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https://ocn.ne.jp

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
85
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.
96
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.

741 ms

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

2.18 s

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

143 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.

1.47 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.

2.56 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 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.5 MB transferred, 59 requests
FIX
3.5 MB transferred, 59 requests
Warning::
Page weighs 5.0 MB (3.5 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
Warning::
JavaScript is 790 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 790 KB
Info::
59 HTTP requests
Info::
Estimated 0.72 g CO2 per page load
3.5 MB / 2.4 MB budget
3.5 MB transferred
59 requests
0.72 g CO2 per page load
Images 2.6 MiB 75%
JavaScript 790.5 KiB 22%
HTML 54.6 KiB 2%
CSS 25.6 KiB 1%
Other 1.8 KiB 0%
Other 557 B 0%
Other 548 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

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 (3.5 MiB of 3.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
13 scripts, 337 KB unused
FIX
13 scripts, 337 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2VYT...: 75 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5XDK...: 73 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2750...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WQ8...: 64 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KK5...: 60 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 337 KB
337 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-2VYT9C383M&cx=c&gtm=4e64h1151 KB75 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-5XDKHMB5SV&cx=c&gtm=4e64h1144 KB73 KB (51%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2750JE9XQG&cx=c&gtm=4e64h1151 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQ8B89G&gtm=4e64h1133 KB64 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KK5LPR134 KB60 KB (45%)✓3rd
https://www.ocn.ne.jp/ocn_assets/pc/js/ocntop.js?id=1818ceb7749627ade8698a0af03dfafe13 KB—✓3rd
https://dev.visualwebsiteoptimizer.com/j.php?a=377405&u=https%3A%2F%2Fwww.ocn.ne.jp%2F&r=0.83069684597750433 KB—✓3rd
https://www.ocn.ne.jp/ocn_assets/pc/js/jquery-1.6.2.min.js?id=a1a8cb16a060f6280a767187fd22e03732 KB—✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NBDNR3S&gtm=4e64h10 KB—✓3rd
https://cdn.dmc.docomo.ne.jp/js/contents/union3.js0 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
Page Weight Inventory
Action
59 resources · 3.5 MB · 337 KB savings available
FIX
59 resources · 3.5 MB · 337 KB savings available
Warning::
Page weight 2.5 MB over 1MB target
Got: 3.5 MB Expected: ≤ 1 MB
Info::
~337 KB of savings available
Warning::
58 third-party resources (100% of weight)
Info::
4 resources over 200KB
59 resources · 3.5 MiB · 58 third-party 2.5 MiB over 1MB target
Image 75% · 2.6 MiB
JavaScript 22% · 790.5 KiB
Document 2% · 54.7 KiB
CSS 1% · 25.6 KiB
Other 0% · 1.1 KiB

~337.3 KiB of savings available

Remove unused JavaScript: 337.3 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.

C
Image Optimization
Action
39 images, 0 KB saveable
REVIEW
39 images, 0 KB saveable
Warning::
https://www.ocn.ne.jp/ocn_assets/pc/img/left_botto... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ocn.ne.jp/ocn_assets/pc/img/left_botto... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ocn.ne.jp/ocn_assets/pc/img/left_botto... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ocn.ne.jp/top_tools/left/left_top_bann... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ocn.ne.jp/ocn_assets/pc/img/241101_doc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
39 images 2.6 MB
0 oversized -0 KB
37 legacy format
5 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

