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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
2
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
70
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.
100
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.

2.62 s

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

5.80 s

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

145 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.

5.19 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.

5.81 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
9 PASS 1 REVIEW 2 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 108 requests
FIX
2.5 MB transferred, 108 requests
Warning::
Page weighs 4.0 MB (2.5 MB transferred)
Warning::
108 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.53 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
108 requests
0.53 g CO2 per page load
Other 1.4 MiB 55%
Images 580.7 KiB 22%
JavaScript 294.5 KiB 11%
HTML 194.5 KiB 7%
CSS 45.1 KiB 2%
Fonts 23.2 KiB 1%
Other 21.0 KiB 1%
Other 2.9 KiB 0%
Other 2.5 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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
JS Execution Cost
Action
3019ms total JS execution
FIX
3019ms total JS execution
Warning::
Unattributable: 974ms CPU time
Warning::
https://www.ikea.com/: 765ms CPU time
Warning::
https://www.ikea.com/global/en/_astro/template.Bcm...: 724ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202508.2...: 244ms CPU time
Info::
https://www.ikea.com/global/en/esi/header/_astro/t...: 123ms CPU time
Info::
Third-party scripts: 1218ms (40% of total)

Main Thread Breakdown

Other 38% Script Evaluation 37% Style & Layout 15% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
Unattributable974ms197ms0ms3rd
https://www.ikea.com/765ms16ms1ms1st
https://www.ikea.com/global/en/_astro/template.BcmpHS5G.js724ms585ms0ms1st
https://cdn.cookielaw.org/scripttemplates/202508.2.0/otBannerSdk.js244ms97ms64ms3rd
https://www.ikea.com/global/en/esi/header/_astro/template.Bnl_uFrw.js123ms87ms0ms1st
https://www.ikea.com/global/en/esi/common/_astro/FragmentCommon.astro_astro_type_script_index_0_lang.Cnnml7II.js107ms91ms0ms1st
https://www.ikea.com/global/en/_astro/intersect.DRLYJVyI.js82ms71ms0ms1st
B
JS Bundles
65 scripts, 73 KB unused
REVIEW
65 scripts, 73 KB unused
Warning::
https://cdn.cookielaw.org/scripttemplates/202508.2...: 73 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 73 KB
73 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/global/en/esi/common/initOnetrust-9e5afaab.js2 KB—✓1st
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 KB—✓3rd
https://www.ikea.com/global/en/shared-data/regions.js4 KB—✓1st
https://www.ikea.com/global/en/esi/common/_astro/FragmentCommon.astro_astro_type_script_index_0_lang.Cnnml7II.js9 KB—✓1st
https://www.ikea.com/global/en/esi/header/_astro/extractFromInline.07e95cbd.js2 KB—✓1st
https://www.ikea.com/global/en/esi/footer/_astro/extractFromInline.114abd88.js2 KB—✓1st
https://www.ikea.com/global/en/_astro/extractFromInline.07e95cbd.js2 KB—✓1st
https://www.ikea.com/global/en/esi/common/_astro/runtime.BfvfjF8n.js7 KB—✓1st
https://www.ikea.com/global/en/esi/header/_astro/Header.BIyzStXR.js2 KB—✓1st

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

A+
Third-Party Impact
6% third-party, 0 ms blocking
PASS
6% third-party, 0 ms blocking
Info::
Third-party code accounts for 6% of page weight (152.6 KiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
94%
First-party Third-party
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+
Image Optimization
20 images, 0 KB saveable
PASS
20 images, 0 KB saveable
Info::
All images are well-optimized
20 images 581 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.6 s LCP 5.8 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 — 11.9 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 — 11.4 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 11 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
4
preload
2
dns-prefetch
—
prefetch
—

6 resource hints configured

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

A
HTTP Caching
max-age=900 (15 minutes)
PASS
max-age=900 (15 minutes)
Info::
Cache-Control header is set
Got: public, max-age=900
Info::
Effective TTL: 15 minutes (max-age=900)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=900

DirectiveValueMeaning
public—Any cache may store this response
max-age900Cache for 15 minutes
Effective TTL: 900 seconds
Network Waterfall
108 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
40% of JavaScript execution is third-party
First-party Third-party 1218ms · 121KB · €19/mo
Unattributable
Other
Costly
Execution 974ms
Transfer 0 KB
Monthly Cost €16/mo
OneTrust
Consent
Essential
Execution 244ms
Transfer 121 KB
Unused 61%
Monthly Cost €4/mo

These scripts may cost more than they're worth

  • Unattributable adds 974ms and costs ~€16/month

40% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 974ms 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

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

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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