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https://softbank.jp

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
2
PASS
7
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.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

2.39 s

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

8.30 s

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

3.06 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.

9.30 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.

26.58 s

Page Load Progression

797 ms
1.6 s
2.4 s
3.2 s
4.0 s
4.8 s
5.6 s
6.4 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
16.9 MB transferred, 128 requests
FIX
16.9 MB transferred, 128 requests
Critical::
Page weighs 21.7 MB (16.9 MB transferred)
Warning::
Images are 14.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 14.4 MB
Warning::
JavaScript is 2.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.4 MB
Warning::
128 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.5 g CO2 per page load
16.9 MB / 2.4 MB budget
16.9 MB transferred
128 requests
3.5 g CO2 per page load
Images 14.4 MiB 85%
JavaScript 2.4 MiB 14%
Other 119.2 KiB 1%
CSS 50.2 KiB 0%
HTML 12.6 KiB 0%
Other 1.2 KiB 0%
Other 547 B 0%
Other 0 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

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 (16.9 MiB of 16.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
16866ms total JS execution
FIX
16866ms total JS execution
Warning::
https://t.contentsquare.net/uxa/12bfe507f39ec.js: 5598ms CPU time
Warning::
https://www.softbank.jp/site/set/data/top/js/s/202...: 4181ms CPU time
Warning::
https://www.softbank.jp/: 1888ms CPU time
Warning::
Unattributable: 1212ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-BMS...: 1157ms CPU time
Warning::
Third-party scripts: 16866ms (100% of total)

Main Thread Breakdown

Script Evaluation 56% Other 21% Style & Layout 14% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://t.contentsquare.net/uxa/12bfe507f39ec.js5598ms5081ms72ms3rd
https://www.softbank.jp/site/set/data/top/js/s/2026/index.js4181ms1202ms21ms3rd
https://www.softbank.jp/1888ms7ms3ms3rd
Unattributable1212ms88ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-BMSW1157ms1029ms86ms3rd
https://www.googletagmanager.com/gtag/js?id=G-4MD1NXTN7F&cx=c&gtm=4e64h1323ms261ms60ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W6RH4KH&gtm=4e64h1317ms254ms58ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-54HJTVSQ&gtm=4e64h1306ms168ms79ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P8N6VWTZ&gtm=4e64h1288ms203ms82ms3rd
https://cdn.eu.heap-api.com/v5/heapjs-static/5.3.12/core/heap.js279ms238ms40ms3rd

Showing top 10 of 19 scripts

F
JS Bundles
Action
27 scripts, 1.0 MB unused
FIX
27 scripts, 1.0 MB unused
Warning::
https://creativesurvey-ent-prod-upload-contents.s3...: 332 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://t.contentsquare.net/uxa/12bfe507f39ec.js: 73 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TND...: 73 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-54H...: 71 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P8N...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.0 MB
1064 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://creativesurvey-ent-prod-upload-contents.s3.amazonaws.com/uploads/production/survin/script/23/survin.js625 KB332 KB (53%)✓3rd
https://t.contentsquare.net/uxa/12bfe507f39ec.js152 KB73 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TNDFTGNX&gtm=4e64h1173 KB73 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-54HJTVSQ&gtm=4e64h1172 KB71 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P8N6VWTZ&gtm=4e64h1175 KB70 KB (40%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MPWDW7WF&gtm=4e64h1116 KB69 KB (59%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MRJVDLW7&gtm=4e64h1169 KB67 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-4MD1NXTN7F&cx=c&gtm=4e64h1154 KB64 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-BMSW191 KB60 KB (31%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-W6RH4KH&gtm=4e64h1128 KB56 KB (44%)✓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

F
Page Weight Inventory
Action
128 resources · 16.9 MB · 1.0 MB savings available
FIX
128 resources · 16.9 MB · 1.0 MB savings available
Warning::
Page weight 15.9 MB over 1MB target
Got: 16.9 MB Expected: ≤ 1 MB
Info::
~1.0 MB of savings available
Warning::
127 third-party resources (100% of weight)
Info::
26 resources over 200KB
128 resources · 16.9 MiB · 127 third-party 15.9 MiB over 1MB target
Image 85% · 14.4 MiB
JavaScript 14% · 2.4 MiB
Other 1% · 117.4 KiB
CSS 0% · 50.2 KiB
Document 0% · 15.6 KiB

