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https://speakerdeck.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.

976 ms

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

1.47 s

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

66 ms

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

0.007

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

1.09 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.

3.54 s

Page Load Progression

932 ms
1.9 s
2.8 s
3.7 s
4.7 s
5.6 s
6.5 s
7.5 s
Checks
15
6 PASS 4 REVIEW 3 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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
F
JS Bundles
Action
12 scripts, 689 KB unused
FIX
12 scripts, 689 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...: 141 KB unused (75%)
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: 689 KB
689 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/m202604170101/pubads_impl.js?cb=31097946187 KB141 KB (75%)✓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 (36%)✓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
77 resources · 1.6 MB · 689 KB savings available
FIX
77 resources · 1.6 MB · 689 KB savings available
Warning::
Page weight 650 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~689 KB of savings available
Warning::
68 third-party resources (96% of weight)
Info::
1 resources over 200KB
77 resources · 1.6 MiB · 68 third-party 649.8 KiB over 1MB target
JavaScript 69% · 1.1 MiB
Image 23% · 386.6 KiB
CSS 3% · 43.6 KiB
Font 2% · 41.5 KiB
Other 2% · 26.8 KiB
Document 1% · 17.4 KiB

~689.1 KiB of savings available

Remove unused JavaScript: 689.1 KiB
C
Page Weight Budget
Action
1.6 MB transferred, 77 requests
REVIEW
1.6 MB transferred, 77 requests
Info::
Page weighs 4.8 MB (1.6 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::
77 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
77 requests
0.34 g CO2 per page load
JavaScript 1.1 MiB 69%
Images 344.5 KiB 21%
Other 65.0 KiB 4%
CSS 43.6 KiB 3%
Fonts 41.5 KiB 2%
HTML 15.0 KiB 1%
Other 4.7 KiB 0%
Other 842 B 0%
Other 788 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
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Info::
All images are well-optimized
23 images 345 KB
0 oversized -0 KB
22 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
865ms total JS execution
REVIEW
865ms total JS execution
Warning::
https://speakerdeck.com/: 300ms CPU time
Info::
Unattributable: 144ms CPU time
Info::
https://cdn4.buysellads.net/pub/speakerdeck.js?177...: 82ms CPU time
Info::
https://securepubads.g.doubleclick.net/pagead/mana...: 81ms CPU time
Info::
https://speakerdeck.com/cdn-cgi/challenge-platform...: 81ms CPU time
Warning::
Third-party scripts: 484ms (56% of total)

