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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
49
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.
73
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.

3.06 s

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

4.38 s

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

2.23 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.

4.21 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.

20.42 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 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 184 requests
FIX
3.1 MB transferred, 184 requests
Warning::
Page weighs 11.7 MB (3.1 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Warning::
184 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
184 requests
0.65 g CO2 per page load
JavaScript 1.7 MiB 57%
Images 759.6 KiB 24%
Other 402.6 KiB 13%
Fonts 87.4 KiB 3%
Other 61.8 KiB 2%
HTML 52.3 KiB 2%
Other 7.0 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
9187ms total JS execution
FIX
9187ms total JS execution
Warning::
https://www.sonarsource.com/products/sonarqube/: 1721ms CPU time
Warning::
Unattributable: 1544ms CPU time
Warning::
https://www.sonarsource.com/app-3172a3c071dab32cdd...: 1319ms CPU time
Warning::
https://www.sonarsource.com/framework-61f603174610...: 1240ms CPU time
Warning::
https://euob.sd19403.sonarsource.com/sxp/i/ec9ce14...: 884ms CPU time
Warning::
Third-party scripts: 9187ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 22% Style & Layout 16% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.sonarsource.com/products/sonarqube/1721ms79ms7ms3rd
Unattributable1544ms50ms0ms3rd
https://www.sonarsource.com/app-3172a3c071dab32cddeb.js1319ms671ms202ms3rd
https://www.sonarsource.com/framework-61f603174610bdecf74e.js1240ms1143ms12ms3rd
https://euob.sd19403.sonarsource.com/sxp/i/ec9ce1449fc9fe8879e7b666ca8b5629.js884ms702ms14ms3rd
https://www.sonarsource.com/c8f7fe3b0e41be846d5687592cf2018ff6e22687-72ade12da2482d7c03c6.js541ms445ms73ms3rd
https://www.sonarsource.com/commons-8890b03468a586edcd23.js525ms397ms30ms3rd
https://www.googletagmanager.com/gtag/js?id=G-9JZ0GZ5TC6&cx=c&gtm=4e6460519ms434ms77ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-56V34P9436ms295ms54ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-757017194&cx=c&gtm=4e6460143ms103ms38ms3rd

Showing top 10 of 14 scripts

F
JS Bundles
Action
44 scripts, 652 KB unused
FIX
44 scripts, 652 KB unused
Warning::
https://www.sonarsource.com/c8f7fe3b0e41be846d5687...: 158 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sonarsource.com/035c3a5dbce655498ebf42...: 88 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sonarsource.com/8833ea00-e34c0439f77f6...: 87 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-757...: 82 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-56V...: 76 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 652 KB
652 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.sonarsource.com/c8f7fe3b0e41be846d5687592cf2018ff6e22687-72ade12da2482d7c03c6.js267 KB158 KB (59%)✓3rd
https://www.sonarsource.com/035c3a5dbce655498ebf426080fef9033b4583db-393df6d1dadc0f643d8e.js109 KB88 KB (81%)✓3rd
https://www.sonarsource.com/8833ea00-e34c0439f77f61bc800e.js285 KB87 KB (38%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-757017194&cx=c&gtm=4e6460132 KB82 KB (63%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-56V34P9178 KB76 KB (43%)✓3rd
https://www.sonarsource.com/commons-8890b03468a586edcd23.js116 KB58 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-9JZ0GZ5TC6&cx=c&gtm=4e6460178 KB56 KB (31%)✓3rd
https://www.sonarsource.com/app-3172a3c071dab32cddeb.js262 KB47 KB (18%)✓3rd
https://www.sonarsource.com/2894-23348090f84819db458b.js3 KB—✓3rd
https://www.sonarsource.com/9ff5b10e-640ccabbb82dfbce3884.js3 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

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

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: no-store, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, max-age=0

