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https://www.obsidian.md

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
3
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
59
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
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.

2.02 s

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

3.56 s

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

6.81 s

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

0.000

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

2.02 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.

14.76 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
16
9 PASS 2 REVIEW 3 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 (616.7 KiB of 617.1 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
13065ms total JS execution
FIX
13065ms total JS execution
Warning::
https://obsidian.md/graph.js?v=2: 12166ms CPU time
Warning::
https://obsidian.md/: 382ms CPU time
Warning::
Unattributable: 259ms CPU time
Info::
https://obsidian.md/pixi.min.js: 134ms CPU time
Info::
https://obsidian.md/static.js?v=0a5b3842: 124ms CPU time
Warning::
Third-party scripts: 13065ms (100% of total)

Main Thread Breakdown

Other 80% Script Evaluation 16%
ScriptTotalScriptingParse/CompileParty
https://obsidian.md/graph.js?v=212166ms1928ms2ms3rd
https://obsidian.md/382ms67ms6ms3rd
Unattributable259ms5ms0ms3rd
https://obsidian.md/pixi.min.js134ms83ms51ms3rd
https://obsidian.md/static.js?v=0a5b3842124ms25ms7ms3rd
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.

B
Image Optimization
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Info::
All images are well-optimized
6 images 298 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
B
JS Bundles
5 scripts, 86 KB unused
REVIEW
5 scripts, 86 KB unused
Warning::
https://obsidian.md/pixi.min.js: 86 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 86 KB
86 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://obsidian.md/pixi.min.js142 KB86 KB (61%)✓3rd
https://obsidian.md/static.js?v=0a5b384214 KB—✓3rd
https://obsidian.md/download.js1 KB—✓3rd
https://obsidian.md/graph.js?v=210 KB—✓3rd
https://obsidian.md/sim.js1 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

A+
Page Weight Budget
617 KB transferred, 16 requests
PASS
617 KB transferred, 16 requests
Info::
Page weighs 1.2 MB (617 KB transferred)
Info::
16 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
617 KB / 2.4 MB budget
617 KB transferred
16 requests
0.13 g CO2 per page load
Images 297.6 KiB 48%
JavaScript 168.0 KiB 27%
Fonts 97.1 KiB 16%
CSS 32.7 KiB 5%
HTML 20.0 KiB 3%
Other 1.7 KiB 0%
0 2.4 MB 4.9 MB
Under budget
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
1 fonts (97 KB)
PASS
1 fonts (97 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

97 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 FCP 2.0 s LCP 3.6 shttps://obsidian.md/fonts/Inter-Regular.woff2Inter-Regular.woff2 https://obsidian.md/fonts/Inter-Regular.woff2 — 97.1 KiB — 0 ms — font-display: swap
Inter-Regular.woff2 woff2 swap
Size 97 KB
Load time 0 ms
Start 0 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+
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: Cloudflare

Network Waterfall
16 requests over 0ms
INFO

Performance analysis not available for this result.

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 13065ms · 186KB · L3097/mo
obsidian.md
Other
Costly
Execution 12166ms
Transfer 10 KB
Monthly Cost L2884/mo
obsidian.md
Other
Costly
Execution 382ms
Transfer 20 KB
Monthly Cost L91/mo
Unattributable
Other
Costly
Execution 259ms
Transfer 0 KB
Monthly Cost L61/mo
obsidian.md
Other
Optional
Execution 134ms
Transfer 142 KB
Unused 61%
Monthly Cost L32/mo
obsidian.md
Other
Optional
Execution 124ms
Transfer 14 KB
Monthly Cost L29/mo

These scripts may cost more than they're worth

  • obsidian.md adds 12166ms and costs ~L2884/month
  • obsidian.md adds 382ms and costs ~L91/month
  • Unattributable adds 259ms and costs ~L61/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

obsidian.md takes 12166ms 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

obsidian.md takes 382ms 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

Unattributable takes 259ms 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

61% of obsidian.md'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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