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https://speakerdeck.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
8
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.
93
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.
100
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.

3.89 s

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

4.19 s

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

1.34 s

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

0.005

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

3.89 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.

13.25 s

Page Load Progression

945 ms
1.9 s
2.8 s
3.8 s
4.7 s
5.7 s
6.6 s
7.6 s
Checks
17
8 PASS 3 REVIEW 4 FIX
D
Third-Party Impact
Action
96% third-party, 0 ms blocking
FIX
96% third-party, 0 ms blocking
Warning::
Third-party code accounts for 96% of page weight (1.4 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
F
JS Execution Cost
Action
3986ms total JS execution
FIX
3986ms total JS execution
Warning::
https://speakerdeck.com/: 1080ms CPU time
Warning::
Unattributable: 550ms CPU time
Warning::
https://speakerdeck.com/cdn-cgi/challenge-platform...: 336ms CPU time
Warning::
https://cdn4.buysellads.net/pub/speakerdeck.js?177...: 312ms CPU time
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 300ms CPU time
Warning::
Third-party scripts: 2569ms (64% of total)

Main Thread Breakdown

Script Evaluation 50% Other 20% Script Parsing & Compilation 14% Style & Layout 11% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://speakerdeck.com/1080ms188ms5ms1st
Unattributable550ms65ms0ms3rd
https://speakerdeck.com/cdn-cgi/challenge-platform/scripts/jsd/main.js336ms325ms4ms1st
https://cdn4.buysellads.net/pub/speakerdeck.js?1776807000000312ms220ms84ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js300ms218ms79ms3rd
https://www.googletagmanager.com/gtag/js?id=G-8WD0LC0MP9&cx=c&gtm=4e64h1295ms233ms58ms3rd
https://d1eu30co0ohy4w.cloudfront.net/assets/js/application-d48f03e9e9f1d7e7ef13.js212ms102ms97ms3rd
https://btloader.com/tag?o=5102648370397184&upapi=true186ms162ms16ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TSP938CX181ms133ms46ms3rd
https://connect.facebook.net/signals/config/2893765844191276?v=2.9.303&r=stable&domain=speakerdeck.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%2C168175ms145ms29ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
12 scripts, 690 KB unused
FIX
12 scripts, 690 KB unused
Warning::
https://d1eu30co0ohy4w.cloudfront.net/assets/js/ap...: 186 KB unused (87%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://securepubads.g.doubleclick.net/pagead/mana...: 143 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn4.buysellads.net/pub/speakerdeck.js?177...: 109 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://c.amazon-adsystem.com/aax2/apstag.js: 89 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-8WD0...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 690 KB
690 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://d1eu30co0ohy4w.cloudfront.net/assets/js/application-d48f03e9e9f1d7e7ef13.js215 KB186 KB (87%)✓3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js188 KB143 KB (76%)✓3rd
https://cdn4.buysellads.net/pub/speakerdeck.js?1776807000000163 KB109 KB (67%)✓3rd
https://c.amazon-adsystem.com/aax2/apstag.js91 KB89 KB (98%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-8WD0LC0MP9&cx=c&gtm=4e64h1153 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TSP938CX124 KB65 KB (52%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (35%)✓3rd
https://d1eu30co0ohy4w.cloudfront.net/assets/js/stats-066544ee5ddf3e5e4a9c.js3 KB—✓3rd
https://speakerdeck.com/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?13 KB—✓1st
https://connect.facebook.net/signals/config/2893765844191276?v=2.9.303&r=stable&domain=speakerdeck.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%2C16844 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
65 resources · 1.5 MB · 690 KB savings available
FIX
65 resources · 1.5 MB · 690 KB savings available
Warning::
Page weight 494 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~690 KB of savings available
Warning::
56 third-party resources (96% of weight)
Info::
1 resources over 200KB
65 resources · 1.5 MiB · 56 third-party 494.5 KiB over 1MB target
JavaScript 76% · 1.1 MiB
Image 15% · 230.5 KiB
CSS 3% · 43.6 KiB
Font 3% · 41.4 KiB
Other 2% · 26.6 KiB
Document 1% · 17.6 KiB

