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https://bun.sh

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
66
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
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.
92
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.

537 ms

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

2.31 s

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

493 ms

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

0.014

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

1.16 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.

2.92 s

Page Load Progression

625 ms
1.2 s
1.9 s
2.5 s
3.1 s
3.8 s
4.4 s
5.0 s
Checks
14
7 PASS 2 REVIEW 3 FIX
F
Page Weight Budget
Action
3.2 MB transferred, 52 requests
FIX
3.2 MB transferred, 52 requests
Warning::
Page weighs 7.9 MB (3.2 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
52 HTTP requests
Info::
Estimated 0.66 g CO2 per page load
3.2 MB / 2.4 MB budget
3.2 MB transferred
52 requests
0.66 g CO2 per page load
JavaScript 1.5 MiB 47%
Images 866.5 KiB 27%
Other 769.3 KiB 24%
HTML 60.4 KiB 2%
Other 7.0 KiB 0%
Other 5.2 KiB 0%
CSS 4.0 KiB 0%
Other 2.5 KiB 0%
Other 1.0 KiB 0%
Other 868 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

D
JS Execution Cost
Action
2904ms total JS execution
FIX
2904ms total JS execution
Warning::
https://bun.sh/inkeep.min.js: 1258ms CPU time
Warning::
https://bun.sh/: 1156ms CPU time
Warning::
Unattributable: 305ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 101ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-4B43...: 84ms CPU time
Info::
Third-party scripts: 490ms (17% of total)

Main Thread Breakdown

Script Evaluation 44% Style & Layout 23% Other 22% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://bun.sh/inkeep.min.js1258ms859ms8ms1st
https://bun.sh/1156ms169ms8ms1st
Unattributable305ms9ms0ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js101ms85ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4B43HPM4TV84ms70ms13ms3rd
F
JS Bundles
Action
7 scripts, 452 KB unused
FIX
7 scripts, 452 KB unused
Warning::
https://bun.sh/inkeep.min.js: 358 KB unused (28%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://bun.sh/inkeep.min.js: unminified — 421 KB could be saved
Warning::
https://www.googletagmanager.com/gtag/js?id=G-4B43...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.jsdelivr.net/npm/@docsearch/js@3: 30 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 452 KB
452 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://bun.sh/inkeep.min.js1290 KB358 KB (28%)✗1st
https://www.googletagmanager.com/gtag/js?id=G-4B43HPM4TV157 KB65 KB (41%)✓3rd
https://cdn.jsdelivr.net/npm/@docsearch/js@336 KB30 KB (83%)✓3rd
https://plausible.io/js/script.js2 KB—✓3rd
https://www.clarity.ms/tag/tnqnxgzonz1 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://scripts.clarity.ms/0.8.59/clarity.js26 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

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

C
Image Optimization
Action
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://bun.sh/images/logo-bar.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bun.sh/logos/lovable.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bun.sh/logo_avatar.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bun.sh/logos/coderabbit.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bun.sh/logos/replit-wordmark.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://bun.sh/logos/cursor.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 867 KB
0 oversized -0 KB
14 legacy format
6 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

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

B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
Last-Modified header present
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
8% third-party, 0 ms blocking
PASS
8% third-party, 0 ms blocking
Info::
Third-party code accounts for 8% of page weight (245.2 KiB of 3.2 MiB)
Info::
Third-party blocking time is low (0 ms)
92%
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
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+
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
52 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
17% of JavaScript execution is third-party
First-party Third-party 490ms · 183KB · $8/mo
Unattributable
Other
Costly
Execution 305ms
Transfer 0 KB
Monthly Cost $5/mo
Microsoft Clarity
Session Replay
Optional
Execution 101ms
Transfer 26 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 84ms
Transfer 157 KB
Unused 41%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 305ms and costs ~$5/month

Unattributable takes 305ms 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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