Skip to content
https://casio.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
2
PASS
11
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
88
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
82
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.

3.44 s

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

3.74 s

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

258 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.

3.44 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.

4.21 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
17
11 PASS 2 REVIEW 2 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 (347.7 KiB of 347.9 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3519ms total JS execution
FIX
3519ms total JS execution
Warning::
https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/...: 1531ms CPU time
Warning::
https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/...: 1469ms CPU time
Warning::
Unattributable: 460ms CPU time
Info::
https://www.casio.com/us/: 58ms CPU time
Warning::
Third-party scripts: 3519ms (100% of total)

Main Thread Breakdown

Script Evaluation 80% Other 13% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/tkmibJca/VFx1cGdeLAQ/Lm5qKzRe/JXAPAg?v=6074ec5d-991b-dd88-6a9f-ac6d85f517d8&t=7226850071531ms1416ms77ms3rd
https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/OOmibJDrQmJXfh/SixucGdeLAQ/AV4EYQY9/Q10B1469ms1209ms60ms3rd
Unattributable460ms187ms0ms3rd
https://www.casio.com/us/58ms8ms2ms3rd
B
JS Bundles
4 scripts, 68 KB unused
REVIEW
4 scripts, 68 KB unused
Warning::
https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/...: 36 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/...: 32 KB unused (20%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 68 KB
68 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/OOmibJDrQmJXfh/SixucGdeLAQ/AV4EYQY9/Q10B169 KB36 KB (21%)✓3rd
https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/tkmibJca/VFx1cGdeLAQ/Lm5qKzRe/JXAPAg?v=6074ec5d-991b-dd88-6a9f-ac6d85f517d8&t=722685007162 KB32 KB (20%)✓3rd
blob:https://www.casio.com/71465787-42f1-446a-81ca-e548fce936ec0 KB—✓3rd
blob:https://www.casio.com/53a56398-8f26-42a3-bdd4-747c473bd8e50 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

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

Green Hosting

No green hosting detected

A+
Page Weight Budget
348 KB transferred, 15 requests
PASS
348 KB transferred, 15 requests
Info::
Page weighs 985 KB (348 KB transferred)
Info::
15 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
348 KB / 2.4 MB budget
348 KB transferred
15 requests
0.07 g CO2 per page load
JavaScript 331.1 KiB 95%
HTML 5.5 KiB 2%
Fonts 4.9 KiB 1%
Other 3.5 KiB 1%
Other 2.9 KiB 1%
0 2.4 MB 4.9 MB
Under budget
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
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (5 KB)
PASS
2 fonts (5 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

5 KB total

Render-blocking

0

of 2

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 3.4 s LCP 3.7 shttps://www.casio.com/etc.clientlibs/casio/clientlibs/clientlib-site/resources/fonts/icon/icon-casio.wofficon-casio.woff https://www.casio.com/etc.clientlibs/casio/clientlibs/clientlib-site/resources/fonts/icon/icon-casio.woff — 4.9 KiB — 89 ms — font-display: swaphttps://www.casio.com/etc.clientlibs/casio/clientlibs/clientlib-site/resources/fonts/icon/icon-casio.wofficon-casio.woff https://www.casio.com/etc.clientlibs/casio/clientlibs/clientlib-site/resources/fonts/icon/icon-casio.woff — 0 B — 5 ms — font-display: swap
icon-casio.woff woff swap
Size 5 KB
Load time 89 ms
Start 346 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
icon-casio.woff woff swap
Size 0 KB
Load time 5 ms
Start 4.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~1 KB and ~2 ms

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
Page Weight Inventory
15 resources · 348 KB · 68 KB savings available
PASS
15 resources · 348 KB · 68 KB savings available
Info::
Within 1MB page-weight target
Got: 348 KB
Info::
~68 KB of savings available
Warning::
14 third-party resources (100% of weight)
15 resources · 347.9 KiB · 14 third-party Within 1MB page-weight target
JavaScript 95% · 331.1 KiB
Document 2% · 5.6 KiB
Other 2% · 5.4 KiB
Font 1% · 4.9 KiB
Image 0% · 831 B

~67.9 KiB of savings available

Remove unused JavaScript: 67.9 KiB
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
A
HTTP Caching
max-age=172800 (2 days)
PASS
max-age=172800 (2 days)
Info::
Cache-Control header is set
Got: max-age=172800
Info::
Effective TTL: 2 days (max-age=172800)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=172800