~690.5 KiB of savings available

Remove unused JavaScript: 690.5 KiB
B
Page Weight Budget
1.5 MB transferred, 65 requests
REVIEW
1.5 MB transferred, 65 requests
Info::
Page weighs 4.6 MB (1.5 MB transferred)
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::
65 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
65 requests
0.31 g CO2 per page load
JavaScript 1.1 MiB 76%
Images 188.4 KiB 12%
Other 64.9 KiB 4%
CSS 43.6 KiB 3%
Fonts 41.4 KiB 3%
HTML 15.3 KiB 1%
Other 4.7 KiB 0%
Other 844 B 0%
Other 592 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
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 188 KB
0 oversized -0 KB
10 legacy format
0 missing dimensions CLS risk
B
HTTP Caching
max-age=0, private, must-revalidate
REVIEW
max-age=0, private, must-revalidate
Info::
Cache-Control header is set
Got: max-age=0, private, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, private, must-revalidate

DirectiveValueMeaning
max-age0Cache for 0 seconds
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
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
3 fonts (41 KB)
PASS
3 fonts (41 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

41 KB total

Render-blocking

0

of 3

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 FCP 3.9 s LCP 4.2 shttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2S6u9w4BMUTPHh6UVSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 13.9 KiB — 8 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 11 ms — font-display: swaphttps://fonts.gstatic.com/s/robotoslab/v36/BngbUXZYTXPIvIBgJJSb6s3BzlRRfKOFbvjoa4Omb2RjV9Ku1Q.woff2BngbUXZYTXPIvIBgJJSb6s3... https://fonts.gstatic.com/s/robotoslab/v36/BngbUXZYTXPIvIBgJJSb6s3BzlRRfKOFbvjoa4Omb2RjV9Ku1Q.woff2 — 13.9 KiB — 13 ms — font-display: swap
S6u9w4BMUTPHh6UVSwiPGQ3... woff2 swap
Size 14 KB
Load time 8 ms
Start 717 ms
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 11 ms
Start 719 ms
Risk FOUT — text flashes from fallback to web font
BngbUXZYTXPIvIBgJJSb6s3... woff2 swap
Size 14 KB
Load time 13 ms
Start 720 ms
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
2
preload
1
dns-prefetch
—
prefetch
—

