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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
5
PASS
5
INFO
2

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

Mobile Desktop
72
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.

2.07 s

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

2.69 s

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

126 ms

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

0.023

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

2.07 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.

2.83 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
15
5 PASS 5 REVIEW 3 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
D
Page Weight Inventory
Action
17 resources · 1.4 MB · 253 KB savings available
FIX
17 resources · 1.4 MB · 253 KB savings available
Warning::
Page weight 370 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~253 KB of savings available
Warning::
16 third-party resources (100% of weight)
Info::
1 resources over 200KB
17 resources · 1.4 MiB · 16 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% · 7.3 KiB
Document 0% · 1.8 KiB

~252.9 KiB of savings available

Remove unused JavaScript: 252.9 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, 17 requests
REVIEW
1.4 MB transferred, 17 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::
17 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
17 requests
0.29 g CO2 per page load
JavaScript 1.2 MiB 90%
CSS 95.0 KiB 7%
Other 30.2 KiB 2%
Images 5.3 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

B
Image Optimization
7 images, 0 KB saveable
REVIEW
7 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.
7 images 5 KB
0 oversized -0 KB
6 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

B
JS Execution Cost
923ms total JS execution
REVIEW
923ms total JS execution
Warning::
https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0...: 446ms CPU time
Info::
Unattributable: 202ms CPU time
Info::
https://www.cve.org/: 165ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-YNQP...: 110ms CPU time
Warning::
Third-party scripts: 923ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 30% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0263-4cca-abac-9adddada4f3b/osano.js446ms392ms10ms3rd
Unattributable202ms2ms0ms3rd
https://www.cve.org/165ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-YNQP3SNVSD&l=dataLayer110ms85ms15ms3rd
C
JS Bundles
Action
4 scripts, 253 KB unused
REVIEW
4 scripts, 253 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...: 66 KB unused (43%)
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: 253 KB
253 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 KB66 KB (43%)✓3rd
https://cmp.osano.com/AzyhULTdPkqmy4aDN/46057d56-0263-4cca-abac-9adddada4f3b/osano.js74 KB25 KB (34%)✓3rd
blob:https://www.cve.org/c17fe227-c599-4f1a-aed8-4b7d0e32e42d-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+
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
Network Waterfall
17 requests over 2825ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 2.1 s LCP 2.7 shttps://cve.org// https://cve.org/ — 301 — 880 B — 377 ms — h2https://www.cve.org/www.cve.org/ https://www.cve.org/ — 200 — 1.8 KiB — 154 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 — 36 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 — 688 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 — 304 ms — h2blob:https://www.cve.org/c17fe227-c599-4f1a-aed8-4b7d0e32e42dwww.cve.org/c17fe227-c599-4f1a-aed8... blob:https://www.cve.org/c17fe227-c599-4f1a-aed8-4b7d0e32e42d — 200 — -1 B — 31 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 — 248 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 — 287 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 — 161 ms — h2https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~118463800&es=1&e=gtm.init&eid=2&u=AAAAAAAAAAAAAACA&h=Ag&tr=1ogt1pdatav2.1ccdgafirst.1setproductsettings.1ccdgaregscope.1ccdemdownload.1ccdemoutboundclick.1ccdempageview.1ccdemscroll.1ccdemsitesearch.1ccdemvideo.1ccdconversionmarking.1ccdgalast&ti=2ogt1pdatav2.2ccdgafirst.2setproductsettings.2ccdgaregscope.2ccdemdownload.2ccdemoutboundclick.2ccdempageview.2ccdemscroll.2ccdemsitesearch.2ccdemvideo.2ccdconversionmarking.2ccdgalast&z=0www.googletagmanager.com/a?id=G-YNQ... https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~118463800&es=1&e=gtm.init&eid=2&u=AAAAAAAAAAAAAACA&h=Ag&tr=1ogt1pdatav2.1ccdgafirst.1setproductsettings.1ccdgaregscope.1ccdemdownload.1ccdemoutboundclick.1ccdempageview.1ccdemscroll.1ccdemsitesearch.1ccdemvideo.1ccdconversionmarking.1ccdgalast&ti=2ogt1pdatav2.2ccdgafirst.2setproductsettings.2ccdgaregscope.2ccdemdownload.2ccdemoutboundclick.2ccdempageview.2ccdemscroll.2ccdemsitesearch.2ccdemvideo.2ccdconversionmarking.2ccdgalast&z=0 — 200 — 59 B — 59 ms — h2https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~118463800&es=1&e=gtm.js&eid=3&u=AAAAAAAAAAAAAACA&h=Ag&tr=1gct&ti=2gct&z=0www.googletagmanager.com/a?id=G-YNQ... https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~118463800&es=1&e=gtm.js&eid=3&u=AAAAAAAAAAAAAACA&h=Ag&tr=1gct&ti=2gct&z=0 — 200 — 49 B — 60 ms — h2https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~117512543~118463800&es=1&e=gtag.config&eid=9&u=AAAAAAAAAAAAACCA&h=Ag&epr=1G.3G&z=0www.googletagmanager.com/a?id=G-YNQ... https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~117512543~118463800&es=1&e=gtag.config&eid=9&u=AAAAAAAAAAAAACCA&h=Ag&epr=1G.3G&z=0 — 200 — 49 B — 61 ms — h2https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~117512543~118463800&es=1&e=*&eid=10&u=AAAAggAAAAAAACCA&h=Ag&epr=1G.3G&z=0www.googletagmanager.com/a?id=G-YNQ... https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~117512543~118463800&es=1&e=*&eid=10&u=AAAAggAAAAAAACCA&h=Ag&epr=1G.3G&z=0 — 200 — 49 B — 57 ms — h2https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~117512543~118463800&es=1&e=gtm.dom&eid=11&u=AAAAggAAAAAAACCA&h=Ag&z=0www.googletagmanager.com/a?id=G-YNQ... https://www.googletagmanager.com/a?id=G-YNQP3SNVSD&v=3&t=t&pid=1417869263&gtm=45je64h1v880699095za200zd880699095&cv=1&rv=64h1&tc=13&tag_exp=0~115938466~115938469~117266400~117512543~118463800&es=1&e=gtm.dom&eid=11&u=AAAAggAAAAAAACCA&h=Ag&z=0 — 200 — 49 B — 55 ms — h2https://www.cve.org/cvePurpleVFavicon.svgwww.cve.org/cvePurpleVFavicon.svg https://www.cve.org/cvePurpleVFavicon.svg — 200 — 2.0 KiB — 147 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 923ms · 228KB · €10/mo
cmp.osano.com
Other
Costly
Execution 446ms
Transfer 74 KB
Unused 34%
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 202ms
Transfer 0 KB
Monthly Cost €2/mo
www.cve.org
Other
Optional
Execution 165ms
Transfer 2 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 110ms
Transfer 152 KB
Unused 43%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • cmp.osano.com adds 446ms and costs ~€5/month
  • Unattributable adds 202ms 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

cmp.osano.com takes 446ms 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 202ms 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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