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https://www.ikea.fr

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
90
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

839 ms

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

1.46 s

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

20 ms

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.

2.10 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.

3.54 s

Page Load Progression

2.1 s
4.3 s
6.4 s
8.5 s
10.6 s
12.8 s
14.9 s
17.0 s
Checks
14
6 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
4.2 MB transferred, 347 requests
FIX
4.2 MB transferred, 347 requests
Critical::
Page weighs 8.6 MB (4.2 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
CSS is 224 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 224 KB
Warning::
347 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.88 g CO2 per page load
4.2 MB / 2.4 MB budget
4.2 MB transferred
347 requests
0.88 g CO2 per page load
Other 1.4 MiB 32%
JavaScript 1.2 MiB 28%
Images 915.7 KiB 21%
Other 281.2 KiB 7%
CSS 224.0 KiB 5%
HTML 175.8 KiB 4%
Other 90.8 KiB 2%
Fonts 23.2 KiB 1%
Other 3.4 KiB 0%
Other 2.4 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

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 (4.2 MiB of 4.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6960ms total JS execution
FIX
6960ms total JS execution
Warning::
https://www.ikea.com/fr/fr/: 4549ms CPU time
Warning::
Unattributable: 885ms CPU time
Info::
https://www.ikea.com/global/assets/dwf/hri/carouse...: 247ms CPU time
Info::
https://www.ikea.com/global/assets/dwf/listing/sha...: 225ms CPU time
Info::
https://www.ikea.com/global/assets/dwf/listing/Pro...: 181ms CPU time
Warning::
Third-party scripts: 6960ms (100% of total)

Main Thread Breakdown

Other 44% Script Evaluation 19% Style & Layout 18% Rendering 15%
ScriptTotalScriptingParse/CompileParty
https://www.ikea.com/fr/fr/4549ms65ms4ms3rd
Unattributable885ms151ms0ms3rd
https://www.ikea.com/global/assets/dwf/hri/carousel-D9mNGgU-.js247ms164ms0ms3rd
https://www.ikea.com/global/assets/dwf/listing/sharedComponents-D0hzjLxn.js225ms123ms0ms3rd
https://www.ikea.com/global/assets/dwf/listing/ProductCardContainer-EQYf3ODv.js181ms128ms0ms3rd
https://www.ikea.com/fr/fr/user-generated-content/rr-pip/app/rr-pip.d407618c.bundle.js160ms41ms1ms3rd
https://www.ikea.com/fr/fr/cookieconsent/scripts/cookieconsent-onetrust-js.js?v=mkpkr50w157ms140ms0ms3rd
https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js150ms81ms34ms3rd
https://www.ikea.com/global/assets/dwf/hri/hooks.module-DOV_Rl57.js127ms52ms0ms3rd
https://www.ikea.com/global/assets/dwf/hri/use-track-viewed-CazyHcWr.js102ms96ms0ms3rd

Showing top 10 of 13 scripts

D
JS Bundles
Action
169 scripts, 311 KB unused
FIX
169 scripts, 311 KB unused
Warning::
https://cdn.cookielaw.org/scripttemplates/202508.2...: 73 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ikea.com/fr/fr/user-generated-content/...: 62 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ikea.com/fr/fr/ugc/ratings-reviews/lea...: 40 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ikea.com/fr/fr/experiment-fragment/scr...: 33 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ikea.com/fr/fr/header-footer/javascrip...: 27 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 311 KB
311 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js121 KB73 KB (61%)✓3rd
https://www.ikea.com/fr/fr/user-generated-content/rr-pip/app/rr-pip.d407618c.bundle.js88 KB62 KB (71%)✓3rd
https://www.ikea.com/fr/fr/ugc/ratings-reviews/leave-review/fragments/rr-leave-review.bundle-5ece4ef4.js59 KB40 KB (68%)✓3rd
https://www.ikea.com/fr/fr/experiment-fragment/scripts/index-B53ZSB5Y.js46 KB33 KB (74%)✓3rd
https://www.ikea.com/fr/fr/header-footer/javascripts/main.bb4dc6b4eabf0d8b82cf.js50 KB27 KB (55%)✓3rd
https://www.ikea.com/fr/fr/header-footer/javascripts/mobileCinderella.99e1978965177ef44ac6.js32 KB26 KB (81%)✓3rd
https://www.ikea.com/fr/fr/header-footer/javascripts/postalCodePicker.79204a7b7c785664a029.js37 KB25 KB (69%)✓3rd
https://www.ikea.com/fr/fr/header-footer/javascripts/storePicker.5e099040433e167c8ade.js29 KB25 KB (86%)✓3rd
https://www.ikea.com/global/assets/dwf/hri/chevron-left-zHrqGni2.js1 KB—✓3rd
https://www.ikea.com/global/assets/dwf/hri/store.route-k-kLvcIp.js13 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

