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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
47
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.
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.

2.90 s

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

6.07 s

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

1.50 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.

3.33 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.

19.77 s

Page Load Progression

538 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.8 s
4.3 s
Checks
16
7 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 99 requests
FIX
3.4 MB transferred, 99 requests
Warning::
Page weighs 8.4 MB (3.4 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
99 HTTP requests
Info::
Estimated 0.72 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
99 requests
0.72 g CO2 per page load
Other 1.5 MiB 44%
JavaScript 1.2 MiB 34%
Images 499.5 KiB 14%
Fonts 138.8 KiB 4%
HTML 78.3 KiB 2%
CSS 66.7 KiB 2%
Other 866 B 0%
Other 467 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
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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7575ms total JS execution
FIX
7575ms total JS execution
Warning::
https://neon.com/_next/static/chunks/14pofykpskj6v...: 2695ms CPU time
Warning::
https://neon.com/: 2379ms CPU time
Warning::
https://neon.com/_next/static/chunks/15lxb7jjl82fj...: 1223ms CPU time
Warning::
Unattributable: 659ms CPU time
Info::
https://neon.com/_next/static/chunks/0g~lkn047k.tl...: 143ms CPU time
Warning::
Third-party scripts: 7575ms (100% of total)

Main Thread Breakdown

Script Evaluation 37% Other 25% Style & Layout 21% Rendering 8% Script Parsing & Compilation 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://neon.com/_next/static/chunks/14pofykpskj6v.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj462695ms2081ms17ms3rd
https://neon.com/2379ms143ms45ms3rd
https://neon.com/_next/static/chunks/15lxb7jjl82fj.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj461223ms166ms6ms3rd
Unattributable659ms168ms0ms3rd
https://neon.com/_next/static/chunks/0g~lkn047k.tl.css?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46143ms0ms0ms3rd
https://neon.com/_next/static/chunks/0yfh7_u68d5.q.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46133ms94ms8ms3rd
https://neon.com/_next/static/chunks/0-wyrs755k4-p.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46131ms117ms10ms3rd
https://neon.com/_next/static/chunks/18capnr.er6lu.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4680ms1ms78ms3rd
https://neon.com/_next/static/chunks/0fi9lix4fz.yg.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4680ms76ms3ms3rd
https://neon.com/_next/static/chunks/0fo60y7ohavwr.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4653ms1ms52ms3rd
F
JS Bundles
Action
42 scripts, 730 KB unused
FIX
42 scripts, 730 KB unused
Warning::
https://neon.com/_next/static/chunks/0fo60y7ohavwr...: 239 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://neon.com/_next/static/chunks/18capnr.er6lu...: 238 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://neon.com/_next/static/chunks/0vih00lfusn-f...: 35 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://neon.com/_next/static/chunks/12z.16dpsg_42...: 35 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://neon.com/_next/static/chunks/0l7tg8r6xuc29...: 29 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 730 KB
730 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://neon.com/_next/static/chunks/0fo60y7ohavwr.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46240 KB239 KB (100%)✓3rd
https://neon.com/_next/static/chunks/18capnr.er6lu.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46239 KB238 KB (100%)✓3rd
https://neon.com/_next/static/chunks/0vih00lfusn-f.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4636 KB35 KB (99%)✓3rd
https://neon.com/_next/static/chunks/12z.16dpsg_42.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4636 KB35 KB (99%)✓3rd
https://neon.com/_next/static/chunks/0l7tg8r6xuc29.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4630 KB29 KB (100%)✓3rd
https://neon.com/_next/static/chunks/0vvlj5zzpjfyu.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4630 KB29 KB (100%)✓3rd
https://neon.com/_next/static/chunks/12ctv16-prg-8.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4629 KB29 KB (100%)✓3rd
https://neon.com/_next/static/chunks/08rokcdozfqe8.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4627 KB27 KB (99%)✓3rd
https://neon.com/_next/static/chunks/0-65m4coapv97.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4623 KB23 KB (100%)✓3rd
https://neon.com/_next/static/chunks/14pofykpskj6v.js?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4671 KB23 KB (33%)✓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

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

B
Image Optimization
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Info::
All images are well-optimized
30 images 500 KB
0 oversized -0 KB
23 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
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+
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
4 fonts (206 KB)
PASS
4 fonts (206 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

206 KB total

Render-blocking

0

of 4

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 2.9 s LCP 6.1 shttps://neon.com/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj4683afe278b6a6bb3c-s.p.0q... https://neon.com/_next/static/media/83afe278b6a6bb3c-s.p.0q-301v4kxxnr.woff2?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46 — 47.5 KiB — 0 ms — font-display: swaphttps://neon.com/_next/static/media/ESBuild_Medium-s.p.0_8qmtq5otlu1.woff2?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46ESBuild_Medium-s.p.0_8q... https://neon.com/_next/static/media/ESBuild_Medium-s.p.0_8qmtq5otlu1.woff2?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46 — 34.3 KiB — 0 ms — font-display: swaphttps://neon.com/_next/static/media/GeistMono_Variable.p.05wdprr-k~q7o.woff2?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46GeistMono_Variable.p.05... https://neon.com/_next/static/media/GeistMono_Variable.p.05wdprr-k~q7o.woff2?dpl=dpl_5cMpj5nAJ9JL9mMRdmLL7VSEmj46 — 57.0 KiB — 0 ms — font-display: swaphttps://neon.com/fonts/geist-mono/GeistMono-Regular.ttfGeistMono-Regular.ttf https://neon.com/fonts/geist-mono/GeistMono-Regular.ttf — 66.7 KiB — 0 ms — font-display: swap
83afe278b6a6bb3c-s.p.0q... woff2 swap
Size 48 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ESBuild_Medium-s.p.0_8q... woff2 swap
Size 34 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GeistMono_Variable.p.05... woff2 swap
Size 57 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GeistMono-Regular.ttf ttf swap
Size 67 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~20 KB and ~40 ms

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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
1
preload
5
dns-prefetch
—
prefetch
—

6 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
99 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 7575ms · 821KB · €82/mo
neon.com
Other
Costly
Execution 2695ms
Transfer 71 KB
Unused 33%
Monthly Cost €29/mo
neon.com
Other
Costly
Execution 2379ms
Transfer 78 KB
Monthly Cost €26/mo
neon.com
Other
Costly
Execution 1223ms
Transfer 36 KB
Monthly Cost €13/mo
Unattributable
Other
Costly
Execution 659ms
Transfer 0 KB
Monthly Cost €7/mo
neon.com
Other
Optional
Execution 143ms
Transfer 64 KB
Monthly Cost €2/mo
neon.com
Other
Optional
Execution 133ms
Transfer 38 KB
Monthly Cost €1/mo
neon.com
Other
Optional
Execution 131ms
Transfer 44 KB
Monthly Cost €1/mo
neon.com
Other
Optional
Execution 80ms
Transfer 239 KB
Unused 100%
Monthly Cost €1/mo
neon.com
Other
Optional
Execution 80ms
Transfer 11 KB
Monthly Cost €1/mo
neon.com
Other
Optional
Execution 53ms
Transfer 240 KB
Unused 100%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • neon.com adds 2695ms and costs ~€29/month
  • neon.com adds 2379ms and costs ~€26/month
  • neon.com adds 1223ms and costs ~€13/month
  • Unattributable adds 659ms and costs ~€7/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

neon.com takes 2695ms 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

neon.com takes 2379ms 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

neon.com takes 1223ms 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 659ms 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

100% of neon.com'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

100% of neon.com'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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