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https://zalando.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
66
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
3

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

Mobile Desktop
78
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
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.

1.32 s

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

2.30 s

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

30 ms

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

0.007

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

2.72 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.

3.55 s

Page Load Progression

719 ms
1.4 s
2.2 s
2.9 s
3.6 s
4.3 s
5.0 s
5.8 s
Checks
16
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 112 requests
FIX
2.9 MB transferred, 112 requests
Warning::
Page weighs 8.6 MB (2.9 MB transferred)
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Info::
Fonts are 203 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 203 KB
Warning::
112 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.61 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
112 requests
0.61 g CO2 per page load
JavaScript 1.8 MiB 61%
Images 702.6 KiB 23%
Fonts 203.4 KiB 7%
Other 111.4 KiB 4%
HTML 100.9 KiB 3%
CSS 48.9 KiB 2%
Other 3.4 KiB 0%
Other 2.5 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

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 (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
43 scripts, 764 KB unused
FIX
43 scripts, 764 KB unused
Warning::
https://mosaic03.ztat.net/seo/glados/cbad27c6eaa5e...: 197 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://mosaic02.ztat.net/rnd/ng/re-common-chunk/i...: 122 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T3W...: 74 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-100...: 66 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://mosaic01.ztat.net/pnl/gtag/js?id=G-MDW1S9P...: 62 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 764 KB
764 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://mosaic03.ztat.net/seo/glados/cbad27c6eaa5e42abf15-main.js226 KB197 KB (87%)✓3rd
https://mosaic02.ztat.net/rnd/ng/re-common-chunk/index-252fdc6d1c203653e8bf.js173 KB122 KB (70%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T3W9FX&l=dataLayer151 KB74 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1006368194&cx=c&gtm=4e6550144 KB66 KB (46%)✓3rd
https://mosaic01.ztat.net/pnl/gtag/js?id=G-MDW1S9PQPW&l=dataLayerGA4171 KB62 KB (37%)✓3rd
https://app.usercentrics.eu/browser-ui/3.101.0/index.module.js121 KB53 KB (44%)✓3rd
https://mosaic02.ztat.net/rnd/ng/runtime-concurrent-e8de382cfcdcc9a95fba.js158 KB48 KB (30%)✓3rd
https://www.zalando.es/KAU4D/3/_I/zTpL/t1eXkK6H/3z5kcDJQuLr0Nhui/R05geBwNCA/c0VFXW/18TjQB181 KB39 KB (22%)✓3rd
https://www.zalando.es/KAU4D/3/_I/zTpL/t1eXkK6H/Qr5kcDYruL/FRVseBwNCA/SwxNLR/oQblcq?v=760b7de2-cd0a-3c5d-ee6a-8310d70a0210156 KB31 KB (20%)✓3rd
https://app.usercentrics.eu/browser-ui/3.101.0/VirtualServiceItem-ba2ffbd9.js49 KB27 KB (55%)✓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
Page Weight Inventory
Action
112 resources · 2.9 MB · 764 KB savings available
FIX
112 resources · 2.9 MB · 764 KB savings available
Warning::
Page weight 2.9 MB exceeds 1 MB target by 1.9 MB
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~764 KB of savings available
Warning::
111 third-party resources (100% of weight)
Info::
1 resources over 200KB
112 resources · 2.9 MiB · 111 third-party 1.9 MiB over 1MB target
JavaScript 61% · 1.8 MiB
Image 24% · 704.9 KiB
Font 7% · 203.4 KiB
Other 4% · 114.0 KiB
Document 3% · 101.9 KiB
CSS 2% · 48.9 KiB

~763.7 KiB of savings available

Remove unused JavaScript: 763.7 KiB
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.

