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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
3
PASS
9
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.
82
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.
85
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.

2.45 s

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

6.20 s

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

110 ms

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

0.238

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

5.87 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.

13.61 s

Page Load Progression

521 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.6 s
4.2 s
Checks
17
9 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
4.6 MB transferred, 67 requests
FIX
4.6 MB transferred, 67 requests
Critical::
Page weighs 5.2 MB (4.6 MB transferred)
Warning::
Images are 3.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.4 MB
Info::
67 HTTP requests
Info::
Estimated 0.96 g CO2 per page load
4.6 MB / 2.4 MB budget
4.6 MB transferred
67 requests
0.96 g CO2 per page load
Images 3.4 MiB 75%
Other 770.1 KiB 16%
JavaScript 195.1 KiB 4%
Fonts 156.1 KiB 3%
HTML 32.4 KiB 1%
CSS 22.9 KiB 0%
Other 4.6 KiB 0%
Other 2.9 KiB 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
JS Execution Cost
Action
3208ms total JS execution
FIX
3208ms total JS execution
Warning::
https://hackmd.io/: 1848ms CPU time
Warning::
https://hackmd.io/_next/static/chunks/bf9c1cba9711...: 823ms CPU time
Warning::
Unattributable: 537ms CPU time
Info::
Third-party scripts: 537ms (17% of total)

Main Thread Breakdown

Other 41% Script Evaluation 25% Style & Layout 16% Rendering 14%
ScriptTotalScriptingParse/CompileParty
https://hackmd.io/1848ms11ms21ms1st
https://hackmd.io/_next/static/chunks/bf9c1cba9711df19.js823ms745ms17ms1st
Unattributable537ms13ms0ms3rd
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, no-cache, no-store, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, no-cache, no-store, max-age=0, must-revalidate

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
B
Image Optimization
38 images, 0 KB saveable
REVIEW
38 images, 0 KB saveable
Info::
All images are well-optimized
38 images 3.4 MB
0 oversized -0 KB
38 legacy format
0 missing dimensions CLS risk
C
Page Weight Inventory
Action
67 resources · 4.6 MB · 25 KB savings available
REVIEW
67 resources · 4.6 MB · 25 KB savings available
Warning::
Page weight 3.6 MB over 1MB target
Got: 4.6 MB Expected: ≤ 1 MB
Info::
2 third-party resources (0% of weight)
Info::
9 resources over 200KB
67 resources · 4.6 MiB · 2 third-party 3.6 MiB over 1MB target
Image 75% · 3.4 MiB
Media 16% · 770.1 KiB
JavaScript 4% · 195.1 KiB
Font 3% · 156.1 KiB
Document 1% · 32.4 KiB
CSS 0% · 22.9 KiB
Other 0% · 4.6 KiB

~24.9 KiB of savings available

Remove unused JavaScript: 24.9 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (2.4 KiB of 4.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
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+
Font Loading
5 fonts (156 KB)
PASS
5 fonts (156 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

