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https://www.logseq.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
57
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

3.88 s

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

6.78 s

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

416 ms

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.

3.88 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.

6.78 s

Page Load Progression

504 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
16
7 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 25 requests
FIX
2.4 MB transferred, 25 requests
Warning::
Page weighs 4.3 MB (2.4 MB transferred)
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Info::
25 HTTP requests
Info::
Estimated 0.51 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
25 requests
0.51 g CO2 per page load
Images 2.0 MiB 81%
JavaScript 395.0 KiB 16%
Other 62.2 KiB 2%
CSS 18.0 KiB 1%
Other 6.5 KiB 0%
HTML 914 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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 (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4377ms total JS execution
FIX
4377ms total JS execution
Warning::
https://logseq.com/: 1871ms CPU time
Warning::
https://logseq.com/index.4a951e2d.js: 1718ms CPU time
Warning::
Unattributable: 787ms CPU time
Warning::
Third-party scripts: 4377ms (100% of total)

Main Thread Breakdown

Other 52% Script Evaluation 24% Style & Layout 14% Rendering 9%
ScriptTotalScriptingParse/CompileParty
https://logseq.com/1871ms15ms0ms3rd
https://logseq.com/index.4a951e2d.js1718ms1006ms4ms3rd
Unattributable787ms12ms0ms3rd
D
JS Bundles
Action
3 scripts, 156 KB unused
FIX
3 scripts, 156 KB unused
Warning::
https://logseq.com/index.4a951e2d.js: 156 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://logseq.com/index.4a951e2d.js: unminified — 69 KB could be saved
Info::
Total unused JavaScript: 156 KB
156 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://logseq.com/index.4a951e2d.js392 KB156 KB (40%)✗3rd
https://logseq.com/index.5cad6fbd.js2 KB—✓3rd
https://assets.lemonsqueezy.com/lemon.js2 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

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
Image Optimization
Action
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Warning::
https://logseq.com/logo-with-border.a30e7bd0.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://logseq.com/benefit-0.94936967.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://logseq.com/promise-0-0.9e77bf1b.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://logseq.com/product_hunt_logo.55e01c43.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://logseq.com/full-bg-text_mobile.8b57c51e.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
16 images 2.0 MB
0 oversized -0 KB
16 legacy format
5 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

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

Green Hosting

No green hosting detected

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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
Network Waterfall
25 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 4377ms · 393KB · €48/mo
logseq.com
Other
Costly
Execution 1871ms
Transfer 1 KB
Monthly Cost €20/mo
logseq.com
Other
Costly
Execution 1718ms
Transfer 392 KB
Unused 40%
Monthly Cost €19/mo
Unattributable
Other
Costly
Execution 787ms
Transfer 0 KB
Monthly Cost €9/mo

These scripts may cost more than they're worth

  • logseq.com adds 1871ms and costs ~€20/month
  • logseq.com adds 1718ms and costs ~€19/month
  • Unattributable adds 787ms and costs ~€9/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

logseq.com takes 1871ms 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

logseq.com takes 1718ms 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 787ms 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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