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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
71
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.

1.65 s

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

2.70 s

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

0 ms

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

0.097

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

2.74 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.

2.72 s

Page Load Progression

820 ms
1.6 s
2.5 s
3.3 s
4.1 s
4.9 s
5.7 s
6.6 s
Checks
15
7 PASS 4 REVIEW 2 FIX
F
Page Weight Budget
Action
5.1 MB transferred, 87 requests
FIX
5.1 MB transferred, 87 requests
Critical::
Page weighs 5.7 MB (5.1 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::
87 HTTP requests
Info::
Estimated 1.1 g CO2 per page load
5.1 MB / 2.4 MB budget
5.1 MB transferred
87 requests
1.1 g CO2 per page load
Images 3.4 MiB 68%
Other 1.2 MiB 23%
JavaScript 195.2 KiB 4%
Fonts 156.1 KiB 3%
Other 45.9 KiB 1%
HTML 32.4 KiB 1%
CSS 22.9 KiB 0%
Other 3.0 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
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
B
JS Execution Cost
953ms total JS execution
REVIEW
953ms total JS execution
Warning::
https://hackmd.io/: 617ms CPU time
Info::
https://hackmd.io/_next/static/chunks/bf9c1cba9711...: 174ms CPU time
Info::
Unattributable: 162ms CPU time
Info::
Third-party scripts: 162ms (17% of total)

