Page uses 25 resource hint(s)

Current Resource Hints

preconnect
8
preload
6
dns-prefetch
4
prefetch
7

25 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
426 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 19941ms · 1946KB · €106/mo
www.decathlon.com
Other
Costly
Execution 4707ms
Transfer 80 KB
Monthly Cost €25/mo
Unattributable
Other
Costly
Execution 2623ms
Transfer 0 KB
Monthly Cost €14/mo
cdn.dynamicyield.com
Other
Costly
Execution 1519ms
Transfer 112 KB
Monthly Cost €8/mo
cdn.rebuyengine.com
Other
Costly
Execution 1340ms
Transfer 21 KB
Monthly Cost €7/mo
cdn.rebuyengine.com
Other
Costly
Execution 1027ms
Transfer 221 KB
Unused 51%
Monthly Cost €5/mo
Microsoft Clarity
Session Replay
Costly
Execution 873ms
Transfer 26 KB
Monthly Cost €5/mo
www.decathlon.com
Other
Costly
Execution 829ms
Transfer 61 KB
Unused 38%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 581ms
Transfer 174 KB
Unused 36%
Monthly Cost €3/mo
cdn.rebuyengine.com
Other
Costly
Execution 448ms
Transfer 32 KB
Unused 71%
Monthly Cost €2/mo
assets.gorgias.chat
Other
Costly
Execution 406ms
Transfer 93 KB
Unused 49%
Monthly Cost €2/mo
static.klaviyo.com
Other
Costly
Execution 383ms
Transfer 23 KB
Monthly Cost €2/mo
static.klaviyo.com
Other
Costly
Execution 334ms
Transfer 10 KB
Monthly Cost €2/mo
static.klaviyo.com
Other
Costly
Execution 323ms
Transfer 8 KB
Monthly Cost €2/mo
st.dynamicyield.com
Other
Costly
Execution 313ms
Transfer 5 KB
Monthly Cost €2/mo
cdn.rebuyengine.com
Other
Costly
Execution 312ms
Transfer 1 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 297ms
Transfer 136 KB
Unused 47%
Monthly Cost €2/mo
assets.gorgias.chat
Other
Costly
Execution 294ms
Transfer 38 KB
Unused 67%
Monthly Cost €2/mo
www.decathlon.com
Other
Costly
Execution 245ms
Transfer 28 KB
Monthly Cost €1/mo
www.decathlon.com
Other
Costly
Execution 234ms
Transfer 21 KB
Monthly Cost €1/mo
static.klaviyo.com
Other
Costly
Execution 234ms
Transfer 7 KB
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 185ms
Transfer 95 KB
Unused 34%
Monthly Cost €1/mo
static.klaviyo.com
Other
Optional
Execution 177ms
Transfer 52 KB
Unused 72%
Monthly Cost €1/mo
cdn.rebuyengine.com
Other
Optional
Execution 173ms
Transfer 91 KB
Unused 96%
Monthly Cost €1/mo
size-guides-prod.esc-apps-cdn.com
Other
Optional
Execution 173ms
Transfer 49 KB
Monthly Cost €1/mo
www.decathlon.com
Other
Optional
Execution 147ms
Transfer 4 KB
Monthly Cost €1/mo
Facebook Pixel
Advertising
Optional
Execution 145ms
Transfer 39 KB
Monthly Cost €1/mo
cdn.nfcube.com
Other
Optional
Execution 132ms
Transfer 20 KB
Monthly Cost €1/mo
www.decathlon.com
Other
Optional
Execution 129ms
Transfer 31 KB
Monthly Cost €1/mo
cdn.9gtb.com
Other
Optional
Execution 126ms
Transfer 60 KB
Unused 54%
Monthly Cost €1/mo
cdn.shopify.com
Other
Optional
Execution 100ms
Transfer 7 KB
Monthly Cost €1/mo
cdn.dynamicyield.com
Other
Optional
Execution 100ms
Transfer 18 KB
Monthly Cost €1/mo
cdn.aggle.net
Other
Optional
Execution 94ms
Transfer 19 KB
Monthly Cost €0/mo
www.decathlon.com
Other
Optional
Execution 91ms
Transfer 4 KB
Monthly Cost €0/mo
na.shgcdn3.com
Other
Optional
Execution 89ms
Transfer 27 KB
Monthly Cost €0/mo
cdn.nfcube.com
Other
Optional
Execution 86ms
Transfer 20 KB
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 85ms
Transfer 136 KB
Unused 77%
Monthly Cost €0/mo
www.decathlon.com
Other
Optional
Execution 85ms
Transfer 9 KB
Monthly Cost €0/mo
cdn-app.cart-bot.net
Other
Optional
Execution 84ms
Transfer 37 KB
Monthly Cost €0/mo
www.decathlon.com
Other
Optional
Execution 79ms
Transfer 23 KB
Monthly Cost €0/mo
cdn.rebuyengine.com
Other
Optional
Execution 77ms
Transfer 15 KB
Monthly Cost €0/mo
cdn.shopify.com
Other
Optional
Execution 76ms
