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https://joinmastodon.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
1
REVIEW
3
PASS
11
INFO
2

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

Mobile Desktop
76
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
83
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.

1.22 s

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

4.85 s

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

288 ms

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

0.051

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

1.42 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.

5.65 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
17
11 PASS 3 REVIEW 1 FIX
D
JS Execution Cost
Action
2224ms total JS execution
FIX
2224ms total JS execution
Warning::
https://joinmastodon.org/: 811ms CPU time
Warning::
https://joinmastodon.org/_next/static/chunks/frame...: 549ms CPU time
Warning::
Unattributable: 416ms CPU time
Info::
https://joinmastodon.org/_next/static/chunks/main-...: 200ms CPU time
Info::
https://joinmastodon.org/_next/static/chunks/pages...: 105ms CPU time
Info::
Third-party scripts: 416ms (19% of total)

Main Thread Breakdown

Script Evaluation 44% Style & Layout 24% Other 21% Script Parsing & Compilation 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://joinmastodon.org/811ms55ms1ms1st
https://joinmastodon.org/_next/static/chunks/framework-1ce91eb6f9ecda85.js549ms504ms20ms1st
Unattributable416ms25ms0ms3rd
https://joinmastodon.org/_next/static/chunks/main-ee4a8c97ebc7ec18.js200ms163ms20ms1st
https://joinmastodon.org/_next/static/chunks/pages/index-329a00464feea170.js105ms99ms5ms1st
https://joinmastodon.org/_next/static/chunks/pages/servers-cb51a6845366132b.js88ms84ms3ms1st
https://joinmastodon.org/_next/static/chunks/pages/_app-81d06eba5a50a9ee.js56ms39ms16ms1st
B
Page Weight Budget
1.2 MB transferred, 52 requests
REVIEW
1.2 MB transferred, 52 requests
Info::
Page weighs 1.8 MB (1.2 MB transferred)
Info::
52 HTTP requests
Info::
Estimated 0.25 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
52 requests
0.25 g CO2 per page load
Images 897.2 KiB 74%
JavaScript 183.0 KiB 15%
Other 61.2 KiB 5%
Fonts 49.7 KiB 4%
HTML 13.4 KiB 1%
CSS 9.3 KiB 1%
Other 823 B 0%
0 2.4 MB 4.9 MB
Under budget
B
JS Bundles
32 scripts, 139 KB unused
REVIEW
32 scripts, 139 KB unused
Warning::
https://joinmastodon.org/_next/static/chunks/223-8...: 48 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://joinmastodon.org/_next/static/chunks/223-8...: 48 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://joinmastodon.org/_next/static/chunks/463-4...: 22 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://joinmastodon.org/_next/static/chunks/463-4...: 22 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 139 KB
139 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://joinmastodon.org/_next/static/chunks/223-8dfb04dccb7295c1.js0 KB48 KB (92%)✓1st
https://joinmastodon.org/_next/static/chunks/223-8dfb04dccb7295c1.js18 KB48 KB (92%)✓1st
https://joinmastodon.org/_next/static/chunks/463-4d4fbcf0cfd07cb2.js10 KB22 KB (82%)✓1st
https://joinmastodon.org/_next/static/chunks/463-4d4fbcf0cfd07cb2.js0 KB22 KB (82%)✓1st
https://joinmastodon.org/_next/static/chunks/07c2d338-e946331cef3076e6.js3 KB—✓1st
https://joinmastodon.org/_next/static/chunks/290-f30726857f74c776.js7 KB—✓1st
https://joinmastodon.org/_next/static/chunks/208-56d29e0b49b40b32.js4 KB—✓1st
https://joinmastodon.org/_next/static/chunks/653-43826e7c7586c064.js8 KB—✓1st
https://joinmastodon.org/_next/static/chunks/443-4e5bdf315de09195.js19 KB—✓1st
https://joinmastodon.org/_next/static/chunks/834-7e0826e6278794a7.js7 KB—✓1st