Main Thread Breakdown

Other 44% Script Evaluation 19% Style & Layout 18% Rendering 15%
ScriptTotalScriptingParse/CompileParty
https://hackmd.io/617ms2ms3ms1st
https://hackmd.io/_next/static/chunks/bf9c1cba9711df19.js174ms151ms5ms1st
Unattributable162ms10ms0ms3rd
C
Page Weight Inventory
Action
87 resources · 5.1 MB · 25 KB savings available
REVIEW
87 resources · 5.1 MB · 25 KB savings available
Warning::
Page weight 4.1 MB over 1MB target
Got: 5.1 MB Expected: ≤ 1 MB
Info::
2 third-party resources (0% of weight)
Info::
9 resources over 200KB
87 resources · 5.1 MiB · 2 third-party 4.1 MiB over 1MB target
Image 68% · 3.4 MiB
Media 23% · 1.2 MiB
JavaScript 4% · 195.2 KiB
Font 3% · 156.1 KiB
Document 1% · 51.4 KiB
Other 1% · 26.9 KiB
CSS 0% · 22.9 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 5.1 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.7 s LCP 2.7 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 — 890 ms — 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 — 890 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 — 889 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 890 ms
Start 756 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 756 ms
Risk FOUT — text flashes from fallback to web font
890431f0a0104557-s.p.2a... woff2 swap
Size 31 KB
Load time 890 ms
Start 756 ms
Risk FOUT — text flashes from fallback to web font
948603995becd211-s.p.15... woff2 swap
Size 9 KB
Load time 889 ms
Start 757 ms
Risk FOUT — text flashes from fallback to web font
e8f2fbee2754df70-s.p.9b... woff2 swap
Size 35 KB
Load time 441 ms
Start 757 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
87 requests over 4434ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.7 s LCP 2.7 shttps://hackmd.io// https://hackmd.io/ — 200 — 32.4 KiB — 972 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 — 890 ms — 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 — 890 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 — 889 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 — 824 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 — 823 ms — h2https://hackmd.io/_next/static/chunks/786710bc80ba0dc8.css/_next/static/chunks/786710bc80ba0d... https://hackmd.io/_next/static/chunks/786710bc80ba0dc8.css — 200 — 751 B — 441 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 — 1.8 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 — 1.8 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 — 1.8 s — h2https://hackmd.io/feature-slides/book.jpeg/feature-slides/book.jpeg https://hackmd.io/feature-slides/book.jpeg — 200 — 997.5 KiB — 1.8 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 — 1.7 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 — 1.5 s — h2https://hackmd.io/feature-slides/uml-2.png/feature-slides/uml-2.png https://hackmd.io/feature-slides/uml-2.png — 200 — 112.2 KiB — 1.6 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 — 1.5 s — h2https://hackmd.io/feature-slides/profile.jpeg/feature-slides/profile.jpeg https://hackmd.io/feature-slides/profile.jpeg — 200 — 224.7 KiB — 1.5 s — h2https://hackmd.io/logos/Arweave%20logomark.png/logos/Arweave%20logomark.png https://hackmd.io/logos/Arweave%20logomark.png — 200 — 9.0 KiB — 1.3 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 — 1.3 s — h2https://hackmd.io/logos/Base_Wordmark_White.png/logos/Base_Wordmark_White.png https://hackmd.io/logos/Base_Wordmark_White.png — 200 — 6.0 KiB — 1.3 s — h2https://hackmd.io/logos/Blockfuse_L2.png/logos/Blockfuse_L2.png https://hackmd.io/logos/Blockfuse_L2.png — 200 — 270.5 KiB — 1.8 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 — 1.3 s — h2https://hackmd.io/logos/Brown.png/logos/Brown.png https://hackmd.io/logos/Brown.png — 200 — 14.5 KiB — 1.3 s — h2https://hackmd.io/logos/ContinuousFoundation_logo.png/logos/ContinuousFoundation_logo.pn... https://hackmd.io/logos/ContinuousFoundation_logo.png — 200 — 6.5 KiB — 1.3 s — h2https://hackmd.io/logos/DevOpsDays.png/logos/DevOpsDays.png https://hackmd.io/logos/DevOpsDays.png — 200 — 9.5 KiB — 1.3 s — h2https://hackmd.io/logos/ETH.png/logos/ETH.png https://hackmd.io/logos/ETH.png — 200 — 5.2 KiB — 1.3 s — h2https://hackmd.io/logos/brightid.svg/logos/brightid.svg https://hackmd.io/logos/brightid.svg — 200 — 4.4 KiB — 1.3 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 — 1.3 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 — 1.3 s — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.7 s LCP 2.7 shttps://hackmd.io// https://hackmd.io/ — 200 — 32.4 KiB — 972 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 — 890 ms — 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 — 890 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 — 889 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 — 824 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 — 823 ms — h2https://hackmd.io/_next/static/chunks/786710bc80ba0dc8.css/_next/static/chunks/786710bc80ba0d... https://hackmd.io/_next/static/chunks/786710bc80ba0dc8.css — 200 — 751 B — 441 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 — 1.8 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 — 1.8 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 — 1.8 s — h2https://hackmd.io/feature-slides/book.jpeg/feature-slides/book.jpeg https://hackmd.io/feature-slides/book.jpeg — 200 — 997.5 KiB — 1.8 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 — 1.7 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 — 1.5 s — h2https://hackmd.io/feature-slides/uml-2.png/feature-slides/uml-2.png https://hackmd.io/feature-slides/uml-2.png — 200 — 112.2 KiB — 1.6 s — h2https://hackmd.io/feature-slides/uml-1.png/feature-slides/uml-1.png 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— h2https://hackmd.io/logos/Brown.png/logos/Brown.png https://hackmd.io/logos/Brown.png — 200 — 14.5 KiB — 1.3 s — h2https://hackmd.io/logos/ContinuousFoundation_logo.png/logos/ContinuousFoundation_logo.pn... https://hackmd.io/logos/ContinuousFoundation_logo.png — 200 — 6.5 KiB — 1.3 s — h2https://hackmd.io/logos/DevOpsDays.png/logos/DevOpsDays.png https://hackmd.io/logos/DevOpsDays.png — 200 — 9.5 KiB — 1.3 s — h2https://hackmd.io/logos/ETH.png/logos/ETH.png https://hackmd.io/logos/ETH.png — 200 — 5.2 KiB — 1.3 s — h2https://hackmd.io/logos/brightid.svg/logos/brightid.svg https://hackmd.io/logos/brightid.svg — 200 — 4.4 KiB — 1.3 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 — 1.3 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 — 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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 162ms · 0KB · €2/mo
Unattributable
Other
Optional
Execution 162ms
Transfer 0 KB
Monthly Cost €2/mo

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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