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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
3
PASS
8
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.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.31 s

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

8.55 s

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

734 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.

5.12 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.

11.87 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 3 REVIEW 4 FIX
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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2759ms total JS execution
FIX
2759ms total JS execution
Warning::
https://www.adafruit.com/: 599ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DRGH...: 500ms CPU time
Warning::
Unattributable: 469ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PRP...: 358ms CPU time
Warning::
https://www.googletagmanager.com/gtag/destination?...: 338ms CPU time
Warning::
Third-party scripts: 2759ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 17% Style & Layout 16% Script Parsing & Compilation 12% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.adafruit.com/599ms24ms6ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DRGH4QPNZS&cx=c&gtm=4e64h1500ms389ms75ms3rd
Unattributable469ms26ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PRPXBQ6358ms263ms66ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-1014834932&cx=c&gtm=4e64h1338ms268ms67ms3rd
https://connect.facebook.net/en_US/fbevents.js195ms144ms50ms3rd
https://connect.facebook.net/signals/config/1720153058307192?v=2.9.303&r=stable&domain=www.adafruit.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168137ms111ms25ms3rd
https://www.adafruit.com/includes/javascript/jquery.min.js106ms83ms14ms3rd
https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.min.525bbb13c4.js56ms42ms2ms3rd
D
Page Weight Inventory
Action
42 resources · 1.8 MB · 236 KB savings available
FIX
42 resources · 1.8 MB · 236 KB savings available
Warning::
Page weight 835 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~236 KB of savings available
Warning::
41 third-party resources (100% of weight)
Info::
1 resources over 200KB
42 resources · 1.8 MiB · 41 third-party 835.4 KiB over 1MB target
Image 51% · 950.8 KiB
JavaScript 37% · 686.4 KiB
Font 8% · 139.7 KiB
CSS 4% · 69.9 KiB
Document 1% · 11.4 KiB
Other 0% · 1.3 KiB

~235.7 KiB of savings available

Remove unused JavaScript: 235.7 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.

C
Page Weight Budget
Action
1.8 MB transferred, 42 requests
REVIEW
1.8 MB transferred, 42 requests
Info::
Page weighs 3.6 MB (1.8 MB transferred)
Warning::
JavaScript is 686 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 686 KB
Info::
42 HTTP requests
Info::
Estimated 0.38 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
42 requests
0.38 g CO2 per page load
Images 949.2 KiB 51%
JavaScript 686.4 KiB 37%
Fonts 139.7 KiB 8%
CSS 69.9 KiB 4%
HTML 11.4 KiB 1%
Other 1.7 KiB 0%
Other 612 B 0%
Other 559 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://cdn-learn.adafruit.com/groups/images/000/0... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 949 KB
0 oversized -0 KB
16 legacy format
1 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

C
JS Bundles
Action
11 scripts, 236 KB unused
REVIEW
11 scripts, 236 KB unused
Warning::
https://www.googletagmanager.com/gtag/destination?...: 70 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DRGH...: 66 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PRP...: 64 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 35 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 236 KB
236 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/destination?id=AW-1014834932&cx=c&gtm=4e64h1160 KB70 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-DRGH4QPNZS&cx=c&gtm=4e64h1174 KB66 KB (38%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PRPXBQ6150 KB64 KB (43%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB35 KB (37%)✓3rd
https://www.adafruit.com/includes/javascript/jquery.min.js31 KB—✓3rd
https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.lib.min.a813855f2b.js13 KB—✓3rd
https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.min.525bbb13c4.js3 KB—✓3rd
https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.modules.min.838b473faf.js13 KB—✓3rd
https://www.adafruit.com/includes/templates/shop2019/jscript/lite-yt-embed.js4 KB—✗3rd
https://connect.facebook.net/signals/config/1720153058307192?v=2.9.303&r=stable&domain=www.adafruit.com&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16839 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

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
4 fonts (140 KB)
PASS
4 fonts (140 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