Main Thread Breakdown

Script Evaluation 48% Other 20% Script Parsing & Compilation 13% Style & Layout 13% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://speakerdeck.com/300ms48ms1ms1st
Unattributable144ms8ms0ms3rd
https://cdn4.buysellads.net/pub/speakerdeck.js?177680700000082ms57ms22ms3rd
https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=3109794681ms54ms21ms3rd
https://speakerdeck.com/cdn-cgi/challenge-platform/scripts/jsd/main.js81ms77ms1ms1st
https://www.googletagmanager.com/gtag/js?id=G-8WD0LC0MP9&cx=c&gtm=4e64h174ms58ms14ms3rd
https://d1eu30co0ohy4w.cloudfront.net/assets/js/application-d48f03e9e9f1d7e7ef13.js53ms25ms24ms3rd
https://btloader.com/tag?o=5102648370397184&upapi=true52ms46ms4ms3rd
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 500 ms 1.0 s 1.5 s FCP 976 ms LCP 1.5 shttps://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2S6u9w4BMUTPHh6UVSwiPGQ3... https://fonts.gstatic.com/s/lato/v25/S6u9w4BMUTPHh6UVSwiPGQ3q5d0.woff2 — 13.9 KiB — 12 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2S6uyw4BMUTPHjx4wXiWtFCc... https://fonts.gstatic.com/s/lato/v25/S6uyw4BMUTPHjx4wXiWtFCc.woff2 — 13.7 KiB — 13 ms — font-display: swaphttps://fonts.gstatic.com/s/robotoslab/v36/BngbUXZYTXPIvIBgJJSb6s3BzlRRfKOFbvjoa4Omb2RjV9Su1cai.woff2BngbUXZYTXPIvIBgJJSb6s3... https://fonts.gstatic.com/s/robotoslab/v36/BngbUXZYTXPIvIBgJJSb6s3BzlRRfKOFbvjoa4Omb2RjV9Su1cai.woff2 — 14.0 KiB — 15 ms — font-display: swap
S6u9w4BMUTPHh6UVSwiPGQ3... woff2 swap
Size 14 KB
Load time 12 ms
Start 764 ms
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXiWtFCc... woff2 swap
Size 14 KB
Load time 13 ms
Start 765 ms
Risk FOUT — text flashes from fallback to web font
BngbUXZYTXPIvIBgJJSb6s3... woff2 swap
Size 14 KB
Load time 15 ms
Start 766 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
77 requests over 5151ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 976 ms LCP 1.5 shttps://speakerdeck.com// https://speakerdeck.com/ — 200 — 12.1 KiB — 522 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/application-0853bc215819f43b15391734b5a07d7d5da077f84747c1de8bfa568d2275c3c6.cssd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/application-0853bc215819f43b15391734b5a07d7d5da077f84747c1de8bfa568d2275c3c6.css — 200 — 42.4 KiB — 31 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 — 38 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 — 38 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 — 134 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/heroine-80c6d04b20597de201bddb28a3146c41175bf210ad75fac8eb1f9d93951d56aa.svgd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/heroine-80c6d04b20597de201bddb28a3146c41175bf210ad75fac8eb1f9d93951d56aa.svg — 200 — 3.6 KiB — 5 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/mark-f4be6df1e05965cac9f98e664a6c35f5ffdd0207385d07464a9214d6cdf76082.svgd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/mark-f4be6df1e05965cac9f98e664a6c35f5ffdd0207385d07464a9214d6cdf76082.svg — 200 — 1.8 KiB — 4 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 — 2.4 KiB — 227 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 — 337 ms — h2https://cdn4.buysellads.net/pub/speakerdeck.js?1776807000000cdn4.buysellads.net/pub/speakerdeck... https://cdn4.buysellads.net/pub/speakerdeck.js?1776807000000 — 200 — 163.0 KiB — 740 ms — h2https://speakerdeck.com/icons/icons.svg?v=2026-03-15/icons/icons.svg?v=2026-03-15 https://speakerdeck.com/icons/icons.svg?v=2026-03-15 — 200 — 18.4 KiB — 14 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 — 55 ms — h3https://files.speakerdeck.com/presentations/4f59246535ca6900210046a4/preview_slide_0.jpg?72331files.speakerdeck.com/presentations... https://files.speakerdeck.com/presentations/4f59246535ca6900210046a4/preview_slide_0.jpg?72331 — 200 — 45.8 KiB — 38 ms — h2https://files.speakerdeck.com/presentations/1bdfc578481d4d3fb7001ddd92a8906a/preview_slide_0.jpg?37563748files.speakerdeck.com/presentations... https://files.speakerdeck.com/presentations/1bdfc578481d4d3fb7001ddd92a8906a/preview_slide_0.jpg?37563748 — 200 — 42.9 KiB — 38 ms — h2https://files.speakerdeck.com/presentations/d2a8d50fe7594150a8c2f501d3ac3b1a/preview_slide_0.jpg?32018734files.speakerdeck.com/presentations... https://files.speakerdeck.com/presentations/d2a8d50fe7594150a8c2f501d3ac3b1a/preview_slide_0.jpg?32018734 — 200 — 34.4 KiB — 39 ms — h2https://files.speakerdeck.com/presentations/16d891fb2d884d6184bb69eaa42503ef/preview_slide_0.jpg?23246712files.speakerdeck.com/presentations... https://files.speakerdeck.com/presentations/16d891fb2d884d6184bb69eaa42503ef/preview_slide_0.jpg?23246712 — 200 — 39.2 KiB — 27 ms — h2https://files.speakerdeck.com/presentations/c711731dd997437c90294769eafc273f/preview_slide_0.jpg?32404754files.speakerdeck.com/presentations... https://files.speakerdeck.com/presentations/c711731dd997437c90294769eafc273f/preview_slide_0.jpg?32404754 — 200 — 49.8 KiB — 24 ms — h2data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' …www.w3.org/2000/svg' viewBox='-4 -4... data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' … — 200 — 0 B — 0 ms — datahttps://files.speakerdeck.com/presentations/eac4d06353f448b8b13de29c458ec02d/preview_slide_0.jpg?35113613files.speakerdeck.com/presentations... https://files.speakerdeck.com/presentations/eac4d06353f448b8b13de29c458ec02d/preview_slide_0.jpg?35113613 — 200 — 35.7 KiB — 36 ms — h2https://files.speakerdeck.com/presentations/01edd780c7e0013168aa3a2cd771e4db/preview_slide_0.jpg?3074513files.speakerdeck.com/presentations... https://files.speakerdeck.com/presentations/01edd780c7e0013168aa3a2cd771e4db/preview_slide_0.jpg?3074513 — 200 — 28.0 KiB — 21 ms — h2https://files.speakerdeck.com/presentations/4fd396d0d3d0d6002202b7c2/preview_slide_0.jpg?421638files.speakerdeck.com/presentations... 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https://www.facebook.com/tr/?id=2893765844191276&ev=PageView&dl=https%3A%2F%2Fspeakerdeck.com%2F&rl=&if=false&ts=1776807336581&sw=800&sh=600&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.1.1776807336570.890781081375391928&ler=empty&cdl=API_unavailable&pmd[title]=Speaker%20Deck%20%7C%20Easily%20Share%20Your%20Presentations%20Online&pmd[locale]=en&pmd[description]=Speaker%20Deck%20is%20the%20best%20way%20to%20share%20presentations%20online.%20Simply%20upload%20your%20slides%20as%20a%20PDF%2C%20and%20we%E2%80%99ll%20turn%20them%20into%20a%20beautiful%20online%20experience.%20View%20them%20on%20SpeakerDeck.com%2C%20or%20share%20them%20on%20any%20website%20with%20an%20embed%20code.&plt=790.6000001430511&it=1776807336458&coo=false&expv2[0]=pl0&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im0&expv2[6]=hf0&rqm=GET — 200 — 16 B — 27 ms — h3https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=2893765844191276&ev=PageView&dl=https%3A%2F%2Fspeakerdeck.com%2F&rl=&if=false&ts=1776807336581&sw=800&sh=600&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.1.1776807336570.890781081375391928&ler=empty&cdl=API_unavailable&pmd[title]=Speaker%20Deck%20%7C%20Easily%20Share%20Your%20Presentations%20Online&pmd[locale]=en&pmd[description]=Speaker%20Deck%20is%20the%20best%20way%20to%20share%20presentations%20online.%20Simply%20upload%20your%20slides%20as%20a%20PDF%2C%20and%20we%E2%80%99ll%20turn%20them%20into%20a%20beautiful%20online%20experience.%20View%20them%20on%20SpeakerDeck.com%2C%20or%20share%20them%20on%20any%20website%20with%20an%20embed%20code.&plt=790.6000001430511&it=1776807336458&coo=false&expv2[0]=pl0&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im0&expv2[6]=hf0&rqm=FGETwww.facebook.com/privacy_sandbox/pi... https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=2893765844191276&ev=PageView&dl=https%3A%2F%2Fspeakerdeck.com%2F&rl=&if=false&ts=1776807336581&sw=800&sh=600&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.1.1776807336570.890781081375391928&ler=empty&cdl=API_unavailable&pmd[title]=Speaker%20Deck%20%7C%20Easily%20Share%20Your%20Presentations%20Online&pmd[locale]=en&pmd[description]=Speaker%20Deck%20is%20the%20best%20way%20to%20share%20presentations%20online.%20Simply%20upload%20your%20slides%20as%20a%20PDF%2C%20and%20we%E2%80%99ll%20turn%20them%20into%20a%20beautiful%20online%20experience.%20View%20them%20on%20SpeakerDeck.com%2C%20or%20share%20them%20on%20any%20website%20with%20an%20embed%20code.