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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
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.

11.43 s

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

58.67 s

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

665 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.

11.43 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.

58.80 s

Page Load Progression

643 ms
1.3 s
1.9 s
2.6 s
3.2 s
3.9 s
4.5 s
5.1 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
10.7 MB transferred, 98 requests
FIX
10.7 MB transferred, 98 requests
Critical::
Page weighs 15.0 MB (10.7 MB transferred)
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
Info::
98 HTTP requests
Info::
Estimated 2.3 g CO2 per page load
10.7 MB / 2.4 MB budget
10.7 MB transferred
98 requests
2.3 g CO2 per page load
Other 8.3 MiB 77%
JavaScript 1.6 MiB 15%
Images 461.4 KiB 4%
Fonts 171.3 KiB 2%
CSS 100.8 KiB 1%
HTML 97.5 KiB 1%
Other 32.4 KiB 0%
Other 8.7 KiB 0%
Other 573 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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 (10.7 MiB of 10.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3785ms total JS execution
FIX
3785ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 787ms CPU time
Warning::
https://www.arduino.cc/: 622ms CPU time
Warning::
Unattributable: 565ms CPU time
Warning::
https://www.arduino.cc/_next/static/chunks/framewo...: 559ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NK2...: 448ms CPU time
Warning::
Third-party scripts: 3785ms (100% of total)

Main Thread Breakdown

Script Evaluation 57% Other 22% Script Parsing & Compilation 9% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js787ms644ms99ms3rd
https://www.arduino.cc/622ms7ms1ms3rd
Unattributable565ms65ms0ms3rd
https://www.arduino.cc/_next/static/chunks/framework-f00fddb9800f9292.js559ms490ms13ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NK2TW8L448ms362ms57ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NEXN8H46L5&cx=c&gtm=4e64h1289ms231ms44ms3rd
https://cdn.iubenda.com/cookie_solution/iubenda_cs/1.98.0/core-en.js210ms131ms49ms3rd
https://www.arduino.cc/_next/static/chunks/pages/%5B%5B...slug%5D%5D-97c74d60bdea974f.js138ms134ms4ms3rd
https://www.arduino.cc/_next/static/chunks/main-695e353efc0a2998.js107ms89ms16ms3rd
https://www.arduino.cc/_next/static/chunks/pages/_app-6c6282e55ed0056f.js59ms32ms18ms3rd
F
JS Bundles
Action
39 scripts, 806 KB unused
FIX
39 scripts, 806 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...: 71 KB unused (41%)
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: 806 KB
806 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=4e64h1174 KB71 KB (41%)✓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-NK2TW8L200 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/9575-5ded90c66ba306b0.js36 KB26 KB (75%)✓3rd
https://www.arduino.cc/_next/static/chunks/9104-95c6abddeae501c7.js36 KB22 KB (61%)✓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
98 resources · 10.7 MB · 806 KB savings available
FIX
98 resources · 10.7 MB · 806 KB savings available
Warning::
Page weight 9.7 MB over 1MB target
Got: 10.7 MB Expected: ≤ 1 MB
Info::
~806 KB of savings available
Warning::
91 third-party resources (100% of weight)
Info::
4 resources over 200KB
98 resources · 10.7 MiB · 91 third-party 9.7 MiB over 1MB target
Media 77% · 8.3 MiB
JavaScript 15% · 1.6 MiB
Image 4% · 467.5 KiB
Font 2% · 171.3 KiB
CSS 1% · 100.8 KiB
Document 1% · 97.5 KiB
Other 0% · 35.4 KiB

~805.7 KiB of savings available

Remove unused JavaScript: 805.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Info::
All images are well-optimized
13 images 461 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
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 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s FCP 11.4 s LCP 58.7 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 — 150 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 — 130 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 — 165 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 — 168 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 — 179 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 — 181 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 80 ms — font-display: swap
Roboto-Mono-Bold-webfon... woff swap
Size 27 KB
Load time 150 ms
Start 155 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 130 ms
Start 156 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 165 ms
Start 156 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 168 ms
Start 157 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 179 ms
Start 157 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 181 ms
Start 157 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 80 ms
Start 1.3 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
19 hints, 0 missing preconnects
PASS
19 hints, 0 missing preconnects
Info::
Page uses 19 resource hint(s)