~1.0 MiB of savings available

Remove unused JavaScript: 1.0 MiB
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
Image Optimization
66 images, 0 KB saveable
REVIEW
66 images, 0 KB saveable
Warning::
https://www.softbank.jp/site/set/data/top/img/shar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
66 images 13.8 MB
0 oversized -0 KB
41 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
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
128 requests over 4206ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 2.4 s LCP 8.3 shttps://softbank.jp// https://softbank.jp/ — 302 — 121 B — 863 ms — http/1.1https://www.softbank.jp/www.softbank.jp/ https://www.softbank.jp/ — 200 — 11.2 KiB — 310 ms — h2https://www.softbank.jp/-/media/sb/sjp/scassets/system/common/js/include.jswww.softbank.jp/-/media/sb/sjp/scas... https://www.softbank.jp/-/media/sb/sjp/scassets/system/common/js/include.js — 200 — 1.0 KiB — 20 ms — h2https://www.softbank.jp/site/set/common/shared/css/reset/reset-v2.csswww.softbank.jp/site/set/common/sha... https://www.softbank.jp/site/set/common/shared/css/reset/reset-v2.css — 200 — 1.1 KiB — 33 ms — h2https://www.softbank.jp/site/set/common/info/v1/s/css/index.csswww.softbank.jp/site/set/common/inf... https://www.softbank.jp/site/set/common/info/v1/s/css/index.css — 200 — 15.2 KiB — 32 ms — h2https://www.softbank.jp/site/set/data/top/css/s/2026/index.csswww.softbank.jp/site/set/data/top/c... https://www.softbank.jp/site/set/data/top/css/s/2026/index.css — 200 — 27.0 KiB — 88 ms — h2https://www.softbank.jp/site/set/common/ticker/v3/s/css/index.csswww.softbank.jp/site/set/common/tic... https://www.softbank.jp/site/set/common/ticker/v3/s/css/index.css — 200 — 5.8 KiB — 88 ms — h2https://www.softbank.jp/site/set/data/top/css/s/2026/index.u96.csswww.softbank.jp/site/set/data/top/c... https://www.softbank.jp/site/set/data/top/css/s/2026/index.u96.css — 200 — 618 B — 86 ms — h2https://www.softbank.jp/site/set/data/top/css/shared/2026/index.u96.csswww.softbank.jp/site/set/data/top/c... https://www.softbank.jp/site/set/data/top/css/shared/2026/index.u96.css — 200 — 473 B — 17 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/2026/logo-sb-black.svgwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/2026/logo-sb-black.svg — 200 — 3.3 KiB — 118 ms — h2https://www.softbank.jp/site/set/common/disaster/v2/shared/js/index.jswww.softbank.jp/site/set/common/dis... https://www.softbank.jp/site/set/common/disaster/v2/shared/js/index.js — 200 — 3.1 KiB — 29 ms — h2https://www.softbank.jp/site/set/common/disaster/v2/shared/js/catastrophe.js?20250121www.softbank.jp/site/set/common/dis... https://www.softbank.jp/site/set/common/disaster/v2/shared/js/catastrophe.js?20250121 — 200 — 54.5 KiB — 16 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/2026/logo-sb-white.svgwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/2026/logo-sb-white.svg — 200 — 3.3 KiB — 15 ms — h2https://www.softbank.jp/site/set/common/shared/js/jquery-3.6.1.min.jswww.softbank.jp/site/set/common/sha... https://www.softbank.jp/site/set/common/shared/js/jquery-3.6.1.min.js — 200 — 39.3 KiB — 16 ms — h2https://www.softbank.jp/site/set/data/top/js/s/2026/index.jswww.softbank.jp/site/set/data/top/j... https://www.softbank.jp/site/set/data/top/js/s/2026/index.js — 200 — 64.6 KiB — 125 ms — h2https://www.softbank.jp/site/set/common/info/v1/shared/js/index.jswww.softbank.jp/site/set/common/inf... https://www.softbank.jp/site/set/common/info/v1/shared/js/index.js — 200 — 31.7 KiB — 31 ms — h2https://www.softbank.jp/site/set/data/top/js/s/2026/index.u96.jswww.softbank.jp/site/set/data/top/j... https://www.softbank.jp/site/set/data/top/js/s/2026/index.u96.js — 200 — 546 B — 40 ms — h2https://www.softbank.jp/site/set/data/top/js/shared/2026/index.u96.jswww.softbank.jp/site/set/data/top/j... https://www.softbank.jp/site/set/data/top/js/shared/2026/index.u96.js — 200 — 547 B — 41 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-line.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-line.webp — 200 — 2.1 KiB — 28 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-twitter.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-twitter.webp — 200 — 1.6 KiB — 29 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-facebook.