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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
69
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.
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.

996 ms

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

10.15 s

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

70 ms

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

0.000

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

2.04 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.

10.44 s

Page Load Progression

500 ms
999 ms
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
14.1 MB transferred, 106 requests
FIX
14.1 MB transferred, 106 requests
Critical::
Page weighs 21.7 MB (14.1 MB transferred)
Warning::
Images are 6.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.7 MB
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.9 g CO2 per page load
14.1 MB / 2.4 MB budget
14.1 MB transferred
106 requests
2.9 g CO2 per page load
Images 6.7 MiB 48%
Other 5.3 MiB 38%
JavaScript 1.6 MiB 11%
Fonts 171.2 KiB 1%
CSS 102.1 KiB 1%
HTML 97.5 KiB 1%
Other 32.3 KiB 0%
Other 10.1 KiB 0%
Other 574 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

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 (14.1 MiB of 14.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
39 scripts, 799 KB unused
FIX
39 scripts, 799 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NEXN...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.iubenda.com/cookie_solution/iubenda_cs...: 68 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 799 KB
799 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NEXN8H46L5&cx=c&gtm=4e64k0h2174 KB70 KB (40%)✓3rd
https://cdn.iubenda.com/cookie_solution/iubenda_cs/1.98.0/core-en.js111 KB68 KB (62%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NK2TW8L199 KB51 KB (26%)✓3rd
https://www.arduino.cc/_next/static/chunks/pages/_app-6c6282e55ed0056f.js58 KB37 KB (64%)✓3rd
https://www.arduino.cc/_next/static/chunks/9104-95c6abddeae501c7.js36 KB22 KB (61%)✓3rd
https://www.arduino.cc/_next/static/chunks/9575-5ded90c66ba306b0.js36 KB21 KB (59%)✓3rd
https://www.arduino.cc/_next/static/chunks/9742.cfecb3637b05db11.js28 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

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
106 resources · 14.1 MB · 799 KB savings available
FIX
106 resources · 14.1 MB · 799 KB savings available
Warning::
Page weight 13.1 MB over 1MB target
Got: 14.1 MB Expected: ≤ 1 MB
Info::
~799 KB of savings available
Warning::
95 third-party resources (100% of weight)
Info::
7 resources over 200KB
106 resources · 14.1 MiB · 95 third-party 13.1 MiB over 1MB target
Image 48% · 6.8 MiB
Media 38% · 5.3 MiB
JavaScript 11% · 1.6 MiB
Font 1% · 171.2 KiB
CSS 1% · 102.1 KiB
Document 1% · 97.5 KiB
Other 0% · 36.9 KiB

~799.2 KiB of savings available

Remove unused JavaScript: 799.2 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
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Info::
All images are well-optimized
17 images 6.7 MB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1183ms total JS execution
REVIEW
1183ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 287ms CPU time
Warning::
Unattributable: 284ms CPU time
Info::
https://www.arduino.cc/: 164ms CPU time
Info::
https://www.arduino.cc/_next/static/chunks/framewo...: 140ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-NK2...: 131ms CPU time
Warning::
Third-party scripts: 1183ms (100% of total)

Main Thread Breakdown

Script Evaluation 54% Other 29% Style & Layout 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js287ms224ms0ms3rd
Unattributable284ms40ms0ms3rd
https://www.arduino.cc/164ms2ms0ms3rd
https://www.arduino.cc/_next/static/chunks/framework-f00fddb9800f9292.js140ms114ms4ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NK2TW8L131ms114ms15ms3rd
https://www.arduino.cc/_next/static/chunks/9575-5ded90c66ba306b0.js95ms26ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NEXN8H46L5&cx=c&gtm=4e64k0h281ms69ms12ms3rd
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
7 fonts (171 KB)
PASS
7 fonts (171 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

