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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

613 ms

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

1.27 s

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

15 ms

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

0.018

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

980 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.

2.75 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
15
7 PASS 4 REVIEW 2 FIX
D
Third-Party Impact
Action
80% third-party, 0 ms blocking
FIX
80% third-party, 0 ms blocking
Warning::
Third-party code accounts for 80% of page weight (991.5 KiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
20%
80%
First-party Third-party
D
JS Bundles
Action
30 scripts, 351 KB unused
FIX
30 scripts, 351 KB unused
Warning::
https://static.buffer.com/marketing/_next/static/c...: 97 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VQSK...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-58P...: 61 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.buffer.com/marketing/_next/static/c...: 45 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 34 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 351 KB
351 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.buffer.com/marketing/_next/static/chunks/7527-7b4e1b73b11d91bb.js121 KB97 KB (80%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-VQSKXK8EGY&cx=c&gtm=4e64h1151 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-58PRD29125 KB61 KB (49%)✓3rd
https://static.buffer.com/marketing/_next/static/chunks/pages/_app-057ea8724cefdf55.js79 KB45 KB (57%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (35%)✓3rd
https://static.buffer.com/marketing/_next/static/chunks/6375-512c6a265a9f32c6.js40 KB29 KB (73%)✓3rd
https://static.buffer.com/marketing/_next/static/chunks/main-094ec27a71bfe3ad.js40 KB21 KB (54%)✓3rd
https://static.buffer.com/marketing/_next/static/chunks/5243-aac916caf63372f2.js5 KB—✓3rd
https://cdn-cookieyes.com/client_data/73a7491b50fa6e35a4e9e152/banner.js8 KB—✓3rd
https://static.buffer.com/marketing/_next/static/chunks/223-8a6c6073ca31828b.js29 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

B
Page Weight Budget
1.2 MB transferred, 67 requests
REVIEW
1.2 MB transferred, 67 requests
Info::
Page weighs 3.8 MB (1.2 MB transferred)
Warning::
JavaScript is 959 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 959 KB
Info::
67 HTTP requests
Info::
Estimated 0.25 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
67 requests
0.25 g CO2 per page load
JavaScript 958.7 KiB 77%
Images 116.4 KiB 9%
HTML 70.9 KiB 6%
Fonts 64.0 KiB 5%
CSS 19.7 KiB 2%
Other 8.0 KiB 1%
Other 3.2 KiB 0%
Other 1.7 KiB 0%
Other 1.4 KiB 0%
Other 260 B 0%
0 2.4 MB 4.9 MB
Under budget

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
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Info::
All images are well-optimized
15 images 116 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
918ms total JS execution
REVIEW
918ms total JS execution
Info::
https://buffer.com/: 233ms CPU time
Info::
https://static.buffer.com/marketing/_next/static/c...: 174ms CPU time
Info::
https://static.buffer.com/marketing/_next/static/c...: 139ms CPU time
Info::
Unattributable: 134ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-58P...: 73ms CPU time
Warning::
Third-party scripts: 684ms (75% of total)

Main Thread Breakdown

Script Evaluation 57% Other 14% Style & Layout 13% Script Parsing & Compilation 8% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://buffer.com/233ms4ms0ms1st
https://static.buffer.com/marketing/_next/static/chunks/framework-604fe8c50eb2aa78.js174ms156ms5ms3rd
https://static.buffer.com/marketing/_next/static/chunks/pages/index-2a0fe5946389d7ba.js139ms75ms2ms3rd
Unattributable134ms25ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-58PRD2973ms61ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VQSKXK8EGY&cx=c&gtm=4e64h158ms44ms14ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js55ms48ms3ms3rd
https://static.buffer.com/marketing/_next/static/chunks/main-094ec27a71bfe3ad.js51ms46ms5ms3rd
C
Page Weight Inventory
Action
67 resources · 1.2 MB · 351 KB savings available
REVIEW
67 resources · 1.2 MB · 351 KB savings available
Warning::
Page weight 220 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~351 KB of savings available
Warning::
50 third-party resources (80% of weight)
67 resources · 1.2 MiB · 50 third-party 220.3 KiB over 1MB target
JavaScript 77% · 958.7 KiB
Image 9% · 117.4 KiB
Document 6% · 70.9 KiB
Font 5% · 64.0 KiB
CSS 2% · 19.7 KiB
Other 1% · 13.6 KiB

