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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.10 s

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

2.40 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.

0.966

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

2.71 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.

2.41 s

Page Load Progression

681 ms
1.4 s
2.0 s
2.7 s
3.4 s
4.1 s
4.8 s
5.4 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
8.5 MB transferred, 104 requests
FIX
8.5 MB transferred, 104 requests
Critical::
Page weighs 10.2 MB (8.5 MB transferred)
Warning::
JavaScript is 517 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 517 KB
Warning::
104 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.8 g CO2 per page load
8.5 MB / 2.4 MB budget
8.5 MB transferred
104 requests
1.8 g CO2 per page load
Other 7.5 MiB 88%
JavaScript 516.9 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 (8.5 MiB of 8.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
104 resources · 8.5 MB · 183 KB savings available
FIX
104 resources · 8.5 MB · 183 KB savings available
Warning::
Page weight 7.5 MB over 1MB target
Got: 8.5 MB Expected: ≤ 1 MB
Info::
~183 KB of savings available
Warning::
103 third-party resources (100% of weight)
Info::
2 resources over 200KB
104 resources · 8.5 MiB · 103 third-party 7.5 MiB over 1MB target
Media 88% · 7.5 MiB
JavaScript 6% · 516.9 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
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
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/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/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/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/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/LG_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/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/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/raw_assets/public/qtv3/ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 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 Execution Cost
Action
1068ms total JS execution
REVIEW
1068ms total JS execution
Warning::
https://www.qt.io/: 377ms CPU time
Warning::
Unattributable: 311ms CPU time
Info::
https://js-eu1.hs-analytics.net/analytics/17768847...: 163ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-T2G...: 115ms CPU time
Info::
https://cdn.cookielaw.org/scripttemplates/202405.2...: 101ms CPU time
Warning::
Third-party scripts: 1068ms (100% of total)

Main Thread Breakdown

Script Evaluation 33% Other 30% Style & Layout 22% Script Parsing & Compilation 6% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.qt.io/377ms7ms5ms3rd
Unattributable311ms32ms0ms3rd
https://js-eu1.hs-analytics.net/analytics/1776884700000/149513.js163ms111ms4ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T2GWQM115ms76ms38ms3rd
https://cdn.cookielaw.org/scripttemplates/202405.2.0/otBannerSdk.js101ms66ms15ms3rd
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.sentry-cdn.com/13e30a996814c1283bdbb44a956d6442.min.js3 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.1 s LCP 2.4 shttps://fonts.googleapis.com/css?family=Titillium+Web:400,400i,600css https://fonts.googleapis.com/css?family=Titillium+Web:400,400i,600 — 597 B — 41 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 — 9 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 — 10 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 — 24 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 — 15 ms — font-display: swap
css unknown swap
Size 1 KB
Load time 41 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
NaPDcZTIAOhVxoMyOr9n_E7... woff2 swap
Size 12 KB
Load time 9 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
NaPDcZTIAOhVxoMyOr9n_E7... woff2 swap
Size 11 KB
Load time 10 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
NaPecZTIAOhVxoMyOr9n_E7... woff2 swap
Size 12 KB
Load time 24 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
NaPDcZTIAOhVxoMyOr9n_E7... woff2 swap
Size 12 KB
Load time 15 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
104 requests over 3414ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 2.4 shttps://qt.io// https://qt.io/ — 301 — 304 B — 243 ms — http/1.1https://www.qt.io/www.qt.io/ https://www.qt.io/ — 200 — 29.7 KiB — 968 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 — 29 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 — 34 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 — 29 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 — 29 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 — 29 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 — 30 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 — 32 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 — 498 B — 178 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 — 578 B — 309 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 — 813 B — 77 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 — 938 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 — 858 B — 64 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 — 67 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/279671764160/1775037914404/module_Product_Carousel.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/279671764160/1775037914404/module_Product_Carousel.min.css — 200 — 2.2 KiB — 295 ms — h2https://cdn.jsdelivr.net/npm/swiper@8.4.7/swiper-bundle.min.csscdn.jsdelivr.net/npm/swiper@8.4.7/s... https://cdn.jsdelivr.net/npm/swiper@8.4.7/swiper-bundle.min.css — 200 — 5.2 KiB — 36 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/159310607905/1775037920730/module_Asset.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/159310607905/1775037920730/module_Asset.min.css — 200 — 1.0 KiB — 64 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/281411670226/1775037916625/module_Item_Filtering.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/281411670226/1775037916625/module_Item_Filtering.min.css — 200 — 999 B — 57 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/84194138520/1775037905171/module_Spacing.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/84194138520/1775037905171/module_Spacing.min.css — 200 — 779 B — 231 ms — h2https://www.qt.io/hubfs/hub_generated/module_assets/1/84194648896/1775037921266/module_Image_Text.min.csswww.qt.io/hubfs/hub_generated/modul... https://www.qt.io/hubfs/hub_generated/module_assets/1/84194648896/1775037921266/module_Image_Text.min.css — 200 — 2.5 KiB — 55 ms — h2https://www.qt.io/hubfs/hub_generated/template_assets/1/86192723069/1776886980122/template_footer.min.csswww.qt.io/hubfs/hub_generated/templ... https://www.qt.io/hubfs/hub_generated/template_assets/1/86192723069/1776886980122/template_footer.min.css — 200 — 2.9 KiB — 58 ms — h2https://js.sentry-cdn.com/13e30a996814c1283bdbb44a956d6442.min.jsjs.sentry-cdn.com/13e30a996814c1283... https://js.sentry-cdn.com/13e30a996814c1283bdbb44a956d6442.min.js — 200 — 2.6 KiB — 31 ms — h2https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.jscdnjs.cloudflare.com/ajax/libs/jque... https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js — 200 — 27.5 KiB — 37 ms — h3https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 47 ms — h2https://fonts.googleapis.com/css?family=Titillium+Web:400,400i,600fonts.googleapis.com/css?family=Tit... https://fonts.googleapis.com/css?family=Titillium+Web:400,400i,600 — 200 — 597 B — 41 ms — h2https://www.qt.io/hubfs/Frame%206762.svgwww.qt.io/hubfs/Frame%206762.svg https://www.qt.io/hubfs/Frame%206762.svg — 200 — 518 B — 239 ms — h2https://www.qt.io/hs/hsstatic/cos-i18n/static-1.53/bundles/project.jswww.qt.io/hs/hsstatic/cos-i18n/stat... https://www.qt.io/hs/hsstatic/cos-i18n/static-1.53/bundles/project.js — 200 — 1004 B — 71 ms — 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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 1068ms · 355KB · €12/mo
www.qt.io
Other
Costly
Execution 377ms
Transfer 30 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 311ms
Transfer 0 KB
Monthly Cost €3/mo
js-eu1.hs-analytics.net
Other
Optional
Execution 163ms
Transfer 45 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 115ms
Transfer 171 KB
Unused 48%
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 101ms
Transfer 110 KB
Unused 54%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.qt.io adds 377ms and costs ~€4/month
  • Unattributable adds 311ms 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.qt.io takes 377ms 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 311ms 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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