140 KB total

Render-blocking

0

of 4

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 FCP 3.3 s LCP 8.5 shttps://cdn-shop.adafruit.com/fonts/proximanova/proximanova-regular-webfont.woff2proximanova-regular-web... https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-regular-webfont.woff2 — 21.7 KiB — 27 ms — font-display: swaphttps://cdn-shop.adafruit.com/fonts/proximanova/proximanova-semibold-webfont.woff2proximanova-semibold-we... https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-semibold-webfont.woff2 — 21.4 KiB — 28 ms — font-display: swaphttps://www.adafruit.com/includes/templates/shop2019/css/font-awesome-4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://www.adafruit.com/includes/templates/shop2019/css/font-awesome-4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.5 KiB — 19 ms — font-display: swaphttps://cdn-shop.adafruit.com/fonts/proximanova/proximanova-light-webfont.woff2proximanova-light-webfo... https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-light-webfont.woff2 — 21.1 KiB — 13 ms — font-display: swap
proximanova-regular-web... woff2 swap
Size 22 KB
Load time 27 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
proximanova-semibold-we... woff2 swap
Size 21 KB
Load time 28 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 19 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
proximanova-light-webfo... woff2 swap
Size 21 KB
Load time 13 ms
Start 2.6 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
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
42 requests over 3332ms
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 FCP 3.3 s LCP 8.5 shttps://adafruit.com// https://adafruit.com/ — 301 — 159 B — 742 ms — h2https://www.adafruit.com/www.adafruit.com/ https://www.adafruit.com/ — 200 — 11.4 KiB — 943 ms — h2https://www.adafruit.com/includes/templates/shop2019/css/bootstrap.csswww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/css/bootstrap.css — 200 — 16.3 KiB — 717 ms — h2https://www.adafruit.com/includes/templates/shop2019/css/font-awesome-4.7.0/css/font-awesome.min.csswww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/css/font-awesome-4.7.0/css/font-awesome.min.css — 200 — 6.9 KiB — 21 ms — h2https://www.adafruit.com/includes/javascript/jquery.min.jswww.adafruit.com/includes/javascrip... https://www.adafruit.com/includes/javascript/jquery.min.js — 200 — 31.2 KiB — 23 ms — h2https://www.adafruit.com/includes/templates/shop2019/css/style.33e669f222.csswww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/css/style.33e669f222.css — 200 — 46.6 KiB — 30 ms — h2https://cdn-shop.adafruit.com/heroes/adafruit_JPPPoW_hero.jpgcdn-shop.adafruit.com/heroes/adafru... https://cdn-shop.adafruit.com/heroes/adafruit_JPPPoW_hero.jpg — 200 — 84.0 KiB — 30 ms — h2https://cdn-shop.adafruit.com/content_cards/test_content_card.jpgcdn-shop.adafruit.com/content_cards... https://cdn-shop.adafruit.com/content_cards/test_content_card.jpg — 200 — 50.6 KiB — 787 ms — h2https://cdn-shop.adafruit.com/home-ads/20250317-124421-12.jpgcdn-shop.adafruit.com/home-ads/2025... https://cdn-shop.adafruit.com/home-ads/20250317-124421-12.jpg — 200 — 19.2 KiB — 11 ms — h2https://cdn-shop.adafruit.com/heroes/bluefruit_wireless.jpgcdn-shop.adafruit.com/heroes/bluefr... https://cdn-shop.adafruit.com/heroes/bluefruit_wireless.jpg — 200 — 96.3 KiB — 17 ms — h2https://cdn-learn.adafruit.com/groups/images/000/000/027/original/Wrist_Mounted_Explore.png?1649364863cdn-learn.adafruit.com/groups/image... https://cdn-learn.adafruit.com/groups/images/000/000/027/original/Wrist_Mounted_Explore.png?1649364863 — 200 — 643.9 KiB — 74 ms — h2https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.lib.min.a813855f2b.jswww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.lib.min.a813855f2b.js — 200 — 13.2 KiB — 14 ms — h2https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.min.525bbb13c4.jswww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.min.525bbb13c4.js — 200 — 2.9 KiB — 715 ms — h2https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.modules.min.838b473faf.jswww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/dist/adafruit_shop.modules.min.838b473faf.js — 200 — 12.8 KiB — 20 ms — h2https://www.adafruit.com/includes/templates/shop2019/jscript/lite-yt-embed.jswww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/jscript/lite-yt-embed.js — 200 — 4.1 KiB — 18 ms — h2https://www.adafruit.com/includes/templates/shop2019/images/adafruit_logo_small.pngwww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/images/adafruit_logo_small.png — 200 — 1.0 KiB — 14 ms — h2https://www.adafruit.com/includes/templates/shop2019/images/adafruit-logo.pngwww.