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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
4
REVIEW
1
PASS
10
INFO
2

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

Mobile Desktop
52
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

1.40 s

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

11.43 s

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

727 ms

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

0.011

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

5.87 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.

20.60 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
10 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
3.9 MB transferred, 75 requests
FIX
3.9 MB transferred, 75 requests
Warning::
Page weighs 6.7 MB (3.9 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
Fonts are 595 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 595 KB
Info::
75 HTTP requests
Info::
Estimated 0.82 g CO2 per page load
3.9 MB / 2.4 MB budget
3.9 MB transferred
75 requests
0.82 g CO2 per page load
Images 2.2 MiB 55%
JavaScript 1.1 MiB 28%
Fonts 594.8 KiB 15%
CSS 37.6 KiB 1%
HTML 21.4 KiB 1%
Other 5.6 KiB 0%
Other 1.2 KiB 0%
Other 1.2 KiB 0%
Other 550 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

F
JS Execution Cost
Action
3527ms total JS execution
FIX
3527ms total JS execution
Warning::
https://cleantechnica.com/: 710ms CPU time
Warning::
Unattributable: 410ms CPU time
Warning::
https://pagead2.googlesyndication.com/pagead/js/ad...: 323ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BRWN...: 323ms CPU time
Warning::
https://fundingchoicesmessages.google.com/f/AGSKWx...: 267ms CPU time
Warning::
Third-party scripts: 2369ms (67% of total)

Main Thread Breakdown

Script Evaluation 53% Other 14% Style & Layout 13% Script Parsing & Compilation 13% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://cleantechnica.com/710ms59ms8ms1st
Unattributable410ms36ms0ms3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1552008901061842323ms147ms129ms3rd
https://www.googletagmanager.com/gtag/js?id=G-BRWNS0TK1P323ms265ms46ms3rd
https://fundingchoicesmessages.google.com/f/AGSKWxWiFy_wyQAJCX8Z1f29af52LhvFl70U_isvU-3ggGlaot1yueHJVvsq3TFhpXHHuYiQwVzcnX8k9ngVwbrBfz5GSBYfXChxYvE1vINVhiW5gXLKPNyrPxZ2CamdxX1-TB4m2x9O?fccs=W251bGwsbnVsbCxudWxsLG51bGwsbnVsbCxudWxsLFsxNzc2ODkwNzI2LDQ3OTAwMDAwMF0sbnVsbCxudWxsLG51bGwsW251bGwsWzddXSwiaHR0cHM6Ly9jbGVhbnRlY2huaWNhLmNvbS8iLG51bGwsW1s4LCJwU0prbzE5NklIMCJdLFs5LCJlbi1VUyJdLFsxOCwiW1tbbnVsbCw4MzhdXV0iXSxbMzUsIjE3NzY4OTA3MjYiXSxbMTksIjEiXSxbMTcsIlswXSJdLFsyNCwiIl0sWzI5LCJmYWxzZSJdXV0267ms137ms38ms3rd
https://cleantechnica.com/cdn-cgi/challenge-platform/scripts/jsd/main.js263ms252ms2ms1st
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js235ms166ms65ms3rd
https://connect.facebook.net/en_US/fbevents.js228ms175ms52ms3rd
https://cleantechnica.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1185ms140ms7ms1st
https://fundingchoicesmessages.google.com/i/ca-pub-1552008901061842?href=https%3A%2F%2Fcleantechnica.com&ers=2183ms164ms17ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
33 scripts, 514 KB unused
FIX
33 scripts, 514 KB unused
Warning::
https://pagead2.googlesyndication.com/pagead/manag...: 148 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-184...: 90 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-184...: 65 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BRWN...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/bundle/sdk.js/: 55 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 514 KB
514 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://pagead2.googlesyndication.com/pagead/managed/js/adsense/m202604170101/show_ads_impl_fy2021.js178 KB148 KB (83%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-18444479-1&cx=c&gtm=4e64k0116 KB90 KB (78%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-18444479-1116 KB65 KB (57%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-BRWNS0TK1P156 KB65 KB (42%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB55 KB (71%)✓3rd
https://fundingchoicesmessages.google.com/i/ca-pub-1552008901061842?href=https%3A%2F%2Fcleantechnica.com&ers=270 KB36 KB (52%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (35%)✓3rd
https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-155200890106184255 KB22 KB (39%)✓3rd
https://cleantechnica.com/wp-content/themes/colormag-pro/assets/js/skip-link-focus-fix.min.js?ver=4.1.20 KB—✓1st
https://connect.facebook.net/signals/config/1020645035249848?v=2.9.303&r=stable&domain=cleantechnica.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%2C16845 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

