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https://kantei.go.jp

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
5
PASS
5
INFO
2

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

Mobile Desktop
72
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
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.

1.11 s

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

10.24 s

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

4 ms

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

0.005

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

1.21 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.

10.44 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 5 REVIEW 3 FIX
F
Page Weight Budget
Action
12.4 MB transferred, 110 requests
FIX
12.4 MB transferred, 110 requests
Critical::
Page weighs 12.6 MB (12.4 MB transferred)
Warning::
Images are 11.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 11.0 MB
Info::
Fonts are 890 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 890 KB
Info::
CSS is 233 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 233 KB
Warning::
110 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.6 g CO2 per page load
12.4 MB / 2.4 MB budget
12.4 MB transferred
110 requests
2.6 g CO2 per page load
Images 11.0 MiB 89%
Fonts 890.3 KiB 7%
CSS 233.3 KiB 2%
JavaScript 178.8 KiB 1%
Other 37.5 KiB 0%
HTML 19.2 KiB 0%
Other 16.3 KiB 0%
Other 527 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (12.4 MiB of 12.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
110 resources · 12.4 MB · 121 KB savings available
FIX
110 resources · 12.4 MB · 121 KB savings available
Warning::
Page weight 11.4 MB over 1MB target
Got: 12.4 MB Expected: ≤ 1 MB
Info::
~121 KB of savings available
Warning::
109 third-party resources (100% of weight)
Info::
20 resources over 200KB
110 resources · 12.4 MiB · 109 third-party 11.4 MiB over 1MB target
Image 89% · 11.0 MiB
Font 7% · 890.3 KiB
CSS 2% · 233.3 KiB
JavaScript 1% · 178.8 KiB
Document 0% · 54.3 KiB
Other 0% · 826 B

~120.8 KiB of savings available

Remove unused JavaScript: 120.8 KiB
B
Image Optimization
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Info::
All images are well-optimized
44 images 11.0 MB
0 oversized -0 KB
44 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
649ms total JS execution
REVIEW
649ms total JS execution
Warning::
https://www.kantei.go.jp/: 267ms CPU time
Info::
https://www.kantei.go.jp/assets/js/common.js: 191ms CPU time
Info::
Unattributable: 190ms CPU time
Warning::
Third-party scripts: 649ms (100% of total)

Main Thread Breakdown

Style & Layout 55% Other 31% Rendering 7% Script Evaluation 5%
ScriptTotalScriptingParse/CompileParty
https://www.kantei.go.jp/267ms4ms0ms3rd
https://www.kantei.go.jp/assets/js/common.js191ms14ms3ms3rd
Unattributable190ms7ms0ms3rd
B
JS Bundles
2 scripts, 121 KB unused
REVIEW
2 scripts, 121 KB unused
Warning::
https://www.kantei.go.jp/assets/js/common.js: 121 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 121 KB
121 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.kantei.go.jp/assets/js/common.js158 KB121 KB (77%)✓3rd
https://cs.nakanohito.jp/b3/bi.js21 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

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

Green Hosting

No green hosting detected

B
HTTP Caching
max-age=0
REVIEW
max-age=0
Info::
Cache-Control header is set
Got: max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0

DirectiveValueMeaning
max-age0Cache for 0 seconds
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
50 fonts (890 KB)
PASS
50 fonts (890 KB)
Info::
50 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