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
HTTP Caching
s-maxage=300, stale-while-revalidate=31535700
REVIEW
s-maxage=300, stale-while-revalidate=31535700
Info::
Cache-Control header is set
Got: s-maxage=300, stale-while-revalidate=31535700
Info::
CDN TTL: 5 minutes (s-maxage=300)
Info::
ETag present — enables conditional (304) responses
Cache-Control

s-maxage=300, stale-while-revalidate=31535700

DirectiveValueMeaning
s-maxage300CDN caches for 5 minutes
stale-while-revalidate31535700Serve stale for 52 weeks while fetching fresh
A+
Third-Party Impact
1% third-party, 0 ms blocking
PASS
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (7.2 KiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
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
10 images, 0 KB saveable
PASS
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 897 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
1 fonts (50 KB)
PASS
1 fonts (50 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

50 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.2 s LCP 4.8 shttps://joinmastodon.org/fonts/manrope-variable.woff2manrope-variable.woff2 https://joinmastodon.org/fonts/manrope-variable.woff2 — 49.7 KiB — 12 ms — font-display: swap
manrope-variable.woff2 woff2 swap
Size 50 KB
Load time 12 ms
Start 191 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
17 hints, 0 missing preconnects
PASS
17 hints, 0 missing preconnects
Info::
Page uses 17 resource hint(s)

Current Resource Hints

preconnect
—
preload
4
dns-prefetch
—
prefetch
+3
13

17 resource hints configured

A
Page Weight Inventory
52 resources · 1.2 MB · 139 KB savings available
PASS
52 resources · 1.2 MB · 139 KB savings available
Warning::
Page weight 191 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~139 KB of savings available
Info::
10 third-party resources (1% of weight)
Info::
1 resources over 200KB
52 resources · 1.2 MiB · 10 third-party 190.6 KiB over 1MB target
Image 74% · 899.4 KiB
JavaScript 20% · 242.0 KiB
Font 4% · 49.7 KiB
Document 1% · 13.4 KiB
CSS 1% · 9.3 KiB
Other 0% · 823 B

~139.3 KiB of savings available

Remove unused JavaScript: 139.3 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Axis12 Ltd