DirectiveValueMeaning
max-age172800Cache for 2 days
Effective TTL: 172800 seconds
Network Waterfall
15 requests over 3985ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 3.4 s LCP 3.7 shttps://casio.com// https://casio.com/ — 301 — 150 B — 110 ms — h2https://www.casio.com/www.casio.com/ https://www.casio.com/ — 302 — 2.6 KiB — 96 ms — h2https://www.casio.com/us/www.casio.com/us/ https://www.casio.com/us/ — 200 — 3.3 KiB — 128 ms — h2https://www.casio.com/etc.clientlibs/casio/clientlibs/clientlib-site/resources/fonts/icon/icon-casio.woffwww.casio.com/etc.clientlibs/casio/... https://www.casio.com/etc.clientlibs/casio/clientlibs/clientlib-site/resources/fonts/icon/icon-casio.woff — 200 — 4.9 KiB — 89 ms — h2https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/tkmibJca/VFx1cGdeLAQ/Lm5qKzRe/JXAPAg?v=6074ec5d-991b-dd88-6a9f-ac6d85f517d8&t=722685007www.casio.com/ECl5bQX_/sg9/NnR/I-xk... https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/tkmibJca/VFx1cGdeLAQ/Lm5qKzRe/JXAPAg?v=6074ec5d-991b-dd88-6a9f-ac6d85f517d8&t=722685007 — 200 — 161.6 KiB — 63 ms — h2https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/OOmibJDrQmJXfh/SixucGdeLAQ/AV4EYQY9/Q10Bwww.casio.com/ECl5bQX_/sg9/NnR/I-xk... https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/OOmibJDrQmJXfh/SixucGdeLAQ/AV4EYQY9/Q10B — 200 — 169.5 KiB — 70 ms — h2https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/OOmibJDrQmJXfh/SixucGdeLAQ/AV4EYQY9/Q10Bwww.casio.com/ECl5bQX_/sg9/NnR/I-xk... https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/OOmibJDrQmJXfh/SixucGdeLAQ/AV4EYQY9/Q10B — 201 — 1.0 KiB — 417 ms — h2https://www.casio.com/favicon.icowww.casio.com/favicon.ico https://www.casio.com/favicon.ico — 200 — 831 B — 33 ms — h2blob:https://www.casio.com/71465787-42f1-446a-81ca-e548fce936ecwww.casio.com/71465787-42f1-446a-81... blob:https://www.casio.com/71465787-42f1-446a-81ca-e548fce936ec — -1 — 0 B — 0 ms — blob:https://www.casio.com/53a56398-8f26-42a3-bdd4-747c473bd8e5www.casio.com/53a56398-8f26-42a3-bd... blob:https://www.casio.com/53a56398-8f26-42a3-bdd4-747c473bd8e5 — -1 — 0 B — 0 ms — https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/OOmibJDrQmJXfh/SixucGdeLAQ/AV4EYQY9/Q10Bwww.casio.com/ECl5bQX_/sg9/NnR/I-xk... https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/OOmibJDrQmJXfh/SixucGdeLAQ/AV4EYQY9/Q10B — 201 — 1.1 KiB — 348 ms — h2https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/tkmibJca/VFx1cGdeLAQ/Lm5qKzRe/JXAPAg?t=722685007www.casio.com/ECl5bQX_/sg9/NnR/I-xk... https://www.casio.com/ECl5bQX_/sg9/NnR/I-xkArBoVV/tkmibJca/VFx1cGdeLAQ/Lm5qKzRe/JXAPAg?t=722685007 — 200 — 762 B — 188 ms — h2https://www.casio.com/us/www.casio.com/us/ https://www.casio.com/us/ — 403 — 2.2 KiB — 99 ms — h2https://www.casio.com/etc.clientlibs/casio/clientlibs/clientlib-site/resources/fonts/icon/icon-casio.woffwww.casio.com/etc.clientlibs/casio/... https://www.casio.com/etc.clientlibs/casio/clientlibs/clientlib-site/resources/fonts/icon/icon-casio.woff — 200 — 0 B — 5 ms — h2https://www.casio.com/favicon.icowww.casio.com/favicon.ico https://www.casio.com/favicon.ico — 200 — 0 B — 7 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 3519ms · 165KB · $47/mo
www.casio.com
Other
Costly
Execution 1531ms
Transfer 162 KB
Unused 20%
Monthly Cost $20/mo
www.casio.com
Other
Costly
Execution 1469ms
Transfer 1 KB
Unused 21%
Monthly Cost $20/mo
Unattributable
Other
Costly
Execution 460ms
Transfer 0 KB
Monthly Cost $6/mo
www.casio.com
Other
Optional
Execution 58ms
Transfer 2 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.casio.com adds 1531ms and costs ~$20/month
  • www.casio.com adds 1469ms and costs ~$20/month
  • Unattributable adds 460ms and costs ~$6/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.casio.com takes 1531ms 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.casio.com takes 1469ms 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 460ms 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.

Send Feedback