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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
47
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.
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.

3.73 s

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

9.37 s

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

583 ms

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

0.010

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

6.62 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.

9.48 s

Page Load Progression

598 ms
1.2 s
1.8 s
2.4 s
3.0 s
3.6 s
4.2 s
4.8 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
7.9 MB transferred, 101 requests
FIX
7.9 MB transferred, 101 requests
Critical::
Page weighs 10.5 MB (7.9 MB transferred)
Warning::
JavaScript is 514 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 514 KB
Warning::
101 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.7 g CO2 per page load
7.9 MB / 2.4 MB budget
7.9 MB transferred
101 requests
1.7 g CO2 per page load
Other 6.9 MiB 88%
JavaScript 514.2 KiB 6%
Images 337.8 KiB 4%
Fonts 48.1 KiB 1%
Other 47.1 KiB 1%
HTML 29.7 KiB 0%
CSS 21.7 KiB 0%
Other 3.6 KiB 0%
Other 1.5 KiB 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

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 (7.9 MiB of 7.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5689ms total JS execution
FIX
5689ms total JS execution
Warning::
https://www.qt.io/: 1858ms CPU time
Warning::
Unattributable: 1402ms CPU time
Warning::
https://js-eu1.hs-analytics.net/analytics/17768847...: 752ms CPU time
Warning::
https://cdn.jsdelivr.net/npm/swiper@8.4.7/swiper-b...: 585ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T2G...: 369ms CPU time
Warning::
Third-party scripts: 5689ms (100% of total)

Main Thread Breakdown

Other 33% Script Evaluation 30% Style & Layout 20% Rendering 9% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.qt.io/1858ms27ms14ms3rd
Unattributable1402ms166ms0ms3rd
https://js-eu1.hs-analytics.net/analytics/1776884700000/149513.js752ms516ms14ms3rd
https://cdn.jsdelivr.net/npm/swiper@8.4.7/swiper-bundle.min.js585ms111ms27ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T2GWQM369ms271ms78ms3rd
https://cdn.cookielaw.org/scripttemplates/202405.2.0/otBannerSdk.js347ms217ms55ms3rd
https://149513.fs1.hubspotusercontent-eu1.net/hubfs/149513/hub_generated/module_assets/1/279671764160/1775037914404/module_Product_Carousel.js135ms135ms0ms3rd
https://js-eu1.hubspot.com/web-interactives-embed.js92ms77ms12ms3rd
https://149513.fs1.hubspotusercontent-eu1.net/hubfs/149513/hub_generated/module_assets/1/84194855509/1775037919860/module_Backgrounds.js91ms32ms0ms3rd
https://www.qt.io/hubfs/hub_generated/template_assets/1/84194138523/1776886981446/template_swiss-main.min.js57ms24ms2ms3rd
D
Page Weight Inventory
Action
101 resources · 7.9 MB · 183 KB savings available
FIX
101 resources · 7.9 MB · 183 KB savings available
Warning::
Page weight 6.9 MB over 1MB target
Got: 7.9 MB Expected: ≤ 1 MB
Info::
~183 KB of savings available
Warning::
100 third-party resources (100% of weight)
Info::
2 resources over 200KB
101 resources · 7.9 MiB · 100 third-party 6.9 MiB over 1MB target
Media 88% · 6.9 MiB
JavaScript 6% · 514.2 KiB
Image 4% · 339.5 KiB
Font 1% · 48.1 KiB
Other 1% · 46.0 KiB
Document 0% · 30.0 KiB
CSS 0% · 26.0 KiB

~183.1 KiB of savings available

Remove unused JavaScript: 183.1 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.

C
Image Optimization
Action
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
https://www.qt.io/hubfs/raw_assets/public/qtv3/ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/Harman_logo_frontpage.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/SQS-web.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/Novatron_logo_frontpage.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/Design-web.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/Develop-web.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/ABB_logo_frontpage-1.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/Tableau_logo_frontpage-1.p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/BSH_logo_frontpage.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/MB_logo_frontpage.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/Deploy-web.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.qt.io/hubfs/LG_logo_frontpage.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34 images 338 KB
0 oversized -0 KB
23 legacy format
12 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