Network Waterfall
52 requests over 684ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.2 s LCP 4.8 shttps://joinmastodon.org// https://joinmastodon.org/ — 200 — 13.4 KiB — 13 ms — h2https://joinmastodon.org/_next/static/media/home_hero_mobile.76a87209.webp/_next/static/media/home_hero_mobil... https://joinmastodon.org/_next/static/media/home_hero_mobile.76a87209.webp — 200 — 47.7 KiB — 24 ms — h2https://joinmastodon.org/_next/static/media/home_hero_desktop.2632cca0.png/_next/static/media/home_hero_deskt... https://joinmastodon.org/_next/static/media/home_hero_desktop.2632cca0.png — 200 — 723.2 KiB — 113 ms — h2https://joinmastodon.org/_next/static/css/3992710abe57951b.css/_next/static/css/3992710abe57951b.... https://joinmastodon.org/_next/static/css/3992710abe57951b.css — 200 — 9.0 KiB — 7 ms — h2https://joinmastodon.org/_next/static/css/b8e302d41b271438.css/_next/static/css/b8e302d41b271438.... https://joinmastodon.org/_next/static/css/b8e302d41b271438.css — 200 — 293 B — 9 ms — h2https://joinmastodon.org/_next/static/chunks/webpack-06c5c96a03e9f041.js/_next/static/chunks/webpack-06c5c9... https://joinmastodon.org/_next/static/chunks/webpack-06c5c96a03e9f041.js — 200 — 1.3 KiB — 38 ms — h3https://joinmastodon.org/_next/static/chunks/framework-1ce91eb6f9ecda85.js/_next/static/chunks/framework-1ce9... https://joinmastodon.org/_next/static/chunks/framework-1ce91eb6f9ecda85.js — 200 — 41.9 KiB — 76 ms — h3https://joinmastodon.org/_next/static/chunks/main-ee4a8c97ebc7ec18.js/_next/static/chunks/main-ee4a8c97e... https://joinmastodon.org/_next/static/chunks/main-ee4a8c97ebc7ec18.js — 200 — 34.1 KiB — 72 ms — h3https://joinmastodon.org/_next/static/chunks/pages/_app-81d06eba5a50a9ee.js/_next/static/chunks/pages/_app-81d... https://joinmastodon.org/_next/static/chunks/pages/_app-81d06eba5a50a9ee.js — 200 — 24.7 KiB — 81 ms — h3https://joinmastodon.org/_next/static/chunks/173-2d2a59a8545e12a4.js/_next/static/chunks/173-2d2a59a854... https://joinmastodon.org/_next/static/chunks/173-2d2a59a8545e12a4.js — 200 — 4.9 KiB — 59 ms — h3https://joinmastodon.org/_next/static/chunks/230-50714b1108760e10.js/_next/static/chunks/230-50714b1108... https://joinmastodon.org/_next/static/chunks/230-50714b1108760e10.js — 200 — 2.6 KiB — 61 ms — h3https://joinmastodon.org/_next/static/chunks/208-56d29e0b49b40b32.js/_next/static/chunks/208-56d29e0b49... https://joinmastodon.org/_next/static/chunks/208-56d29e0b49b40b32.js — 200 — 3.8 KiB — 60 ms — h3data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%273…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%273… — 200 — 0 B — 0 ms — datahttps://joinmastodon.org/_next/static/chunks/653-43826e7c7586c064.js/_next/static/chunks/653-43826e7c75... https://joinmastodon.org/_next/static/chunks/653-43826e7c7586c064.js — 200 — 8.4 KiB — 37 ms — h3data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 — 200 — 0 B — 0 ms — datahttps://joinmastodon.org/_next/static/chunks/443-4e5bdf315de09195.js/_next/static/chunks/443-4e5bdf315d... https://joinmastodon.org/_next/static/chunks/443-4e5bdf315de09195.js — 200 — 18.6 KiB — 80 ms — h3https://joinmastodon.org/_next/static/chunks/834-7e0826e6278794a7.js/_next/static/chunks/834-7e0826e627... https://joinmastodon.org/_next/static/chunks/834-7e0826e6278794a7.js — 200 — 7.2 KiB — 59 ms — h3https://joinmastodon.org/_next/static/chunks/827-d81ea7764e8cf952.js/_next/static/chunks/827-d81ea7764e... https://joinmastodon.org/_next/static/chunks/827-d81ea7764e8cf952.js — 200 — 17.0 KiB — 73 ms — h3https://joinmastodon.org/_next/static/chunks/pages/index-329a00464feea170.js/_next/static/chunks/pages/index-32... https://joinmastodon.org/_next/static/chunks/pages/index-329a00464feea170.js — 200 — 9.5 KiB — 59 ms — h3https://joinmastodon.org/_next/static/_L-LMDMgcQx5G4GCgHYMk/_buildManifest.js/_next/static/_L-LMDMgcQx5G4GCgHYMk... https://joinmastodon.org/_next/static/_L-LMDMgcQx5G4GCgHYMk/_buildManifest.js — 200 — 1.5 KiB — 73 ms — h3data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%279…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%279… — 200 — 0 B — 0 ms — datahttps://joinmastodon.org/_next/static/_L-LMDMgcQx5G4GCgHYMk/_ssgManifest.js/_next/static/_L-LMDMgcQx5G4GCgHYMk... https://joinmastodon.org/_next/static/_L-LMDMgcQx5G4GCgHYMk/_ssgManifest.js — 200 — 534 B — 74 ms — h3https://scripts.simpleanalyticscdn.com/latest.jsscripts.simpleanalyticscdn.com/late... https://scripts.simpleanalyticscdn.com/latest.js — 200 — 4.8 KiB — 85 ms — h2https://scripts.simpleanalyticscdn.com/auto-events.jsscripts.simpleanalyticscdn.com/auto... https://scripts.simpleanalyticscdn.com/auto-events.js — 200 — 2.1 KiB — 81 ms — h2data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%271…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%271… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%271…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%271… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%271…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%271… — 200 — 0 B — 0 ms — datadata:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%277…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%277… — 200 — 0 B — 0 ms — datahttps://joinmastodon.org/fonts/manrope-variable.woff2/fonts/manrope-variable.woff2 https://joinmastodon.org/fonts/manrope-variable.woff2 — 200 — 49.7 KiB — 12 ms — h3https://joinmastodon.org/_next/static/media/wordmark-white-text.01e9f493.svg/_next/static/media/wordmark-white-... https://joinmastodon.org/_next/static/media/wordmark-white-text.01e9f493.svg — 200 — 3.4 KiB — 25 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.2 s LCP 4.8 shttps://joinmastodon.org// https://joinmastodon.org/ — 200 — 13.4 KiB — 13 ms — h2https://joinmastodon.org/_next/static/media/home_hero_mobile.76a87209.webp/_next/static/media/home_hero_mobil... https://joinmastodon.org/_next/static/media/home_hero_mobile.76a87209.webp — 200 — 47.7 KiB — 24 ms — h2https://joinmastodon.org/_next/static/media/home_hero_desktop.2632cca0.png/_next/static/media/home_hero_deskt... https://joinmastodon.org/_next/static/media/home_hero_desktop.2632cca0.png — 200 — 723.2 KiB — 113 ms — h2https://joinmastodon.org/_next/static/css/3992710abe57951b.css/_next/static/css/3992710abe57951b.... https://joinmastodon.org/_next/static/css/3992710abe57951b.css — 200 — 9.0 KiB — 7 ms — h2https://joinmastodon.org/_next/static/css/b8e302d41b271438.css/_next/static/css/b8e302d41b271438.... https://joinmastodon.org/_next/static/css/b8e302d41b271438.css — 200 — 293 B — 9 ms — h2https://joinmastodon.org/_next/static/chunks/webpack-06c5c96a03e9f041.js/_next/static/chunks/webpack-06c5c9... https://joinmastodon.org/_next/static/chunks/webpack-06c5c96a03e9f041.js — 200 — 1.3 KiB — 38 ms — h3https://joinmastodon.org/_next/static/chunks/framework-1ce91eb6f9ecda85.js/_next/static/chunks/framework-1ce9... https://joinmastodon.org/_next/static/chunks/framework-1ce91eb6f9ecda85.js — 200 — 41.9 KiB — 76 ms — h3https://joinmastodon.org/_next/static/chunks/main-ee4a8c97ebc7ec18.js/_next/static/chunks/main-ee4a8c97e... https://joinmastodon.org/_next/static/chunks/main-ee4a8c97ebc7ec18.js — 200 — 34.1 KiB — 72 ms — h3https://joinmastodon.org/_next/static/chunks/pages/_app-81d06eba5a50a9ee.js/_next/static/chunks/pages/_app-81d... https://joinmastodon.org/_next/static/chunks/pages/_app-81d06eba5a50a9ee.js — 200 — 24.7 KiB — 81 ms — h3https://joinmastodon.org/_next/static/chunks/173-2d2a59a8545e12a4.js/_next/static/chunks/173-2d2a59a854... https://joinmastodon.org/_next/static/chunks/173-2d2a59a8545e12a4.js — 200 — 4.9 KiB — 59 ms — h3https://joinmastodon.org/_next/static/chunks/230-50714b1108760e10.js/_next/static/chunks/230-50714b1108... https://joinmastodon.org/_next/static/chunks/230-50714b1108760e10.js — 200 — 2.6 KiB — 61 ms — h3https://joinmastodon.org/_next/static/chunks/208-56d29e0b49b40b32.js/_next/static/chunks/208-56d29e0b49... https://joinmastodon.org/_next/static/chunks/208-56d29e0b49b40b32.js — 200 — 3.8 KiB — 60 ms — h3data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%273…www.w3.org/2000/svg%27%20version=%2... data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%273… — 200 — 0 B — 0 ms — datahttps://joinmastodon.org/_next/static/chunks/653-43826e7c7586c064.js/_next/static/chunks/653-43826e7c75... https://joinmastodon.org/_next/static/chunks/653-43826e7c7586c064.js — 200 — 8.4 KiB — 37 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
19% of JavaScript execution is third-party
First-party Third-party 416ms · 0KB · €5/mo
Unattributable
Other
Costly
Execution 416ms
Transfer 0 KB
Monthly Cost €5/mo

These scripts may cost more than they're worth

  • Unattributable adds 416ms and costs ~€5/month

Unattributable takes 416ms 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

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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