B
Image Optimization
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://mosaic02.ztat.net/rnd/ng/app-qr-code/app-q... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 703 KB
0 oversized -0 KB
16 legacy format
1 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

C
JS Execution Cost
Action
1521ms total JS execution
REVIEW
1521ms total JS execution
Warning::
https://www.zalando.es/KAU4D/3/_I/zTpL/t1eXkK6H/Qr...: 288ms CPU time
Warning::
https://mosaic01.ztat.net/base-assets/9-1-0/requir...: 252ms CPU time
Info::
Unattributable: 212ms CPU time
Info::
https://www.zalando.es/: 199ms CPU time
Info::
https://mosaic01.ztat.net/base-assets/9-1-0/assets...: 186ms CPU time
Warning::
Third-party scripts: 1521ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Other 13% Script Parsing & Compilation 7% Style & Layout 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.zalando.es/KAU4D/3/_I/zTpL/t1eXkK6H/Qr5kcDYruL/FRVseBwNCA/SwxNLR/oQblcq?v=760b7de2-cd0a-3c5d-ee6a-8310d70a0210288ms271ms10ms3rd
https://mosaic01.ztat.net/base-assets/9-1-0/require-2.1.22.min.js252ms241ms1ms3rd
Unattributable212ms52ms0ms3rd
https://www.zalando.es/199ms15ms15ms3rd
https://mosaic01.ztat.net/base-assets/9-1-0/assets/bundle.js186ms157ms4ms3rd
https://www.zalando.es/KAU4D/3/_I/zTpL/t1eXkK6H/3z5kcDJQuLr0Nhui/R05geBwNCA/c0VFXW/18TjQB158ms144ms11ms3rd
https://mosaic01.ztat.net/pnl/gtag/js?id=G-MDW1S9PQPW&l=dataLayerGA492ms75ms10ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T3W9FX&l=dataLayer71ms61ms9ms3rd
https://app.usercentrics.eu/browser-ui/3.101.0/index.module.js64ms51ms0ms3rd
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 (203 KB)
PASS
3 fonts (203 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