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
JS Bundles
Action
27 scripts, 183 KB unused
REVIEW
27 scripts, 183 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T2G...: 82 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202405.2...: 59 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/npm/swiper@8.4.7/swiper-b...: 22 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7....: 20 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 183 KB
183 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-T2GWQM171 KB82 KB (48%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202405.2.0/otBannerSdk.js110 KB59 KB (54%)✓3rd
https://cdn.jsdelivr.net/npm/swiper@8.4.7/swiper-bundle.min.js40 KB22 KB (55%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js27 KB20 KB (76%)✓3rd
https://js-eu1.hs-banner.com/v2/149513/banner.js21 KB—✓3rd
https://www.qt.io/hubfs/hub_generated/template_assets/1/85031126346/1776886982640/template_header.min.js2 KB—✓3rd
https://www.qt.io/hubfs/hub_generated/template_assets/1/190992509310/1776886982307/template_qt.min.js0 KB—✓3rd
https://www.qt.io/hubfs/hub_generated/module_assets/1/159310607905/1775037920730/module_Asset.min.js1 KB—✓3rd
https://www.qt.io/hubfs/hub_generated/module_assets/1/281411670226/1775037916625/module_Item_Filtering.min.js1 KB—✓3rd
https://www.qt.io/hs/hsstatic/keyboard-accessible-menu-flyouts/static-1.17/bundles/project.js1 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

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
5 fonts (48 KB)
PASS
5 fonts (48 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

48 KB total

Render-blocking

0

of 5

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 7.0 s 8.0 s 9.0 s FCP 3.7 s LCP 9.4 shttps://fonts.googleapis.com/css?family=Titillium+Web:400,400i,600css https://fonts.googleapis.com/css?family=Titillium+Web:400,400i,600 — 597 B — 48 ms — font-display: swaphttps://fonts.gstatic.com/s/titilliumweb/v19/NaPDcZTIAOhVxoMyOr9n_E7ffBzCGItzYw.woff2NaPDcZTIAOhVxoMyOr9n_E7... https://fonts.gstatic.com/s/titilliumweb/v19/NaPDcZTIAOhVxoMyOr9n_E7ffBzCGItzYw.woff2 — 11.9 KiB — 14 ms — font-display: swaphttps://fonts.gstatic.com/s/titilliumweb/v19/NaPDcZTIAOhVxoMyOr9n_E7ffHjDGItzYw.woff2NaPDcZTIAOhVxoMyOr9n_E7... https://fonts.gstatic.com/s/titilliumweb/v19/NaPDcZTIAOhVxoMyOr9n_E7ffHjDGItzYw.woff2 — 11.5 KiB — 20 ms — font-display: swaphttps://fonts.gstatic.com/s/titilliumweb/v19/NaPecZTIAOhVxoMyOr9n_E7fdMPmDQ.woff2NaPecZTIAOhVxoMyOr9n_E7... https://fonts.gstatic.com/s/titilliumweb/v19/NaPecZTIAOhVxoMyOr9n_E7fdMPmDQ.woff2 — 12.1 KiB — 18 ms — font-display: swaphttps://fonts.gstatic.com/s/titilliumweb/v19/NaPDcZTIAOhVxoMyOr9n_E7ffGjEGItzYw.woff2NaPDcZTIAOhVxoMyOr9n_E7... https://fonts.gstatic.com/s/titilliumweb/v19/NaPDcZTIAOhVxoMyOr9n_E7ffGjEGItzYw.woff2 — 12.1 KiB — 13 ms — font-display: swap
css unknown swap
Size 1 KB
Load time 48 ms
Start 954 ms
Risk FOUT — text flashes from fallback to web font
NaPDcZTIAOhVxoMyOr9n_E7... woff2 swap
Size 12 KB
Load time 14 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
NaPDcZTIAOhVxoMyOr9n_E7... woff2 swap
Size 11 KB
Load time 20 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
NaPecZTIAOhVxoMyOr9n_E7... woff2 swap
Size 12 KB
Load time 18 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
NaPDcZTIAOhVxoMyOr9n_E7... woff2 swap
Size 12 KB
Load time 13 ms
Start 1.7 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
2
dns-prefetch
—
prefetch
—