156 KB total

Render-blocking

0

of 5

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 6.0 s FCP 2.5 s LCP 6.2 shttps://hackmd.io/_next/static/media/2f13ad8e538108e0-s.p.9b936cf7.woff22f13ad8e538108e0-s.p.9b... https://hackmd.io/_next/static/media/2f13ad8e538108e0-s.p.9b936cf7.woff2 — 32.6 KiB — 1.1 s — font-display: swaphttps://hackmd.io/_next/static/media/83afe278b6a6bb3c-s.p.3a6ba036.woff283afe278b6a6bb3c-s.p.3a... https://hackmd.io/_next/static/media/83afe278b6a6bb3c-s.p.3a6ba036.woff2 — 47.9 KiB — 1.1 s — font-display: swaphttps://hackmd.io/_next/static/media/890431f0a0104557-s.p.2aa14085.woff2890431f0a0104557-s.p.2a... https://hackmd.io/_next/static/media/890431f0a0104557-s.p.2aa14085.woff2 — 31.2 KiB — 874 ms — font-display: swaphttps://hackmd.io/_next/static/media/948603995becd211-s.p.15946141.woff2948603995becd211-s.p.15... https://hackmd.io/_next/static/media/948603995becd211-s.p.15946141.woff2 — 9.2 KiB — 873 ms — font-display: swaphttps://hackmd.io/_next/static/media/e8f2fbee2754df70-s.p.9b7a96b4.woff2e8f2fbee2754df70-s.p.9b... https://hackmd.io/_next/static/media/e8f2fbee2754df70-s.p.9b7a96b4.woff2 — 35.2 KiB — 441 ms — font-display: swap
2f13ad8e538108e0-s.p.9b... woff2 swap
Size 33 KB
Load time 1.1 s
Start 747 ms
Risk FOUT — text flashes from fallback to web font
83afe278b6a6bb3c-s.p.3a... woff2 swap
Size 48 KB
Load time 1.1 s
Start 747 ms
Risk FOUT — text flashes from fallback to web font
890431f0a0104557-s.p.2a... woff2 swap
Size 31 KB
Load time 874 ms
Start 747 ms
Risk FOUT — text flashes from fallback to web font
948603995becd211-s.p.15... woff2 swap
Size 9 KB
Load time 873 ms
Start 748 ms
Risk FOUT — text flashes from fallback to web font
e8f2fbee2754df70-s.p.9b... woff2 swap
Size 35 KB
Load time 441 ms
Start 748 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+
JS Bundles
13 scripts, 25 KB unused
PASS
13 scripts, 25 KB unused
Warning::
https://hackmd.io/_next/static/chunks/bf9c1cba9711...: 25 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 25 KB
25 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://hackmd.io/_next/static/chunks/bf9c1cba9711df19.js66 KB25 KB (38%)✓1st
https://hackmd.io/_next/static/chunks/b53512c697a241ee.js7 KB—✓1st
https://hackmd.io/_next/static/chunks/352249a356f41352.js22 KB—✓1st
https://hackmd.io/_next/static/chunks/90dc6678905ee329.js23 KB—✓1st
https://hackmd.io/_next/static/chunks/turbopack-33cea5077725590e.js4 KB—✓1st
https://hackmd.io/_next/static/chunks/5f61266cc010ad33.js1 KB—✓1st
https://hackmd.io/_next/static/chunks/d5c79332a1584318.js7 KB—✓1st
https://hackmd.io/_next/static/chunks/79164d74d07c8aa2.js14 KB—✓1st
https://hackmd.io/_next/static/chunks/be1d781b53904caa.js15 KB—✓1st
https://hackmd.io/_next/static/chunks/c16b3dec3847a615.js8 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

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
27 hints, 0 missing preconnects
PASS
27 hints, 0 missing preconnects
Info::
Page uses 27 resource hint(s)

