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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
2
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
94
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.
100
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.

808 ms

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

1.48 s

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

43 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.

1.02 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.

1.56 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
8 PASS 3 REVIEW 2 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (905.9 KiB of 906.0 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
JS Execution Cost
Action
1059ms total JS execution
REVIEW
1059ms total JS execution
Warning::
https://buffer.com/: 345ms CPU time
Info::
https://static.buffer.com/marketing/_next/static/c...: 245ms CPU time
Info::
https://static.buffer.com/marketing/_next/static/c...: 202ms CPU time
Info::
Unattributable: 143ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-58P...: 67ms CPU time
Warning::
Third-party scripts: 1059ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 22% Style & Layout 18% Rendering 7% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://buffer.com/345ms6ms0ms3rd
https://static.buffer.com/marketing/_next/static/chunks/pages/index-2a0fe5946389d7ba.js245ms100ms2ms3rd
https://static.buffer.com/marketing/_next/static/chunks/framework-604fe8c50eb2aa78.js202ms184ms8ms3rd
Unattributable143ms8ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-58PRD2967ms45ms22ms3rd
https://static.buffer.com/marketing/_next/static/chunks/main-094ec27a71bfe3ad.js58ms52ms6ms3rd
C
JS Bundles
Action
21 scripts, 259 KB unused
REVIEW
21 scripts, 259 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/gtm.js?id=GTM-58P...: 68 KB unused (54%)
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://static.buffer.com/marketing/_next/static/c...: 29 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.buffer.com/marketing/_next/static/c...: 21 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 259 KB
259 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/gtm.js?id=GTM-58PRD29125 KB68 KB (54%)✓3rd
https://static.buffer.com/marketing/_next/static/chunks/pages/_app-057ea8724cefdf55.js79 KB45 KB (57%)✓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/8370-c70dc1b29cfd9883.js4 KB—✓3rd
https://static.buffer.com/marketing/_next/static/mrnspFmY5eqUJCjBZitlT/_buildManifest.js6 KB—✓3rd
https://static.buffer.com/marketing/_next/static/chunks/5243-aac916caf63372f2.js5 KB—✓3rd
https://static.buffer.com/marketing/_next/static/chunks/framework-604fe8c50eb2aa78.js45 KB—✓3rd
https://static.buffer.com/marketing/_next/static/chunks/1463-5827dd93078c9d76.js5 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 Inventory
54 resources · 906 KB · 259 KB savings available
REVIEW
54 resources · 906 KB · 259 KB savings available
Info::
Within 1MB page-weight target
Got: 906 KB
Info::
~259 KB of savings available
Warning::
53 third-party resources (100% of weight)
54 resources · 906.0 KiB · 53 third-party Within 1MB page-weight target
JavaScript 64% · 578.0 KiB
Image 13% · 119.8 KiB
Font 11% · 100.1 KiB
Document 8% · 71.0 KiB
CSS 2% · 19.8 KiB
Other 2% · 17.3 KiB

~259.0 KiB of savings available

Remove unused JavaScript: 259.0 KiB
A
Page Weight Budget
906 KB transferred, 54 requests
PASS
906 KB transferred, 54 requests
Info::
Page weighs 2.7 MB (906 KB transferred)
Warning::
JavaScript is 578 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 578 KB
Info::
54 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
906 KB / 2.4 MB budget
906 KB transferred
54 requests
0.19 g CO2 per page load
JavaScript 578.0 KiB 64%
Images 118.8 KiB 13%
Fonts 100.1 KiB 11%
HTML 71.0 KiB 8%
CSS 19.8 KiB 2%
Other 15.4 KiB 2%
Other 1.4 KiB 0%
Other 1.1 KiB 0%
Other 260 B 0%
Other 208 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

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
Image Optimization
14 images, 0 KB saveable
PASS
14 images, 0 KB saveable
Info::
All images are well-optimized
14 images 119 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (100 KB)
PASS
3 fonts (100 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

100 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 808 ms LCP 1.5 shttps://buffer.com/fonts/figtree/figtree-variable.ttffigtree-variable.ttf https://buffer.com/fonts/figtree/figtree-variable.ttf — 35.8 KiB — 154 ms — font-display: swaphttps://buffer.com/fonts/stolzl/stolzl-regular.woff2stolzl-regular.woff2 https://buffer.com/fonts/stolzl/stolzl-regular.woff2 — 28.3 KiB — 154 ms — font-display: swaphttps://buffer.com/fonts/figtree/figtree-variable-italic.ttffigtree-variable-italic... https://buffer.com/fonts/figtree/figtree-variable-italic.ttf — 36.1 KiB — 139 ms — font-display: swap
figtree-variable.ttf ttf swap
Size 36 KB
Load time 154 ms
Start 305 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 154 ms
Start 306 ms
Risk FOUT — text flashes from fallback to web font
figtree-variable-italic... ttf swap
Size 36 KB
Load time 139 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~22 KB and ~44 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