Current Resource Hints

preconnect
6
preload
+3
13
dns-prefetch
—
prefetch
—

19 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
98 requests over 2838ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s FCP 11.4 s LCP 58.7 shttps://arduino.cc// https://arduino.cc/ — 301 — 297 B — 61 ms — h2https://www.arduino.cc/www.arduino.cc/ https://www.arduino.cc/ — 200 — 69.9 KiB — 97 ms — h2https://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 — 150 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 — 130 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 — 165 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 — 168 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 — 179 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 — 181 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 — 107 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 — 61 ms — h2https://www.arduino.cc/_next/static/css/90dfe282a754efa7.csswww.arduino.cc/_next/static/css/90d... https://www.arduino.cc/_next/static/css/90dfe282a754efa7.css — 200 — 1.8 KiB — 36 ms — h2https://www.arduino.cc/_next/static/css/2f39f2f3537629df.csswww.arduino.cc/_next/static/css/2f3... https://www.arduino.cc/_next/static/css/2f39f2f3537629df.css — 200 — 1.8 KiB — 37 ms — h2https://www.arduino.cc/_next/static/css/c924c4baaad337e3.csswww.arduino.cc/_next/static/css/c92... https://www.arduino.cc/_next/static/css/c924c4baaad337e3.css — 200 — 482 B — 44 ms — h2https://www.arduino.cc/_next/static/css/1877494b167afcc1.csswww.arduino.cc/_next/static/css/187... https://www.arduino.cc/_next/static/css/1877494b167afcc1.css — 200 — 1.5 KiB — 37 ms — h2https://www.arduino.cc/_next/static/css/9ecf58cd11b16fa7.csswww.arduino.cc/_next/static/css/9ec... https://www.arduino.cc/_next/static/css/9ecf58cd11b16fa7.css — 200 — 1.0 KiB — 34 ms — h2https://www.arduino.cc/_next/static/css/4440a680f9832684.csswww.arduino.cc/_next/static/css/444... https://www.arduino.cc/_next/static/css/4440a680f9832684.css — 200 — 457 B — 37 ms — h2https://www.datocms-assets.com/150482/1738840518-iconrow.svgwww.datocms-assets.com/150482/17388... https://www.datocms-assets.com/150482/1738840518-iconrow.svg — 200 — 1.1 KiB — 147 ms — h2https://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 — 1021 B — 46 ms — h2https://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 — 4.2 KiB — 43 ms — h2https://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 — 2.3 KiB — 51 ms — h2https://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 — 48 ms — h2https://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 — 35.7 KiB — 78 ms — h2https://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 — 4.0 KiB — 44 ms — h2https://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 — 13.3 KiB — 51 ms — h2https://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 — 1.7 KiB — 54 ms — h2https://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 — 4.2 KiB — 67 ms — h2https://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 — 28.0 KiB — 76 ms — h2https://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 — 3.3 KiB — 57 ms — h2https://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 — 2.5 KiB — 55 ms — h2https://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 — 30.0 KiB — 60 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s FCP 11.4 s LCP 58.7 shttps://arduino.cc// https://arduino.cc/ — 301 — 297 B — 61 ms — h2https://www.arduino.cc/www.arduino.cc/ https://www.arduino.cc/ — 200 — 69.9 KiB — 97 ms — h2https://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 — 150 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 — 130 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 — 165 ms — 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https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1764063710-img.png — 301 — 370 B — 32 ms — h2https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1769011155-img.png/cdn-cgi/image/width=2048,quality=6... https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1769011155-img.png — 301 — 369 B — 31 ms — h2https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1738746652-opta.png/cdn-cgi/image/width=2048,quality=6... https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1738746652-opta.png — 301 — 370 B — 31 ms — h2https://arduino.cc/cdn-cgi/image/width=750,quality=60,format=auto/https://www.datocms-assets.com/150482/1758731542-hero-content-mobile.png/cdn-cgi/image/width=750,quality=60... https://arduino.cc/cdn-cgi/image/width=750,quality=60,format=auto/https://www.datocms-assets.com/150482/1758731542-hero-content-mobile.png — 301 — 380 B — 31 ms — h2https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1772726112-qualcomm-banner.png/cdn-cgi/image/width=2048,quality=6... https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1772726112-qualcomm-banner.png — 301 — 377 B — 31 ms — h2https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1761651540-qualcomarduino.svg/cdn-cgi/image/width=2048,quality=6... https://arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1761651540-qualcomarduino.svg — 301 — 377 B — 31 ms — h2https://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 — 31 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 — 51 ms — h3https://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 — 80 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 — 24 ms — h2https://www.arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1764063710-img.pngwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1764063710-img.png — 200 — 