Current Resource Hints

preconnect
—
preload
+17
27
dns-prefetch
—
prefetch
—

27 resource hints configured

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
67 requests over 3027ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.5 s LCP 6.2 shttps://hackmd.io// https://hackmd.io/ — 200 — 32.4 KiB — 964 ms — h2https://hackmd.io/_next/static/media/2f13ad8e538108e0-s.p.9b936cf7.woff2/_next/static/media/2f13ad8e538108e... https://hackmd.io/_next/static/media/2f13ad8e538108e0-s.p.9b936cf7.woff2 — 200 — 32.6 KiB — 1.1 s — h2https://hackmd.io/_next/static/media/83afe278b6a6bb3c-s.p.3a6ba036.woff2/_next/static/media/83afe278b6a6bb3... https://hackmd.io/_next/static/media/83afe278b6a6bb3c-s.p.3a6ba036.woff2 — 200 — 47.9 KiB — 1.1 s — h2https://hackmd.io/_next/static/media/890431f0a0104557-s.p.2aa14085.woff2/_next/static/media/890431f0a010455... https://hackmd.io/_next/static/media/890431f0a0104557-s.p.2aa14085.woff2 — 200 — 31.2 KiB — 874 ms — h2https://hackmd.io/_next/static/media/948603995becd211-s.p.15946141.woff2/_next/static/media/948603995becd21... https://hackmd.io/_next/static/media/948603995becd211-s.p.15946141.woff2 — 200 — 9.2 KiB — 873 ms — h2https://hackmd.io/_next/static/media/e8f2fbee2754df70-s.p.9b7a96b4.woff2/_next/static/media/e8f2fbee2754df7... https://hackmd.io/_next/static/media/e8f2fbee2754df70-s.p.9b7a96b4.woff2 — 200 — 35.2 KiB — 441 ms — h2https://hackmd.io/_next/static/chunks/a4d44b71c308de05.css/_next/static/chunks/a4d44b71c308de... https://hackmd.io/_next/static/chunks/a4d44b71c308de05.css — 200 — 16.1 KiB — 830 ms — h2https://hackmd.io/_next/static/chunks/ab94802ba5ab4af4.css/_next/static/chunks/ab94802ba5ab4a... https://hackmd.io/_next/static/chunks/ab94802ba5ab4af4.css — 200 — 6.0 KiB — 830 ms — h2https://hackmd.io/_next/static/chunks/786710bc80ba0dc8.css/_next/static/chunks/786710bc80ba0d... https://hackmd.io/_next/static/chunks/786710bc80ba0dc8.css — 200 — 747 B — 420 ms — h2https://hackmd.io/feature-slides/template-1.png/feature-slides/template-1.png https://hackmd.io/feature-slides/template-1.png — 200 — 439.0 KiB — 1.4 s — h2https://hackmd.io/feature-slides/template-2.png/feature-slides/template-2.png https://hackmd.io/feature-slides/template-2.png — 200 — 294.0 KiB — 1.6 s — h2https://hackmd.io/feature-slides/template-3.png/feature-slides/template-3.png https://hackmd.io/feature-slides/template-3.png — 200 — 274.8 KiB — 1.5 s — h2https://hackmd.io/feature-slides/book.jpeg/feature-slides/book.jpeg https://hackmd.io/feature-slides/book.jpeg — 200 — 997.6 KiB — 1.6 s — h2https://hackmd.io/feature-slides/github-sync.jpeg/feature-slides/github-sync.jpeg https://hackmd.io/feature-slides/github-sync.jpeg — 200 — 543.6 KiB — 1.4 s — h2https://hackmd.io/feature-slides/uml-3.png/feature-slides/uml-3.png https://hackmd.io/feature-slides/uml-3.png — 200 — 65.6 KiB — 1.3 s — h2https://hackmd.io/feature-slides/uml-2.png/feature-slides/uml-2.png https://hackmd.io/feature-slides/uml-2.png — 200 — 112.1 KiB — 1.4 s — h2https://hackmd.io/feature-slides/uml-1.png/feature-slides/uml-1.png https://hackmd.io/feature-slides/uml-1.png — 200 — 92.5 KiB — 1.3 s — h2https://hackmd.io/feature-slides/profile.jpeg/feature-slides/profile.jpeg https://hackmd.io/feature-slides/profile.jpeg — 200 — 224.8 KiB — 1.6 s — h2https://hackmd.io/logos/Arweave%20logomark.png/logos/Arweave%20logomark.png https://hackmd.io/logos/Arweave%20logomark.png — 200 — 9.0 KiB — 1.1 s — h2https://hackmd.io/logos/Avalanche_Horizontal_White.png/logos/Avalanche_Horizontal_White.p... https://hackmd.io/logos/Avalanche_Horizontal_White.png — 200 — 7.5 KiB — 1.1 s — h2https://hackmd.io/logos/Base_Wordmark_White.png/logos/Base_Wordmark_White.png https://hackmd.io/logos/Base_Wordmark_White.png — 200 — 5.9 KiB — 1.2 s — h2https://hackmd.io/logos/Blockfuse_L2.png/logos/Blockfuse_L2.png https://hackmd.io/logos/Blockfuse_L2.png — 200 — 270.5 KiB — 1.6 s — h2https://hackmd.io/logos/Bokeh%20Logo%20Inverted.png/logos/Bokeh%20Logo%20Inverted.png https://hackmd.io/logos/Bokeh%20Logo%20Inverted.png — 200 — 6.6 KiB — 1.2 s — h2https://hackmd.io/logos/Brown.png/logos/Brown.png https://hackmd.io/logos/Brown.png — 200 — 14.5 KiB — 1.2 s — h2https://hackmd.io/logos/ContinuousFoundation_logo.png/logos/ContinuousFoundation_logo.pn... https://hackmd.io/logos/ContinuousFoundation_logo.png — 200 — 6.5 KiB — 1.2 s — h2https://hackmd.io/logos/DevOpsDays.png/logos/DevOpsDays.png https://hackmd.io/logos/DevOpsDays.png — 200 — 9.5 KiB — 1.2 s — h2https://hackmd.io/logos/ETH.png/logos/ETH.png https://hackmd.io/logos/ETH.png — 200 — 5.2 KiB — 1.2 s — h2https://hackmd.io/logos/brightid.svg/logos/brightid.svg https://hackmd.io/logos/brightid.svg — 200 — 4.4 KiB — 1.2 s — h2https://hackmd.io/_next/static/chunks/d5c79332a1584318.js/_next/static/chunks/d5c79332a15843... https://hackmd.io/_next/static/chunks/d5c79332a1584318.js — 200 — 7.0 KiB — 1.2 s — h2https://hackmd.io/_next/static/chunks/352249a356f41352.js/_next/static/chunks/352249a356f413... https://hackmd.io/_next/static/chunks/352249a356f41352.js — 200 — 21.8 KiB — 1.2 s — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 2.5 s LCP 6.2 shttps://hackmd.io// https://hackmd.io/ — 200 — 32.4 KiB — 964 ms — h2https://hackmd.io/_next/static/media/2f13ad8e538108e0-s.p.9b936cf7.woff2/_next/static/media/2f13ad8e538108e... https://hackmd.io/_next/static/media/2f13ad8e538108e0-s.p.9b936cf7.woff2 — 200 — 32.6 KiB — 1.1 s — h2https://hackmd.io/_next/static/media/83afe278b6a6bb3c-s.p.3a6ba036.woff2/_next/static/media/83afe278b6a6bb3... https://hackmd.io/_next/static/media/83afe278b6a6bb3c-s.p.3a6ba036.woff2 — 200 — 47.9 KiB — 1.1 s — h2https://hackmd.io/_next/static/media/890431f0a0104557-s.p.2aa14085.woff2/_next/static/media/890431f0a010455... https://hackmd.io/_next/static/media/890431f0a0104557-s.p.2aa14085.woff2 — 200 — 31.2 KiB — 874 ms — h2https://hackmd.io/_next/static/media/948603995becd211-s.p.15946141.woff2/_next/static/media/948603995becd21... https://hackmd.io/_next/static/media/948603995becd211-s.p.15946141.woff2 — 200 — 9.2 KiB — 873 ms — h2https://hackmd.io/_next/static/media/e8f2fbee2754df70-s.p.9b7a96b4.woff2/_next/static/media/e8f2fbee2754df7... https://hackmd.io/_next/static/media/e8f2fbee2754df70-s.p.9b7a96b4.woff2 — 200 — 35.2 KiB — 441 ms — h2https://hackmd.io/_next/static/chunks/a4d44b71c308de05.css/_next/static/chunks/a4d44b71c308de... https://hackmd.io/_next/static/chunks/a4d44b71c308de05.css — 200 — 16.1 KiB — 830 ms — h2https://hackmd.io/_next/static/chunks/ab94802ba5ab4af4.css/_next/static/chunks/ab94802ba5ab4a... https://hackmd.io/_next/static/chunks/ab94802ba5ab4af4.css — 200 — 6.0 KiB — 830 ms — h2https://hackmd.io/_next/static/chunks/786710bc80ba0dc8.css/_next/static/chunks/786710bc80ba0d... https://hackmd.io/_next/static/chunks/786710bc80ba0dc8.css — 200 — 747 B — 420 ms — h2https://hackmd.io/feature-slides/template-1.png/feature-slides/template-1.png https://hackmd.io/feature-slides/template-1.png — 200 — 439.0 KiB — 1.4 s — h2https://hackmd.io/feature-slides/template-2.png/feature-slides/template-2.png https://hackmd.io/feature-slides/template-2.png — 200 — 294.0 KiB — 1.6 s — h2https://hackmd.io/feature-slides/template-3.png/feature-slides/template-3.png https://hackmd.io/feature-slides/template-3.png — 200 — 274.8 KiB — 1.5 s — h2https://hackmd.io/feature-slides/book.jpeg/feature-slides/book.jpeg https://hackmd.io/feature-slides/book.jpeg — 200 — 997.6 KiB — 1.6 s — h2https://hackmd.io/feature-slides/github-sync.jpeg/feature-slides/github-sync.jpeg https://hackmd.io/feature-slides/github-sync.jpeg — 200 — 543.6 KiB — 1.4 s — h2https://hackmd.io/feature-slides/uml-3.png/feature-slides/uml-3.png https://hackmd.io/feature-slides/uml-3.png — 200 — 65.6 KiB — 1.3 s — h2https://hackmd.io/feature-slides/uml-2.png/feature-slides/uml-2.png https://hackmd.io/feature-slides/uml-2.png — 200 — 112.1 KiB — 1.4 s — h2https://hackmd.io/feature-slides/uml-1.png/feature-slides/uml-1.png 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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
17% of JavaScript execution is third-party
First-party Third-party 537ms · 0KB · €7/mo
Unattributable
Other
Costly
Execution 537ms
Transfer 0 KB
Monthly Cost €7/mo

These scripts may cost more than they're worth

  • Unattributable adds 537ms and costs ~€7/month

Unattributable takes 537ms 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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