171 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 996 ms LCP 10.2 shttps://content.arduino.cc/fonts/Roboto-Mono-Bold-webfont.woffRoboto-Mono-Bold-webfon... https://content.arduino.cc/fonts/Roboto-Mono-Bold-webfont.woff — 26.7 KiB — 98 ms — font-display: swaphttps://content.arduino.cc/fonts/OpenSans-Bold-webfont.woffOpenSans-Bold-webfont.woff https://content.arduino.cc/fonts/OpenSans-Bold-webfont.woff — 20.7 KiB — 95 ms — font-display: swaphttps://content.arduino.cc/fonts/OpenSans-Regular-webfont.woffOpenSans-Regular-webfon... https://content.arduino.cc/fonts/OpenSans-Regular-webfont.woff — 20.7 KiB — 107 ms — font-display: swaphttps://content.arduino.cc/fonts/Roboto-Mono-Regular-webfont.woffRoboto-Mono-Regular-web... https://content.arduino.cc/fonts/Roboto-Mono-Regular-webfont.woff — 26.7 KiB — 108 ms — font-display: swaphttps://content.arduino.cc/fonts/OpenSans-Semibold-webfont.woffOpenSans-Semibold-webfo... https://content.arduino.cc/fonts/OpenSans-Semibold-webfont.woff — 20.8 KiB — 116 ms — font-display: swaphttps://content.arduino.cc/fonts/OpenSans-Italic-webfont.woffOpenSans-Italic-webfont... https://content.arduino.cc/fonts/OpenSans-Italic-webfont.woff — 21.8 KiB — 116 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 74 ms — font-display: swap
Roboto-Mono-Bold-webfon... woff swap
Size 27 KB
Load time 98 ms
Start 120 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Bold-webfont.woff woff swap
Size 21 KB
Load time 95 ms
Start 120 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Regular-webfon... woff swap
Size 21 KB
Load time 107 ms
Start 120 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Roboto-Mono-Regular-web... woff swap
Size 27 KB
Load time 108 ms
Start 120 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Semibold-webfo... woff swap
Size 21 KB
Load time 116 ms
Start 121 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Italic-webfont... woff swap
Size 22 KB
Load time 116 ms
Start 121 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 74 ms
Start 1.5 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)

