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https://hexo.io

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
74
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

822 ms

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

982 ms

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

0 ms

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

0.058

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

822 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

982 ms

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
15
8 PASS 4 REVIEW 1 FIX
D
Third-Party Impact
Action
65% third-party, 0 ms blocking
FIX
65% third-party, 0 ms blocking
Warning::
Third-party code accounts for 65% of page weight (588.9 KiB of 903.0 KiB)
Info::
Third-party blocking time is low (0 ms)
35%
65%
First-party Third-party
C
Image Optimization
Action
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://img.shields.io/github/stars/hexojs/hexo?st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img.shields.io/twitter/follow/hexojs?style... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img.shields.io/github/forks/hexojs/hexo?st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img.shields.io/npm/dm/hexo?logo=npm&style=... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hexo.io/themes/screenshots/landscape.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.netlify.com/img/global/badges/netlify-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 313 KB
0 oversized -0 KB
8 legacy format
6 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

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

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

B
JS Bundles
7 scripts, 93 KB unused
REVIEW
7 scripts, 93 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-8VWF...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/npm/@docsearch/js@3: 30 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 93 KB
93 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-8VWFR61YDH&cx=c&_slc=1148 KB63 KB (43%)✓3rd
https://cdn.jsdelivr.net/npm/@docsearch/js@336 KB30 KB (83%)✓3rd
https://cdn.jsdelivr.net/npm/js-cookie@2/src/js.cookie.min.js1 KB—✓3rd
https://hexo.io/js/lang_select.js0 KB—✓1st
https://hexo.io/js/mobile_nav.js0 KB—✓1st
https://hexo.io/js/colorScheme.js0 KB—✓1st
https://www.google-analytics.com/analytics.js21 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
public,max-age=0,must-revalidate
REVIEW
public,max-age=0,must-revalidate
Info::
Cache-Control header is set
Got: public,max-age=0,must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

public,max-age=0,must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A
Page Weight Budget
903 KB transferred, 31 requests
PASS
903 KB transferred, 31 requests
Info::
Page weighs 1.4 MB (903 KB transferred)
Info::
Fonts are 340 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 340 KB
Info::
31 HTTP requests
Info::
Estimated 0.18 g CO2 per page load
903 KB / 2.4 MB budget
903 KB transferred
31 requests
0.18 g CO2 per page load
Fonts 340.3 KiB 38%
Images 313.3 KiB 35%
JavaScript 207.2 KiB 23%
CSS 35.9 KiB 4%
HTML 4.0 KiB 0%
Other 774 B 0%
Other 552 B 0%
Other 543 B 0%
Other 459 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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+
JS Execution Cost
153ms total JS execution
PASS
153ms total JS execution
Info::
https://hexo.io/: 77ms CPU time
Info::
Unattributable: 76ms CPU time
Info::
Third-party scripts: 76ms (50% of total)

Main Thread Breakdown

Script Evaluation 36% Other 28% Style & Layout 24% Script Parsing & Compilation 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://hexo.io/77ms6ms0ms1st
Unattributable76ms19ms0ms3rd
A+
Font Loading
5 fonts (340 KB)
PASS
5 fonts (340 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

340 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 822 ms LCP 982 mshttps://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-400.woff2lato-latin-400.woff2 https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-400.woff2 — 23.3 KiB — 9 ms — font-display: swaphttps://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/webfonts/fa-brands-400.woff2 — 116.3 KiB — 19 ms — font-display: swaphttps://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/webfonts/fa-solid-900.woff2 — 154.9 KiB — 20 ms — font-display: swaphttps://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-300.woff2lato-latin-300.woff2 https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-300.woff2 — 23.1 KiB — 14 ms — font-display: swaphttps://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-700.woff2lato-latin-700.woff2 https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-700.woff2 — 22.8 KiB — 12 ms — font-display: swap
lato-latin-400.woff2 woff2 swap
Size 23 KB
Load time 9 ms
Start 308 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 19 ms
Start 309 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 20 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
lato-latin-300.woff2 woff2 swap
Size 23 KB
Load time 14 ms
Start 311 ms
Risk FOUT — text flashes from fallback to web font
lato-latin-700.woff2 woff2 swap
Size 23 KB
Load time 12 ms
Start 322 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)

Fixing the unchecked items could save ~136 KB and ~272 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
31 resources · 903 KB · 93 KB savings available
PASS
31 resources · 903 KB · 93 KB savings available
Info::
Within 1MB page-weight target
Got: 903 KB
Info::
~93 KB of savings available
Warning::
23 third-party resources (65% of weight)
Info::
1 resources over 200KB
31 resources · 903.0 KiB · 23 third-party Within 1MB page-weight target
Font 38% · 340.3 KiB
Image 35% · 313.7 KiB
JavaScript 23% · 207.2 KiB
CSS 4% · 35.9 KiB
Document 0% · 4.0 KiB
Other 0% · 1.9 KiB