~351.0 KiB of savings available

Remove unused JavaScript: 351.0 KiB
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
2 fonts (64 KB)
PASS
2 fonts (64 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

64 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 613 ms LCP 1.3 shttps://buffer.com/fonts/figtree/figtree-variable.ttffigtree-variable.ttf https://buffer.com/fonts/figtree/figtree-variable.ttf — 35.8 KiB — 184 ms — font-display: swaphttps://buffer.com/fonts/stolzl/stolzl-regular.woff2stolzl-regular.woff2 https://buffer.com/fonts/stolzl/stolzl-regular.woff2 — 28.3 KiB — 157 ms — font-display: swap
figtree-variable.ttf ttf swap
Size 36 KB
Load time 184 ms
Start 260 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
stolzl-regular.woff2 woff2 swap
Size 28 KB
Load time 157 ms
Start 261 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 ~11 KB and ~22 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=14400 (4 hours)
PASS
max-age=14400 (4 hours)
Info::
Cache-Control header is set
Got: public, max-age=14400
Info::
Effective TTL: 4 hours (max-age=14400)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=14400

DirectiveValueMeaning
public—Any cache may store this response
max-age14400Cache for 4 hours
Effective TTL: 14400 seconds
Network Waterfall
67 requests over 2056ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 613 ms LCP 1.3 shttps://buffer.com// https://buffer.com/ — 200 — 70.9 KiB — 62 ms — h3https://static.buffer.com/marketing/_next/static/css/eb35c95447a7c7c9.cssstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/css/eb35c95447a7c7c9.css — 200 — 5.8 KiB — 50 ms — h3https://static.buffer.com/marketing/_next/static/css/14b74945a0ad05da.cssstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/css/14b74945a0ad05da.css — 200 — 5.8 KiB — 56 ms — h3https://static.buffer.com/marketing/_next/static/css/5f48e04623e80530.cssstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/css/5f48e04623e80530.css — 200 — 8.1 KiB — 52 ms — h3https://static.buffer.com/marketing/_next/static/chunks/webpack-3d7d3ea3ca6b6c97.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/webpack-3d7d3ea3ca6b6c97.js — 200 — 1.5 KiB — 37 ms — h3https://static.buffer.com/marketing/_next/static/chunks/framework-604fe8c50eb2aa78.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/framework-604fe8c50eb2aa78.js — 200 — 45.0 KiB — 57 ms — h3https://static.buffer.com/marketing/_next/static/chunks/main-094ec27a71bfe3ad.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/main-094ec27a71bfe3ad.js — 200 — 39.7 KiB — 57 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 26 ms — h2https://buffer.com/icons/site.webmanifest/icons/site.webmanifest https://buffer.com/icons/site.webmanifest — 200 — 1.4 KiB — 176 ms — h3https://static.buffer.com/marketing/_next/static/chunks/pages/_app-057ea8724cefdf55.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/pages/_app-057ea8724cefdf55.js — 200 — 79.1 KiB — 76 ms — h3https://static.buffer.com/marketing/_next/static/chunks/7527-7b4e1b73b11d91bb.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/7527-7b4e1b73b11d91bb.js — 200 — 121.1 KiB — 76 ms — h3https://static.buffer.com/marketing/_next/static/chunks/8370-c70dc1b29cfd9883.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/8370-c70dc1b29cfd9883.js — 200 — 4.4 KiB — 44 ms — h3https://static.buffer.com/marketing/_next/static/chunks/5243-aac916caf63372f2.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/5243-aac916caf63372f2.js — 200 — 4.6 KiB — 41 ms — h3https://static.buffer.com/marketing/_next/static/chunks/6375-512c6a265a9f32c6.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/6375-512c6a265a9f32c6.js — 200 — 39.6 KiB — 66 ms — h3https://static.buffer.com/marketing/_next/static/chunks/223-8a6c6073ca31828b.