D
Page Weight Inventory
Action
75 resources · 3.9 MB · 514 KB savings available
FIX
75 resources · 3.9 MB · 514 KB savings available
Warning::
Page weight 2.9 MB over 1MB target
Got: 3.9 MB Expected: ≤ 1 MB
Info::
~514 KB of savings available
Info::
40 third-party resources (34% of weight)
Info::
5 resources over 200KB
75 resources · 3.9 MiB · 40 third-party 2.9 MiB over 1MB target
Image 56% · 2.2 MiB
JavaScript 28% · 1.1 MiB
Font 15% · 594.8 KiB
CSS 1% · 37.6 KiB
Document 1% · 21.9 KiB
Other 0% · 2.9 KiB

~514.5 KiB of savings available

Remove unused JavaScript: 514.5 KiB
C
Image Optimization
Action
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
https://static.shareasale.com/image/108816/US00336... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cleantechnica.com/wp-content/uploads/2023/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17 images 2.2 MB
0 oversized -0 KB
10 legacy format
2 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

A
Third-Party Impact
34% third-party, 0 ms blocking
PASS
34% third-party, 0 ms blocking
Info::
Third-party code accounts for 34% of page weight (1.3 MiB of 3.9 MiB)
Info::
Third-party blocking time is low (0 ms)
66%
34%
First-party Third-party
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
8 fonts (595 KB)
PASS
8 fonts (595 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

595 KB total

Render-blocking

0

of 8

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 1.4 s LCP 11.4 shttps://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-VariableFont.woffOpenSans-VariableFont.woff https://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-VariableFont.woff — 78.5 KiB — 25 ms — font-display: swaphttps://cleantechnica.com/wp-content/themes/colormag-pro/assets/library/fontawesome/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://cleantechnica.com/wp-content/themes/colormag-pro/assets/library/fontawesome/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.6 KiB — 25 ms — font-display: swaphttps://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-Italic.woffOpenSans-Italic.woff https://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-Italic.woff — 82.3 KiB — 37 ms — font-display: swaphttps://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-Medium.woffOpenSans-Medium.woff https://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-Medium.woff — 78.9 KiB — 51 ms — font-display: swaphttps://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-SemiBold.woffOpenSans-SemiBold.woff https://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-SemiBold.woff — 78.5 KiB — 51 ms — font-display: swaphttps://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-SemiBoldItalic.woffOpenSans-SemiBoldItalic... https://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-SemiBoldItalic.woff — 82.4 KiB — 56 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.1 KiB — 96 ms — font-display: swaphttps://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-Bold.woffOpenSans-Bold.woff https://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-Bold.woff — 76.5 KiB — 16 ms — font-display: swap
OpenSans-VariableFont.woff woff swap
Size 79 KB
Load time 25 ms
Start 211 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 25 ms
Start 212 ms
Risk FOUT — text flashes from fallback to web font
OpenSans-Italic.woff woff swap
Size 82 KB
Load time 37 ms
Start 314 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-Medium.woff woff swap
Size 79 KB
Load time 51 ms
Start 315 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-SemiBold.woff woff swap
Size 79 KB
Load time 51 ms
Start 315 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
OpenSans-SemiBoldItalic... woff swap
Size 82 KB
Load time 56 ms
Start 316 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 96 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
OpenSans-Bold.woff woff swap
Size 77 KB
Load time 16 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~143 KB and ~286 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
1
prefetch
—

1 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

A
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600, must-revalidate
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=600, must-revalidate

