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https://nikkeibp.co.jp

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
87
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.31 s

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

1.33 s

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

22 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.

2.55 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.

2.59 s

Page Load Progression

722 ms
1.4 s
2.2 s
2.9 s
3.6 s
4.3 s
5.1 s
5.8 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
11.9 MB transferred, 68 requests
FIX
11.9 MB transferred, 68 requests
Critical::
Page weighs 12.9 MB (11.9 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Warning::
JavaScript is 728 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 728 KB
Info::
68 HTTP requests
Info::
Estimated 2.5 g CO2 per page load
11.9 MB / 2.4 MB budget
11.9 MB transferred
68 requests
2.5 g CO2 per page load
Other 10.0 MiB 84%
Images 1.1 MiB 9%
JavaScript 728.2 KiB 6%
CSS 42.7 KiB 0%
Other 19.2 KiB 0%
HTML 16.2 KiB 0%
Fonts 15.1 KiB 0%
Other 2.2 KiB 0%
Other 1.4 KiB 0%
Other 1.4 KiB 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 (11.9 MiB of 11.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
68 resources · 11.9 MB · 248 KB savings available
FIX
68 resources · 11.9 MB · 248 KB savings available
Warning::
Page weight 10.9 MB over 1MB target
Got: 11.9 MB Expected: ≤ 1 MB
Info::
~248 KB of savings available
Warning::
67 third-party resources (100% of weight)
Info::
2 resources over 200KB
68 resources · 11.9 MiB · 67 third-party 10.9 MiB over 1MB target
Media 84% · 10.0 MiB
Image 9% · 1.1 MiB
JavaScript 6% · 728.2 KiB
CSS 0% · 42.7 KiB
Document 0% · 16.3 KiB
Font 0% · 15.1 KiB
Other 0% · 6.8 KiB

~248.3 KiB of savings available

Remove unused JavaScript: 248.3 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
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/bplogo/logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nikkeibp.co.jp/images/www/2018/index/b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 1.1 MB
0 oversized -0 KB
30 legacy format
12 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

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

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
922ms total JS execution
REVIEW
922ms total JS execution
Warning::
https://www.nikkeibp.co.jp/: 280ms CPU time
Info::
Unattributable: 238ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-PM8F...: 96ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-N67...: 93ms CPU time
Info::
https://www.nikkeibp.co.jp/js/bpcommon/jquery-1.x....: 61ms CPU time
Warning::
Third-party scripts: 922ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 29% Style & Layout 17% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.nikkeibp.co.jp/280ms43ms0ms3rd
Unattributable238ms17ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PM8FXLP65G&cx=c&gtm=4e64h196ms76ms19ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N67TT5M93ms70ms18ms3rd
https://www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.js61ms31ms4ms3rd
https://img.ak.impact-ad.jp/ut/a1/tracking.min.js52ms40ms9ms3rd
https://cdn.cxense.com/cx.js52ms42ms6ms3rd
https://connect.facebook.net/en_US/fbevents.js51ms38ms13ms3rd
C
JS Bundles
Action
20 scripts, 248 KB unused
REVIEW
20 scripts, 248 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PM8F...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N67...: 63 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nikkeibp.co.jp/js/bpcommon/jquery-1.x....: 49 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.nikkeibp.co.jp/js/www/2018/slick.min.j...: 38 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 35 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 248 KB
248 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-PM8FXLP65G&cx=c&gtm=4e64h1152 KB64 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N67TT5M143 KB63 KB (44%)✓3rd
https://www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.js95 KB49 KB (51%)✓3rd
https://www.nikkeibp.co.jp/js/www/2018/slick.min.js?2020082641 KB38 KB (92%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB35 KB (36%)✓3rd
https://img.ak.impact-ad.jp/ut/f9647ca0f4a5e33f_3739.js6 KB—✓3rd
https://cdn.cxense.com/cx.cce.js7 KB—✓3rd
https://www.nikkeibp.co.jp/js/bpcommon/onetag/bpTrackVars.js1 KB—✓3rd
https://www.nikkeibp.co.jp/js/www/2018/index.js?202008264 KB—✓3rd
https://www.nikkeibp.co.jp/js/www/2018/form.js?201812121 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

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
1 fonts (15 KB)
PASS
1 fonts (15 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