203 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 1.3 s LCP 2.3 shttps://mosaic02.ztat.net/zds/assets/fonts/ZalandoSans[wdth,wght].ba6fc11d.woff2ZalandoSans[wdth,wght].... https://mosaic02.ztat.net/zds/assets/fonts/ZalandoSans[wdth,wght].ba6fc11d.woff2 — 93.5 KiB — 28 ms — font-display: swaphttps://mosaic01.ztat.net/zds/assets/fonts/867e79d.woff2867e79d.woff2 https://mosaic01.ztat.net/zds/assets/fonts/867e79d.woff2 — 58.3 KiB — 45 ms — font-display: swaphttps://mosaic01.ztat.net/zds/assets/fonts/76a99f7.woff276a99f7.woff2 https://mosaic01.ztat.net/zds/assets/fonts/76a99f7.woff2 — 51.5 KiB — 22 ms — font-display: swap
ZalandoSans[wdth,wght].... woff2 swap
Size 94 KB
Load time 28 ms
Start 343 ms
Risk FOUT — text flashes from fallback to web font
867e79d.woff2 woff2 swap
Size 58 KB
Load time 45 ms
Start 343 ms
Risk FOUT — text flashes from fallback to web font
76a99f7.woff2 woff2 swap
Size 52 KB
Load time 22 ms
Start 772 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
112 requests over 4839ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.3 s LCP 2.3 shttps://zalando.com// https://zalando.com/ — 302 — 245 B — 82 ms — h2https://www.zalando.es/www.zalando.es/ https://www.zalando.es/ — 200 — 98.9 KiB — 574 ms — h2https://mosaic02.ztat.net/zds/assets/fonts/ZalandoSans[wdth,wght].ba6fc11d.woff2mosaic02.ztat.net/zds/assets/fonts/... https://mosaic02.ztat.net/zds/assets/fonts/ZalandoSans[wdth,wght].ba6fc11d.woff2 — 200 — 93.5 KiB — 28 ms — h3https://mosaic01.ztat.net/zds/assets/fonts/867e79d.woff2mosaic01.ztat.net/zds/assets/fonts/... https://mosaic01.ztat.net/zds/assets/fonts/867e79d.woff2 — 200 — 58.3 KiB — 45 ms — h3https://mosaic01.ztat.net/base-assets/9-1-0/require-2.1.22.min.jsmosaic01.ztat.net/base-assets/9-1-0... https://mosaic01.ztat.net/base-assets/9-1-0/require-2.1.22.min.js — 200 — 8.3 KiB — 26 ms — h3https://mosaic01.ztat.net/base-assets/9-1-0/assets/bundle.jsmosaic01.ztat.net/base-assets/9-1-0... https://mosaic01.ztat.net/base-assets/9-1-0/assets/bundle.js — 200 — 80.2 KiB — 50 ms — h3https://mosaic01.ztat.net/base-assets/9-1-0/assets/style.cssmosaic01.ztat.net/base-assets/9-1-0... https://mosaic01.ztat.net/base-assets/9-1-0/assets/style.css — 200 — 3.1 KiB — 39 ms — h3https://mosaic01.ztat.net/base-assets/9-1-0/assets/z-shop-ui-styles.cssmosaic01.ztat.net/base-assets/9-1-0... https://mosaic01.ztat.net/base-assets/9-1-0/assets/z-shop-ui-styles.css — 200 — 8.6 KiB — 40 ms — h3https://mosaic02.ztat.net/zds/tokens/tokens-lagom-stage-1-typography-3.13.24.cssmosaic02.ztat.net/zds/tokens/tokens... https://mosaic02.ztat.net/zds/tokens/tokens-lagom-stage-1-typography-3.13.24.css — 200 — 3.6 KiB — 42 ms — h3https://mosaic02.ztat.net/zds/dx-ui/lib/atom-78.11.6.cssmosaic02.ztat.net/zds/dx-ui/lib/ato... https://mosaic02.ztat.net/zds/dx-ui/lib/atom-78.11.6.css — 200 — 33.2 KiB — 42 ms — h3https://js-de.sentry-cdn.com/83b56e9b949f4d020211cbf6b3e542ad.min.jsjs-de.sentry-cdn.com/83b56e9b949f4d... https://js-de.sentry-cdn.com/83b56e9b949f4d020211cbf6b3e542ad.min.js — 200 — 2.8 KiB — 7 ms — h2https://mosaic02.ztat.net/rnd/ng/@dx/experiments/index-a7f9365dc60a12d4d48c.jsmosaic02.ztat.net/rnd/ng/@dx/experi... https://mosaic02.ztat.net/rnd/ng/@dx/experiments/index-a7f9365dc60a12d4d48c.js — 200 — 1.2 KiB — 20 ms — h3https://mosaic02.ztat.net/rnd/ng/@dx/organisms-theming/index-61f802447c9e806c9d71.jsmosaic02.ztat.net/rnd/ng/@dx/organi... https://mosaic02.ztat.net/rnd/ng/@dx/organisms-theming/index-61f802447c9e806c9d71.js — 200 — 5.8 KiB — 21 ms — h3https://mosaic02.ztat.net/rnd/ng/runtime-concurrent-e8de382cfcdcc9a95fba.jsmosaic02.ztat.net/rnd/ng/runtime-co... https://mosaic02.ztat.net/rnd/ng/runtime-concurrent-e8de382cfcdcc9a95fba.js — 200 — 158.4 KiB — 29 ms — h3https://mosaic02.ztat.net/rnd/ng/re-runtime-chunk/index-82f7c5feedc76c0d7f3b.jsmosaic02.ztat.net/rnd/ng/re-runtime... https://mosaic02.ztat.net/rnd/ng/re-runtime-chunk/index-82f7c5feedc76c0d7f3b.js — 200 — 4.8 KiB — 21 ms — h3https://mosaic02.ztat.net/rnd/ng/re-common-chunk/index-252fdc6d1c203653e8bf.jsmosaic02.ztat.net/rnd/ng/re-common-... https://mosaic02.ztat.net/rnd/ng/re-common-chunk/index-252fdc6d1c203653e8bf.js — 200 — 173.4 KiB — 26 ms — h3https://mosaic01.ztat.net/base-assets/9-1-0/assets/z-shop-ui-fallback.jsmosaic01.ztat.net/base-assets/9-1-0... https://mosaic01.ztat.net/base-assets/9-1-0/assets/z-shop-ui-fallback.js — 200 — 20.1 KiB — 20 ms — h3https://www.zalando.es/akam/13/54f5f134www.zalando.es/akam/13/54f5f134 https://www.zalando.es/akam/13/54f5f134 — 200 — 9.3 KiB — 13 ms — h2https://mosaic02.ztat.net/rnd/ng/skip-buttons/index-47ae60797082eeff236c.jsmosaic02.ztat.net/rnd/ng/skip-butto... https://mosaic02.ztat.net/rnd/ng/skip-buttons/index-47ae60797082eeff236c.js — 200 — 1.7 KiB — 21 ms — h3https://img01.ztat.net/cnt/contentful-apps/uploads/025b3024-2959-4fe4-8cb8-68bcbfd15314.jpeg?imwidth=960img01.ztat.net/cnt/contentful-apps/... https://img01.ztat.net/cnt/contentful-apps/uploads/025b3024-2959-4fe4-8cb8-68bcbfd15314.jpeg?imwidth=960 — 200 — 99.7 KiB — 110 ms — h3https://img01.ztat.net/cnt/contentful-apps/uploads/13ea1dd6-f848-4e87-a066-b9c0a730b56d.jpeg?imwidth=960img01.ztat.net/cnt/contentful-apps/... https://img01.ztat.net/cnt/contentful-apps/uploads/13ea1dd6-f848-4e87-a066-b9c0a730b56d.jpeg?imwidth=960 — 200 — 169.3 KiB — 113 ms — h3https://img01.ztat.net/cnt/contentful-apps/uploads/1e4523e6-3759-4ee2-a0d9-282719135566.jpeg?imwidth=960img01.ztat.net/cnt/contentful-apps/... https://img01.ztat.net/cnt/contentful-apps/uploads/1e4523e6-3759-4ee2-a0d9-282719135566.jpeg?imwidth=960 — 200 — 87.6 KiB — 105 ms — h3https://img01.ztat.net/cnt/contentful-apps/uploads/3d23178e-bc92-4534-b075-64e23c6447b2.jpeg?imwidth=960img01.ztat.net/cnt/contentful-apps/... https://img01.ztat.net/cnt/contentful-apps/uploads/3d23178e-bc92-4534-b075-64e23c6447b2.jpeg?imwidth=960 — 200 — 74.4 KiB — 100 ms — h3https://img01.ztat.net/cnt/contentful-apps/uploads/f039431b-8973-45a4-9078-e0eb4030433d.jpeg?imwidth=960img01.ztat.net/cnt/contentful-apps/... https://img01.ztat.net/cnt/contentful-apps/uploads/f039431b-8973-45a4-9078-e0eb4030433d.jpeg?imwidth=960 — 200 — 115.3 KiB — 106 ms — h3https://img01.ztat.net/cnt/contentful-apps/uploads/754e879d-03bc-49c9-9502-b0f9723f7a5c.jpeg?imwidth=960img01.ztat.net/cnt/contentful-apps/... https://img01.ztat.net/cnt/contentful-apps/uploads/754e879d-03bc-49c9-9502-b0f9723f7a5c.jpeg?imwidth=960 — 200 — 126.8 KiB — 109 ms — h3https://mosaic03.ztat.net/seo/glados/951888b0d65dc157047c-main.cssmosaic03.ztat.net/seo/glados/951888... https://mosaic03.ztat.net/seo/glados/951888b0d65dc157047c-main.css — 200 — 468 B — 44 ms — h3https://mosaic01.ztat.net/zds/assets/svg/seur.1714603.svgmosaic01.ztat.net/zds/assets/svg/se... https://mosaic01.ztat.net/zds/assets/svg/seur.1714603.svg — 200 — 1.8 KiB — 20 ms — h3https://mosaic01.ztat.net/zds/assets/svg/dhl-express.2335bf2.svgmosaic01.ztat.net/zds/assets/svg/dh... https://mosaic01.ztat.net/zds/assets/svg/dhl-express.2335bf2.svg — 200 — 1.6 KiB — 22 ms — h3https://mosaic01.ztat.net/zds/assets/svg/ctt.e6156b1.svgmosaic01.ztat.net/zds/assets/svg/ct... https://mosaic01.ztat.net/zds/assets/svg/ctt.e6156b1.svg — 200 — 950 B — 26 ms — h3https://mosaic01.ztat.net/zds/assets/svg/mastercard.e559a34.svgmosaic01.ztat.net/zds/assets/svg/ma... https://mosaic01.ztat.net/zds/assets/svg/mastercard.e559a34.svg — 200 — 1.1 KiB — 34 ms — h3