Transfer 39 KB
Unused 78%
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 68ms
Transfer 19 KB
Monthly Cost €0/mo
light.spicegems.org
Other
Optional
Execution 59ms
Transfer 33 KB
Monthly Cost €0/mo
static.klaviyo.com
Other
Optional
Execution 56ms
Transfer 3 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.decathlon.com adds 4707ms and costs ~€25/month
  • Unattributable adds 2623ms and costs ~€14/month
  • cdn.dynamicyield.com adds 1519ms and costs ~€8/month
  • cdn.rebuyengine.com adds 1340ms and costs ~€7/month
  • cdn.rebuyengine.com adds 1027ms and costs ~€5/month
  • Microsoft Clarity adds 873ms and costs ~€5/month
  • www.decathlon.com adds 829ms and costs ~€4/month
  • Google Tag Manager adds 581ms and costs ~€3/month
  • cdn.rebuyengine.com adds 448ms and costs ~€2/month
  • assets.gorgias.chat adds 406ms and costs ~€2/month
  • static.klaviyo.com adds 383ms and costs ~€2/month
  • static.klaviyo.com adds 334ms and costs ~€2/month
  • static.klaviyo.com adds 323ms and costs ~€2/month
  • st.dynamicyield.com adds 313ms and costs ~€2/month
  • cdn.rebuyengine.com adds 312ms and costs ~€2/month
  • Google Tag Manager adds 297ms and costs ~€2/month
  • assets.gorgias.chat adds 294ms and costs ~€2/month
  • www.decathlon.com adds 245ms and costs ~€1/month
  • www.decathlon.com adds 234ms and costs ~€1/month
  • static.klaviyo.com adds 234ms and costs ~€1/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

www.decathlon.com takes 4707ms 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 2623ms 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

cdn.dynamicyield.com takes 1519ms 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

cdn.rebuyengine.com takes 1340ms 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

cdn.rebuyengine.com takes 1027ms 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

51% of cdn.rebuyengine.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

Microsoft Clarity takes 873ms 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

www.decathlon.com takes 829ms 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 581ms 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

cdn.rebuyengine.com takes 448ms 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

71% of cdn.rebuyengine.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

assets.gorgias.chat takes 406ms 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.klaviyo.com takes 383ms 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.klaviyo.com 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

static.klaviyo.com takes 323ms 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

st.dynamicyield.com takes 313ms 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

cdn.rebuyengine.com takes 312ms 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 297ms 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

assets.gorgias.chat takes 294ms 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

67% of assets.gorgias.chat'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.decathlon.com takes 245ms 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

www.decathlon.com takes 234ms 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.klaviyo.com takes 234ms 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

72% of static.klaviyo.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 cdn.rebuyengine.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

54% of cdn.9gtb.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

77% 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

78% of cdn.shopify.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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