15 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 1.3 s LCP 1.3 shttps://www.nikkeibp.co.jp/css/www/2018/font/oswald-v16-latin-regular.woff2oswald-v16-latin-regula... https://www.nikkeibp.co.jp/css/www/2018/font/oswald-v16-latin-regular.woff2 — 15.1 KiB — 90 ms — font-display: swap
oswald-v16-latin-regula... woff2 swap
Size 15 KB
Load time 90 ms
Start 918 ms
Risk FOUT — text flashes from fallback to web font
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)
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
68 requests over 3482ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.3 s LCP 1.3 shttps://nikkeibp.co.jp// https://nikkeibp.co.jp/ — 301 — 103 B — 219 ms — h2https://www.nikkeibp.co.jp/www.nikkeibp.co.jp/ https://www.nikkeibp.co.jp/ — 200 — 15.4 KiB — 284 ms — h2https://www.nikkeibp.co.jp/css/www/2018/font.csswww.nikkeibp.co.jp/css/www/2018/fon... https://www.nikkeibp.co.jp/css/www/2018/font.css — 200 — 601 B — 77 ms — h2https://www.nikkeibp.co.jp/css/www/2018/common.css?20231122www.nikkeibp.co.jp/css/www/2018/com... https://www.nikkeibp.co.jp/css/www/2018/common.css?20231122 — 200 — 17.9 KiB — 78 ms — h2https://www.nikkeibp.co.jp/css/www/2018/index.css?251020www.nikkeibp.co.jp/css/www/2018/ind... https://www.nikkeibp.co.jp/css/www/2018/index.css?251020 — 200 — 24.2 KiB — 145 ms — h2https://www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.jswww.nikkeibp.co.jp/js/bpcommon/jque... https://www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.js — 200 — 95.3 KiB — 221 ms — h2https://www.nikkeibp.co.jp/js/www/2018/jquery.matchHeight-min.jswww.nikkeibp.co.jp/js/www/2018/jque... https://www.nikkeibp.co.jp/js/www/2018/jquery.matchHeight-min.js — 200 — 3.5 KiB — 78 ms — h2https://www.nikkeibp.co.jp/js/www/2018/common.js?20200121www.nikkeibp.co.jp/js/www/2018/comm... https://www.nikkeibp.co.jp/js/www/2018/common.js?20200121 — 200 — 2.4 KiB — 220 ms — h2https://www.nikkeibp.co.jp/js/www/2018/form.js?20181212www.nikkeibp.co.jp/js/www/2018/form... https://www.nikkeibp.co.jp/js/www/2018/form.js?20181212 — 200 — 1.3 KiB — 219 ms — h2https://www.nikkeibp.co.jp/js/www/2018/slick.min.js?20200826www.nikkeibp.co.jp/js/www/2018/slic... https://www.nikkeibp.co.jp/js/www/2018/slick.min.js?20200826 — 200 — 41.2 KiB — 218 ms — h2https://www.nikkeibp.co.jp/js/www/2018/index.js?20200826www.nikkeibp.co.jp/js/www/2018/inde... https://www.nikkeibp.co.jp/js/www/2018/index.js?20200826 — 200 — 3.5 KiB — 219 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/ico-services_01.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/ico-services_01.png — 200 — 7.2 KiB — 77 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/ico-services_02.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/ico-services_02.png — 200 — 6.6 KiB — 219 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/ico-services_03.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/ico-services_03.png — 200 — 3.8 KiB — 141 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/ico-services_04.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/ico-services_04.png — 200 — 12.6 KiB — 74 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_01.