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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

8.42 s

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

10.81 s

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

898 ms

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

0.078

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

8.42 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.

11.62 s

Page Load Progression

382 ms
765 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
17
8 PASS 3 REVIEW 4 FIX
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 (1.4 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3592ms total JS execution
FIX
3592ms total JS execution
Warning::
https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0...: 1847ms CPU time
Warning::
Unattributable: 755ms CPU time
Warning::
https://www.cve.org/: 468ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-YNQP...: 416ms CPU time
Info::
https://www.cve.org/assets/index-TGm7PKFI.css: 55ms CPU time
Warning::
Third-party scripts: 3592ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Other 30% Style & Layout 7% Script Parsing & Compilation 4% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0263-4cca-abac-9adddada4f3b/osano.js1847ms1559ms56ms3rd
Unattributable755ms6ms0ms3rd
https://www.cve.org/468ms5ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-YNQP3SNVSD&l=dataLayer416ms313ms60ms3rd
https://www.cve.org/assets/index-TGm7PKFI.css55ms0ms0ms3rd
https://www.cve.org/assets/index-JYrJuQZF.js51ms18ms14ms3rd
D
Page Weight Inventory
Action
12 resources · 1.4 MB · 255 KB savings available
FIX
12 resources · 1.4 MB · 255 KB savings available
Warning::
Page weight 370 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~255 KB of savings available
Warning::
11 third-party resources (100% of weight)
Info::
1 resources over 200KB
12 resources · 1.4 MiB · 11 third-party 369.8 KiB over 1MB target
JavaScript 90% · 1.2 MiB
CSS 7% · 95.0 KiB
Other 2% · 31.1 KiB
Image 1% · 7.0 KiB
Document 0% · 1.8 KiB

~255.0 KiB of savings available

Remove unused JavaScript: 255.0 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Page Weight Budget
1.4 MB transferred, 12 requests
REVIEW
1.4 MB transferred, 12 requests
Info::
Page weighs 5.6 MB (1.4 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::
12 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
12 requests
0.29 g CO2 per page load
JavaScript 1.2 MiB 90%
CSS 95.0 KiB 7%
Other 30.2 KiB 2%
Images 5.0 KiB 0%
Other 2.8 KiB 0%
HTML 1.8 KiB 0%
0 2.4 MB 4.9 MB
Under 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

C
JS Bundles
Action
4 scripts, 255 KB unused
REVIEW
4 scripts, 255 KB unused
Warning::
https://www.cve.org/assets/index-JYrJuQZF.js: 162 KB unused (16%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-YNQP...: 68 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0...: 25 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 255 KB
255 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.cve.org/assets/index-JYrJuQZF.js1033 KB162 KB (16%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-YNQP3SNVSD&l=dataLayer152 KB68 KB (45%)✓3rd
https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0263-4cca-abac-9adddada4f3b/osano.js74 KB25 KB (34%)✓3rd
blob:https://www.cve.org/8f7815f0-c2cc-4272-838a-0f8e8fc2e905-0 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
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
Image Optimization
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Warning::
https://www.cve.org/assets/cvePartnershipGraphic-D... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
2 images 5 KB
0 oversized -0 KB
1 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

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+
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
12 requests over 3024ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 8.4 s LCP 10.8 shttps://cve.org// https://cve.org/ — 301 — 882 B — 415 ms — h2https://www.cve.org/www.cve.org/ https://www.cve.org/ — 200 — 1.8 KiB — 196 ms — h2https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0263-4cca-abac-9adddada4f3b/osano.jscmp.osano.com/AzyhULTdPkqmy4aDN/460... https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0263-4cca-abac-9adddada4f3b/osano.js — 200 — 73.8 KiB — 25 ms — h3https://www.cve.org/assets/index-JYrJuQZF.jswww.cve.org/assets/index-JYrJuQZF.j... https://www.cve.org/assets/index-JYrJuQZF.js — 200 — 1.0 MiB — 723 ms — h2https://www.cve.org/assets/index-TGm7PKFI.csswww.cve.org/assets/index-TGm7PKFI.c... https://www.cve.org/assets/index-TGm7PKFI.css — 200 — 95.0 KiB — 722 ms — h2blob:https://www.cve.org/8f7815f0-c2cc-4272-838a-0f8e8fc2e905www.cve.org/8f7815f0-c2cc-4272-838a... blob:https://www.cve.org/8f7815f0-c2cc-4272-838a-0f8e8fc2e905 — 200 — -1 B — 33 ms — blobhttps://www.cve.org/cve-partner-name-map.jsonwww.cve.org/cve-partner-name-map.js... https://www.cve.org/cve-partner-name-map.json — 200 — 29.5 KiB — 238 ms — h2https://www.googletagmanager.com/gtag/js?id=G-YNQP3SNVSD&l=dataLayerwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-YNQP3SNVSD&l=dataLayer — 200 — 151.9 KiB — 252 ms — h2data:image/svg+xml;base64,PHN2ZyBpZD0iTGF5ZXJfMSIgZGF0YS1uYW1lPSJMYXllciAxIiB4bWxucz0iaHR0cDovL3d3d…data:image/svg+xml;base64,PHN2ZyBpZ... data:image/svg+xml;base64,PHN2ZyBpZD0iTGF5ZXJfMSIgZGF0YS1uYW1lPSJMYXllciAxIiB4bWxucz0iaHR0cDovL3d3d… — 200 — 0 B — 0 ms — datahttps://cveawg.mitre.org/api/cve_count?state=publishedcveawg.mitre.org/api/cve_count?stat... https://cveawg.mitre.org/api/cve_count?state=published — 200 — 670 B — 1.2 s — h2https://www.cve.org/assets/cvePartnershipGraphic-DXbTweJX.svgwww.cve.org/assets/cvePartnershipGr... https://www.cve.org/assets/cvePartnershipGraphic-DXbTweJX.svg — 200 — 5.0 KiB — 142 ms — h2https://www.cve.org/cvePurpleVFavicon.svgwww.cve.org/cvePurpleVFavicon.svg https://www.cve.org/cvePurpleVFavicon.svg — 200 — 2.0 KiB — 148 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 3592ms · 1356KB · €39/mo
cmp.osano.com
Other
Costly
Execution 1847ms
Transfer 74 KB
Unused 34%
Monthly Cost €20/mo
Unattributable
Other
Costly
Execution 755ms
Transfer 0 KB
Monthly Cost €8/mo
www.cve.org
Other
Costly
Execution 468ms
Transfer 2 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 416ms
Transfer 152 KB
Unused 45%
Monthly Cost €5/mo
www.cve.org
Other
Optional
Execution 55ms
Transfer 95 KB
Monthly Cost €1/mo
www.cve.org
Other
Optional
Execution 51ms
Transfer 1033 KB
Unused 16%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • cmp.osano.com adds 1847ms and costs ~€20/month
  • Unattributable adds 755ms and costs ~€8/month
  • www.cve.org adds 468ms and costs ~€5/month
  • Google Tag Manager adds 416ms and costs ~€5/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

cmp.osano.com takes 1847ms 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 755ms 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.cve.org takes 468ms 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 416ms 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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