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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
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.

1.53 s

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

2.55 s

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

4 ms

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

0.103

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

1.66 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.

2.66 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
15
7 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 48 requests
FIX
2.8 MB transferred, 48 requests
Warning::
Page weighs 3.4 MB (2.8 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Info::
48 HTTP requests
Info::
Estimated 0.58 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
48 requests
0.58 g CO2 per page load
Images 2.2 MiB 79%
JavaScript 463.2 KiB 16%
CSS 101.3 KiB 4%
Fonts 19.6 KiB 1%
HTML 9.9 KiB 0%
Other 2.0 KiB 0%
Other 551 B 0%
Other 542 B 0%
Other 445 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

D
JS Bundles
Action
9 scripts, 193 KB unused
FIX
9 scripts, 193 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MKZN...: 69 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TFV...: 64 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://de.com/assets/js/lib/jquery-3.5.1.min.js: 60 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://de.com/assets/js/main.js?v=1.0.1: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 193 KB
193 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-MKZNKH9202&cx=c&gtm=4e64k0h2169 KB69 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TFV3DKX126 KB64 KB (51%)✓3rd
https://de.com/assets/js/lib/jquery-3.5.1.min.js88 KB60 KB (68%)✓1st
https://de.com/assets/js/lib/modernizr.min.js?v=1.013 KB—✓1st
https://de.com/assets/js/main.js?v=1.0.15 KB—✗1st
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://de.com/assets/js/lib/underscore.min.js?v=1.0.116 KB—✓1st
https://de.com/assets/js/search.js?v=1.1.016 KB—✗1st
https://de.com/assets/js/home.js?v=1.0.110 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

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
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://de.com/assets/img/icons/seo-market.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://de.com/assets/img/icons/startup-expansion.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://de.com/assets/img/icons/premium-availabili... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://de.com/assets/img/icons/mag-glass-location... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://de.com/assets/img/logos/decom-white-single... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://de.com/assets/img/logos/decom-primary.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://de.com/assets/img/icons/unrestricted-globa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://de.com/assets/img/icons/german-market.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://de.com/assets/img/domain-comparison-table-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 2.2 MB
0 oversized -0 KB
30 legacy format
9 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

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
Page Weight Inventory
Action
48 resources · 2.8 MB · 193 KB savings available
REVIEW
48 resources · 2.8 MB · 193 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~193 KB of savings available
Info::
8 third-party resources (11% of weight)
Info::
2 resources over 200KB
48 resources · 2.8 MiB · 8 third-party 1.8 MiB over 1MB target
Image 79% · 2.2 MiB
JavaScript 16% · 463.2 KiB
CSS 4% · 101.3 KiB
Font 1% · 19.6 KiB
Document 0% · 9.9 KiB
Other 0% · 1.5 KiB

~192.8 KiB of savings available

Remove unused JavaScript: 192.8 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
11% third-party, 0 ms blocking
PASS
11% third-party, 0 ms blocking
Info::
Third-party code accounts for 11% of page weight (317.5 KiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
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+
JS Execution Cost
488ms total JS execution
PASS
488ms total JS execution
Info::
Unattributable: 139ms CPU time
Info::
https://de.com/: 135ms CPU time
Info::
https://de.com/assets/js/home.js?v=1.0.1: 94ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-MKZN...: 67ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TFV...: 52ms CPU time
Warning::
Third-party scripts: 259ms (53% of total)

Main Thread Breakdown

Other 37% Script Evaluation 32% Style & Layout 18% Rendering 7% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
Unattributable139ms22ms0ms3rd
https://de.com/135ms1ms0ms1st
https://de.com/assets/js/home.js?v=1.0.194ms21ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-MKZNKH9202&cx=c&gtm=4e64k0h267ms54ms13ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TFV3DKX52ms36ms11ms3rd
A+
Font Loading
2 fonts (20 KB)
PASS
2 fonts (20 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