&plt=790.6000001430511&it=1776807336458&coo=false&expv2[0]=pl0&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im0&expv2[6]=hf0&rqm=FGET — 200 — 202 B — 317 ms — h3https://www.googletagmanager.com/gtag/js?id=G-8WD0LC0MP9&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-8WD0LC0MP9&cx=c&gtm=4e64h1 — 200 — 153.0 KiB — 200 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-8WD0LC0MP9&gtm=45je64h1v882342855z89224220202za20gzb9224220202zd9224220202&_p=1776807336242&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=440983120.1776807337&frm=0&pscdl=noapi&rcb=9&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401~118167058&sid=1776807336&sct=1&seg=0&dl=https%3A%2F%2Fspeakerdeck.com%2F&dt=Speaker%20Deck%20%7C%20Easily%20Share%20Your%20Presentations%20Online&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1319www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-8WD0LC0MP9&gtm=45je64h1v882342855z89224220202za20gzb9224220202zd9224220202&_p=1776807336242&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=440983120.1776807337&frm=0&pscdl=noapi&rcb=9&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938465~115938468~117266401~118167058&sid=1776807336&sct=1&seg=0&dl=https%3A%2F%2Fspeakerdeck.com%2F&dt=Speaker%20Deck%20%7C%20Easily%20Share%20Your%20Presentations%20Online&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1319 — 204 — 549 B — 163 ms — h2https://btloader.com/tag?o=5102648370397184&upapi=truebtloader.com/tag?o=5102648370397184... https://btloader.com/tag?o=5102648370397184&upapi=true — 200 — 34.8 KiB — 42 ms — h2https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — 200 — 33.8 KiB — 134 ms — h3https://c.amazon-adsystem.com/aax2/apstag.jsc.amazon-adsystem.com/aax2/apstag.j... https://c.amazon-adsystem.com/aax2/apstag.js — 200 — 91.0 KiB — 21 ms — h2https://ad-delivery.net/px.gif?ch=2&e=0.6022794680094994ad-delivery.net/px.gif?ch=2&e=0.602... https://ad-delivery.net/px.gif?ch=2&e=0.6022794680094994 — 200 — 112 B — 47 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.43186435382799204ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.43186435382799204 — 200 — 129 B — 120 ms — h3https://cdn.btloader.com/cchecker.html?upapi=truecdn.btloader.com/cchecker.html?upap... https://cdn.btloader.com/cchecker.html?upapi=true — 200 — 707 B — 44 ms — h2https://ad-delivery.net/px.gif?ch=1&e=0.7622107411922038ad-delivery.net/px.gif?ch=1&e=0.762... https://ad-delivery.net/px.gif?ch=1&e=0.7622107411922038 — 200 — 610 B — 36 ms — h2https://ab.dns-finder.com/meta/dnsab.dns-finder.com/meta/dns https://ab.dns-finder.com/meta/dns — 200 — 233 B — 170 ms — h2https://cdn.api.btloader.com/device?orgid=5102648370397184&platformVersion=10.15.7&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&platformVersion=10.15.7&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 — 335 B — 149 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 — 25 ms — h2https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946securepubads.g.doubleclick.net/page... https://securepubads.g.doubleclick.net/pagead/managed/js/gpt/m202604170101/pubads_impl.js?cb=31097946 — 200 — 187.4 KiB — 17 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 — 55 ms — h3https://api.btloader.com/exd?tid=6rYqcBVV-NGJuMZ6b4k-9db1f85c79&sid=HMoIMmuS-wuClls2r0-9db1f85c79&cv=2.1.187-1-g24d1c87&upapi=trueapi.btloader.com/exd?tid=6rYqcBVV-N... https://api.btloader.com/exd?tid=6rYqcBVV-NGJuMZ6b4k-9db1f85c79&sid=HMoIMmuS-wuClls2r0-9db1f85c79&cv=2.1.187-1-g24d1c87&upapi=true — 204 — 128 B — 159 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 — 679 B — 567 ms — h2https://d1eu30co0ohy4w.cloudfront.net/assets/favicon-bdd5839d46040a50edf189174e6f7aacc8abb3aaecd56a4711cf00d820883f47.pngd1eu30co0ohy4w.cloudfront.net/asset... https://d1eu30co0ohy4w.cloudfront.net/assets/favicon-bdd5839d46040a50edf189174e6f7aacc8abb3aaecd56a4711cf00d820883f47.png — 200 — 10.7 KiB — 10 ms — h2https://speakerdeck.com/favicon.png/favicon.png https://speakerdeck.com/favicon.png — 200 — 10.3 KiB — 14 ms — h2https://ad-delivery.net/px.gif?ch=1&e=0.3242782959679912ad-delivery.net/px.gif?ch=1&e=0.324... https://ad-delivery.net/px.gif?ch=1&e=0.3242782959679912 — 200 — 110 B — 7 ms — h2https://ad-delivery.net/px.gif?ch=2&e=0.10271653801819303ad-delivery.net/px.gif?ch=2&e=0.102... https://ad-delivery.net/px.gif?ch=2&e=0.10271653801819303 — 200 — 110 B — 7 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.9652781114616217ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.9652781114616217 — 200 — 129 B — 57 ms — h3https://ad-delivery.net/px.gif?ch=2&e=0.4612111231346455ad-delivery.net/px.gif?ch=2&e=0.461... https://ad-delivery.net/px.gif?ch=2&e=0.4612111231346455 — 200 — 135 B — 7 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.21606710191109302ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.21606710191109302 — 200 — 129 B — 65 ms — h3https://ad-delivery.net/px.gif?ch=1&e=0.821838416729667ad-delivery.net/px.gif?ch=1&e=0.821... https://ad-delivery.net/px.gif?ch=1&e=0.821838416729667 — 200 — 110 B — 9 ms — h2https://ab.dns-finder.com/meta/dnsab.dns-finder.com/meta/dns https://ab.dns-finder.com/meta/dns — 200 — 0 B — 1 ms — h2https://ad-delivery.net/px.gif?ch=1&e=0.7124053263904776ad-delivery.net/px.gif?ch=1&e=0.712... https://ad-delivery.net/px.gif?ch=1&e=0.7124053263904776 — 200 — 110 B — 8 ms — h2https://ad-delivery.net/px.gif?ch=2&e=0.21406680563665925ad-delivery.net/px.gif?ch=2&e=0.214... https://ad-delivery.net/px.gif?ch=2&e=0.21406680563665925 — 200 — 110 B — 8 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.6629102416748668ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.6629102416748668 — 200 — 129 B — 55 ms — h3https://ad-delivery.net/px.gif?ch=2&e=0.19924721119739375ad-delivery.net/px.gif?ch=2&e=0.199... https://ad-delivery.net/px.gif?ch=2&e=0.19924721119739375 — 200 — 133 B — 8 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.345113060881309ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.345113060881309 — 200 — 129 B — 65 ms — h3https://ad-delivery.net/px.gif?ch=2&e=0.5823701097514334ad-delivery.net/px.gif?ch=2&e=0.582... https://ad-delivery.net/px.gif?ch=2&e=0.5823701097514334 — 200 — 112 B — 7 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.6421590412063244ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.6421590412063244 — 200 — 129 B — 55 ms — h3https://ad-delivery.net/px.gif?ch=2&e=0.9463904957961363ad-delivery.net/px.gif?ch=2&e=0.946... https://ad-delivery.net/px.gif?ch=2&e=0.9463904957961363 — 200 — 110 B — 7 ms — h2https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.39487737806578604ad.doubleclick.net/favicon.ico?ad=3... https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250&e=0.39487737806578604 — 200 — 129 B — 60 ms — h3https://api.btloader.com/country?o=5102648370397184api.btloader.com/country?o=51026483... https://api.btloader.com/country?o=5102648370397184 — 200 — 153 B — 150 ms — h2https://api.btloader.com/pv?nlf=false&tid=6rYqcBVV-NGJuMZ6b4k-9db1f85c79&sid=HMoIMmuS-wuClls2r0-9db1f85c79&cv=2.1.187-1-g24d1c87&upapi=trueapi.btloader.com/pv?nlf=false&tid=6... https://api.btloader.com/pv?nlf=false&tid=6rYqcBVV-NGJuMZ6b4k-9db1f85c79&sid=HMoIMmuS-wuClls2r0-9db1f85c79&cv=2.1.187-1-g24d1c87&upapi=true — 204 — 40 B — 149 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
56% of JavaScript execution is third-party
First-party Third-party 484ms · 753KB · €5/mo
Unattributable
Other
Optional
Execution 144ms
Transfer 0 KB
Monthly Cost €2/mo
cdn4.buysellads.net
Other
Optional
Execution 82ms
Transfer 163 KB
Unused 67%
Monthly Cost €1/mo
securepubads.g.doubleclick.net
Other
Optional
Execution 81ms
Transfer 187 KB
Unused 75%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 74ms
Transfer 153 KB
Unused 43%
Monthly Cost €1/mo
d1eu30co0ohy4w.cloudfront.net
Other
Optional
Execution 53ms
Transfer 215 KB
Unused 87%
Monthly Cost €1/mo
btloader.com
Other
Optional
Execution 52ms
Transfer 35 KB
Monthly Cost €1/mo

56% 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

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

75% 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

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

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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