Network Waterfall
54 requests over 2098ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 808 ms LCP 1.5 shttps://bufferapp.com// https://bufferapp.com/ — 301 — 91 B — 19 ms — h2https://buffer.com/buffer.com/ https://buffer.com/ — 200 — 71.0 KiB — 51 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 — 53 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 — 5.9 KiB — 57 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 — 63 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 — 54 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 — 56 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 — 56 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 28 ms — h2https://buffer.com/icons/site.webmanifestbuffer.com/icons/site.webmanifest https://buffer.com/icons/site.webmanifest — 200 — 1.4 KiB — 154 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 — 79.2 KiB — 64 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 — 121.2 KiB — 72 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 — 29 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 — 47 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 — 39.7 KiB — 68 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 — 29.1 KiB — 53 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 — 5.2 KiB — 47 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 — 10.8 KiB — 41 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 — 5.9 KiB — 69 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 — 714 B — 41 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/publish-composer.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/publish-composer.webp — 200 — 18.2 KiB — 41 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/create-ideas.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/create-ideas.webp — 200 — 22.7 KiB — 51 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/community-comments.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/community-comments.webp — 200 — 20.7 KiB — 57 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/insights.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/insights.webp — 200 — 17.6 KiB — 50 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/collaborate.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/collaborate.webp — 200 — 7.1 KiB — 68 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/mobile-app.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/mobile-app.webp — 200 — 8.5 KiB — 60 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/start-page.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/start-page.webp — 200 — 9.4 KiB — 50 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/ai-assistant.webpbuffer.com/cdn-cgi/image/width=640,... 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.webpbuffer.com/cdn-cgi/image/width=96,q... https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/rita-iglesias.webp — 200 — 1.9 KiB — 58 ms — h3https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/paul-de-la-baume.webpbuffer.com/cdn-cgi/image/width=96,q... https://buffer.com/cdn-cgi/image/width=96,quality=75,format=auto//img/testimonials/paul-de-la-baume.webp — 200 — 1.7 KiB — 37 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 808 ms LCP 1.5 shttps://bufferapp.com// https://bufferapp.com/ — 301 — 91 B — 19 ms — h2https://buffer.com/buffer.com/ https://buffer.com/ — 200 — 71.0 KiB — 51 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 — 53 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 — 5.9 KiB — 57 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 — 63 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 — 54 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 — 56 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 — 56 ms — h3https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 28 ms — h2https://buffer.com/icons/site.webmanifestbuffer.com/icons/site.webmanifest https://buffer.com/icons/site.webmanifest — 200 — 1.4 KiB — 154 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 — 79.2 KiB — 64 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 — 121.2 KiB — 72 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 — 29 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 — 47 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 — 39.7 KiB — 68 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 — 29.1 KiB — 53 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 — 5.2 KiB — 47 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 — 10.8 KiB — 41 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 — 5.9 KiB — 69 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 — 714 B — 41 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/publish-composer.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/publish-composer.webp — 200 — 18.2 KiB — 41 ms — h3https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/create-ideas.webpbuffer.com/cdn-cgi/image/width=640,... https://buffer.com/cdn-cgi/image/width=640,quality=75,format=auto//img/homepage/create-ideas.webp — 200 — 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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
100% of JavaScript execution is third-party
First-party Third-party 1059ms · 292KB · €18/mo
buffer.com
Other
Costly
Execution 345ms
Transfer 71 KB
Monthly Cost €6/mo
static.buffer.com
Other
Costly
Execution 245ms
Transfer 11 KB
Monthly Cost €4/mo
static.buffer.com
Other
Costly
Execution 202ms
Transfer 45 KB
Monthly Cost €4/mo
Unattributable
Other
Optional
Execution 143ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 67ms
Transfer 125 KB
Unused 54%
Monthly Cost €1/mo
static.buffer.com
Other
Optional
Execution 58ms
Transfer 40 KB
Unused 54%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • buffer.com adds 345ms and costs ~€6/month
  • static.buffer.com adds 245ms and costs ~€4/month
  • static.buffer.com adds 202ms and costs ~€4/month

100% 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

buffer.com takes 345ms 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

static.buffer.com takes 245ms 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

static.buffer.com takes 202ms 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

54% 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

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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