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https://www.zalando.es/api/t/gtm/g/collect?v=2&tid=G-MDW1S9PQPW&gtm=45he6550v9173628720za204zd9173628720&_p=1778089777391&gcs=G100&gcd=13q3q3q2q5l1&npa=1&dma_cps=-&dma=1&ecid=634726661&_eu=EAAAAGA&_fplc=0&are=1&cid=1957869684.1778089779&frm=0&ir=1&pscdl=denied&rcb=13&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.137%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&ur=&sst.rnd=214553856.1778089779&sst.tft=1778089777391&sst.lpc=58774054&sst.navt=n&sst.ude=0&gaf=2&_s=3&tag_exp=0~115938466~115938468~116363097~117884344~118463262~118719172~118812187&sid=1778089778&sct=1&seg=1&dl=https%3A%2F%2Fwww.zalando.es%2F&dt=Zapatos%2C%20ropa%20y%20accesorios%20online%20%7C%20La%20mejor%20selecci%C3%B3n%20en%20Zalando&_tu=BA&en=view_content&_ee=1&gap.gtb=1&ep.consented_marketing_trackers=&ep.navigation_target_group=ALL&ep.initial_flow_id=nnQsoP1npMsV3s8y&ep.content_group=gender-split-home&ep.shop_language=es-ES&ep.market=ES&ep.browser_tab_id=pLJveYsDsG3_7C1cmgSwG&ep.screen_instance_id=1778089777391&ep.event_trigger_timestamp=2026-05-06T17%3A49%3A37.848Z&ep.entity_id_path=ern%3Acollection%3Acfl%3A5Pl7EvhGUxvBPLK1Y3mbDN%3B&ep.content_type_path=collection%3Ashop-selector%3B%3Afashion-assistant&ep.position_path=1%3B6&ep.component_name=chat_fashion-assistant&ep.parent_component_name=customer_shop-selector-view&ep.legacy_event_name=custom_view&ep.event_trigger_name=fashion_assistant_icon&ep.z_session_id=2c1791fe4b6bacb15c7e11ea9c1326d3bb873a074b5c1158bf330b4dff94273c&_et=2&tfd=2933&richsstsse — 200 — 664 B — 99 ms — h2https://www.zalando.es/KAU4D/3/_I/zTpL/t1eXkK6H/Qr5kcDYruL/FRVseBwNCA/SwxNLR/oQblcqwww.zalando.es/KAU4D/3/_I/zTpL/t1eX... https://www.zalando.es/KAU4D/3/_I/zTpL/t1eXkK6H/Qr5kcDYruL/FRVseBwNCA/SwxNLR/oQblcq — 200 — 923 B — 83 ms — h2https://www.zalando.es/api/t/iwww.zalando.es/api/t/i https://www.zalando.es/api/t/i — 202 — 623 B — 99 ms — h2https://www.zalando.es/api/t/cwww.zalando.es/api/t/c https://www.zalando.es/api/t/c — 202 — 621 B — 86 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 1521ms · 787KB · $20/mo
www.zalando.es
Other
Costly
Execution 288ms
Transfer 156 KB
Unused 20%
Monthly Cost $4/mo
mosaic01.ztat.net
Other
Costly
Execution 252ms
Transfer 8 KB
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 212ms
Transfer 0 KB
Monthly Cost $3/mo
www.zalando.es
Other
Optional
Execution 199ms
Transfer 99 KB
Monthly Cost $3/mo
mosaic01.ztat.net
Other
Optional
Execution 186ms
Transfer 80 KB
Unused 29%
Monthly Cost $2/mo
www.zalando.es
Other
Optional
Execution 158ms
Transfer 1 KB
Unused 22%
Monthly Cost $2/mo
mosaic01.ztat.net
Other
Optional
Execution 92ms
Transfer 171 KB
Unused 37%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 151 KB
Unused 49%
Monthly Cost $1/mo
app.usercentrics.eu
Other
Optional
Execution 64ms
Transfer 121 KB
Unused 44%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.zalando.es adds 288ms and costs ~$4/month
  • mosaic01.ztat.net adds 252ms and costs ~$3/month
  • Unattributable adds 212ms and costs ~$3/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.zalando.es takes 288ms 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

mosaic01.ztat.net takes 252ms 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 212ms 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

How third-party costs are calculated

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-04-07 — 2026-05-04)

LCP (p75)

932 ms

97% good

INP (p75)

62 ms

99% good

CLS (p75)

0.000

99% good

FCP (p75)

931 ms

TTFB (p75)

766 ms

This origin passes Core Web Vitals assessment
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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