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/223-8a6c6073ca31828b.js — 200 — 28.9 KiB — 63 ms — h3https://static.buffer.com/marketing/_next/static/chunks/1463-5827dd93078c9d76.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/1463-5827dd93078c9d76.js — 200 — 5.1 KiB — 53 ms — h3https://static.buffer.com/marketing/_next/static/chunks/pages/index-2a0fe5946389d7ba.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/pages/index-2a0fe5946389d7ba.js — 200 — 10.9 KiB — 59 ms — h3https://static.buffer.com/marketing/_next/static/mrnspFmY5eqUJCjBZitlT/_buildManifest.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/mrnspFmY5eqUJCjBZitlT/_buildManifest.js — 200 — 5.8 KiB — 74 ms — h3https://static.buffer.com/marketing/_next/static/mrnspFmY5eqUJCjBZitlT/_ssgManifest.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/mrnspFmY5eqUJCjBZitlT/_ssgManifest.js — 200 — 695 B — 74 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/publish-composer.webp/cdn-cgi/image/width=640,quality=75... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/publish-composer.webp — 200 — 18.2 KiB — 52 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/create-ideas.webp/cdn-cgi/image/width=640,quality=75... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/create-ideas.webp — 200 — 22.6 KiB — 60 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/community-comments.webp/cdn-cgi/image/width=640,quality=75... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/community-comments.webp — 200 — 20.7 KiB — 51 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/insights.webp/cdn-cgi/image/width=640,quality=75... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/insights.webp — 200 — 17.6 KiB — 44 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/collaborate.webp/cdn-cgi/image/width=640,quality=75... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/collaborate.webp — 200 — 7.1 KiB — 51 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/mobile-app.webp/cdn-cgi/image/width=640,quality=75... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/mobile-app.webp — 200 — 8.5 KiB — 44 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/start-page.webp/cdn-cgi/image/width=640,quality=75... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/start-page.webp — 200 — 9.4 KiB — 72 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/ai-assistant.webp/cdn-cgi/image/width=640,quality=75... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/ai-assistant.webp — 200 — 5.7 KiB — 57 ms — h3https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/rita-iglesias.webp/cdn-cgi/image/width=96,quality=75,... https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/rita-iglesias.webp — 200 — 1.9 KiB — 71 ms — h3https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/paul-de-la-baume.webp/cdn-cgi/image/width=96,quality=75,... https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/paul-de-la-baume.webp — 200 — 1.7 KiB — 49 ms — h3https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/yola-bastos.webp/cdn-cgi/image/width=96,quality=75,... https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/yola-bastos.webp — 200 — 1.9 KiB — 70 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 613 ms LCP 1.3 shttps://buffer.com// https://buffer.com/ — 200 — 70.9 KiB — 62 ms — h3https://static.buffer.com/marketing/_next/static/css/eb35c95447a7c7c9.cssstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/css/eb35c95447a7c7c9.css — 200 — 5.8 KiB — 50 ms — h3https://static.buffer.com/marketing/_next/static/css/14b74945a0ad05da.cssstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/css/14b74945a0ad05da.css — 200 — 5.8 KiB — 56 ms — h3https://static.buffer.com/marketing/_next/static/css/5f48e04623e80530.cssstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/css/5f48e04623e80530.css — 200 — 8.1 KiB — 52 ms — h3https://static.buffer.com/marketing/_next/static/chunks/webpack-3d7d3ea3ca6b6c97.