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_01.png — 200 — 6.2 KiB — 75 ms — h2https://www.nikkeibp.co.jp/js/bpcommon/onetag/bpTrackVarsCommon.jswww.nikkeibp.co.jp/js/bpcommon/onet... https://www.nikkeibp.co.jp/js/bpcommon/onetag/bpTrackVarsCommon.js — 200 — 2.6 KiB — 85 ms — h2https://www.nikkeibp.co.jp/js/bpcommon/onetag/bpTrackVars.jswww.nikkeibp.co.jp/js/bpcommon/onet... https://www.nikkeibp.co.jp/js/bpcommon/onetag/bpTrackVars.js — 200 — 643 B — 88 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_02.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_02.png — 200 — 5.5 KiB — 83 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_03.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_03.png — 200 — 5.8 KiB — 89 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_04.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_04.png — 200 — 5.9 KiB — 279 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_05.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_05.png — 200 — 6.3 KiB — 175 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_06_2.pngwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/bnr-data_06_2.png — 200 — 8.9 KiB — 276 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/bnr-recruit_01.jpg?230118www.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/bnr-recruit_01.jpg?230118 — 200 — 55.8 KiB — 175 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/bnr-recruit_02.jpg?230118www.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/bnr-recruit_02.jpg?230118 — 200 — 42.5 KiB — 85 ms — h2https://www.nikkeibp.co.jp/images/bplogo/logo.svgwww.nikkeibp.co.jp/images/bplogo/lo... https://www.nikkeibp.co.jp/images/bplogo/logo.svg — 200 — 2.0 KiB — 175 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-N67TT5Mwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-N67TT5M — 200 — 143.4 KiB — 48 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/img-main-title_02.svgwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/img-main-title_02.svg — 200 — 7.1 KiB — 174 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/img-main-title_03.svgwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/img-main-title_03.svg — 200 — 7.4 KiB — 87 ms — h2https://www.nikkeibp.co.jp/images/www/2018/index/log-main_01.svgwww.nikkeibp.co.jp/images/www/2018/... https://www.nikkeibp.co.jp/images/www/2018/index/log-main_01.svg — 200 — 2.1 KiB — 860 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 1.3 s LCP 1.3 shttps://nikkeibp.co.jp// https://nikkeibp.co.jp/ — 301 — 103 B — 219 ms — h2https://www.nikkeibp.co.jp/www.nikkeibp.co.jp/ https://www.nikkeibp.co.jp/ — 200 — 15.4 KiB — 284 ms — h2https://www.nikkeibp.co.jp/css/www/2018/font.csswww.nikkeibp.co.jp/css/www/2018/fon... https://www.nikkeibp.co.jp/css/www/2018/font.css — 200 — 601 B — 77 ms — h2https://www.nikkeibp.co.jp/css/www/2018/common.css?20231122www.nikkeibp.co.jp/css/www/2018/com... https://www.nikkeibp.co.jp/css/www/2018/common.css?20231122 — 200 — 17.9 KiB — 78 ms — h2https://www.nikkeibp.co.jp/css/www/2018/index.css?251020www.nikkeibp.co.jp/css/www/2018/ind... https://www.nikkeibp.co.jp/css/www/2018/index.css?251020 — 200 — 24.2 KiB — 145 ms — h2https://www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.jswww.nikkeibp.co.jp/js/bpcommon/jque... https://www.nikkeibp.co.jp/js/bpcommon/jquery-1.x.min.js — 200 — 95.3 KiB — 221 ms — h2https://www.nikkeibp.co.jp/js/www/2018/jquery.matchHeight-min.jswww.nikkeibp.co.jp/js/www/2018/jque... https://www.nikkeibp.co.jp/js/www/2018/jquery.matchHeight-min.js — 200 — 3.5 KiB — 78 ms — h2https://www.nikkeibp.co.jp/js/www/2018/common.js?20200121www.nikkeibp.co.jp/js/www/2018/comm... https://www.nikkeibp.co.jp/js/www/2018/common.js?20200121 — 200 — 2.4 KiB — 220 ms — h2https://www.nikkeibp.co.jp/js/www/2018/form.js?20181212www.nikkeibp.co.jp/js/www/2018/form... https://www.nikkeibp.co.jp/js/www/2018/form.js?20181212 — 200 — 1.3 KiB — 219 ms — h2https://www.nikkeibp.co.jp/js/www/2018/slick.min.js?20200826www.nikkeibp.co.jp/js/www/2018/slic... https://www.nikkeibp.co.jp/js/www/2018/slick.min.js?20200826 — 200 — 41.2 KiB — 218 ms — h2https://www.nikkeibp.co.jp/js/www/2018/index.js?20200826www.nikkeibp.co.jp/js/www/2018/inde... https://www.nikkeibp.co.jp/js/www/2018/index.js?20200826 — 200 — 3.5 KiB — 219 ms — 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— 200 — 201 B — 409 ms — h3https://id5-sync.com/bounceid5-sync.com/bounce https://id5-sync.com/bounce — 200 — 527 B — 474 ms — h2https://lb.eu-1-id5-sync.com/lb/v1lb.eu-1-id5-sync.com/lb/v1 https://lb.eu-1-id5-sync.com/lb/v1 — 200 — 337 B — 472 ms — h2https://id5-sync.com/gm/v3id5-sync.com/gm/v3 https://id5-sync.com/gm/v3 — 200 — 2.2 KiB — 158 ms — 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— 303 — 1.8 KiB — 62 ms — h2https://comcluster.cxense.com/Repo/rep.gif?ver=3.3.0&typ=pgv&rnd=mo98fn9mhhcqc77h&sid=1132872310191819444&loc=https%3A%2F%2Fwww.nikkeibp.co.jp%2F&new=1&arf=0&ltm=1776812748688&ref=&tzo=0&wsz=1350x940&res=800x600&dpr=1&col=24&bln=en-US&chs=UTF-8&cks=mo98fnatj5xfji9s&ckp=mo98fn9n9yfnlfdd&glb=&cp_userState=anon&cp_hour=23&cp_wday=Tue&cp_userStatus=&cp_testGroup=68&cst=s3753ge4ofps3jkhrv63690wlcomcluster.cxense.com/Repo/rep.gif?... https://comcluster.cxense.com/Repo/rep.gif?ver=3.3.0&typ=pgv&rnd=mo98fn9mhhcqc77h&sid=1132872310191819444&loc=https%3A%2F%2Fwww.nikkeibp.co.jp%2F&new=1&arf=0&ltm=1776812748688&ref=&tzo=0&wsz=1350x940&res=800x600&dpr=1&col=24&bln=en-US&chs=UTF-8&cks=mo98fnatj5xfji9s&ckp=mo98fn9n9yfnlfdd&glb=&cp_userState=anon&cp_hour=23&cp_wday=Tue&cp_userStatus=&cp_testGroup=68&cst=s3753ge4ofps3jkhrv63690wl — 200 — 413 B — 100 ms — 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h2https://penta.a.one.impact-ad.jp/ul_cb/combo?oid=f9647ca0f4a5e33f&dd_rft=k&dd_jsonp=a1tracker.cb._10&fu=85dc2065-f1c9-4981-beac-91b15dcc9b82&i5=ID5*3isoXBUP2VKrjbNuqbznHp-Hp8XMHp4wdn6S24jXy6H__2noAs1aAAEBCmnoAs0AojdBNUinPXLOCRm3ZWtYLA&dl=https%3A%2F%2Fwww.nikkeibp.co.jp%2F&src=https%3A%2F%2Fwww.nikkeibp.co.jp%2F%3Fa1_theme%3Dwww&l=en-us&sr=800x600&vp=1350x940&cd=24-bit&tgsrc=a1custom_nbp&dsc=%E6%97%A5%E7%B5%8CBP%E3%81%AF%E6%97%A5%E6%9C%AC%E7%B5%8C%E6%B8%88%E6%96%B0%E8%81%9E%E3%82%B0%E3%83%AB%E3%83%BC%E3%83%97%E3%81%AE%E4%B8%80%E5%93%A1%E3%81%A8%E3%81%97%E3%81%A6%E3%80%81%E7%B5%8C%E5%96%B6%E3%83%BB%E6%8A%80%E8%A1%93%E3%83%BB%E7%94%9F%E6%B4%BB%E3%81%A8%E3%81%84%E3%81%863%E5%88%86%E9%87%8E%E3%81%A7%E4%B8%BB%E3%81%AB%E3%83%93%E3%82%B8%E3%83%8D%E3%82%B9%E3%83%91%E3%83