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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
2
REVIEW
5
PASS
5
INFO
2

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

Mobile Desktop
87
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.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

701 ms

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

2.24 s

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

68 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.

1.38 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.

2.31 s

Page Load Progression

486 ms
972 ms
1.5 s
1.9 s
2.4 s
2.9 s
3.4 s
3.9 s
Checks
14
5 PASS 5 REVIEW 2 FIX
F
Page Weight Budget
Action
13.0 MB transferred, 77 requests
FIX
13.0 MB transferred, 77 requests
Critical::
Page weighs 15.4 MB (13.0 MB transferred)
Warning::
JavaScript is 1000 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1000 KB
Info::
Fonts are 200 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 200 KB
Info::
77 HTTP requests
Info::
Estimated 2.7 g CO2 per page load
13.0 MB / 2.4 MB budget
13.0 MB transferred
77 requests
2.7 g CO2 per page load
Other 11.7 MiB 90%
JavaScript 1000.1 KiB 7%
Fonts 200.3 KiB 2%
Images 83.6 KiB 1%
Other 33.7 KiB 0%
CSS 27.0 KiB 0%
HTML 19.3 KiB 0%
Other 5.1 KiB 0%
Other 1.3 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (13.0 MiB of 13.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
B
Image Optimization
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Info::
All images are well-optimized
16 images 84 KB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1470ms total JS execution
REVIEW
1470ms total JS execution
Warning::
https://ona.com/_next/static/chunks/1684-920f26c8b...: 339ms CPU time
Warning::
https://ona.com/: 250ms CPU time
Info::
https://ona.com/_next/static/chunks/8497-9eef2f9e0...: 185ms CPU time
Info::
Unattributable: 167ms CPU time
Info::
https://ona.com/_next/static/chunks/8787-2a15ff454...: 166ms CPU time
Warning::
Third-party scripts: 1470ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 23% Style & Layout 10% Rendering 7% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://ona.com/_next/static/chunks/1684-920f26c8bc9686e9.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU339ms292ms5ms3rd
https://ona.com/250ms14ms3ms3rd
https://ona.com/_next/static/chunks/8497-9eef2f9e09183f7c.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU185ms164ms12ms3rd
Unattributable167ms13ms0ms3rd
https://ona.com/_next/static/chunks/8787-2a15ff454cd553a8.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU166ms31ms3ms3rd
https://ona.com/_next/static/chunks/a4634e51-1edca49e0237387d.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU117ms63ms11ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P4LP64V78ms68ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-N7BXGH25CC59ms45ms13ms3rd
https://ona.com/_next/static/chunks/5820.7164c20ffb7233ec.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU58ms54ms2ms3rd
https://ona.com/_next/static/chunks/webpack-941b33d7cea6e0f1.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU51ms44ms0ms3rd
C
JS Bundles
Action
32 scripts, 251 KB unused
REVIEW
32 scripts, 251 KB unused
Warning::
https://ona.com/_next/static/chunks/a4634e51-1edca...: 92 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P4L...: 70 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-N7BX...: 68 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ona.com/_next/static/chunks/9394-1ed510068...: 21 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 251 KB
251 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ona.com/_next/static/chunks/a4634e51-1edca49e0237387d.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU154 KB92 KB (60%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P4LP64V157 KB70 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-N7BXGH25CC173 KB68 KB (39%)✓3rd
https://ona.com/_next/static/chunks/9394-1ed5100686ed099a.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU40 KB21 KB (54%)✓3rd
https://ona.com/_next/static/chunks/app/(frontend)/not-found-3d89a22f20804769.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU4 KB—✓3rd
https://ona.com/_next/static/chunks/1684-920f26c8bc9686e9.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU46 KB—✓3rd
https://ona.com/_next/static/chunks/1597-8013c2e071a1fc89.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU6 KB—✓3rd
https://ona.com/_next/static/chunks/main-app-d41d56f775a954bb.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU1 KB—✓3rd
https://ona.com/_next/static/chunks/1194-125a52d80c11f112.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU3 KB—✓3rd
https://ona.com/_next/static/chunks/5589-02e19c08b2d84663.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU4 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

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
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
3 fonts (200 KB)
PASS
3 fonts (200 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

200 KB total

Render-blocking

0

of 3

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 FCP 701 ms LCP 2.2 shttps://ona.com/fonts/ABCDiatype-Regular.woff2ABCDiatype-Regular.woff2 https://ona.com/fonts/ABCDiatype-Regular.woff2 — 69.0 KiB — 0 ms — font-display: swaphttps://ona.com/fonts/Martina-Plantijn-Light.woff2Martina-Plantijn-Light.... https://ona.com/fonts/Martina-Plantijn-Light.woff2 — 55.8 KiB — 0 ms — font-display: swaphttps://ona.com/fonts/ABCDiatype-Bold.woff2ABCDiatype-Bold.woff2 https://ona.com/fonts/ABCDiatype-Bold.woff2 — 75.6 KiB — 0 ms — font-display: swap
ABCDiatype-Regular.woff2 woff2 swap
Size 69 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Martina-Plantijn-Light.... woff2 swap
Size 56 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ABCDiatype-Bold.woff2 woff2 swap
Size 76 KB
Load time 0 ms
Start 0 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+
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
77 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 1470ms · 807KB · €16/mo
ona.com
Other
Costly
Execution 339ms
Transfer 46 KB
Monthly Cost €4/mo
ona.com
Other
Costly
Execution 250ms
Transfer 19 KB
Monthly Cost €3/mo
ona.com
Other
Optional
Execution 185ms
Transfer 224 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 167ms
Transfer 0 KB
Monthly Cost €2/mo
ona.com
Other
Optional
Execution 166ms
Transfer 5 KB
Monthly Cost €2/mo
ona.com
Other
Optional
Execution 117ms
Transfer 154 KB
Unused 60%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 78ms
Transfer 157 KB
Unused 45%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 59ms
Transfer 173 KB
Unused 39%
Monthly Cost €1/mo
ona.com
Other
Optional
Execution 58ms
Transfer 27 KB
Monthly Cost €1/mo
ona.com
Other
Optional
Execution 51ms
Transfer 2 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • ona.com adds 339ms and costs ~€4/month
  • ona.com adds 250ms and costs ~€3/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

ona.com takes 339ms 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

ona.com takes 250ms 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

60% of ona.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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