Fixing the unchecked items could save ~41 KB and ~82 ms

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
106 requests over 3066ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 996 ms LCP 10.2 shttps://arduino.cc// https://arduino.cc/ — 301 — 297 B — 57 ms — h2https://www.arduino.cc/www.arduino.cc/ https://www.arduino.cc/ — 200 — 69.9 KiB — 89 ms — h3https://content.arduino.cc/fonts/Roboto-Mono-Bold-webfont.woffcontent.arduino.cc/fonts/Roboto-Mon... https://content.arduino.cc/fonts/Roboto-Mono-Bold-webfont.woff — 200 — 26.7 KiB — 98 ms — h3https://content.arduino.cc/fonts/OpenSans-Bold-webfont.woffcontent.arduino.cc/fonts/OpenSans-B... https://content.arduino.cc/fonts/OpenSans-Bold-webfont.woff — 200 — 20.7 KiB — 95 ms — h3https://content.arduino.cc/fonts/OpenSans-Regular-webfont.woffcontent.arduino.cc/fonts/OpenSans-R... https://content.arduino.cc/fonts/OpenSans-Regular-webfont.woff — 200 — 20.7 KiB — 107 ms — h3https://content.arduino.cc/fonts/Roboto-Mono-Regular-webfont.woffcontent.arduino.cc/fonts/Roboto-Mon... https://content.arduino.cc/fonts/Roboto-Mono-Regular-webfont.woff — 200 — 26.7 KiB — 108 ms — h3https://content.arduino.cc/fonts/OpenSans-Semibold-webfont.woffcontent.arduino.cc/fonts/OpenSans-S... https://content.arduino.cc/fonts/OpenSans-Semibold-webfont.woff — 200 — 20.8 KiB — 116 ms — h3https://content.arduino.cc/fonts/OpenSans-Italic-webfont.woffcontent.arduino.cc/fonts/OpenSans-I... https://content.arduino.cc/fonts/OpenSans-Italic-webfont.woff — 200 — 21.8 KiB — 116 ms — h3https://cdn.arduino.cc/header-footer/prod/cookieSolution.csscdn.arduino.cc/header-footer/prod/c... https://cdn.arduino.cc/header-footer/prod/cookieSolution.css — 200 — 5.1 KiB — 74 ms — h3https://www.arduino.cc/_next/static/css/90ba35feb71cde2a.csswww.arduino.cc/_next/static/css/90b... https://www.arduino.cc/_next/static/css/90ba35feb71cde2a.css — 200 — 46.4 KiB — 71 ms — h3https://www.arduino.cc/_next/static/css/90dfe282a754efa7.csswww.arduino.cc/_next/static/css/90d... https://www.arduino.cc/_next/static/css/90dfe282a754efa7.css — 200 — 2.0 KiB — 29 ms — h3https://www.arduino.cc/_next/static/css/2f39f2f3537629df.csswww.arduino.cc/_next/static/css/2f3... https://www.arduino.cc/_next/static/css/2f39f2f3537629df.css — 200 — 2.1 KiB — 41 ms — h3https://www.arduino.cc/_next/static/css/c924c4baaad337e3.csswww.arduino.cc/_next/static/css/c92... https://www.arduino.cc/_next/static/css/c924c4baaad337e3.css — 200 — 685 B — 43 ms — h3https://www.arduino.cc/_next/static/css/1877494b167afcc1.csswww.arduino.cc/_next/static/css/187... https://www.arduino.cc/_next/static/css/1877494b167afcc1.css — 200 — 1.8 KiB — 43 ms — h3https://www.arduino.cc/_next/static/css/9ecf58cd11b16fa7.csswww.arduino.cc/_next/static/css/9ec... https://www.arduino.cc/_next/static/css/9ecf58cd11b16fa7.css — 200 — 1.2 KiB — 27 ms — h3https://www.arduino.cc/_next/static/css/4440a680f9832684.csswww.arduino.cc/_next/static/css/444... https://www.arduino.cc/_next/static/css/4440a680f9832684.css — 200 — 667 B — 44 ms — h3https://www.arduino.cc/_next/static/chunks/387.11de658b66f767eb.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/387.11de658b66f767eb.js — 200 — 1.3 KiB — 53 ms — h3https://www.arduino.cc/_next/static/chunks/4010.7ce1954d61342ff7.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/4010.7ce1954d61342ff7.js — 200 — 4.5 KiB — 53 ms — h3https://www.arduino.cc/_next/static/chunks/6590.39c622cabf735c04.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/6590.39c622cabf735c04.js — 200 — 2.6 KiB — 58 ms — h3https://www.arduino.cc/_next/static/chunks/1600.e80c31bb8c886e1d.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/1600.e80c31bb8c886e1d.js — 200 — 2.1 KiB — 60 ms — h3https://www.arduino.cc/_next/static/chunks/9575-5ded90c66ba306b0.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/9575-5ded90c66ba306b0.js — 200 — 35.9 KiB — 75 ms — h3https://www.arduino.cc/_next/static/chunks/3646.e442f3dbc624618f.