%BC%E3%82%BD%E3%83%B3%E3%81%AB%E5%90%91%E3%81%91%E3%81%A6%E4%BA%8B%E6%A5%AD%E3%82%92%E5%B1%95%E9%96%8B%E3%81%97%E3%81%A6%E3%81%84%E3%81%BE%E3%81%99%E3%80%82%E3%81%9D%E3%81%AE%E5%86%85%E5%AE%B9%E3%81%AF%E3%80%81%E9%9B%91%E8%AA%8C%E3%83%BB%E6%9B%B8%E7%B1%8D%E3%81%AE%E5%87%BA%E7%89%88%E4%BA%8B%E6%A5%AD%E3%80%81%E3%83%87%E3%82%B8%E3%82%BF%E3%83%AB%E4%BA%8B%E6%A5%AD%E3%80%81%E5%B1%95%E7%A4%BA%E4%BC%9A%E3%83%BB%E3%82%BB%E3%83%9F%E3%83%8A%E3%83%BC%E3%81%AA%E3%81%A9%E3%81%AE%E3%82%A4%E3%83%99%E3%83%B3%E3%83%88%E4%BA%8B%E6%A5%AD%E3%80%81%E8%AA%BF%E6%9F%BB%E3%83%BB%E3%82%B3%E3%83%B3%E3%82%B5%E3%83%AB%E3%83%86%E3%82%A3%E3%83%B3%E3%82%B0%E4%BA%8B%E6%A5%AD%E3%81%AA%E3%81%A9%E3%80%81%E5%A4%9A%E7%A8%AE%E5%A4%9A%E5%BD%A9%E3%81%AA%E3%83%A1%E3%83%87%E3%82%A3%E3%82%A2%E3%81%A8%E3%82%B5%E3%83%BC%E3%83%93%E3%82%B9%E3%82%92%E9%A7%86%E4%BD%BF%E3%81%97%E3%81%A6%E3%80%81%E9%AB%98%E4%BB%98%E5%8A%A0%E4%BE%A1%E5%80%A4%E3%81%AE%E5%85%88%E7%AB%AF%E3%83%BB%E5%B0%82%E9%96%80%E6%83%85%E5%A0%B1%E3%82%92%E6%8F%90%E4%BE%9B%E3%81%97%E3%81%A6%E3%81%84%E3%81%BE%E3%81%99%E3%80%82&dt=%E6%97%A5%E7%B5%8CBPpenta.a.one.impact-ad.jp/ul_cb/comb... https://penta.a.one.impact-ad.jp/ul_cb/combo?oid=f9647ca0f4a5e33f&dd_rft=k&dd_jsonp=a1tracker.cb._10&fu=85dc2065-f1c9-4981-beac-91b15dcc9b82&i5=ID5*3isoXBUP2VKrjbNuqbznHp-Hp8XMHp4wdn6S24jXy6H__2noAs1aAAEBCmnoAs0AojdBNUinPXLOCRm3ZWtYLA&dl=https%3A%2F%2Fwww.nikkeibp.co.jp%2F&src=https%3A%2F%2Fwww.nikkeibp.co.jp%2F%3Fa1_theme%3Dwww&l=en-us&sr=800x600&vp=1350x940&cd=24-bit&tgsrc=a1custom_nbp&dsc=%E6%97%A5%E7%B5%8CBP%E3%81%AF%E6%97%A5%E6%9C%AC%E7%B5%8C%E6%B8%88%E6%96%B0%E8%81%9E%E3%82%B0%E3%83%AB%E3%83%BC%E3%83%97%E3%81%AE%E4%B8%80%E5%93%A1%E3%81%A8%E3%81%97%E3%81%A6%E3%80%81%E7%B5%8C%E5%96%B6%E3%83%BB%E6%8A%80%E8%A1%93%E3%83%BB%E7%94%9F%E6%B4%BB%E3%81%A8%E3%81%84%E3%81%863%E5%88%86%E9%87%8E%E3%81%A7%E4%B8%BB%E3%81%AB%E3%83%93%E3%82%B8%E3%83%8D%E3%82%B9%E3%83%91%E3%83%BC%E3%82%BD%E3%83%B3%E3%81%AB%E5%90%91%E3%81%91%E3%81%A6%E4%BA%8B%E6%A5%AD%E3%82%92%E5%B1%95%E9%96%8B%E3%81%97%E3%81%A6%E3%81%84%E3%81%BE%E3%81%99%E3%80%82%E3%81%9D%E3%81%AE%E5%86%85%E5%AE%B9%E3%81%AF%E3%80%81%E9%9B%91%E8%AA%8C%E3%83%BB%E6%9B%B8%E7%B1%8D%E3%81%AE%E5%87%BA%E7%89%88%E4%BA%8B%E6%A5%AD%E3%80%81%E3%83%87%E3%82%B8%E3%82%BF%E3%83%AB%E4%BA%8B%E6%A5%AD%E3%80%81%E5%B1%95%E7%A4%BA%E4%BC%9A%E3%83%BB%E3%82%BB%E3%83%9F%E3%83%8A%E3%83%BC%E3%81%AA%E3%81%A9%E3%81%AE%E3%82%A4%E3%83%99%E3%83%B3%E3%83%88%E4%BA%8B%E6%A5%AD%E3%80%81%E8%AA%BF%E6%9F%BB%E3%83%BB%E3%82%B3%E3%83%B3%E3%82%B5%E3%83%AB%E3%83%86%E3%82%A3%E3%83%B3%E3%82%B0%E4%BA%8B%E6%A5%AD%E3%81%AA%E3%81%A9%E3%80%81%E5%A4%9A%E7%A8%AE%E5%A4%9A%E5%BD%A9%E3%81%AA%E3%83%A1%E3%83%87%E3%82%A3%E3%82%A2%E3%81%A8%E3%82%B5%E3%83%BC%E3%83%93%E3%82%B9%E3%82%92%E9%A7%86%E4%BD%BF%E3%81%97%E3%81%A6%E3%80%81%E9%AB%98%E4%BB%98%E5%8A%A0%E4%BE%A1%E5%80%A4%E3%81%AE%E5%85%88%E7%AB%AF%E3%83%BB%E5%B0%82%E9%96%80%E6%83%85%E5%A0%B1%E3%82%92%E6%8F%90%E4%BE%9B%E3%81%97%E3%81%A6%E3%81%84%E3%81%BE%E3%81%99%E3%80%82&dt=%E6%97%A5%E7%B5%8CBP — 200 — 235 B — 49 ms — h2https://aw.dw.impact-ad.jp/ut/rep?u=3739&v=5&r=https%3A%2F%2Fwww.nikkeibp.co.jp%2F&t=2012&fu=85dc2065-f1c9-4981-beac-91b15dcc9b82aw.dw.impact-ad.jp/ut/rep?u=3739&v=... https://aw.dw.impact-ad.jp/ut/rep?u=3739&v=5&r=https%3A%2F%2Fwww.nikkeibp.co.jp%2F&t=2012&fu=85dc2065-f1c9-4981-beac-91b15dcc9b82 — 200 — 235 B — 100 ms — h2https://www.nikkeibp.co.jp/favicon.icowww.nikkeibp.co.jp/favicon.ico https://www.nikkeibp.co.jp/favicon.ico — 200 — 17.3 KiB — 91 ms — h2https://astat.nikkeibp.co.jp/ATJ-2.16.9/1776812750666/19db24aee5e.ehk9e414rm05312dkdsr/1/ingest?k=78f152e5995154436289c30dd94b7801&a=scroll&c=page&aqe=%&d=%7B%22user%w%22user_id%y%xuser_status%y%xsite_session%vnull%ucustom_object%w%7D%uexternal_ids%w%7D%utimezone%v0%utimestamp%y2026-04-21T23%3A05%3A50.666Z%xviewport_height%v940%uviewport_width%v1350%uscreen_height%v600%uscreen_width%v800%ulayout%yunknown%zcontext%w%22app%vnull%uapp_version%vnull%usource%vnull%uedition%y%xcontent_id%y00008QVF%xcontent_name%vnull%ucontent_status%yopened%xpage_name%ybpindex%xpage_num%v1%ucategory_l1%yWWW%xcategory_l2%y%E6%97%A5%E7%B5%8CBP%xcategory_l3%y%E6%97%A5%E7%B5%8CBP%xtracking_code%y%xevents%vnull%ucustom_object%w%7D%ufunnel%w%7D%uroot_id%y19db24aee5e.ehk9e414rm05312dkdsr%xpage_title%y%E6%97%A5%E7%B5%8CBP%xurl%yhttps%3A%2F%2Fwww.nikkeibp.co.jp%2F%xreferrer%y%xproduct_family%ywww%xproduct%yCorp%xvisibility%yvisible%xnavigation_timing%w%22unload%v0%uredirect%v0%udns%v6%utcp%v139%urequest%v136%uresponse%v2%udom%v461%udomContent%v26%uonload%v0%uuntilResponseComplete%v507%uuntilDomComplete%v973%7D%unavigation_type%w%22type%v0%uredirectCount%v0%7D%uparent_content_name%y%xtheme_id%ywww%xaggregate_id%ywww-corp%xauthor_name%y%xpublish_date%y%xcontent_genre%y%xcontent_tags%ywww%xcontent_auth_kind%yFREE%xtotal_page_num%v0%uinternal_tracking_code%y%xtieup_id%y%xtieup_id_raw%y%xrep_tieup_id_raw%y%xpurchase%w%22name%y%xid%y%xprice%y%xcount%y%xpurchaseId%y%xprodView%y%xscView%y%xscCheckout%y%xpurchase%y%xaddCart%y%xdeleteCart%y%zsection_id%y%xccate_id%y%xcontent_auth_kind_raw%yFREE%xchecked_by%y%xeditor%y%xcategorized_theme_id%y%xsearch%w%22tags%y%xkeywords%y%zscroll_depth%w%22page_height%v5309%uviewed_until%v940%uviewed_percent%v20%uelapsed_since_page_load%v2.145%uelapsed_since_prev_action%v2.143%tastat.nikkeibp.co.jp/ATJ-2.16.9/177... https://astat.nikkeibp.co.jp/ATJ-2.16.9/1776812750666/19db24aee5e.ehk9e414rm05312dkdsr/1/ingest?k=78f152e5995154436289c30dd94b7801&a=scroll&c=page&aqe=%&d=%7B%22user%w%22user_id%y%xuser_status%y%xsite_session%vnull%ucustom_object%w%7D%uexternal_ids%w%7D%utimezone%v0%utimestamp%y2026-04-21T23%3A05%3A50.666Z%xviewport_height%v940%uviewport_width%v1350%uscreen_height%v600%uscreen_width%v800%ulayout%yunknown%zcontext%w%22app%vnull%uapp_version%vnull%usource%vnull%uedition%y%xcontent_id%y00008QVF%xcontent_name%vnull%ucontent_status%yopened%xpage_name%ybpindex%xpage_num%v1%ucategory_l1%yWWW%xcategory_l2%y%E6%97%A5%E7%B5%8CBP%xcategory_l3%y%E6%97%A5%E7%B5%8CBP%xtracking_code%y%xevents%vnull%ucustom_object%w%7D%ufunnel%w%7D%uroot_id%y19db24aee5e.ehk9e414rm05312dkdsr%xpage_title%y%E6%97%A5%E7%B5%8CBP%xurl%yhttps%3A%2F%2Fwww.nikkeibp.co.jp%2F%xreferrer%y%xproduct_family%ywww%xproduct%yCorp%xvisibility%yvisible%xnavigation_timing%w%22unload%v0%uredirect%v0%udns%v6%utcp%v139%urequest%v136%uresponse%v2%udom%v461%udomContent%v26%uonload%v0%uuntilResponseComplete%v507%uuntilDomComplete%v973%7D%unavigation_type%w%22type%v0%uredirectCount%v0%7D%uparent_content_name%y%xtheme_id%ywww%xaggregate_id%ywww-corp%xauthor_name%y%xpublish_date%y%xcontent_genre%y%xcontent_tags%ywww%xcontent_auth_kind%yFREE%xtotal_page_num%v0%uinternal_tracking_code%y%xtieup_id%y%xtieup_id_raw%y%xrep_tieup_id_raw%y%xpurchase%w%22name%y%xid%y%xprice%y%xcount%y%xpurchaseId%y%xprodView%y%xscView%y%xscCheckout%y%xpurchase%y%xaddCart%y%xdeleteCart%y%zsection_id%y%xccate_id%y%xcontent_auth_kind_raw%yFREE%xchecked_by%y%xeditor%y%xcategorized_theme_id%y%xsearch%w%22tags%y%xkeywords%y%zscroll_depth%w%22page_height%v5309%uviewed_until%v940%uviewed_percent%v20%uelapsed_since_page_load%v2.145%uelapsed_since_prev_action%v2.143%t — 204 — 302 B — 77 ms — h2https://astat.nikkeibp.co.jp/ATJ-2.16.9/1776812750668/19db24aee5e.ehk9e414rm05312dkdsr/1/ingest?k=78f152e5995154436289c30dd94b7801&a=infinity_scroll&c=page&aqe=%&d=%7B%22user%w%22user_id%y%xuser_status%y%xsite_session%vnull%ucustom_object%w%7D%uexternal_ids%w%7D%utimezone%v0%utimestamp%y2026-04-21T23%3A05%3A50.668Z%xviewport_height%v940%uviewport_width%v1350%uscreen_height%v600%uscreen_width%v800%ulayout%yunknown%zcontext%w%22app%vnull%uapp_version%vnull%usource%vnull%uedition%y%xcontent_id%y00008QVF%xcontent_name%vnull%ucontent_status%yopened%xpage_name%ybpindex%xpage_num%v1%ucategory_l1%yWWW%xcategory_l2%y%E6%97%A5%E7%B5%8CBP%xcategory_l3%y%E6%97%A5%E7%B5%8CBP%xtracking_code%y%xevents%vnull%ucustom_object%w%7D%ufunnel%w%7D%uroot_id%y19db24aee5e.ehk9e414rm05312dkdsr%xpage_title%y%E6%97%A5%E7%B5%8CBP%xurl%yhttps%3A%2F%2Fwww.nikkeibp.co.jp%2F%xreferrer%y%xproduct_family%ywww%xproduct%yCorp%xvisibility%yvisible%xnavigation_timing%w%22unload%v0%uredirect%v0%udns%v6%utcp%v139%urequest%v136%uresponse%v2%udom%v461%udomContent%v26%uonload%v0%uuntilResponseComplete%v507%uuntilDomComplete%v973%7D%unavigation_type%w%22type%v0%uredirectCount%v0%7D%uparent_content_name%y%xtheme_id%ywww%xaggregate_id%ywww-corp%xauthor_name%y%xpublish_date%y%xcontent_genre%y%xcontent_tags%ywww%xcontent_auth_kind%yFREE%xtotal_page_num%v0%uinternal_tracking_code%y%xtieup_id%y%xtieup_id_raw%y%xrep_tieup_id_raw%y%xpurchase%w%22name%y%xid%y%xprice%y%xcount%y%xpurchaseId%y%xprodView%y%xscView%y%xscCheckout%y%xpurchase%y%xaddCart%y%xdeleteCart%y%zsection_id%y%xccate_id%y%xcontent_auth_kind_raw%yFREE%xchecked_by%y%xeditor%y%xcategorized_theme_id%y%xsearch%w%22tags%y%xkeywords%y%zscroll_depth%w%22page_height%v5309%uviewed_until%v940%uviewed_percent%v0.1770578263326427%uelapsed_since_page_load%v2.145%uelapsed_since_prev_action%v2.143%tastat.nikkeibp.co.jp/ATJ-2.16.9/177... https://astat.nikkeibp.co.jp/ATJ-2.16.9/1776812750668/19db24aee5e.ehk9e414rm05312dkdsr/1/ingest?k=78f152e5995154436289c30dd94b7801&a=infinity_scroll&c=page&aqe=%&d=%7B%22user%w%22user_id%y%xuser_status%y%xsite_session%vnull%ucustom_object%w%7D%uexternal_ids%w%7D%utimezone%v0%utimestamp%y2026-04-21T23%3A05%3A50.668Z%xviewport_height%v940%uviewport_width%v1350%uscreen_height%v600%uscreen_width%v800%ulayout%yunknown%zcontext%w%22app%vnull%uapp_version%vnull%usource%vnull%uedition%y%xcontent_id%y00008QVF%xcontent_name%vnull%ucontent_status%yopened%xpage_name%ybpindex%xpage_num%v1%ucategory_l1%yWWW%xcategory_l2%y%E6%97%A5%E7%B5%8CBP%xcategory_l3%y%E6%97%A