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/images/adafruit-logo.png — 200 — 1.2 KiB — 15 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PRPXBQ6www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PRPXBQ6 — 200 — 150.1 KiB — 36 ms — h2https://cdn-shop.adafruit.com/310x233/6498-00.jpgcdn-shop.adafruit.com/310x233/6498-... https://cdn-shop.adafruit.com/310x233/6498-00.jpg — 200 — 14.8 KiB — 11 ms — h2https://cdn-shop.adafruit.com/310x233/6491-00.jpgcdn-shop.adafruit.com/310x233/6491-... https://cdn-shop.adafruit.com/310x233/6491-00.jpg — 200 — 14.3 KiB — 14 ms — h2https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-regular-webfont.woff2cdn-shop.adafruit.com/fonts/proxima... https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-regular-webfont.woff2 — 200 — 21.7 KiB — 27 ms — h2https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-semibold-webfont.woff2cdn-shop.adafruit.com/fonts/proxima... https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-semibold-webfont.woff2 — 200 — 21.4 KiB — 28 ms — h2https://www.adafruit.com/includes/templates/shop2019/css/font-awesome-4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0www.adafruit.com/includes/templates... https://www.adafruit.com/includes/templates/shop2019/css/font-awesome-4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 200 — 75.5 KiB — 19 ms — h2https://cdn-shop.adafruit.com/310x233/6407-05.jpgcdn-shop.adafruit.com/310x233/6407-... https://cdn-shop.adafruit.com/310x233/6407-05.jpg — 200 — 15.6 KiB — 11 ms — h2https://cdn-shop.adafruit.com/310x233/6354-06.jpgcdn-shop.adafruit.com/310x233/6354-... https://cdn-shop.adafruit.com/310x233/6354-06.jpg — 200 — 7.4 KiB — 737 ms — h2https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-light-webfont.woff2cdn-shop.adafruit.com/fonts/proxima... https://cdn-shop.adafruit.com/fonts/proximanova/proximanova-light-webfont.woff2 — 200 — 21.1 KiB — 13 ms — h2https://www.googletagmanager.com/gtag/js?id=G-DRGH4QPNZS&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-DRGH4QPNZS&cx=c&gtm=4e64h1 — 200 — 174.3 KiB — 42 ms — h2https://connect.facebook.net/en_US/fbevents.jsconnect.facebook.net/en_US/fbevents... https://connect.facebook.net/en_US/fbevents.js — 200 — 96.6 KiB — 35 ms — h3https://www.google.com/ccm/collect?rcb=18&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.adafruit.com%2F&scrsrc=www.googletagmanager.com&rnd=1387194484.1776811214&dt=Adafruit%20Industries%2C%20Unique%20%26%20fun%20DIY%20electronics%20and%20kits&auid=1727739369.1776811214&navt=n&npa=0&ep.ads_data_redaction=0&gtm=45He64h1v77009469za200zd77009469xea&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938468~117266400&apve=1&apvf=f&apvc=1&tft=1776811213654&tfd=2732www.google.com/ccm/collect?rcb=18&f... 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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 2759ms · 666KB · $16/mo
www.adafruit.com
Other
Costly
Execution 599ms
Transfer 11 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 500ms
Transfer 174 KB
Unused 38%
Monthly Cost $3/mo
Unattributable
Other
Costly
Execution 469ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 358ms
Transfer 150 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 338ms
Transfer 160 KB
Unused 43%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 195ms
Transfer 97 KB
Unused 37%
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 137ms
Transfer 39 KB
Monthly Cost $1/mo
www.adafruit.com
Other
Optional
Execution 106ms
Transfer 31 KB
Monthly Cost $1/mo
www.adafruit.com
Other
Optional
Execution 56ms
Transfer 3 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • www.adafruit.com adds 599ms and costs ~$3/month
  • Google Tag Manager adds 500ms and costs ~$3/month
  • Unattributable adds 469ms and costs ~$3/month
  • Google Tag Manager adds 358ms and costs ~$2/month
  • Google Tag Manager adds 338ms and costs ~$2/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.adafruit.com takes 599ms 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 500ms 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 469ms 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 358ms 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 338ms 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

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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