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/3646.e442f3dbc624618f.js — 200 — 4.3 KiB — 75 ms — h3https://www.arduino.cc/_next/static/chunks/5075.348ecaf5ec9672e5.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/5075.348ecaf5ec9672e5.js — 200 — 13.6 KiB — 80 ms — h3https://www.arduino.cc/_next/static/chunks/1099.58bb53eced3b6d6e.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/1099.58bb53eced3b6d6e.js — 200 — 1.9 KiB — 57 ms — h3https://www.arduino.cc/_next/static/chunks/7840.fd9bc36549f85b9c.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/7840.fd9bc36549f85b9c.js — 200 — 4.4 KiB — 65 ms — h3https://www.arduino.cc/_next/static/chunks/9742.cfecb3637b05db11.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/9742.cfecb3637b05db11.js — 200 — 28.2 KiB — 73 ms — h3https://www.arduino.cc/_next/static/chunks/3221.bec8ecc8d169e394.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/3221.bec8ecc8d169e394.js — 200 — 3.4 KiB — 83 ms — h3https://www.arduino.cc/_next/static/chunks/5364.ffbe220b2df40def.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/5364.ffbe220b2df40def.js — 200 — 2.8 KiB — 68 ms — h3https://www.arduino.cc/_next/static/chunks/5008.58b3314f8171a05c.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/5008.58b3314f8171a05c.js — 200 — 30.2 KiB — 79 ms — h3https://www.arduino.cc/_next/static/chunks/2590.da601b28fbf7a379.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/2590.da601b28fbf7a379.js — 200 — 5.0 KiB — 98 ms — h3
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 996 ms LCP 10.2 shttps://arduino.cc// https://arduino.cc/ — 301 — 297 B — 57 ms — h2https://www.arduino.cc/www.arduino.cc/ https://www.arduino.cc/ — 200 — 69.9 KiB — 89 ms — h3https://content.arduino.cc/fonts/Roboto-Mono-Bold-webfont.woffcontent.arduino.cc/fonts/Roboto-Mon... https://content.arduino.cc/fonts/Roboto-Mono-Bold-webfont.woff — 200 — 26.7 KiB — 98 ms — h3https://content.arduino.cc/fonts/OpenSans-Bold-webfont.woffcontent.arduino.cc/fonts/OpenSans-B... https://content.arduino.cc/fonts/OpenSans-Bold-webfont.woff — 200 — 20.7 KiB — 95 ms — h3https://content.arduino.cc/fonts/OpenSans-Regular-webfont.woffcontent.arduino.cc/fonts/OpenSans-R... https://content.arduino.cc/fonts/OpenSans-Regular-webfont.woff — 200 — 20.7 KiB — 107 ms — h3https://content.arduino.cc/fonts/Roboto-Mono-Regular-webfont.woffcontent.arduino.cc/fonts/Roboto-Mon... https://content.arduino.cc/fonts/Roboto-Mono-Regular-webfont.woff — 200 — 26.7 KiB — 108 ms — 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— 200 — 2.1 KiB — 67 ms — h3https://www.arduino.cc/cdn-cgi/image/width=1080,quality=60,format=auto/https://www.datocms-assets.com/150482/1761651540-qualcomarduino.svgwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=1080,quality=60,format=auto/https://www.datocms-assets.com/150482/1761651540-qualcomarduino.svg — 200 — 4.5 KiB — 79 ms — h3https://www.arduino.cc/cdn-cgi/image/width=640,quality=60,format=auto/https://www.datocms-assets.com/150482/1738946024-maker-solution-card.svgwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=640,quality=60,format=auto/https://www.datocms-assets.com/150482/1738946024-maker-solution-card.svg — 200 — 1.1 MiB — 275 ms — h3https://www.arduino.cc/cdn-cgi/image/width=640,quality=60,format=auto/https://www.datocms-assets.com/150482/1738941205-pro-solution-card.svgwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=640,quality=60,format=auto/https://www.datocms-assets.com/150482/1738941205-pro-solution-card.svg — 200 — 3.5 MiB — 414 ms — h3https://www.arduino.cc/cdn-cgi/image/width=640,quality=60,format=auto/https://www.datocms-assets.com/150482/1739176609-edu-solution-card.svgwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=640,quality=60,format=auto/https://www.datocms-assets.com/150482/1739176609-edu-solution-card.svg — 200 — 1.5 MiB — 287 ms — h3https://www.arduino.cc/cdn-cgi/image/width=1920,quality=60,format=auto/https://www.datocms-assets.com/150482/1758729200-hero-content.pngwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=1920,quality=60,format=auto/https://www.datocms-assets.com/150482/1758729200-hero-content.png — 200 — 48.2 KiB — 80 ms — h3https://www.arduino.cc/_next/static/chunks/reactPlayerFilePlayer.689258353e0f5071.jswww.arduino.cc/_next/static/chunks/... https://www.arduino.cc/_next/static/chunks/reactPlayerFilePlayer.689258353e0f5071.js — 200 — 3.3 KiB — 27 ms — h3https://embeds.iubenda.com/widgets/9a0b3c88-6db6-11ee-8bfc-5ad8d8c564c0.jsembeds.iubenda.com/widgets/9a0b3c88... https://embeds.iubenda.com/widgets/9a0b3c88-6db6-11ee-8bfc-5ad8d8c564c0.js — 200 — 10.6 KiB — 107 ms — h2https://www.arduino.cc/_next/data/4qJ0ibVGo3Pi6iHxuXXag/product-ventuno-q.json?slug=product-ventuno-qwww.arduino.cc/_next/data/4qJ0ibVGo... https://www.arduino.cc/_next/data/4qJ0ibVGo3Pi6iHxuXXag/product-ventuno-q.json?slug=product-ventuno-q — 200 — 29.9 KiB — 31 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 362.4 KiB — 177 ms — h2https://www.googletagmanager.com/gtag/js?id=G-NEXN8H46L5&cx=c&gtm=4e64k0h2www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-NEXN8H46L5&cx=c&gtm=4e64k0h2 — 200 — 174.1 KiB — 64 ms — h2https://evs.aayinltcs.arduino.cc/analytics-next/bundles/tsub-middleware.bundle.d94be5c4b3baf7f16aa2.jsevs.aayinltcs.arduino.cc/analytics-... https://evs.aayinltcs.arduino.cc/analytics-next/bundles/tsub-middleware.bundle.d94be5c4b3baf7f16aa2.js — 200 — 6.3 KiB — 23 ms — h2https://content.arduino.cc/assets/16-9.webmcontent.arduino.cc/assets/16-9.webm https://content.arduino.cc/assets/16-9.webm — 206 — 5.3 MiB — 49 ms — h3https://evs.aayinltcs.arduino.cc/analytics-next/bundles/ajs-destination.bundle.8e6b895db75187c55313.jsevs.aayinltcs.arduino.cc/analytics-... https://evs.aayinltcs.arduino.cc/analytics-next/bundles/ajs-destination.bundle.8e6b895db75187c55313.js — 200 — 3.5 KiB — 20 ms — h2https://evs.aayinltcs.arduino.cc/analytics-next/bundles/schemaFilter.bundle.1b218d13fed021531d4e.jsevs.aayinltcs.arduino.cc/analytics-... https://evs.aayinltcs.arduino.cc/analytics-next/bundles/schemaFilter.bundle.1b218d13fed021531d4e.js — 200 — 1.3 KiB — 21 ms — h2https://cdn.iubenda.com/cookie_solution/iubenda_cs/1.98.0/core-en.jscdn.iubenda.com/cookie_solution/iub... https://cdn.iubenda.com/cookie_solution/iubenda_cs/1.98.0/core-en.js — 200 — 110.8 KiB — 196 ms — h2https://www.google.com/recaptcha/api2/anchor?ar=1&k=6Le6eCgrAAAAAOW96UxCRhGi6ZmRnkAvbcmAuGs5&co=aHR0cHM6Ly93d3cuYXJkdWluby5jYzo0NDM.&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=ccxk1t4xvtodwww.google.com/recaptcha/api2/ancho... https://www.google.com/recaptcha/api2/anchor?ar=1&k=6Le6eCgrAAAAAOW96UxCRhGi6ZmRnkAvbcmAuGs5&co=aHR0cHM6Ly93d3cuYXJkdWluby5jYzo0NDM.&hl=en&v=gTpTIWhbKpxADzTzkcabhXN4&size=invisible&anchor-ms=20000&execute-ms=30000&cb=ccxk1t4xvtod — 200 — 27.6 KiB — 79 ms — h3data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNDIiIGhlaWdodD0iMjAiIHZpZXdCb3g9IjAgMCA0MiAyMCIgZmlsbD0ib…data:image/svg+xml;base64,PHN2ZyB3a... data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iNDIiIGhlaWdodD0iMjAiIHZpZXdCb3g9IjAgMCA0MiAyMCIgZmlsbD0ib… — 200 — 0 B — 0 ms — datahttps://www.arduino.cc/_next/static/css/90dfe282a754efa7.csswww.arduino.cc/_next/static/css/90d... https://www.arduino.cc/_next/static/css/90dfe282a754efa7.css — 200 — 0 B — 2 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.csswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.css — 200 — 42.1 KiB — 104 ms — h2https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 361.9 KiB — 167 ms — h2https://idb.iubenda.com/csdata?db=hits1idb.iubenda.com/csdata?db=hits1 https://idb.iubenda.com/csdata?db=hits1 — 204 — 574 B — 161 ms — h2https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4www.