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

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

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

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
820ms total JS execution
REVIEW
820ms total JS execution
Warning::
https://www.ocn.ne.jp/ocn_assets/pc/js/jquery-1.6....: 295ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KK5...: 140ms CPU time
Info::
Unattributable: 113ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-2750...: 77ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WQ8...: 66ms CPU time
Warning::
Third-party scripts: 820ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Style & Layout 27% Other 16% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.ocn.ne.jp/ocn_assets/pc/js/jquery-1.6.2.min.js?id=a1a8cb16a060f6280a767187fd22e037295ms54ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KK5LPR140ms127ms11ms3rd
Unattributable113ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2750JE9XQG&cx=c&gtm=4e64h177ms62ms14ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WQ8B89G&gtm=4e64h166ms55ms10ms3rd
https://www.ocn.ne.jp/65ms3ms1ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2VYT9C383M&cx=c&gtm=4e64h164ms48ms15ms3rd
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
59 requests over 2240ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 741 ms LCP 2.2 shttps://ocn.ne.jp// https://ocn.ne.jp/ — 301 — 84 B — 450 ms — h2https://www.ocn.ne.jp/www.ocn.ne.jp/ https://www.ocn.ne.jp/ — 200 — 54.6 KiB — 873 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/css/swiper.min.css?id=2603e9c21c62042a0e965d6430da7f19www.ocn.ne.jp/ocn_assets/pc/css/swi... https://www.ocn.ne.jp/ocn_assets/pc/css/swiper.min.css?id=2603e9c21c62042a0e965d6430da7f19 — 200 — 3.0 KiB — 17 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/js/jquery-1.6.2.min.js?id=a1a8cb16a060f6280a767187fd22e037www.ocn.ne.jp/ocn_assets/pc/js/jque... https://www.ocn.ne.jp/ocn_assets/pc/js/jquery-1.6.2.min.js?id=a1a8cb16a060f6280a767187fd22e037 — 200 — 31.8 KiB — 35 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/js/swiper.min.js?id=cabdd76e521b31cec9589102858f42e3www.ocn.ne.jp/ocn_assets/pc/js/swip... https://www.ocn.ne.jp/ocn_assets/pc/js/swiper.min.js?id=cabdd76e521b31cec9589102858f42e3 — 200 — 29.4 KiB — 32 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/js/jquery.lazyload.min.js?id=5c01d7aff077b4ed0804b71c2e3ab4a1www.ocn.ne.jp/ocn_assets/pc/js/jque... https://www.ocn.ne.jp/ocn_assets/pc/js/jquery.lazyload.min.js?id=5c01d7aff077b4ed0804b71c2e3ab4a1 — 200 — 1.6 KiB — 29 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/js/ocntop.js?id=1818ceb7749627ade8698a0af03dfafewww.ocn.ne.jp/ocn_assets/pc/js/ocnt... https://www.ocn.ne.jp/ocn_assets/pc/js/ocntop.js?id=1818ceb7749627ade8698a0af03dfafe — 200 — 12.6 KiB — 18 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308_tokuten_202512.pngwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308_tokuten_202512.png — 200 — 65.8 KiB — 33 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308_ahamo_202511.pngwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308_ahamo_202511.png — 200 — 400.6 KiB — 48 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/css/base3.css?id=dbf4136cc34c1a98b72e4520e28fbf16www.ocn.ne.jp/ocn_assets/pc/css/bas... https://www.ocn.ne.jp/ocn_assets/pc/css/base3.css?id=dbf4136cc34c1a98b72e4520e28fbf16 — 200 — 22.6 KiB — 43 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308px_hikariset_202511.pngwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308px_hikariset_202511.png — 200 — 80.6 KiB — 17 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/260401_2_ahamo_700x308.jpgwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/260401_2_ahamo_700x308.jpg — 200 — 315.7 KiB — 23 