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-facebook.webp — 200 — 1.7 KiB — 30 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-instagram.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-instagram.webp — 200 — 2.3 KiB — 125 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-youtube.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-youtube.webp — 200 — 1.6 KiB — 31 ms — h2https://www.softbank.jp/site/set/common/disaster/v2/shared/img/icon-attention.svgwww.softbank.jp/site/set/common/dis... https://www.softbank.jp/site/set/common/disaster/v2/shared/img/icon-attention.svg — 200 — 1.3 KiB — 129 ms — h2https://www.softbank.jp/scsystem/api/DisasterInformation/?www.softbank.jp/scsystem/api/Disast... https://www.softbank.jp/scsystem/api/DisasterInformation/? — 200 — 425 B — 770 ms — h2https://www.softbank.jp/scsystem/api/Importantnotices/?category=topwww.softbank.jp/scsystem/api/Import... https://www.softbank.jp/scsystem/api/Importantnotices/?category=top — 200 — 757 B — 335 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-BMSWwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-BMSW — 200 — 190.7 KiB — 98 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/2026/icon-mobile-worldmenu.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/2026/icon-mobile-worldmenu.webp — 200 — 1.3 KiB — 73 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/2026/icon-ymobile-worldmenu.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/2026/icon-ymobile-worldmenu.webp — 200 — 4.1 KiB — 76 ms — h2https://www.softbank.jp/site/set/common/p/img/icon-blank.svgwww.softbank.jp/site/set/common/p/i... https://www.softbank.jp/site/set/common/p/img/icon-blank.svg — 200 — 752 B — 126 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 2.4 s LCP 8.3 shttps://softbank.jp// https://softbank.jp/ — 302 — 121 B — 863 ms — http/1.1https://www.softbank.jp/www.softbank.jp/ https://www.softbank.jp/ — 200 — 11.2 KiB — 310 ms — h2https://www.softbank.jp/-/media/sb/sjp/scassets/system/common/js/include.jswww.softbank.jp/-/media/sb/sjp/scas... https://www.softbank.jp/-/media/sb/sjp/scassets/system/common/js/include.js — 200 — 1.0 KiB — 20 ms — h2https://www.softbank.jp/site/set/common/shared/css/reset/reset-v2.csswww.softbank.jp/site/set/common/sha... https://www.softbank.jp/site/set/common/shared/css/reset/reset-v2.css — 200 — 1.1 KiB — 33 ms — h2https://www.softbank.jp/site/set/common/info/v1/s/css/index.csswww.softbank.jp/site/set/common/inf... https://www.softbank.jp/site/set/common/info/v1/s/css/index.css — 200 — 15.2 KiB — 32 ms — h2https://www.softbank.jp/site/set/data/top/css/s/2026/index.csswww.softbank.jp/site/set/data/top/c... https://www.softbank.jp/site/set/data/top/css/s/2026/index.css — 200 — 27.0 KiB — 88 ms — h2https://www.softbank.jp/site/set/common/ticker/v3/s/css/index.csswww.softbank.jp/site/set/common/tic... https://www.softbank.jp/site/set/common/ticker/v3/s/css/index.css — 200 — 5.8 KiB — 88 ms — h2https://www.softbank.jp/site/set/data/top/css/s/2026/index.u96.csswww.softbank.jp/site/set/data/top/c... https://www.softbank.jp/site/set/data/top/css/s/2026/index.u96.css — 200 — 618 B — 86 ms — h2https://www.softbank.jp/site/set/data/top/css/shared/2026/index.u96.csswww.softbank.jp/site/set/data/top/c... https://www.softbank.jp/site/set/data/top/css/shared/2026/index.u96.css — 200 — 473 B — 17 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/2026/logo-sb-black.svgwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/2026/logo-sb-black.svg — 200 — 3.3 KiB — 118 ms — h2https://www.softbank.jp/site/set/common/disaster/v2/shared/js/index.jswww.softbank.jp/site/set/common/dis... https://www.softbank.jp/site/set/common/disaster/v2/shared/js/index.js — 200 — 3.1 KiB — 29 ms — h2https://www.softbank.jp/site/set/common/disaster/v2/shared/js/catastrophe.js?20250121www.softbank.jp/site/set/common/dis... https://www.softbank.jp/site/set/common/disaster/v2/shared/js/catastrophe.js?20250121 — 200 — 54.5 KiB — 16 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/2026/logo-sb-white.svgwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/2026/logo-sb-white.svg — 200 — 3.3 KiB — 15 ms — h2https://www.softbank.jp/site/set/common/shared/js/jquery-3.6.1.min.jswww.softbank.jp/site/set/common/sha... https://www.softbank.jp/site/set/common/shared/js/jquery-3.6.1.min.js — 200 — 39.3 KiB — 16 ms — h2https://www.softbank.jp/site/set/data/top/js/s/2026/index.jswww.softbank.jp/site/set/data/top/j... https://www.softbank.jp/site/set/data/top/js/s/2026/index.js — 200 — 64.6 KiB — 125 ms — h2https://www.softbank.jp/site/set/common/info/v1/shared/js/index.jswww.softbank.jp/site/set/common/inf... https://www.softbank.jp/site/set/common/info/v1/shared/js/index.js — 200 — 31.7 KiB — 31 ms — h2https://www.softbank.jp/site/set/data/top/js/s/2026/index.u96.jswww.softbank.jp/site/set/data/top/j... https://www.softbank.jp/site/set/data/top/js/s/2026/index.u96.js — 200 — 546 B — 40 ms — h2https://www.softbank.jp/site/set/data/top/js/shared/2026/index.u96.jswww.softbank.jp/site/set/data/top/j... https://www.softbank.jp/site/set/data/top/js/shared/2026/index.u96.js — 200 — 547 B — 41 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-line.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-line.webp — 200 — 2.1 KiB — 28 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-twitter.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-twitter.webp — 200 — 1.6 KiB — 29 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-facebook.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-facebook.webp — 200 — 1.7 KiB — 30 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-instagram.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-instagram.webp — 200 — 2.3 KiB — 125 ms — h2https://www.softbank.jp/site/set/data/top/img/shared/icon-social-youtube.webpwww.softbank.jp/site/set/data/top/i... https://www.softbank.jp/site/set/data/top/img/shared/icon-social-youtube.webp — 200 — 1.6 KiB — 31 ms — 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https://www.google-analytics.com/g/collect?v=2&tid=G-4MD1NXTN7F&gtm=45je64h1v894394885z8596333za20gzb596333zd596333&_p=1776817065816&gcd=13l3l3l3l1l1&npa=0&dma=0&_geo=1&_rdi=1&are=1&cid=1067575653.1776817067&frm=0&pscdl=noapi&rcb=12&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117512542&dl=https%3A%2F%2Fwww.softbank.jp%2F&sid=1776817066&sct=1&seg=0&dt=%E3%82%BD%E3%83%95%E3%83%88%E3%83%90%E3%83%B3%E3%82%AF&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=2433 — 204 — 550 B — 106 ms — h2https://cdn.treasuredata.com/sdk/3.1.4/td.min.jscdn.treasuredata.com/sdk/3.1.4/td.m... https://cdn.treasuredata.com/sdk/3.1.4/td.min.js — 200 — 20.3 KiB — 27 ms — http/1.1blob:https://www.softbank.jp/0f068326-46e1-48a1-9150-c83c6830d82dwww.softbank.jp/0f068326-46e1-48a1-... blob:https://www.softbank.jp/0f068326-46e1-48a1-9150-c83c6830d82d — 200 — -1 B — 121 ms — blobhttps://csxd.contentsquare.net/uxa/xdframe-single-domain-1.3.3.html?pid=4152csxd.contentsquare.net/uxa/xdframe-... https://csxd.contentsquare.net/uxa/xdframe-single-domain-1.3.3.html?pid=4152 — 200 — 1.4 KiB — 26 ms — h2https://cdn.us.heap-api.com/config/3618878549/heap_config.jscdn.us.heap-api.com/config/36188785... https://cdn.us.heap-api.com/config/3618878549/heap_config.js — 200 — 1.1 KiB — 29 ms — h2https://ssc.softbank.jp/get_cookie_id?cookie_domain=softbank.jp&r=1776817067804ssc.softbank.jp/get_cookie_id?cooki... https://ssc.softbank.jp/get_cookie_id?cookie_domain=softbank.jp&r=1776817067804 — 200 — 552 B — 233 ms — h2https://cdn.eu.heap-api.com/v5/heapjs-static/5.3.12/core/heap.jscdn.eu.heap-api.com/v5/heapjs-stati... https://cdn.eu.heap-api.com/v5/heapjs-static/5.3.12/core/heap.js — 200 — 75.1 KiB — 36 ms — h3https://c.contentsquare.net/pageview?cw=2&happid=3618878549&t=%E3%82%BD%E3%83%95%E3%83%88%E3%83%90%E3%83%B3%E3%82%AF&ex=&dt=93&pvt=n&la=en-US&uc=1&url=https%3A%2F%2Fwww.softbank.jp%2F&dr=&dw=412&dh=5685&ww=412&wh=823&sw=412&sh=823&uu=7465ce66-9be4-a0ff-eaae-542d91d11d9f&sn=1&hd=1776817068&v=15.211.0&pid=4152&pn=1&hsid=689998661191144&huu=6841695586029436&hpvid=8885663459079306&ct=0c.contentsquare.net/pageview?cw=2&h... https://c.contentsquare.net/pageview?cw=2&happid=3618878549&t=%E3%82%BD%E3%83%95%E3%83%88%E3%83%90%E3%83%B3%E3%82%AF&ex=&dt=93&pvt=n&la=en-US&uc=1&url=https%3A%2F%2Fwww.softbank.jp%2F&dr=&dw=412&dh=5685&ww=412&wh=823&sw=412&sh=823&uu=7465ce66-9be4-a0ff-eaae-542d91d11d9f&sn=1&hd=1776817068&v=15.211.0&pid=4152&pn=1&hsid=689998661191144&huu=6841695586029436&hpvid=8885663459079306&ct=0 — 204 — 272 B — 34 ms — h2https://static.hj.contentsquare.net/c/hotjar-6471157.jsstatic.hj.contentsquare.net/c/hotja... https://static.hj.contentsquare.net/c/hotjar-6471157.js — 200 — 6.2 KiB — 95 ms — h2https://c.eu.heap-api.com/api/capture/v2/add_user_propertiesc.eu.heap-api.com/api/capture/v2/ad... https://c.eu.heap-api.com/api/capture/v2/add_user_properties — 200 — 0 B — 256 ms — h2https://c.eu.heap-api.com/api/capture/v2/trackc.eu.heap-api.com/api/capture/v2/tr... https://c.eu.heap-api.com/api/capture/v2/track — 200 — 0 B — 256 ms — h2https://ap03.records.in.treasuredata.com/d0_tdtag/d_rawdata_all_1?modified=1776817068120ap03.records.in.treasuredata.com/d0... https://ap03.records.in.treasuredata.com/d0_tdtag/d_rawdata_all_1?modified=1776817068120 — -1 — 0 B — 537 ms — https://ap03.records.in.treasuredata.com/d0_tdtag/d_rawdata_all_1?modified=1776817068120ap03.records.in.treasuredata.com/d0... https://ap03.records.in.treasuredata.com/d0_tdtag/d_rawdata_all_1?modified=1776817068120 — 403 — 0 B — 532 ms — h2https://k-aeu1.contentsquare.net/v2/recording?rt=7&rst=1776817068099&let=1776817068150&v=15.211.0&pid=4152&pn=1&sn=1&uu=7465ce66-9be4-a0ff-eaae-542d91d11d9f&happid=3618878549&hsid=689998661191144&huu=6841695586029436&hpvid=8885663459079306&ri=1&ct=2k-aeu1.contentsquare.net/v2/recordi... https://k-aeu1.contentsquare.net/v2/recording?rt=7&rst=1776817068099&let=1776817068150&v=15.211.0&pid=4152&pn=1&sn=1&uu=7465ce66-9be4-a0ff-eaae-542d91d11d9f&happid=3618878549&hsid=689998661191144&huu=6841695586029436&hpvid=8885663459079306&ri=1&ct=2 — 200 — 183 B — 357 ms — h2https://c.eu.heap-api.com/api/capture/v2/add_user_propertiesc.eu.heap-api.com/api/capture/v2/ad... https://c.eu.heap-api.com/api/capture/v2/add_user_properties — 200 — 379 B — 83 ms — h2https://c.eu.heap-api.com/api/capture/v2/trackc.eu.heap-api.com/api/capture/v2/tr... https://c.eu.heap-api.com/api/capture/v2/track — 200 — 379 B — 85 ms — h2https://www.softbank.jp/site/set/common/p/img/favicon.icowww.softbank.jp/site/set/common/p/i... https://www.softbank.jp/site/set/common/p/img/favicon.ico — 200 — 426 B — 128 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 16866ms · 2367KB · ¥100/mo
t.contentsquare.net
Other
Costly
Execution 5598ms
Transfer 152 KB
Unused 48%
Monthly Cost ¥33/mo
www.softbank.jp
Other
Costly
Execution 4181ms
Transfer 65 KB
Unused 44%
Monthly Cost ¥25/mo
www.softbank.jp
Other
Costly
Execution 1888ms
Transfer 11 KB
Monthly Cost ¥11/mo
Unattributable
Other
Costly
Execution 1212ms
Transfer 0 KB
Monthly Cost ¥7/mo
Google Tag Manager
Tag Manager
Costly
Execution 1157ms
Transfer 191 KB
Unused 31%
Monthly Cost ¥7/mo
Google Tag Manager
Tag Manager
Costly
Execution 323ms
Transfer 154 KB
Unused 42%
Monthly Cost ¥2/mo
Google Tag Manager
Tag Manager
Costly
Execution 317ms
Transfer 128 KB
Unused 44%
Monthly Cost ¥2/mo
Google Tag Manager
Tag Manager
Costly
Execution 306ms
Transfer 172 KB
Unused 41%
Monthly Cost ¥2/mo
Google Tag Manager
Tag Manager
Costly
Execution 288ms
Transfer 175 KB
Unused 40%
Monthly Cost ¥2/mo
cdn.eu.heap-api.com
Other
Costly
Execution 279ms
Transfer 75 KB
Unused 39%
Monthly Cost ¥2/mo
Google Tag Manager
Tag Manager
Costly
Execution 262ms
Transfer 169 KB
Unused 40%
Monthly Cost ¥2/mo
creativesurvey-ent-prod-upload-contents.s3.amazonaws.com
Other
Costly
Execution 261ms
Transfer 625 KB
Unused 53%
Monthly Cost ¥2/mo
Google Tag Manager
Tag Manager
Costly
Execution 229ms
Transfer 173 KB
Unused 42%
Monthly Cost ¥1/mo
www.softbank.jp
Other
Optional
Execution 144ms
Transfer 54 KB
Unused 81%
Monthly Cost ¥1/mo
Google Tag Manager
Tag Manager
Optional
Execution 139ms
Transfer 116 KB
Unused 59%
Monthly Cost ¥1/mo
cdn-edge.karte.io
Other
Optional
Execution 90ms
Transfer 15 KB
Monthly Cost ¥1/mo
www.softbank.jp
Other
Optional
Execution 85ms
Transfer 32 KB
Monthly Cost ¥0/mo
www.softbank.jp
Other
Optional
Execution 57ms
Transfer 39 KB
Unused 72%
Monthly Cost ¥0/mo
cdn.treasuredata.com
Other
Optional
Execution 52ms
Transfer 20 KB
Monthly Cost ¥0/mo