DirectiveValueMeaning
no-store—Never cache this response
max-age0Cache for 0 seconds
B
Image Optimization
82 images, 0 KB saveable
REVIEW
82 images, 0 KB saveable
Warning::
https://www.sonarsource.com/assets/icon_language.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
82 images 760 KB
0 oversized -0 KB
72 legacy format
1 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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 (87 KB)
PASS
3 fonts (87 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

87 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 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.1 s LCP 4.4 shttps://www.sonarsource.com/fonts/inter/inter-v20-latin-opsz-normal.woff2inter-v20-latin-opsz-no... https://www.sonarsource.com/fonts/inter/inter-v20-latin-opsz-normal.woff2 — 71.7 KiB — 0 ms — font-display: swaphttps://www.sonarsource.com/fonts/poppins/poppins-v24-latin-400.woff2poppins-v24-latin-400.w... https://www.sonarsource.com/fonts/poppins/poppins-v24-latin-400.woff2 — 7.8 KiB — 0 ms — font-display: swaphttps://www.sonarsource.com/fonts/poppins/poppins-v24-latin-600.woff2poppins-v24-latin-600.w... https://www.sonarsource.com/fonts/poppins/poppins-v24-latin-600.woff2 — 7.9 KiB — 0 ms — font-display: swap
inter-v20-latin-opsz-no... woff2 swap
Size 72 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
poppins-v24-latin-400.w... woff2 swap
Size 8 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
poppins-v24-latin-600.w... woff2 swap
Size 8 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
—

3 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
184 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 9187ms · 1611KB · €27/mo
www.sonarsource.com
Other
Costly
Execution 1721ms
Transfer 52 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 1544ms
Transfer 0 KB
Monthly Cost €5/mo
www.sonarsource.com
Other
Costly
Execution 1319ms
Transfer 262 KB
Unused 18%
Monthly Cost €4/mo
www.sonarsource.com
Other
Costly
Execution 1240ms
Transfer 43 KB
Monthly Cost €4/mo
euob.sd19403.sonarsource.com
Other
Costly
Execution 884ms
Transfer 45 KB
Monthly Cost €3/mo
www.sonarsource.com
Other
Costly
Execution 541ms
Transfer 267 KB
Unused 59%
Monthly Cost €2/mo
www.sonarsource.com
Other
Costly
Execution 525ms
Transfer 116 KB
Unused 51%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 519ms
Transfer 178 KB
Unused 31%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Costly
Execution 436ms
Transfer 178 KB
Unused 43%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 143ms
Transfer 132 KB
Unused 63%
Monthly Cost €0/mo
cdn.equalweb.com
Other
Optional
Execution 140ms
Transfer 16 KB
Monthly Cost €0/mo
www.sonarsource.com
Other
Optional
Execution 67ms
Transfer 4 KB
Monthly Cost €0/mo
www.sonarsource.com
Other
Optional
Execution 57ms
Transfer 285 KB
Unused 38%
Monthly Cost €0/mo
www.sonarsource.com
Other
Optional
Execution 51ms
Transfer 35 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.sonarsource.com adds 1721ms and costs ~€5/month
  • Unattributable adds 1544ms and costs ~€5/month
  • www.sonarsource.com adds 1319ms and costs ~€4/month
  • www.sonarsource.com adds 1240ms and costs ~€4/month
  • euob.sd19403.sonarsource.com adds 884ms and costs ~€3/month
  • www.sonarsource.com adds 541ms and costs ~€2/month
  • www.sonarsource.com adds 525ms and costs ~€2/month
  • Google Tag Manager adds 519ms and costs ~€2/month
  • Google Tag Manager adds 436ms and costs ~€1/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

www.sonarsource.com takes 1721ms 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 1544ms 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

www.sonarsource.com takes 1319ms 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

www.sonarsource.com takes 1240ms 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

euob.sd19403.sonarsource.com takes 884ms 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

www.sonarsource.com takes 541ms 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

59% of www.sonarsource.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

www.sonarsource.com takes 525ms 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

51% of www.sonarsource.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

Google Tag Manager takes 519ms 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 436ms 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

63% of Google Tag Manager'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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