2 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
Network Waterfall
101 requests over 3324ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.7 s LCP 9.4 shttps://qt.io// https://qt.io/ — 301 — 304 B — 248 ms — http/1.1https://www.qt.io/www.qt.io/ https://www.qt.io/ — 200 — 29.7 KiB — 678 ms — h2https://fonts.googleapis.com/css2?family=Titillium+Web:wght@300;400;600;700&display=swapfonts.googleapis.com/css2?family=Ti... https://fonts.googleapis.com/css2?family=Titillium+Web:wght@300;400;600;700&display=swap — 200 — 0 B — 7 ms — h2https://www.qt.io/hubfs/hub_generated/template_assets/1/190992509310/1776886982307/template_qt.min.jswww.qt.io/hubfs/hub_generated/templ... https://www.qt.io/hubfs/hub_generated/template_assets/1/190992509310/1776886982307/template_qt.min.js — 200 — 0 B — 9 ms — h2https://www.qt.io/hubfs/hub_generated/template_assets/1/84194855512/1776886979292/template_page-dnd.min.csswww.qt.io/hubfs/hub_generated/templ... https://www.qt.io/hubfs/hub_generated/template_assets/1/84194855512/1776886979292/template_page-dnd.min.css — 200 — 0 B — 7 ms — h2https://www.qt.io/hubfs/hub_generated/template_assets/1/84194741344/1776886980280/template_swiss-main.min.csswww.qt.io/hubfs/hub_generated/templ... https://www.qt.io/hubfs/hub_generated/template_assets/1/84194741344/1776886980280/template_swiss-main.min.css — 200 — 0 B — 8 ms — h2https://www.qt.io/hubfs/hub_generated/template_assets/1/84194816177/1776886982869/template_c-btn.min.csswww.qt.io/hubfs/hub_generated/templ... https://www.qt.io/hubfs/hub_generated/template_assets/1/84194816177/1776886982869/template_c-btn.min.css — 200 — 0 B — 27 ms — h2https://www.qt.io/hubfs/hub_generated/template_assets/1/85031126345/1776886977328/template_header.min.csswww.qt.io/hubfs/hub_generated/templ... https://www.qt.io/hubfs/hub_generated/template_assets/1/85031126345/1776886977328/template_header.min.css — 200 — 0 B — 27 ms — h2https://www.qt.io/hubfs/hub_generated/template_assets/1/316316438729/1776886983254/template_language-switcher.min.csswww.qt.io/hubfs/hub_generated/templ... https://www.qt.io/hubfs/hub_generated/template_assets/1/316316438729/1776886983254/template_language-switcher.min.css — 200 — 0 B — 28 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/95821412474/1775037911940/module_Site_Notice.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/95821412474/1775037911940/module_Site_Notice.min.css — 200 — 730 B — 57 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/84194855509/1775037919860/module_Backgrounds.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/84194855509/1775037919860/module_Backgrounds.min.css — 200 — 601 B — 338 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/311184064704/1775037912520/module_Banner.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/311184064704/1775037912520/module_Banner.min.css — 200 — 792 B — 60 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/84190938022/1776840396340/module_Columns.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/84190938022/1776840396340/module_Columns.min.css — 200 — 2.0 KiB — 345 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/195550585505/1775037913234/module_Text_Items.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/195550585505/1775037913234/module_Text_Items.min.css — 200 — 902 B — 58 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/84190938028/1775037917008/module_Logo_Listing.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/84190938028/1775037917008/module_Logo_Listing.min.css — 200 — 1.4 KiB — 292 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/279671764160/1775037914404/module_Product_Carousel.min.csswww.qt.io/hubfs/hub_generated/modul... 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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
100% of JavaScript execution is third-party
First-party Third-party 5689ms · 430KB · €62/mo
www.qt.io
Other
Costly
Execution 1858ms
Transfer 30 KB
Monthly Cost €20/mo
Unattributable
Other
Costly
Execution 1402ms
Transfer 0 KB
Monthly Cost €15/mo
js-eu1.hs-analytics.net
Other
Costly
Execution 752ms
Transfer 45 KB
Monthly Cost €8/mo
jsDelivr
CDN
Costly
Execution 585ms
Transfer 40 KB
Unused 55%
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 369ms
Transfer 171 KB
Unused 48%
Monthly Cost €4/mo
OneTrust
Consent
Essential
Execution 347ms
Transfer 110 KB
Unused 54%
Monthly Cost €4/mo
149513.fs1.hubspotusercontent-eu1.net
Other
Optional
Execution 135ms
Transfer 0 KB
Monthly Cost €1/mo
js-eu1.hubspot.com
Other
Optional
Execution 92ms
Transfer 28 KB
Monthly Cost €1/mo
149513.fs1.hubspotusercontent-eu1.net
Other
Optional
Execution 91ms
Transfer 0 KB
Monthly Cost €1/mo
www.qt.io
Other
Optional
Execution 57ms
Transfer 6 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.qt.io adds 1858ms and costs ~€20/month
  • Unattributable adds 1402ms and costs ~€15/month
  • js-eu1.hs-analytics.net adds 752ms and costs ~€8/month
  • jsDelivr adds 585ms and costs ~€6/month
  • Google Tag Manager adds 369ms and costs ~€4/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.qt.io takes 1858ms 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 1402ms 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

js-eu1.hs-analytics.net takes 752ms 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

jsDelivr takes 585ms 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

55% of jsDelivr'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

Google Tag Manager takes 369ms 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

54% 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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