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/260401_2_mini_700x308.jpgwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/260401_2_mini_700x308.jpg — 200 — 367.2 KiB — 36 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/4_header_ocn.gifwww.ocn.ne.jp/ocn_assets/pc/img/4_h... https://www.ocn.ne.jp/ocn_assets/pc/img/4_header_ocn.gif — 200 — 3.0 KiB — 14 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-mypage.pngwww.ocn.ne.jp/ocn_assets/pc/img/ico... https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-mypage.png — 200 — 720 B — 17 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-support.pngwww.ocn.ne.jp/ocn_assets/pc/img/ico... https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-support.png — 200 — 698 B — 20 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-info.pngwww.ocn.ne.jp/ocn_assets/pc/img/ico... https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-info.png — 200 — 782 B — 18 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KK5LPRwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KK5LPR — 200 — 134.3 KiB — 113 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=377405&u=https%3A%2F%2Fwww.ocn.ne.jp%2F&r=0.8306968459775043dev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=377405&u=https%3A%2F%2Fwww.ocn.ne.jp%2F&r=0.8306968459775043 — 200 — 2.5 KiB — 53 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAATCAMAAACqTK3AAAAArlBMVEX//////////v7MADNnpnz+/…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAATCAMAAACqTK3AAAAArlBMVEX//////////v7MADNnpnz+/… — 200 — 0 B — 0 ms — datahttps://www.ocn.ne.jp/ocn_assets/pc/img/new_header_sprite.png?231201www.ocn.ne.jp/ocn_assets/pc/img/new... https://www.ocn.ne.jp/ocn_assets/pc/img/new_header_sprite.png?231201 — 200 — 5.8 KiB — 11 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/new_sprite.png?20201210www.ocn.ne.jp/ocn_assets/pc/img/new... https://www.ocn.ne.jp/ocn_assets/pc/img/new_sprite.png?20201210 — 200 — 29.1 KiB — 13 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAMAAAC7IEhfAAAAclBMVEUAAAD/AAD/AAD/AAD/AAD/A…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAMAAAC7IEhfAAAAclBMVEUAAAD/AAD/AAD/AAD/AAD/A… — 200 — 0 B — 0 ms — datahttps://www.ocn.ne.jp/top_tools/center/prod_internet_banner/images/ocnint_logo_white_250x110_202506131845.pngwww.ocn.ne.jp/top_tools/center/prod... https://www.ocn.ne.jp/top_tools/center/prod_internet_banner/images/ocnint_logo_white_250x110_202506131845.png — 200 — 6.5 KiB — 72 ms — h2https://www.ocn.ne.jp/top_tools/center/prod_internet_banner/images/500x220px_ahamo_202506131845.pngwww.ocn.ne.jp/top_tools/center/prod... https://www.ocn.ne.jp/top_tools/center/prod_internet_banner/images/500x220px_ahamo_202506131845.png — 200 — 6.4 KiB — 35 ms — h2https://www.ocn.ne.jp/top_tools/center/prod_denkigas/images/denki_700x308_20260401.pngwww.ocn.ne.jp/top_tools/center/prod... https://www.ocn.ne.jp/top_tools/center/prod_denkigas/images/denki_700x308_20260401.png — 200 — 170.7 KiB — 101 ms — h2https://www.ocn.ne.jp/top_tools/center/prod_denkigas/images/gas_700x308_260401.pngwww.ocn.ne.jp/top_tools/center/prod... https://www.ocn.ne.jp/top_tools/center/prod_denkigas/images/gas_700x308_260401.png — 200 — 39.3 KiB — 78 ms — h2https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260417_dpoint_giants_700%C3%97308.jpgwww.ocn.ne.jp/top_tools/center/camp... https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260417_dpoint_giants_700%C3%97308.jpg — 200 — 174.5 KiB — 109 ms — h2https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260401_point_700x308.pngwww.ocn.ne.jp/top_tools/center/camp... https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260401_point_700x308.png — 200 — 30.0 KiB — 98 ms — h2https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260401_2_max_700x308.jpgwww.ocn.ne.jp/top_tools/center/camp... https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260401_2_max_700x308.jpg — 200 — 325.7 KiB — 142 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 741 ms LCP 2.2 shttps://ocn.ne.jp// https://ocn.ne.jp/ — 301 — 84 B — 450 ms — h2https://www.ocn.ne.jp/www.ocn.ne.jp/ https://www.ocn.ne.jp/ — 200 — 54.6 KiB — 873 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/css/swiper.min.css?id=2603e9c21c62042a0e965d6430da7f19www.ocn.ne.jp/ocn_assets/pc/css/swi... https://www.ocn.ne.jp/ocn_assets/pc/css/swiper.min.css?id=2603e9c21c62042a0e965d6430da7f19 — 200 — 3.0 KiB — 17 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/js/jquery-1.6.2.min.js?id=a1a8cb16a060f6280a767187fd22e037www.ocn.ne.jp/ocn_assets/pc/js/jque... https://www.ocn.ne.jp/ocn_assets/pc/js/jquery-1.6.2.min.js?id=a1a8cb16a060f6280a767187fd22e037 — 200 — 31.8 KiB — 35 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/js/swiper.min.js?id=cabdd76e521b31cec9589102858f42e3www.ocn.ne.jp/ocn_assets/pc/js/swip... https://www.ocn.ne.jp/ocn_assets/pc/js/swiper.min.js?id=cabdd76e521b31cec9589102858f42e3 — 200 — 29.4 KiB — 32 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/js/jquery.lazyload.min.js?id=5c01d7aff077b4ed0804b71c2e3ab4a1www.ocn.ne.jp/ocn_assets/pc/js/jque... https://www.ocn.ne.jp/ocn_assets/pc/js/jquery.lazyload.min.js?id=5c01d7aff077b4ed0804b71c2e3ab4a1 — 200 — 1.6 KiB — 29 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/js/ocntop.js?id=1818ceb7749627ade8698a0af03dfafewww.ocn.ne.jp/ocn_assets/pc/js/ocnt... https://www.ocn.ne.jp/ocn_assets/pc/js/ocntop.js?id=1818ceb7749627ade8698a0af03dfafe — 200 — 12.6 KiB — 18 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308_tokuten_202512.pngwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308_tokuten_202512.png — 200 — 65.8 KiB — 33 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308_ahamo_202511.pngwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308_ahamo_202511.png — 200 — 400.6 KiB — 48 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/css/base3.css?id=dbf4136cc34c1a98b72e4520e28fbf16www.ocn.ne.jp/ocn_assets/pc/css/bas... https://www.ocn.ne.jp/ocn_assets/pc/css/base3.css?id=dbf4136cc34c1a98b72e4520e28fbf16 — 200 — 22.6 KiB — 43 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308px_hikariset_202511.pngwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/700x308px_hikariset_202511.png — 200 — 80.6 KiB — 17 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/260401_2_ahamo_700x308.jpgwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/260401_2_ahamo_700x308.jpg — 200 — 315.7 KiB — 23 ms — h2https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/260401_2_mini_700x308.jpgwww.ocn.ne.jp/top_tools/center/uppe... https://www.ocn.ne.jp/top_tools/center/upper_info_slide/images/260401_2_mini_700x308.jpg — 200 — 367.2 KiB — 36 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/4_header_ocn.gifwww.ocn.ne.jp/ocn_assets/pc/img/4_h... https://www.ocn.ne.jp/ocn_assets/pc/img/4_header_ocn.gif — 200 — 3.0 KiB — 14 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-mypage.pngwww.ocn.ne.jp/ocn_assets/pc/img/ico... https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-mypage.png — 200 — 720 B — 17 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-support.pngwww.ocn.ne.jp/ocn_assets/pc/img/ico... https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-support.png — 200 — 698 B — 20 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-info.pngwww.ocn.ne.jp/ocn_assets/pc/img/ico... https://www.ocn.ne.jp/ocn_assets/pc/img/icon-sv-info.png — 200 — 782 B — 18 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KK5LPRwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KK5LPR — 200 — 134.3 KiB — 113 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=377405&u=https%3A%2F%2Fwww.ocn.ne.jp%2F&r=0.8306968459775043dev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=377405&u=https%3A%2F%2Fwww.ocn.ne.jp%2F&r=0.8306968459775043 — 200 — 2.5 KiB — 53 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAATCAMAAACqTK3AAAAArlBMVEX//////////v7MADNnpnz+/…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAATCAMAAACqTK3AAAAArlBMVEX//////////v7MADNnpnz+/… — 200 — 0 B — 0 ms — datahttps://www.ocn.ne.jp/ocn_assets/pc/img/new_header_sprite.png?231201www.ocn.ne.jp/ocn_assets/pc/img/new... https://www.ocn.ne.jp/ocn_assets/pc/img/new_header_sprite.png?231201 — 200 — 5.8 KiB — 11 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/new_sprite.png?20201210www.ocn.ne.jp/ocn_assets/pc/img/new... https://www.ocn.ne.jp/ocn_assets/pc/img/new_sprite.png?20201210 — 200 — 29.1 KiB — 13 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAMAAAC7IEhfAAAAclBMVEUAAAD/AAD/AAD/AAD/AAD/A…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoCAMAAAC7IEhfAAAAclBMVEUAAAD/AAD/AAD/AAD/AAD/A… — 200 — 0 B — 0 ms — datahttps://www.ocn.ne.jp/top_tools/center/prod_internet_banner/images/ocnint_logo_white_250x110_202506131845.pngwww.ocn.ne.jp/top_tools/center/prod... https://www.ocn.ne.jp/top_tools/center/prod_internet_banner/images/ocnint_logo_white_250x110_202506131845.png — 200 — 6.5 KiB — 72 ms — h2https://www.ocn.ne.jp/top_tools/center/prod_internet_banner/images/500x220px_ahamo_202506131845.pngwww.ocn.ne.jp/top_tools/center/prod... https://www.ocn.ne.jp/top_tools/center/prod_internet_banner/images/500x220px_ahamo_202506131845.png — 200 — 6.4 KiB — 35 ms — h2https://www.ocn.ne.jp/top_tools/center/prod_denkigas/images/denki_700x308_20260401.pngwww.ocn.ne.jp/top_tools/center/prod... https://www.ocn.ne.jp/top_tools/center/prod_denkigas/images/denki_700x308_20260401.png — 200 — 170.7 KiB — 101 ms — h2https://www.ocn.ne.jp/top_tools/center/prod_denkigas/images/gas_700x308_260401.pngwww.ocn.ne.jp/top_tools/center/prod... https://www.ocn.ne.jp/top_tools/center/prod_denkigas/images/gas_700x308_260401.png — 200 — 39.3 KiB — 78 ms — h2https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260417_dpoint_giants_700%C3%97308.jpgwww.ocn.ne.jp/top_tools/center/camp... https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260417_dpoint_giants_700%C3%97308.jpg — 200 — 174.5 KiB — 109 ms — h2https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260401_point_700x308.pngwww.ocn.ne.jp/top_tools/center/camp... https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260401_point_700x308.png — 200 — 30.0 KiB — 98 ms — h2https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260401_2_max_700x308.jpgwww.ocn.ne.jp/top_tools/center/camp... https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260401_2_max_700x308.jpg — 200 — 325.7 KiB — 142 ms — h2https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260407_ahamo-used_10000-1000pt_700x308.jpgwww.ocn.ne.jp/top_tools/center/camp... https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260407_ahamo-used_10000-1000pt_700x308.jpg — 200 — 159.3 KiB — 110 ms — h2https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260407_mini_max-used_10000-1000pt_700x308.jpgwww.ocn.ne.jp/top_tools/center/camp... https://www.ocn.ne.jp/top_tools/center/campaign_info/images/260407_mini_max-used_10000-1000pt_700x308.jpg — 200 — 187.9 KiB — 129 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-news.pngwww.ocn.ne.jp/ocn_assets/pc/img/dme... https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-news.png — 200 — 3.4 KiB — 53 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-sports.pngwww.ocn.ne.jp/ocn_assets/pc/img/dme... https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-sports.png — 200 — 7.1 KiB — 42 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-weather.pngwww.ocn.ne.jp/ocn_assets/pc/img/dme... https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-weather.png — 200 — 3.9 