20 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 2.0 s 2.5 s FCP 1.5 s LCP 2.6 shttps://de.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2albert-sans-v1-latin-re... https://de.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 9.7 KiB — 252 ms — font-display: swaphttps://de.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2albert-sans-v1-latin-90... https://de.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 9.8 KiB — 281 ms — font-display: swap
albert-sans-v1-latin-re... woff2 swap
Size 10 KB
Load time 252 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
albert-sans-v1-latin-90... woff2 swap
Size 10 KB
Load time 281 ms
Start 1.0 s
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
48 requests over 2603ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.5 s LCP 2.6 shttps://de.com// https://de.com/ — 200 — 9.9 KiB — 480 ms — http/1.1https://de.com/assets/css/bootstrap-grid.min.css/assets/css/bootstrap-grid.min.css https://de.com/assets/css/bootstrap-grid.min.css — 200 — 50.5 KiB — 317 ms — http/1.1https://de.com/assets/css/style.css?v=1.1.3/assets/css/style.css?v=1.1.3 https://de.com/assets/css/style.css?v=1.1.3 — 200 — 50.8 KiB — 489 ms — http/1.1https://de.com/assets/js/lib/modernizr.min.js?v=1.0/assets/js/lib/modernizr.min.js?v=1... https://de.com/assets/js/lib/modernizr.min.js?v=1.0 — 200 — 12.7 KiB — 476 ms — http/1.1https://de.com/assets/img/logos/decom-white-single-color.svg/assets/img/logos/decom-white-singl... https://de.com/assets/img/logos/decom-white-single-color.svg — 200 — 10.6 KiB — 477 ms — http/1.1https://de.com/assets/img/logos/decom-primary.svg/assets/img/logos/decom-primary.svg https://de.com/assets/img/logos/decom-primary.svg — 200 — 141.1 KiB — 952 ms — http/1.1https://de.com/assets/img/icons/loader.svg/assets/img/icons/loader.svg https://de.com/assets/img/icons/loader.svg — 200 — 3.0 KiB — 160 ms — http/1.1https://de.com/assets/img/icons/unrestricted-global.svg/assets/img/icons/unrestricted-glob... https://de.com/assets/img/icons/unrestricted-global.svg — 200 — 9.3 KiB — 167 ms — http/1.1https://de.com/assets/img/icons/german-market.svg/assets/img/icons/german-market.svg https://de.com/assets/img/icons/german-market.svg — 200 — 11.5 KiB — 164 ms — http/1.1https://de.com/assets/js/lib/jquery-3.5.1.min.js/assets/js/lib/jquery-3.5.1.min.js https://de.com/assets/js/lib/jquery-3.5.1.min.js — 200 — 87.6 KiB — 508 ms — http/1.1https://de.com/assets/js/main.js?v=1.0.1/assets/js/main.js?v=1.0.1 https://de.com/assets/js/main.js?v=1.0.1 — 200 — 5.1 KiB — 492 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-TFV3DKXwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TFV3DKX — 200 — 125.5 KiB — 138 ms — h2https://de.com/assets/img/de-map.svg/assets/img/de-map.svg https://de.com/assets/img/de-map.svg — 200 — 4.8 KiB — 295 ms — http/1.1https://de.com/assets/img/hero-bg-gradient.png/assets/img/hero-bg-gradient.png https://de.com/assets/img/hero-bg-gradient.png — 200 — 134.2 KiB — 734 ms — http/1.1https://de.com/assets/img/icons/baseline-open_in_new-24px.svg/assets/img/icons/baseline-open_in_... https://de.com/assets/img/icons/baseline-open_in_new-24px.svg — 200 — 795 B — 445 ms — http/1.1https://de.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2/assets/fonts/albert-sans/albert-sa... https://de.com/assets/fonts/albert-sans/albert-sans-v1-latin-regular.woff2 — 200 — 9.7 KiB — 252 ms — http/1.1https://de.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2/assets/fonts/albert-sans/albert-sa... https://de.com/assets/fonts/albert-sans/albert-sans-v1-latin-900.woff2 — 200 — 9.8 KiB — 281 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-MKZNKH9202&cx=c&gtm=4e64k0h2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-MKZNKH9202&cx=c&gtm=4e64k0h2 — 200 — 169.1 KiB — 61 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 94 ms — h2https://de.com/assets/js/lib/underscore.min.js?v=1.0.1/assets/js/lib/underscore.min.js?v=... https://de.com/assets/js/lib/underscore.min.js?v=1.0.1 — 200 — 16.3 KiB — 168 ms — http/1.1https://region1.analytics.google.com/g/collect?v=2&tid=G-MKZNKH9202&gtm=45je64k0h2v881179902z8866586369za20gzb866586369zd866586369&_p=1776799880144&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&_ng=1&are=1&cid=609749495.1776799881&frm=0&pscdl=noapi&rcb=10&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401&sid=1776799880&sct=1&seg=0&dl=https%3A%2F%2Fde.com%2F&dt=.DE.COM%20%7C%20A%20Global%20Domain%20for%20Businesses%20in%20Germany&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1341region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-MKZNKH9202&gtm=45je64k0h2v881179902z8866586369za20gzb866586369zd866586369&_p=1776799880144&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&_ng=1&are=1&cid=609749495.1776799881&frm=0&pscdl=noapi&rcb=10&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401&sid=1776799880&sct=1&seg=0&dl=https%3A%2F%2Fde.com%2F&dt=.DE.COM%20%7C%20A%20Global%20Domain%20for%20Businesses%20in%20Germany&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1341 — 204 — 542 B — 74 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&_ng=1&tid=G-MKZNKH9202&cid=609749495.1776799881&gtm=45je64k0h2v881179902z8866586369za20gzb866586369zd866586369&rcb=10&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938465~115938468~117266401stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&_ng=1&tid=G-MKZNKH9202&cid=609749495.1776799881&gtm=45je64k0h2v881179902z8866586369za20gzb866586369zd866586369&rcb=10&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938465~115938468~117266401 — 204 — 551 B — 78 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&_ng=1&tid=G-MKZNKH9202&cid=609749495.1776799881&gtm=45je64k0h2v881179902z8866586369za20gzb866586369zd866586369&rcb=10&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938465~115938468~117266401&z=1254494104www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&_ng=1&tid=G-MKZNKH9202&cid=609749495.1776799881&gtm=45je64k0h2v881179902z8866586369za20gzb866586369zd866586369&rcb=10&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l1l1&npa=1&frm=0&tag_exp=0~115616986~115938465~115938468~117266401&z=1254494104 — 200 — 408 B — 77 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=905682575&t=pageview&_s=1&dl=https%3A%2F%2Fde.com%2F&ul=en-us&dt=.DE.COM%20%7C%20A%20Global%20Domain%20for%20Businesses%20in%20Germany&sr=800x600&vp=1350x940&_u=YADAAEABAAAAACAAI~&jid=1893844065&gjid=567830510&cid=609749495.1776799881&tid=UA-202809105-1&_gid=302558152.1776799881&_r=1&_slc=1&gtm=45He64k0h2n81TFV3DKXv866586369za200zd866586369&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938468~117266400&npa=1&z=2037795183www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=905682575&t=pageview&_s=1&dl=https%3A%2F%2Fde.com%2F&ul=en-us&dt=.DE.COM%20%7C%20A%20Global%20Domain%20for%20Businesses%20in%20Germany&sr=800x600&vp=1350x940&_u=YADAAEABAAAAACAAI~&jid=1893844065&gjid=567830510&cid=609749495.1776799881&tid=UA-202809105-1&_gid=302558152.1776799881&_r=1&_slc=1&gtm=45He64k0h2n81TFV3DKXv866586369za200zd866586369&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938468~117266400&npa=1&z=2037795183 — 200 — 445 B — 26 ms — h2https://de.com/assets/js/search.js?v=1.1.0/assets/js/search.js?v=1.1.0 https://de.com/assets/js/search.js?v=1.1.0 — 200 — 16.2 KiB — 161 ms — http/1.1https://de.com/assets/js/home.js?v=1.0.1/assets/js/home.js?v=1.0.1 https://de.com/assets/js/home.js?v=1.0.1 — 200 — 9.8 KiB — 159 ms — http/1.1https://de.com/assets/img/icons/seo-market.svg/assets/img/icons/seo-market.svg https://de.com/assets/img/icons/seo-market.svg — 200 — 7.8 KiB — 165 ms — http/1.1https://de.com/assets/img/icons/premium-availability.svg/assets/img/icons/premium-availabil... https://de.com/assets/img/icons/premium-availability.svg — 200 — 7.7 KiB — 165 ms — http/1.1https://de.com/assets/img/icons/startup-expansion.svg/assets/img/icons/startup-expansion... https://de.com/assets/img/icons/startup-expansion.svg — 200 — 6.5 KiB — 169 ms — http/1.1https://de.com/assets/img/oversized-icon.svg/assets/img/oversized-icon.svg https://de.com/assets/img/oversized-icon.svg — 200 — 190.6 KiB — 318 ms — http/1.1
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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
53% of JavaScript execution is third-party
First-party Third-party 259ms · 295KB · €3/mo
Unattributable
Other
Optional
Execution 139ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 169 KB
Unused 41%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 52ms
Transfer 126 KB
Unused 51%
Monthly Cost €1/mo

53% 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

51% 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

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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