These scripts may cost more than they're worth

  • t.contentsquare.net adds 5598ms and costs ~¥33/month
  • www.softbank.jp adds 4181ms and costs ~¥25/month
  • www.softbank.jp adds 1888ms and costs ~¥11/month
  • Unattributable adds 1212ms and costs ~¥7/month
  • Google Tag Manager adds 1157ms and costs ~¥7/month
  • Google Tag Manager adds 323ms and costs ~¥2/month
  • Google Tag Manager adds 317ms and costs ~¥2/month
  • Google Tag Manager adds 306ms and costs ~¥2/month
  • Google Tag Manager adds 288ms and costs ~¥2/month
  • cdn.eu.heap-api.com adds 279ms and costs ~¥2/month
  • Google Tag Manager adds 262ms and costs ~¥2/month
  • creativesurvey-ent-prod-upload-contents.s3.amazonaws.com adds 261ms and costs ~¥2/month
  • Google Tag Manager adds 229ms 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

t.contentsquare.net takes 5598ms 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.softbank.jp takes 4181ms 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.softbank.jp takes 1888ms 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 1212ms 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 1157ms 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 323ms 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 317ms 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 306ms 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 288ms 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

cdn.eu.heap-api.com takes 279ms 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 262ms 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

creativesurvey-ent-prod-upload-contents.s3.amazonaws.com takes 261ms 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

53% of creativesurvey-ent-prod-upload-contents.s3.amazonaws.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 229ms 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

81% of www.softbank.jp'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

59% 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

72% of www.softbank.jp'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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