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 — 200 — 23 B — 198 ms — h3https://www.gstatic.com/recaptcha/api2/logo_48.pngwww.gstatic.com/recaptcha/api2/logo... https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.3 KiB — 25 ms — h2https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 33.9 KiB — 74 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 20 ms — h2https://cdn.arduino.cc/header-footer/prod/assets/favicon-arduino/favicon.icocdn.arduino.cc/header-footer/prod/a... https://cdn.arduino.cc/header-footer/prod/assets/favicon-arduino/favicon.ico — 200 — 6.2 KiB — 35 ms — h3https://sgtm.arduino.cc/g/collect?v=2&tid=G-NEXN8H46L5&gtm=45je64k0h2v887407625z8812394649za20gzb812394649zd812394649&_p=1776802367670&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&ecid=1682331894&_fplc=0&are=1&cid=21485405.1776802370&frm=0&gtm_up=1&pscdl=denied&rcb=5&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&ur=ES-MD&sst.rnd=1976317730.1776802370&sst.etld=google.es&sst.gcsub=region1&sst.adr=1&sst.tft=1776802367670&sst.lpc=93500365&sst.navt=n&sst.ude=0&_s=1&tag_exp=0~115938466~115938468~117266401~117512543&dl=https%3A%2F%2Fwww.arduino.cc%2F&dr=&sid=1776802368&sct=1&seg=0&dt=Arduino%20-%20Home&_tu=DA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.visitor_type=guest&ep.content_group=home&ep.event_id=1776802575546_17768027638774&ep.measurement_id=G-NEXN8H46L5&tfd=2969&richsstssesgtm.arduino.cc/g/collect?v=2&tid=G... https://sgtm.arduino.cc/g/collect?v=2&tid=G-NEXN8H46L5&gtm=45je64k0h2v887407625z8812394649za20gzb812394649zd812394649&_p=1776802367670&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&ecid=1682331894&_fplc=0&are=1&cid=21485405.1776802370&frm=0&gtm_up=1&pscdl=denied&rcb=5&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&ur=ES-MD&sst.rnd=1976317730.1776802370&sst.etld=google.es&sst.gcsub=region1&sst.adr=1&sst.tft=1776802367670&sst.lpc=93500365&sst.navt=n&sst.ude=0&_s=1&tag_exp=0~115938466~115938468~117266401~117512543&dl=https%3A%2F%2Fwww.arduino.cc%2F&dr=&sid=1776802368&sct=1&seg=0&dt=Arduino%20-%20Home&_tu=DA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.visitor_type=guest&ep.content_group=home&ep.event_id=1776802575546_17768027638774&ep.measurement_id=G-NEXN8H46L5&tfd=2969&richsstsse — 200 — 264 B — 97 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=8&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.arduino.cc%2F&scrsrc=www.googletagmanager.com&rnd=1976317730.1776802370&navt=n&npa=1&ep.ads_data_redaction=1&_tu=CA&gtm=45He64k0h2v812394649za200zd812394649xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938468~117266400~117884344&apve=1&apvf=f&apvc=1&tft=1776802370374&tfd=2971pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=8&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.arduino.cc%2F&scrsrc=www.googletagmanager.com&rnd=1976317730.1776802370&navt=n&npa=1&ep.ads_data_redaction=1&_tu=CA&gtm=45He64k0h2v812394649za200zd812394649xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938468~117266400~117884344&apve=1&apvf=f&apvc=1&tft=1776802370374&tfd=2971 — 200 — 21 B — 72 ms — h3
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 1183ms · 524KB · €21/mo
www.gstatic.com
Other
Costly
Execution 287ms
Transfer 0 KB
Unused 49%
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 284ms
Transfer 0 KB
Monthly Cost €5/mo
www.arduino.cc
Other
Optional
Execution 164ms
Transfer 70 KB
Monthly Cost €3/mo
www.arduino.cc
Other
Optional
Execution 140ms
Transfer 45 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 131ms
Transfer 199 KB
Unused 26%
Monthly Cost €2/mo
www.arduino.cc
Other
Optional
Execution 95ms
Transfer 36 KB
Unused 59%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 81ms
Transfer 174 KB
Unused 40%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 287ms and costs ~€5/month
  • Unattributable adds 284ms and costs ~€5/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.gstatic.com takes 287ms 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 284ms 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

59% of www.arduino.cc'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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