3 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: Cloudflare

Network Waterfall
65 requests over 5251ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 3.9 s LCP 4.2 shttps://speakerdeck.com// https://speakerdeck.com/ — 200 — 12.4 KiB — 479 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/application-0853bc215819f43b15391734b5a07d7d5da077f84747c1de8bfa568d2275c3c6.cssd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/application-0853bc215819f43b15391734b5a07d7d5da077f84747c1de8bfa568d2275c3c6.css — 200 — 42.4 KiB — 41 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/js/application-d48f03e9e9f1d7e7ef13.jsd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/js/application-d48f03e9e9f1d7e7ef13.js — 200 — 214.6 KiB — 50 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/js/stats-066544ee5ddf3e5e4a9c.jsd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/js/stats-066544ee5ddf3e5e4a9c.js — 200 — 2.5 KiB — 45 ms — h2https://fonts.googleapis.com/css?family=Lato:400,700|Roboto+Slab:700&display=swapfonts.googleapis.com/css?family=Lat... https://fonts.googleapis.com/css?family=Lato:400,700|Roboto+Slab:700&display=swap — 200 — 1.2 KiB — 127 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/heroine-80c6d04b20597de201bddb28a3146c41175bf210ad75fac8eb1f9d93951d56aa.svgd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/heroine-80c6d04b20597de201bddb28a3146c41175bf210ad75fac8eb1f9d93951d56aa.svg — 200 — 3.6 KiB — 7 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/mark-f4be6df1e05965cac9f98e664a6c35f5ffdd0207385d07464a9214d6cdf76082.svgd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/mark-f4be6df1e05965cac9f98e664a6c35f5ffdd0207385d07464a9214d6cdf76082.svg — 200 — 1.8 KiB — 7 ms — h2https://speakerdeck.com/rails/active_storage/representations/redirect/eyJfcmFpbHMiOnsiZGF0YSI6NSwicHVyIjoiYmxvYl9pZCJ9fQ==--e0a28a83e5f407135065b2eb806d5244393a1299/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fZmlsbCI6WzY0LDY0XX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--526ef8fef1d0baa8f010cff2933d401199e3a1ed/21.12.23--Kristopher%20Preimer-019%20-web%20copy.jpg/rails/active_storage/representatio... https://speakerdeck.com/rails/active_storage/representations/redirect/eyJfcmFpbHMiOnsiZGF0YSI6NSwicHVyIjoiYmxvYl9pZCJ9fQ==--e0a28a83e5f407135065b2eb806d5244393a1299/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fZmlsbCI6WzY0LDY0XX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--526ef8fef1d0baa8f010cff2933d401199e3a1ed/21.12.23--Kristopher%20Preimer-019%20-web%20copy.jpg — 302 — 2.3 KiB — 405 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-TSP938CXwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TSP938CX — 200 — 124.0 KiB — 257 ms — 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h2https://ab.dns-finder.com/meta/dnsab.dns-finder.com/meta/dns https://ab.dns-finder.com/meta/dns — 200 — 233 B — 175 ms — h2https://cdn.api.btloader.com/device?orgid=5102648370397184&model=moto+g+power+%282022%29&platformVersion=11.0&fullVersionList=%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5Dcdn.api.btloader.com/device?orgid=5... https://cdn.api.btloader.com/device?orgid=5102648370397184&model=moto+g+power+%282022%29&platformVersion=11.0&fullVersionList=%5B%7B%22brand%22%3A%22Not-A.Brand%22%2C%22version%22%3A%2224.0.0.0%22%7D%2C%7B%22brand%22%3A%22Chromium%22%2C%22version%22%3A%22146.0.7680.164%22%7D%5D — 200 — 348 B — 181 ms — h2https://btloader.com/trustedIframe.html?o=5102648370397184&upapi=truebtloader.com/trustedIframe.html?o=5... https://btloader.com/trustedIframe.html?o=5102648370397184&upapi=true — 200 — 2.2 KiB — 31 ms — h2https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.jssecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604160201/pubads_impl.js — 200 — 187.7 KiB — 18 ms — h3https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gptsecurepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/dict/m202604210101/gpt — 200 — 23.0 KiB — 60 ms — h3https://api.btloader.com/exd?tid=iOXKBdhm-lxBy0LcdF-9db1f804ce&sid=imsvz8PQN-HP9z404Y6-9db1f804ce&cv=2.1.187-1-g24d1c87&upapi=trueapi.btloader.com/exd?tid=iOXKBdhm-l... https://api.btloader.com/exd?tid=iOXKBdhm-lxBy0LcdF-9db1f804ce&sid=imsvz8PQN-HP9z404Y6-9db1f804ce&cv=2.1.187-1-g24d1c87&upapi=true — 204 — 128 B — 156 ms — h2https://srv.buysellads.com/ads/CWYIE53I.json?forcebanner=623481&ignoretargeting=yessrv.buysellads.com/ads/CWYIE53I.jso... https://srv.buysellads.com/ads/CWYIE53I.json?forcebanner=623481&ignoretargeting=yes — 200 — 683 B — 521 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/favicon-bdd5839d46040a50edf189174e6f7aacc8abb3aaecd56a4711cf00d820883f47.pngd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/favicon-bdd5839d46040a50edf189174e6f7aacc8abb3aaecd56a4711cf00d820883f47.png — 200 — 10.7 KiB — 6 ms — h2https://speakerdeck.com/favicon.png/favicon.png https://speakerdeck.com/favicon.png — 200 — 10.3 KiB — 13 ms — h2https://ad-delivery.net/px.gif?ch=1&e=0.8741304290664941ad-delivery.net/px.gif?ch=1&e=0.874... https://ad-delivery.net/px.gif?ch=1&e=0.8741304290664941 — 200 — 110 B — 9 ms — h2https://ad-delivery.net/px.gif?ch=2&e=0.8761510494471159ad-delivery.net/px.gif?ch=2&e=0.876... https://ad-delivery.net/px.gif?ch=2&e=0.8761510494471159 — 200 — 133 B — 9 