KiB — 95 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-fortune.pngwww.ocn.ne.jp/ocn_assets/pc/img/dme... https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-fortune.png — 200 — 6.1 KiB — 74 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-transfer.pngwww.ocn.ne.jp/ocn_assets/pc/img/dme... https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-transfer.png — 200 — 9.6 KiB — 48 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-search.pngwww.ocn.ne.jp/ocn_assets/pc/img/dme... https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-search.png — 200 — 5.3 KiB — 58 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-dpoint.pngwww.ocn.ne.jp/ocn_assets/pc/img/dme... https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-dpoint.png — 200 — 3.9 KiB — 135 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-kuji.pngwww.ocn.ne.jp/ocn_assets/pc/img/dme... https://www.ocn.ne.jp/ocn_assets/pc/img/dmenu/icon-kuji.png — 200 — 7.5 KiB — 86 ms — h2https://www.ocn.ne.jp/top_tools/center/online_shop/images/img_ocnTop_01_250401_202503251509.jpgwww.ocn.ne.jp/top_tools/center/onli... https://www.ocn.ne.jp/top_tools/center/online_shop/images/img_ocnTop_01_250401_202503251509.jpg — 200 — 8.7 KiB — 101 ms — h2https://www.ocn.ne.jp/top_tools/center/online_shop/images/img_ocnTop_02_251203.jpgwww.ocn.ne.jp/top_tools/center/onli... https://www.ocn.ne.jp/top_tools/center/online_shop/images/img_ocnTop_02_251203.jpg — 200 — 9.8 KiB — 98 ms — h2https://www.ocn.ne.jp/top_tools/center/online_shop/images/cp3724_hikari_124x87_25710_202507081411.jpgwww.ocn.ne.jp/top_tools/center/onli... https://www.ocn.ne.jp/top_tools/center/online_shop/images/cp3724_hikari_124x87_25710_202507081411.jpg — 200 — 9.8 KiB — 103 ms — h2https://www.ocn.ne.jp/top_tools/left/left_top_banner/images/ocntop_215-80_c-202603.pngwww.ocn.ne.jp/top_tools/left/left_t... https://www.ocn.ne.jp/top_tools/left/left_top_banner/images/ocntop_215-80_c-202603.png — 200 — 18.0 KiB — 126 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/left_bottom_banner/banner_336_280-dlpa.jpgwww.ocn.ne.jp/ocn_assets/pc/img/lef... https://www.ocn.ne.jp/ocn_assets/pc/img/left_bottom_banner/banner_336_280-dlpa.jpg — 200 — 32.7 KiB — 126 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/left_bottom_banner/bohankyoshitsu2nd.jpgwww.ocn.ne.jp/ocn_assets/pc/img/lef... https://www.ocn.ne.jp/ocn_assets/pc/img/left_bottom_banner/bohankyoshitsu2nd.jpg — 200 — 26.8 KiB — 124 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/left_bottom_banner/stopkaizokuban2022_348-174.jpgwww.ocn.ne.jp/ocn_assets/pc/img/lef... https://www.ocn.ne.jp/ocn_assets/pc/img/left_bottom_banner/stopkaizokuban2022_348-174.jpg — 200 — 21.4 KiB — 130 ms — h2https://www.ocn.ne.jp/ocn_assets/pc/img/241101_docomo_rgb_slogan_logo.pngwww.ocn.ne.jp/ocn_assets/pc/img/241... https://www.ocn.ne.jp/ocn_assets/pc/img/241101_docomo_rgb_slogan_logo.png — 200 — 117.3 KiB — 136 ms — h2https://dev.visualwebsiteoptimizer.com/v.gif?cd=0&a=377405&d=ocn.ne.jp&u=D267F3E29DD0BBC9F0651048E62453A4C&h=3c1ceddb732013ede48d1c68f09e9d14&t=falsedev.visualwebsiteoptimizer.com/v.gi... https://dev.visualwebsiteoptimizer.com/v.gif?cd=0&a=377405&d=ocn.ne.jp&u=D267F3E29DD0BBC9F0651048E62453A4C&h=3c1ceddb732013ede48d1c68f09e9d14&t=false — 200 — 145 B — 118 ms — h2https://www.googletagmanager.com/gtag/js?id=G-2750JE9XQG&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-2750JE9XQG&cx=c&gtm=4e64h1 — 200 — 150.9 KiB — 76 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WQ8B89G&gtm=4e64h1www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WQ8B89G&gtm=4e64h1 — 200 — 133.1 KiB — 81 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NBDNR3S&gtm=4e64h1www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NBDNR3S&gtm=4e64h1 — -1 — 0 B — 46 ms — https://cdn.dmc.docomo.ne.jp/js/contents/union3.jscdn.dmc.docomo.ne.jp/js/contents/un... https://cdn.dmc.docomo.ne.jp/js/contents/union3.js — -1 — 0 B — 44 ms — https://cdn.dmc.docomo.ne.jp/js/contents/dmpfattribute4.jscdn.dmc.docomo.ne.jp/js/contents/dm... https://cdn.dmc.docomo.ne.jp/js/contents/dmpfattribute4.js — -1 — 0 B — 29 ms — https://analytics.google.com/g/collect?v=2&tid=G-2750JE9XQG&gtm=45je64h1v877796827z871471078za20gzb71471078zd71471078&_p=1776816088951&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=447595011.1776816090&frm=0&pscdl=noapi&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115938465~115938469~117266400~117512543~117884344~118463261&uid=&sid=1776816089&sct=1&seg=0&dl=https%3A%2F%2Fwww.ocn.ne.jp%2F&dt=OCN%E3%83%88%E3%83%83%E3%83%97%E3%83%9A%E3%83%BC%E3%82%B8&en=page_view&_fv=1&_nsi=1&_ss=1&ep.template=pc&ep.UserAgent=Mozilla%2F5.0%20(Macintosh%3B%20Intel%20Mac%20OS%20X%2010_15_7)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Safari%2F537.36&ep.top=1&ep.line_identify=undefined&ep.upnavi_status=close&ep.logintype=&up.USER_ID_FOR_GA=&up.login=0&up.da_cookie_id=&tfd=1949analytics.google.com/g/collect?v=2&... https://analytics.google.com/g/collect?v=2&tid=G-2750JE9XQG&gtm=45je64h1v877796827z871471078za20gzb71471078zd71471078&_p=1776816088951&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=447595011.1776816090&frm=0&pscdl=noapi&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115938465~115938469~117266400~117512543~117884344~118463261&uid=&sid=1776816089&sct=1&seg=0&dl=https%3A%2F%2Fwww.ocn.ne.jp%2F&dt=OCN%E3%83%88%E3%83%83%E3%83%97%E3%83%9A%E3%83%BC%E3%82%B8&en=page_view&_fv=1&_nsi=1&_ss=1&ep.template=pc&ep.UserAgent=Mozilla%2F5.0%20(Macintosh%3B%20Intel%20Mac%20OS%20X%2010_15_7)%20AppleWebKit%2F537.36%20(KHTML%2C%20like%20Gecko)%20Chrome%2F146.0.0.0%20Safari%2F537.36&ep.top=1&ep.line_identify=undefined&ep.upnavi_status=close&ep.logintype=&up.USER_ID_FOR_GA=&up.login=0&up.da_cookie_id=&tfd=1949 — 204 — 548 B — 75 ms — 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150.8 KiB — 69 ms — h3https://www.ocn.ne.jp/favicon.icowww.ocn.ne.jp/favicon.ico https://www.ocn.ne.jp/favicon.ico — 200 — 1.7 KiB — 10 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 820ms · 655KB · ¥1133/mo
www.ocn.ne.jp
Other
Costly
Execution 295ms
Transfer 32 KB
Monthly Cost ¥408/mo
Google Tag Manager
Tag Manager
Costly
Execution 140ms
Transfer 134 KB
Unused 45%
Monthly Cost ¥193/mo
Unattributable
Other
Costly
Execution 113ms
Transfer 0 KB
Monthly Cost ¥157/mo
Google Tag Manager
Tag Manager
Costly
Execution 77ms
Transfer 151 KB
Unused 43%
Monthly Cost ¥106/mo
Google Tag Manager
Tag Manager
Costly
Execution 66ms
Transfer 133 KB
Unused 48%
Monthly Cost ¥91/mo
www.ocn.ne.jp
Other
Costly
Execution 65ms
Transfer 55 KB
Monthly Cost ¥90/mo
Google Tag Manager
Tag Manager
Costly
Execution 64ms
Transfer 151 KB
Unused 50%
Monthly Cost ¥88/mo

These scripts may cost more than they're worth

  • www.ocn.ne.jp adds 295ms and costs ~¥408/month
  • Google Tag Manager adds 140ms and costs ~¥193/month
  • Unattributable adds 113ms and costs ~¥157/month
  • Google Tag Manager adds 77ms and costs ~¥106/month
  • Google Tag Manager adds 66ms and costs ~¥91/month
  • www.ocn.ne.jp adds 65ms and costs ~¥90/month
  • Google Tag Manager adds 64ms and costs ~¥88/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.ocn.ne.jp takes 295ms 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 140ms 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 113ms 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 77ms 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 66ms 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.ocn.ne.jp takes 65ms 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 64ms 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

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