B
Image Optimization
85 images, 0 KB saveable
REVIEW
85 images, 0 KB saveable
Info::
All images are well-optimized
85 images 916 KB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
ETag present — enables conditional (304) responses
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
2 fonts (23 KB)
PASS
2 fonts (23 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

23 KB total

Render-blocking

0

of 2

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 FCP 839 ms LCP 1.5 shttps://www.ikea.com/global/assets/fonts/woff2/noto-ikea-400.latin.5a052965.woff2noto-ikea-400.latin.5a0... https://www.ikea.com/global/assets/fonts/woff2/noto-ikea-400.latin.5a052965.woff2 — 11.6 KiB — 0 ms — font-display: swaphttps://www.ikea.com/global/assets/fonts/woff2/noto-ikea-700.latin.a3f10ed8.woff2noto-ikea-700.latin.a3f... https://www.ikea.com/global/assets/fonts/woff2/noto-ikea-700.latin.a3f10ed8.woff2 — 11.6 KiB — 0 ms — font-display: swap
noto-ikea-400.latin.5a0... woff2 swap
Size 12 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
noto-ikea-700.latin.a3f... woff2 swap
Size 12 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+
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
347 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 6960ms · 431KB · €76/mo
www.ikea.com
Other
Costly
Execution 4549ms
Transfer 81 KB
Monthly Cost €49/mo
Unattributable
Other
Costly
Execution 885ms
Transfer 0 KB
Monthly Cost €10/mo
www.ikea.com
Other
Costly
Execution 247ms
Transfer 7 KB
Monthly Cost €3/mo
www.ikea.com
Other
Costly
Execution 225ms
Transfer 14 KB
Monthly Cost €2/mo
www.ikea.com
Other
Optional
Execution 181ms
Transfer 30 KB
Monthly Cost €2/mo
www.ikea.com
Other
Optional
Execution 160ms
Transfer 88 KB
Unused 71%
Monthly Cost €2/mo
www.ikea.com
Other
Optional
Execution 157ms
Transfer 3 KB
Monthly Cost €2/mo
OneTrust
Consent
Essential
Execution 150ms
Transfer 121 KB
Unused 61%
Monthly Cost €2/mo
www.ikea.com
Other
Optional
Execution 127ms
Transfer 2 KB
Monthly Cost €1/mo
www.ikea.com
Other
Optional
Execution 102ms
Transfer 1 KB
Monthly Cost €1/mo
www.ikea.com
Other
Optional
Execution 60ms
Transfer 50 KB
Unused 55%
Monthly Cost €1/mo
www.ikea.com
Other
Optional
Execution 60ms
Transfer 32 KB
Unused 81%
Monthly Cost €1/mo
challenges.cloudflare.com
Other
Optional
Execution 57ms
Transfer 0 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.ikea.com adds 4549ms and costs ~€49/month
  • Unattributable adds 885ms and costs ~€10/month
  • www.ikea.com adds 247ms and costs ~€3/month
  • www.ikea.com adds 225ms 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

www.ikea.com takes 4549ms 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 885ms 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.ikea.com takes 247ms 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.ikea.com takes 225ms 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 www.ikea.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

55% of www.ikea.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

81% of www.ikea.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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