23.2 KiB — 80 ms — h3https://www.arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1769011155-img.pngwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1769011155-img.png — 200 — 37.8 KiB — 87 ms — h3https://www.arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1738746652-opta.pngwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1738746652-opta.png — 200 — 4.0 KiB — 79 ms — h3https://www.arduino.cc/cdn-cgi/image/width=750,quality=60,format=auto/https://www.datocms-assets.com/150482/1758731542-hero-content-mobile.pngwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=750,quality=60,format=auto/https://www.datocms-assets.com/150482/1758731542-hero-content-mobile.png — 200 — 18.4 KiB — 85 ms — h3https://www.arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1772726112-qualcomm-banner.pngwww.arduino.cc/cdn-cgi/image/width=... https://www.arduino.cc/cdn-cgi/image/width=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1772726112-qualcomm-banner.png — 200 — 3.2 KiB — 56 ms — h3https://www.arduino.cc/cdn-cgi/image/width=2048,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=2048,quality=60,format=auto/https://www.datocms-assets.com/150482/1761651540-qualcomarduino.svg — 200 — 4.5 KiB — 52 ms — h3https://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 — 36 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 — 0 B — 1 ms — h2https://sgtm.arduino.cc/g/collect?v=2&tid=G-NEXN8H46L5&gtm=45je64h1v887407625z8812394649za20gzb812394649zd812394649&_p=1776802347937&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&ecid=1498947062&_fplc=0&are=1&cid=1983326626.1776802350&frm=0&gtm_up=1&pscdl=denied&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&ur=ES-MD&sst.rnd=1096919793.1776802350&sst.etld=google.es&sst.gcsub=region1&sst.adr=1&sst.tft=1776802347937&sst.lpc=93500365&sst.navt=n&sst.ude=0&_s=1&tag_exp=0~115938466~115938468~117266400&dl=https%3A%2F%2Fwww.arduino.cc%2F&dr=&sid=1776802348&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=1776802494745_17768032941634&ep.measurement_id=G-NEXN8H46L5&tfd=2705&richsstssesgtm.arduino.cc/g/collect?v=2&tid=G... https://sgtm.arduino.cc/g/collect?v=2&tid=G-NEXN8H46L5&gtm=45je64h1v887407625z8812394649za20gzb812394649zd812394649&_p=1776802347937&gcs=G100&gcd=13p3pPp2p5l1&npa=1&dma_cps=-&dma=1&ecid=1498947062&_fplc=0&are=1&cid=1983326626.1776802350&frm=0&gtm_up=1&pscdl=denied&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&ur=ES-MD&sst.rnd=1096919793.1776802350&sst.etld=google.es&sst.gcsub=region1&sst.adr=1&sst.tft=1776802347937&sst.lpc=93500365&sst.navt=n&sst.ude=0&_s=1&tag_exp=0~115938466~115938468~117266400&dl=https%3A%2F%2Fwww.arduino.cc%2F&dr=&sid=1776802348&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=1776802494745_17768032941634&ep.measurement_id=G-NEXN8H46L5&tfd=2705&richsstsse — 200 — 292 B — 132 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=15&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.arduino.cc%2F&scrsrc=www.googletagmanager.com&rnd=1096919793.1776802350&navt=n&npa=1&ep.ads_data_redaction=1&_tu=CA&gtm=45He64h1v812394649za200zd812394649xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938469~117266401~117884344&apve=1&apvf=f&apvc=1&tft=1776802350340&tfd=2707pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=15&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.arduino.cc%2F&scrsrc=www.googletagmanager.com&rnd=1096919793.1776802350&navt=n&npa=1&ep.ads_data_redaction=1&_tu=CA&gtm=45He64h1v812394649za200zd812394649xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938469~117266401~117884344&apve=1&apvf=f&apvc=1&tft=1776802350340&tfd=2707 — 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 3785ms · 704KB · €66/mo
www.gstatic.com
Other
Costly
Execution 787ms
Transfer 0 KB
Unused 49%
Monthly Cost €14/mo
www.arduino.cc
Other
Costly
Execution 622ms
Transfer 70 KB
Monthly Cost €11/mo
Unattributable
Other
Costly
Execution 565ms
Transfer 0 KB
Monthly Cost €10/mo
www.arduino.cc
Other
Costly
Execution 559ms
Transfer 45 KB
Monthly Cost €10/mo
Google Tag Manager
Tag Manager
Costly
Execution 448ms
Transfer 200 KB
Unused 26%
Monthly Cost €8/mo
Google Tag Manager
Tag Manager
Costly
Execution 289ms
Transfer 174 KB
Unused 41%
Monthly Cost €5/mo
Iubenda
Consent
Essential
Execution 210ms
Transfer 111 KB
Unused 62%
Monthly Cost €4/mo
www.arduino.cc
Other
Optional
Execution 138ms
Transfer 10 KB
Monthly Cost €2/mo
www.arduino.cc
Other
Optional
Execution 107ms
Transfer 36 KB
Monthly Cost €2/mo
www.arduino.cc
Other
Optional
Execution 59ms
Transfer 58 KB
Unused 64%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 787ms and costs ~€14/month
  • www.arduino.cc adds 622ms and costs ~€11/month
  • Unattributable adds 565ms and costs ~€10/month
  • www.arduino.cc adds 559ms and costs ~€10/month
  • Google Tag Manager adds 448ms and costs ~€8/month
  • Google Tag Manager adds 289ms 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 787ms 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

www.arduino.cc takes 622ms 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 565ms 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

www.arduino.cc takes 559ms 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

Google Tag Manager takes 448ms 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

Google Tag Manager takes 289ms 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

62% of Iubenda'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

64% 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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