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.23976114537174253ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.23976114537174253 — 200 — 129 B — 57 ms — h3https://ad-delivery.net/px.gif?ch=2&e=0.9500196455612945ad-delivery.net/px.gif?ch=2&e=0.950... https://ad-delivery.net/px.gif?ch=2&e=0.9500196455612945 — 200 — 113 B — 8 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.018210611819441835ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.018210611819441835 — 200 — 129 B — 62 ms — h3https://ad-delivery.net/px.gif?ch=1&e=0.9925520368326656ad-delivery.net/px.gif?ch=1&e=0.992... https://ad-delivery.net/px.gif?ch=1&e=0.9925520368326656 — 200 — 110 B — 7 ms — h2https://ab.dns-finder.com/meta/dnsab.dns-finder.com/meta/dns https://ab.dns-finder.com/meta/dns — 200 — 0 B — 2 ms — h2https://ad-delivery.net/px.gif?ch=1&e=0.22674879461140718ad-delivery.net/px.gif?ch=1&e=0.226... https://ad-delivery.net/px.gif?ch=1&e=0.22674879461140718 — 200 — 134 B — 7 ms — h2https://ad-delivery.net/px.gif?ch=2&e=0.6704783067975192ad-delivery.net/px.gif?ch=2&e=0.670... https://ad-delivery.net/px.gif?ch=2&e=0.6704783067975192 — 200 — 110 B — 7 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.2049697390196713ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.2049697390196713 — 200 — 129 B — 61 ms — h3https://ad-delivery.net/px.gif?ch=2&e=0.45800637250932474ad-delivery.net/px.gif?ch=2&e=0.458... https://ad-delivery.net/px.gif?ch=2&e=0.45800637250932474 — 200 — 116 B — 10 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.6274371592577185ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.6274371592577185 — 200 — 129 B — 62 ms — h3https://ad-delivery.net/px.gif?ch=2&e=0.527674966658335ad-delivery.net/px.gif?ch=2&e=0.527... https://ad-delivery.net/px.gif?ch=2&e=0.527674966658335 — 200 — 135 B — 8 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.5017957604006672ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.5017957604006672 — 200 — 129 B — 62 ms — h3https://ad-delivery.net/px.gif?ch=2&e=0.787103675246983ad-delivery.net/px.gif?ch=2&e=0.787... https://ad-delivery.net/px.gif?ch=2&e=0.787103675246983 — 200 — 110 B — 8 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.42856548974430886ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.42856548974430886 — 200 — 129 B — 62 ms — h3https://api.btloader.com/country?o=5102648370397184api.btloader.com/country?o=51026483... https://api.btloader.com/country?o=5102648370397184 — 200 — 153 B — 163 ms — h2https://api.btloader.com/pv?nlf=false&tid=iOXKBdhm-lxBy0LcdF-9db1f804ce&sid=imsvz8PQN-HP9z404Y6-9db1f804ce&cv=2.1.187-1-g24d1c87&upapi=trueapi.btloader.com/pv?nlf=false&tid=i... https://api.btloader.com/pv?nlf=false&tid=iOXKBdhm-lxBy0LcdF-9db1f804ce&sid=imsvz8PQN-HP9z404Y6-9db1f804ce&cv=2.1.187-1-g24d1c87&upapi=true — 204 — 40 B — 151 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
64% of JavaScript execution is third-party
First-party Third-party 2569ms · 1143KB · €28/mo
Unattributable
Other
Costly
Execution 550ms
Transfer 0 KB
Monthly Cost €6/mo
cdn4.buysellads.net
Other
Costly
Execution 312ms
Transfer 163 KB
Unused 67%
Monthly Cost €3/mo
securepubads.g.doubleclick.net
Other
Costly
Execution 300ms
Transfer 188 KB
Unused 76%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 295ms
Transfer 153 KB
Unused 43%
Monthly Cost €3/mo
d1eu30co0ohy4w.cloudfront.net
Other
Costly
Execution 212ms
Transfer 215 KB
Unused 87%
Monthly Cost €2/mo
btloader.com
Other
Optional
Execution 186ms
Transfer 35 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 181ms
Transfer 124 KB
Unused 52%
Monthly Cost €2/mo
Facebook Pixel
Advertising
Optional
Execution 175ms
Transfer 44 KB
Monthly Cost €2/mo
Facebook Pixel
Advertising
Optional
Execution 171ms
Transfer 97 KB
Unused 35%
Monthly Cost €2/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 112ms
Transfer 34 KB
Monthly Cost €1/mo
c.amazon-adsystem.com
Other
Optional
Execution 74ms
Transfer 91 KB
Unused 98%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 550ms and costs ~€6/month
  • cdn4.buysellads.net adds 312ms and costs ~€3/month
  • securepubads.g.doubleclick.net adds 300ms and costs ~€3/month
  • Google Tag Manager adds 295ms and costs ~€3/month
  • d1eu30co0ohy4w.cloudfront.net adds 212ms and costs ~€2/month

64% 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 550ms 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

cdn4.buysellads.net takes 312ms 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

67% of cdn4.buysellads.net'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

securepubads.g.doubleclick.net takes 300ms 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

76% of securepubads.g.doubleclick.net'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

Google Tag Manager takes 295ms 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

d1eu30co0ohy4w.cloudfront.net takes 212ms 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

87% of d1eu30co0ohy4w.cloudfront.net'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

52% 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

98% of c.amazon-adsystem.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

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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