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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
50
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

2.08 s

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

11.04 s

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

1.06 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.

3.12 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.

11.29 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
16
7 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
13.0 MB transferred, 69 requests
FIX
13.0 MB transferred, 69 requests
Critical::
Page weighs 15.2 MB (13.0 MB transferred)
Warning::
JavaScript is 984 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 984 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::
69 HTTP requests
Info::
Estimated 2.7 g CO2 per page load
13.0 MB / 2.4 MB budget
13.0 MB transferred
69 requests
2.7 g CO2 per page load
Other 11.7 MiB 90%
JavaScript 983.6 KiB 7%
Fonts 200.3 KiB 2%
Images 76.8 KiB 1%
CSS 27.0 KiB 0%
HTML 19.3 KiB 0%
Other 18.4 KiB 0%
Other 4.9 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
F
JS Execution Cost
Action
4406ms total JS execution
FIX
4406ms total JS execution
Warning::
https://ona.com/_next/static/chunks/8497-9eef2f9e0...: 938ms CPU time
Warning::
Unattributable: 668ms CPU time
Warning::
https://ona.com/_next/static/chunks/1684-920f26c8b...: 624ms CPU time
Warning::
https://ona.com/: 537ms CPU time
Warning::
https://ona.com/_next/static/chunks/a4634e51-1edca...: 398ms CPU time
Warning::
Third-party scripts: 4406ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 25% Style & Layout 8% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://ona.com/_next/static/chunks/8497-9eef2f9e09183f7c.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU938ms857ms56ms3rd
Unattributable668ms29ms0ms3rd
https://ona.com/_next/static/chunks/1684-920f26c8bc9686e9.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU624ms489ms32ms3rd
https://ona.com/537ms13ms11ms3rd
https://ona.com/_next/static/chunks/a4634e51-1edca49e0237387d.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU398ms222ms42ms3rd
https://ona.com/_next/static/chunks/8787-2a15ff454cd553a8.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU273ms92ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P4LP64V256ms211ms38ms3rd
https://ona.com/_next/static/chunks/4bd1b696-18463eebcae08e3d.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU230ms155ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=G-N7BXGH25CC211ms161ms48ms3rd
https://ona.com/_next/static/chunks/9394-1ed5100686ed099a.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU142ms84ms9ms3rd

Showing top 10 of 11 scripts

B
Image Optimization
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Info::
All images are well-optimized
16 images 77 KB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
29 scripts, 252 KB unused
REVIEW
29 scripts, 252 KB unused
Warning::
https://ona.com/_next/static/chunks/a4634e51-1edca...: 93 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: 252 KB
252 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ona.com/_next/static/chunks/a4634e51-1edca49e0237387d.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU154 KB93 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/1183-6e4bd8ab2e583449.js?dpl=dpl_ANCmi9Rr7dJ8jafCY3DERu4G47kU18 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 2.1 s LCP 11.0 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
7 hints, 0 missing preconnects
PASS
7 hints, 0 missing preconnects
Info::
Page uses 7 resource hint(s)

Current Resource Hints

preconnect
1
preload
5
dns-prefetch
1
prefetch
—

7 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
69 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 4406ms · 898KB · €48/mo
ona.com
Other
Costly
Execution 938ms
Transfer 224 KB
Monthly Cost €10/mo
Unattributable
Other
Costly
Execution 668ms
Transfer 0 KB
Monthly Cost €7/mo
ona.com
Other
Costly
Execution 624ms
Transfer 46 KB
Monthly Cost €7/mo
ona.com
Other
Costly
Execution 537ms
Transfer 19 KB
Monthly Cost €6/mo
ona.com
Other
Costly
Execution 398ms
Transfer 154 KB
Unused 60%
Monthly Cost €4/mo
ona.com
Other
Costly
Execution 273ms
Transfer 5 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 256ms
Transfer 157 KB
Unused 45%
Monthly Cost €3/mo
ona.com
Other
Costly
Execution 230ms
Transfer 53 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 211ms
Transfer 173 KB
Unused 39%
Monthly Cost €2/mo
ona.com
Other
Optional
Execution 142ms
Transfer 40 KB
Unused 54%
Monthly Cost €2/mo
ona.com
Other
Optional
Execution 128ms
Transfer 27 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • ona.com adds 938ms and costs ~€10/month
  • Unattributable adds 668ms and costs ~€7/month
  • ona.com adds 624ms and costs ~€7/month
  • ona.com adds 537ms and costs ~€6/month
  • ona.com adds 398ms and costs ~€4/month
  • ona.com adds 273ms and costs ~€3/month
  • Google Tag Manager adds 256ms and costs ~€3/month
  • ona.com adds 230ms and costs ~€2/month
  • Google Tag Manager adds 211ms and costs ~€2/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 938ms 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 668ms 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 624ms 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 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

ona.com takes 398ms 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

ona.com takes 273ms 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

Google Tag Manager takes 256ms 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 230ms 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

Google Tag Manager takes 211ms 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

54% 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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