~92.5 KiB of savings available

Remove unused JavaScript: 92.5 KiB
Network Waterfall
31 requests over 908ms
INFO
0 ms 500 ms 1.0 s FCP 822 ms LCP 982 mshttps://hexo.io// https://hexo.io/ — 200 — 4.0 KiB — 215 ms — h2https://hexo.io/css/navy.css/css/navy.css https://hexo.io/css/navy.css — 200 — 5.3 KiB — 36 ms — h2https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/index.min.csscdn.jsdelivr.net/npm/typeface-lato@... https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/index.min.css — 200 — 1013 B — 13 ms — h2https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/css/all.min.csscdn.jsdelivr.net/npm/@fortawesome/f... https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/css/all.min.css — 200 — 21.8 KiB — 19 ms — h2https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.csscdn.jsdelivr.net/docsearch.js/1/doc... https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css — 200 — 4.4 KiB — 17 ms — h2https://cdn.jsdelivr.net/npm/@docsearch/css@3cdn.jsdelivr.net/npm/@docsearch/css... https://cdn.jsdelivr.net/npm/@docsearch/css@3 — 200 — 3.4 KiB — 18 ms — h2https://img.shields.io/github/stars/hexojs/hexo?style=socialimg.shields.io/github/stars/hexojs/... https://img.shields.io/github/stars/hexojs/hexo?style=social — 200 — 2.2 KiB — 52 ms — h3https://img.shields.io/github/forks/hexojs/hexo?style=socialimg.shields.io/github/forks/hexojs/... https://img.shields.io/github/forks/hexojs/hexo?style=social — 200 — 2.3 KiB — 49 ms — h3https://img.shields.io/npm/dm/hexo?logo=npm&style=socialimg.shields.io/npm/dm/hexo?logo=npm... https://img.shields.io/npm/dm/hexo?logo=npm&style=social — 200 — 1.7 KiB — 26 ms — h3https://img.shields.io/twitter/follow/hexojs?style=socialimg.shields.io/twitter/follow/hexoj... https://img.shields.io/twitter/follow/hexojs?style=social — 200 — 1.7 KiB — 28 ms — h3https://hexo.io/themes/screenshots/landscape.png/themes/screenshots/landscape.png https://hexo.io/themes/screenshots/landscape.png — 200 — 302.4 KiB — 383 ms — h2https://cdn.jsdelivr.net/npm/js-cookie@2/src/js.cookie.min.jscdn.jsdelivr.net/npm/js-cookie@2/sr... https://cdn.jsdelivr.net/npm/js-cookie@2/src/js.cookie.min.js — 200 — 1.3 KiB — 6 ms — h2https://hexo.io/js/lang_select.js/js/lang_select.js https://hexo.io/js/lang_select.js — 200 — 437 B — 48 ms — h2https://hexo.io/js/mobile_nav.js/js/mobile_nav.js https://hexo.io/js/mobile_nav.js — 200 — 512 B — 37 ms — h2https://hexo.io/js/colorScheme.js/js/colorScheme.js https://hexo.io/js/colorScheme.js — 200 — 279 B — 39 ms — h2https://cdn.jsdelivr.net/npm/@docsearch/js@3cdn.jsdelivr.net/npm/@docsearch/js@... https://cdn.jsdelivr.net/npm/@docsearch/js@3 — 200 — 35.9 KiB — 7 ms — h2https://www.netlify.com/img/global/badges/netlify-dark.svgwww.netlify.com/img/global/badges/n... https://www.netlify.com/img/global/badges/netlify-dark.svg — 301 — 360 B — 102 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 113 ms — h2https://hexo.io/logo.svg/logo.svg https://hexo.io/logo.svg — 200 — 817 B — 36 ms — h2https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-400.woff2cdn.jsdelivr.net/npm/typeface-lato@... https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-400.woff2 — 200 — 23.3 KiB — 9 ms — h3https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/webfonts/fa-brands-400.woff2cdn.jsdelivr.net/npm/@fortawesome/f... https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/webfonts/fa-brands-400.woff2 — 200 — 116.3 KiB — 19 ms — h3https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/webfonts/fa-solid-900.woff2cdn.jsdelivr.net/npm/@fortawesome/f... https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/webfonts/fa-solid-900.woff2 — 200 — 154.9 KiB — 20 ms — h3https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-300.woff2cdn.jsdelivr.net/npm/typeface-lato@... https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-300.woff2 — 200 — 23.1 KiB — 14 ms — h3https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-700.woff2cdn.jsdelivr.net/npm/typeface-lato@... https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/files/lato-latin-700.woff2 — 200 — 22.8 KiB — 12 ms — h3https://www.netlify.com/assets/badges/netlify-badge-dark.svgwww.netlify.com/assets/badges/netli... https://www.netlify.com/assets/badges/netlify-badge-dark.svg — 200 — 1.8 KiB — 34 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1384239534&t=pageview&_s=1&dl=https%3A%2F%2Fhexo.io%2F&ul=en-us&dt=Hexo&sr=800x600&vp=1350x940&_u=IEBAAEABAAAAACAAI~&jid=1657836543&gjid=83141157&cid=1244855090.1776897808&tid=UA-48498357-3&_gid=2085805965.1776897808&_r=1&_slc=1&z=1567401963www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1384239534&t=pageview&_s=1&dl=https%3A%2F%2Fhexo.io%2F&ul=en-us&dt=Hexo&sr=800x600&vp=1350x940&_u=IEBAAEABAAAAACAAI~&jid=1657836543&gjid=83141157&cid=1244855090.1776897808&tid=UA-48498357-3&_gid=2085805965.1776897808&_r=1&_slc=1&z=1567401963 — 200 — 459 B — 30 ms — h2https://www.googletagmanager.com/gtag/js?id=G-8VWFR61YDH&cx=c&_slc=1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-8VWFR61YDH&cx=c&_slc=1 — 200 — 147.9 KiB — 170 ms — h2https://region1.analytics.google.com/g/collect?v=2&tid=G-8VWFR61YDH&gtm=45je64k1v9109759904za20g&_p=1776897808290&_gaz=1&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=EBAIAGA&are=1&cid=1244855090.1776897808&frm=0&ir=1&pscdl=noapi&rcb=16&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401~117512543~117884344&dl=https%3A%2F%2Fhexo.io%2F&dt=Hexo&sid=1776897808&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=661region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-8VWFR61YDH&gtm=45je64k1v9109759904za20g&_p=1776897808290&_gaz=1&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=EBAIAGA&are=1&cid=1244855090.1776897808&frm=0&ir=1&pscdl=noapi&rcb=16&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401~117512543~117884344&dl=https%3A%2F%2Fhexo.io%2F&dt=Hexo&sid=1776897808&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=661 — 204 — 543 B — 84 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-8VWFR61YDH&cid=1244855090.1776897808&gtm=45je64k1v9109759904za20g&rcb=16&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l2l1&npa=0&frm=0&tag_exp=0~115616985~115938466~115938468~117266401~117512543~117884344stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-8VWFR61YDH&cid=1244855090.1776897808&gtm=45je64k1v9109759904za20g&rcb=16&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l2l1&npa=0&frm=0&tag_exp=0~115616985~115938466~115938468~117266401~117512543~117884344 — 204 — 552 B — 85 ms — h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-8VWFR61YDH&cid=1244855090.1776897808&gtm=45je64k1v9109759904za20g&rcb=16&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l2l1&npa=0&frm=0&tag_exp=0~115616985~115938466~115938468~117266401~117512543~117884344&z=678246495www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-8VWFR61YDH&cid=1244855090.1776897808&gtm=45je64k1v9109759904za20g&rcb=16&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l2l1&npa=0&frm=0&tag_exp=0~115616985~115938466~115938468~117266401~117512543~117884344&z=678246495 — 200 — 408 B — 89 ms — h2
0 ms 500 ms 1.0 s FCP 822 ms LCP 982 mshttps://hexo.io// https://hexo.io/ — 200 — 4.0 KiB — 215 ms — h2https://hexo.io/css/navy.css/css/navy.css https://hexo.io/css/navy.css — 200 — 5.3 KiB — 36 ms — h2https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/index.min.csscdn.jsdelivr.net/npm/typeface-lato@... https://cdn.jsdelivr.net/npm/typeface-lato@0.0.75/index.min.css — 200 — 1013 B — 13 ms — h2https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/css/all.min.csscdn.jsdelivr.net/npm/@fortawesome/f... https://cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6/css/all.min.css — 200 — 21.8 KiB — 19 ms — h2https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.csscdn.jsdelivr.net/docsearch.js/1/doc... https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css — 200 — 4.4 KiB — 17 ms — h2https://cdn.jsdelivr.net/npm/@docsearch/css@3cdn.jsdelivr.net/npm/@docsearch/css... https://cdn.jsdelivr.net/npm/@docsearch/css@3 — 200 — 3.4 KiB — 18 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
50% of JavaScript execution is third-party
First-party Third-party 76ms · 0KB · €1/mo
Unattributable
Other
Optional
Execution 76ms
Transfer 0 KB
Monthly Cost €1/mo

50% 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

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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