5%E7%B5%8CBP%xtracking_code%y%xevents%vnull%ucustom_object%w%7D%ufunnel%w%7D%uroot_id%y19db24aee5e.ehk9e414rm05312dkdsr%xpage_title%y%E6%97%A5%E7%B5%8CBP%xurl%yhttps%3A%2F%2Fwww.nikkeibp.co.jp%2F%xreferrer%y%xproduct_family%ywww%xproduct%yCorp%xvisibility%yvisible%xnavigation_timing%w%22unload%v0%uredirect%v0%udns%v6%utcp%v139%urequest%v136%uresponse%v2%udom%v461%udomContent%v26%uonload%v0%uuntilResponseComplete%v507%uuntilDomComplete%v973%7D%unavigation_type%w%22type%v0%uredirectCount%v0%7D%uparent_content_name%y%xtheme_id%ywww%xaggregate_id%ywww-corp%xauthor_name%y%xpublish_date%y%xcontent_genre%y%xcontent_tags%ywww%xcontent_auth_kind%yFREE%xtotal_page_num%v0%uinternal_tracking_code%y%xtieup_id%y%xtieup_id_raw%y%xrep_tieup_id_raw%y%xpurchase%w%22name%y%xid%y%xprice%y%xcount%y%xpurchaseId%y%xprodView%y%xscView%y%xscCheckout%y%xpurchase%y%xaddCart%y%xdeleteCart%y%zsection_id%y%xccate_id%y%xcontent_auth_kind_raw%yFREE%xchecked_by%y%xeditor%y%xcategorized_theme_id%y%xsearch%w%22tags%y%xkeywords%y%zscroll_depth%w%22page_height%v5309%uviewed_until%v940%uviewed_percent%v0.1770578263326427%uelapsed_since_page_load%v2.145%uelapsed_since_prev_action%v2.143%t — 204 — 302 B — 75 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 922ms · 582KB · ¥1274/mo
www.nikkeibp.co.jp
Other
Costly
Execution 280ms
Transfer 15 KB
Monthly Cost ¥386/mo
Unattributable
Other
Costly
Execution 238ms
Transfer 0 KB
Monthly Cost ¥328/mo
Google Tag Manager
Tag Manager
Costly
Execution 96ms
Transfer 152 KB
Unused 42%
Monthly Cost ¥132/mo
Google Tag Manager
Tag Manager
Costly
Execution 93ms
Transfer 143 KB
Unused 44%
Monthly Cost ¥128/mo
www.nikkeibp.co.jp
Other
Costly
Execution 61ms
Transfer 95 KB
Unused 51%
Monthly Cost ¥85/mo
img.ak.impact-ad.jp
Other
Costly
Execution 52ms
Transfer 42 KB
Monthly Cost ¥72/mo
cdn.cxense.com
Other
Costly
Execution 52ms
Transfer 38 KB
Monthly Cost ¥72/mo
Facebook Pixel
Advertising
Costly
Execution 51ms
Transfer 97 KB
Unused 36%
Monthly Cost ¥70/mo

These scripts may cost more than they're worth

  • www.nikkeibp.co.jp adds 280ms and costs ~¥386/month
  • Unattributable adds 238ms and costs ~¥328/month
  • Google Tag Manager adds 96ms and costs ~¥132/month
  • Google Tag Manager adds 93ms and costs ~¥128/month
  • www.nikkeibp.co.jp adds 61ms and costs ~¥85/month
  • img.ak.impact-ad.jp adds 52ms and costs ~¥72/month
  • cdn.cxense.com adds 52ms and costs ~¥72/month
  • Facebook Pixel adds 51ms and costs ~¥70/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.nikkeibp.co.jp takes 280ms 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 238ms 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 96ms 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 93ms 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.nikkeibp.co.jp takes 61ms 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

51% of www.nikkeibp.co.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

img.ak.impact-ad.jp takes 52ms 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.cxense.com takes 52ms 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

Facebook Pixel takes 51ms 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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