DirectiveValueMeaning
max-age600Cache for 10 minutes
must-revalidate—Must recheck with server after expiry
Effective TTL: 600 seconds
Network Waterfall
75 requests over 1359ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 1.4 s LCP 11.4 shttps://cleantechnica.com// https://cleantechnica.com/ — 200 — 21.4 KiB — 242 ms — h2https://cleantechnica.com/wp-content/themes/colormag-pro/style.css?ver=4.1.2/wp-content/themes/colormag-pro/sty... https://cleantechnica.com/wp-content/themes/colormag-pro/style.css?ver=4.1.2 — 200 — 24.0 KiB — 23 ms — h2https://cleantechnica.com/wp-content/themes/colormag-pro/assets/library/fontawesome/css/font-awesome.min.css?ver=4.1.2/wp-content/themes/colormag-pro/ass... https://cleantechnica.com/wp-content/themes/colormag-pro/assets/library/fontawesome/css/font-awesome.min.css?ver=4.1.2 — 200 — 6.9 KiB — 26 ms — h2https://cleantechnica.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1/wp-includes/js/jquery/jquery.min.j... https://cleantechnica.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 30.9 KiB — 26 ms — h2https://cleantechnica.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1/wp-includes/js/jquery/jquery-migra... https://cleantechnica.com/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.0 KiB — 17 ms — h2https://cleantechnica.com/wp-content/uploads/2023/06/CleanTechnica_logo_crop.webp/wp-content/uploads/2023/06/CleanTe... https://cleantechnica.com/wp-content/uploads/2023/06/CleanTechnica_logo_crop.webp — 200 — 7.7 KiB — 24 ms — h2https://www.googletagmanager.com/gtag/js?id=G-BRWNS0TK1Pwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-BRWNS0TK1P — 200 — 155.9 KiB — 158 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-18444479-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-18444479-1 — 200 — 115.6 KiB — 184 ms — h2https://chimpstatic.com/mcjs-connected/js/users/a897522b53d0853c85abbf9fa/dc3aadab652d5052372f586b1.jschimpstatic.com/mcjs-connected/js/u... https://chimpstatic.com/mcjs-connected/js/users/a897522b53d0853c85abbf9fa/dc3aadab652d5052372f586b1.js — -1 — 0 B — 51 ms — 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https://fundingchoicesmessages.google.com/el/AGSKWxXkuMasKxzEICkb0Y3TowEi30Cgu6igO7840rgKBubM9WQ1TSA3Nw5SkhAw4vraH1qQwx2qwjd5v9CNbZ0Bgql_fof362LqTkdHLQjlpr53qxwD0PmdhTeFjkg-C8pZ8QQla5Dk — 204 — 28 B — 32 ms — h3https://fundingchoicesmessages.google.com/el/AGSKWxXkuMasKxzEICkb0Y3TowEi30Cgu6igO7840rgKBubM9WQ1TSA3Nw5SkhAw4vraH1qQwx2qwjd5v9CNbZ0Bgql_fof362LqTkdHLQjlpr53qxwD0PmdhTeFjkg-C8pZ8QQla5Dkfundingchoicesmessages.google.com/e... https://fundingchoicesmessages.google.com/el/AGSKWxXkuMasKxzEICkb0Y3TowEi30Cgu6igO7840rgKBubM9WQ1TSA3Nw5SkhAw4vraH1qQwx2qwjd5v9CNbZ0Bgql_fof362LqTkdHLQjlpr53qxwD0PmdhTeFjkg-C8pZ8QQla5Dk — 204 — 28 B — 30 ms — h3https://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-Bold.woff/wp-content/themes/colormag-pro/ass... https://cleantechnica.com/wp-content/themes/colormag-pro/assets/fonts/OpenSans-Bold.woff — 200 — 76.5 KiB — 16 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
67% of JavaScript execution is third-party
First-party Third-party 2369ms · 898KB · $31/mo
Unattributable
Other
Costly
Execution 410ms
Transfer 0 KB
Monthly Cost $5/mo
pagead2.googlesyndication.com
Other
Costly
Execution 323ms
Transfer 55 KB
Unused 39%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 323ms
Transfer 156 KB
Unused 42%
Monthly Cost $4/mo
fundingchoicesmessages.google.com
Other
Costly
Execution 267ms
Transfer 68 KB
Monthly Cost $4/mo
pagead2.googlesyndication.com
Other
Costly
Execution 235ms
Transfer 178 KB
Unused 83%
Monthly Cost $3/mo
Facebook Pixel
Advertising
Costly
Execution 228ms
Transfer 97 KB
Unused 35%
Monthly Cost $3/mo
fundingchoicesmessages.google.com
Other
Optional
Execution 183ms
Transfer 70 KB
Unused 52%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 134ms
Transfer 45 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 114ms
Transfer 116 KB
Unused 57%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 80ms
Transfer 78 KB
Unused 71%
Monthly Cost $1/mo
confesschairs.com
Other
Optional
Execution 70ms
Transfer 36 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 410ms and costs ~$5/month
  • pagead2.googlesyndication.com adds 323ms and costs ~$4/month
  • Google Tag Manager adds 323ms and costs ~$4/month
  • fundingchoicesmessages.google.com adds 267ms and costs ~$4/month
  • pagead2.googlesyndication.com adds 235ms and costs ~$3/month
  • Facebook Pixel adds 228ms and costs ~$3/month

67% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 410ms 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

pagead2.googlesyndication.com takes 323ms 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 323ms 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

fundingchoicesmessages.google.com takes 267ms 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

pagead2.googlesyndication.com takes 235ms 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

83% of pagead2.googlesyndication.com'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

Facebook Pixel takes 228ms 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

52% of fundingchoicesmessages.google.com'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

57% of Google Tag Manager'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

71% of Facebook Pixel'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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