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/webpack-3d7d3ea3ca6b6c97.js — 200 — 1.5 KiB — 37 ms — h3https://static.buffer.com/marketing/_next/static/chunks/framework-604fe8c50eb2aa78.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/framework-604fe8c50eb2aa78.js — 200 — 45.0 KiB — 57 ms — h3https://static.buffer.com/marketing/_next/static/chunks/main-094ec27a71bfe3ad.jsstatic.buffer.com/marketing/_next/s... https://static.buffer.com/marketing/_next/static/chunks/main-094ec27a71bfe3ad.js — 200 — 39.7 KiB — 57 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 26 ms — h2https://buffer.com/icons/site.webmanifest/icons/site.webmanifest https://buffer.com/icons/site.webmanifest — 200 — 1.4 KiB — 176 ms — h3https://static.buffer.com/marketing/_next/static/chunks/pages/_app-057ea8724cefdf55.jsstatic.buffer.com/marketing/_next/s... 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https://www.google-analytics.com/g/collect?v=2&tid=G-VQSKXK8EGY&gtm=45je64h1v875042219z878572419za20gzb78572419zd78572419&_p=1776802453954&gcs=G111&gcd=13r3r3r3r5l1&npa=0&dma=0&gdid=dY2Q2ZW&are=1&cid=1070716038.1776802455&frm=0&pscdl=noapi&rcb=4&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=0~115616986~115938465~115938469~117266400&sid=1776802454&sct=1&seg=0&dl=https%3A%2F%2Fbuffer.com%2F&dt=Buffer%3A%20Social%20media%20management%20for%20everyone&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1238 — 204 — 554 B — 137 ms — h2https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=406FAB250C11459D8F322F0EF559E2A2&RedC=c.clarity.ms&MXFR=100393D1CEFB6A852A268493CAFB647Cc.bing.com/c.gif?ctsa=mr&CtsSyncId=... https://c.bing.com/c.gif?ctsa=mr&CtsSyncId=406FAB250C11459D8F322F0EF559E2A2&RedC=c.clarity.ms&MXFR=100393D1CEFB6A852A268493CAFB647C — 302 — 766 B — 156 ms — h2https://px.ads.linkedin.com/collect?v=2&fmt=js&pid=8789602&time=1776802454383&li_adsId=d36a599a-313b-4f46-b5d8-8aae2fcfe0d5&url=https%3A%2F%2Fbuffer.com%2F&cookiesTest=truepx.ads.linkedin.com/collect?v=2&fmt... https://px.ads.linkedin.com/collect?v=2&fmt=js&pid=8789602&time=1776802454383&li_adsId=d36a599a-313b-4f46-b5d8-8aae2fcfe0d5&url=https%3A%2F%2Fbuffer.com%2F&cookiesTest=true — 200 — 451 B — 139 ms — h2https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=406FAB250C11459D8F322F0EF559E2A2&MUID=046BE2B58EEF6D5829D9F5F78F366C03c.clarity.ms/c.gif?ctsa=mr&CtsSyncI... https://c.clarity.ms/c.gif?ctsa=mr&CtsSyncId=406FAB250C11459D8F322F0EF559E2A2&MUID=046BE2B58EEF6D5829D9F5F78F366C03 — 200 — 467 B — 118 ms — h2https://px.ads.linkedin.com/wa/?medium=fetch&fmt=gpx.ads.linkedin.com/wa/?medium=fetc... https://px.ads.linkedin.com/wa/?medium=fetch&fmt=g — 204 — 43 B — 214 ms — h3https://b.clarity.ms/collectb.clarity.ms/collect https://b.clarity.ms/collect — 204 — 274 B — 351 ms — http/1.1https://b.clarity.ms/collectb.clarity.ms/collect https://b.clarity.ms/collect — 204 — 274 B — 399 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
75% of JavaScript execution is third-party
First-party Third-party 684ms · 398KB · €12/mo
static.buffer.com
Other
Optional
Execution 174ms
Transfer 45 KB
Monthly Cost €3/mo
static.buffer.com
Other
Optional
Execution 139ms
Transfer 11 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 134ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 125 KB
Unused 49%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 151 KB
Unused 43%
Monthly Cost €1/mo
Microsoft Clarity
Session Replay
Optional
Execution 55ms
Transfer 26 KB
Monthly Cost €1/mo
static.buffer.com
Other
Optional
Execution 51ms
Transfer 40 KB
Unused 54%
Monthly Cost €1/mo

75% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

54% of static.buffer.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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