50

890 KB total

Render-blocking

0

of 50

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 1.1 s LCP 10.2 shttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFYwQgP-FVthw.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFYwQgP-FVthw.woff2 — 24.4 KiB — 47 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.112.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.112.woff2 — 15.5 KiB — 45 ms — font-display: swaphttps://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.112.woff2xn71YHs72GKoTvER4Gn3b5e... https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.112.woff2 — 11.4 KiB — 122 ms — font-display: swaphttps://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.114.woff2xn71YHs72GKoTvER4Gn3b5e... https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.114.woff2 — 10.3 KiB — 150 ms — font-display: swaphttps://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.119.woff2xn71YHs72GKoTvER4Gn3b5e... https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.119.woff2 — 54.6 KiB — 178 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.117.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.117.woff2 — 11.5 KiB — 58 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.119.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.119.woff2 — 77.2 KiB — 173 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.116.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.116.woff2 — 16.1 KiB — 68 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.115.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.115.woff2 — 15.7 KiB — 73 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.114.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.114.woff2 — 14.1 KiB — 80 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.113.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.113.woff2 — 14.5 KiB — 82 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.110.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.110.woff2 — 15.5 KiB — 85 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.106.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.106.woff2 — 19.1 KiB — 158 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.104.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.104.woff2 — 17.4 KiB — 158 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.103.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.103.woff2 — 16.3 KiB — 93 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.100.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.100.woff2 — 19.7 KiB — 160 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.93.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.93.woff2 — 16.7 KiB — 104 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.109.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.109.woff2 — 14.9 KiB — 135 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.118.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.118.woff2 — 18.0 KiB — 148 ms — font-display: swaphttps://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.116.woff2xn71YHs72GKoTvER4Gn3b5e... https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.116.woff2 — 11.5 KiB — 158 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.101.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.101.woff2 — 15.4 KiB — 133 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.96.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.96.woff2 — 16.6 KiB — 163 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.78.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.78.woff2 — 19.6 KiB — 164 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.85.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.85.woff2 — 17.2 KiB — 126 ms — font-display: swaphttps://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.117.woff2xn71YHs72GKoTvER4Gn3b5e... https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.117.woff2 — 8.5 KiB — 162 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.105.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.105.woff2 — 17.2 KiB — 124 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.102.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.102.woff2 — 17.1 KiB — 160 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.99.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.99.woff2 — 18.9 KiB — 163 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.111.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.111.woff2 — 16.6 KiB — 115 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.107.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.107.woff2 — 16.3 KiB — 119 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.98.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.98.woff2 — 18.3 KiB — 158 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.94.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.94.woff2 — 17.7 KiB — 163 ms — font-display: swaphttps://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.80.woff2-F62fjtqLzI2JPCgQBnw7HF... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.80.woff2 — 17.9 KiB — 156 ms — font-display: 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Size 24 KB
Load time 47 ms
Start 351 ms
Risk FOUT — text flashes from fallback to web font
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Size 15 KB
Load time 45 ms
Start 352 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 11 KB
Load time 122 ms
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Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 10 KB
Load time 150 ms
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Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 55 KB
Load time 178 ms
Start 353 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 12 KB
Load time 58 ms
Start 357 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 77 KB
Load time 173 ms
Start 359 ms
Risk FOUT — text flashes from fallback to web font
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Size 16 KB
Load time 68 ms
Start 360 ms
Risk FOUT — text flashes from fallback to web font
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Size 16 KB
Load time 73 ms
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Risk FOUT — text flashes from fallback to web font
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Size 14 KB
Load time 80 ms
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Risk FOUT — text flashes from fallback to web font
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Size 15 KB
Load time 82 ms
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Risk FOUT — text flashes from fallback to web font
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Size 16 KB
Load time 85 ms
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Risk FOUT — text flashes from fallback to web font
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Size 19 KB
Load time 158 ms
Start 364 ms
Risk FOUT — text flashes from fallback to web font
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Size 17 KB
Load time 158 ms
Start 364 ms
Risk FOUT — text flashes from fallback to web font
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Size 16 KB
Load time 93 ms
Start 364 ms
Risk FOUT — text flashes from fallback to web font
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Size 20 KB
Load time 160 ms
Start 365 ms
Risk FOUT — text flashes from fallback to web font
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Size 17 KB
Load time 104 ms
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Risk FOUT — text flashes from fallback to web font
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Size 15 KB
Load time 135 ms
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Risk FOUT — text flashes from fallback to web font
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Size 18 KB
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Risk FOUT — text flashes from fallback to web font
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Size 11 KB
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Risk FOUT — text flashes from fallback to web font
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Size 15 KB
Load time 133 ms
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Risk FOUT — text flashes from fallback to web font
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Size 17 KB
Load time 163 ms
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Risk FOUT — text flashes from fallback to web font
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Size 20 KB
Load time 164 ms
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Risk FOUT — text flashes from fallback to web font
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Size 17 KB
Load time 126 ms
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Risk FOUT — text flashes from fallback to web font
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Size 8 KB
Load time 162 ms
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Risk FOUT — text flashes from fallback to web font
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Size 17 KB
Load time 124 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
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Size 17 KB
Load time 160 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
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Size 19 KB
Load time 163 ms
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Risk FOUT — text flashes from fallback to web font
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Size 17 KB
Load time 115 ms
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Risk FOUT — text flashes from fallback to web font
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Size 16 KB
Load time 119 ms
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Risk FOUT — text flashes from fallback to web font
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Size 18 KB
Load time 158 ms
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Risk FOUT — text flashes from fallback to web font
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Size 18 KB
Load time 163 ms
Start 370 ms
Risk FOUT — text flashes from fallback to web font
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Size 18 KB
Load time 156 ms
Start 370 ms
Risk FOUT — text flashes from fallback to web font
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Size 17 KB
Load time 148 ms
Start 370 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 19 KB
Load time 173 ms
Start 370 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 17 KB
Load time 151 ms
Start 371 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 19 KB
Load time 138 ms
Start 371 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 18 KB
Load time 145 ms
Start 371 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 12 KB
Load time 169 ms
Start 371 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 12 KB
Load time 156 ms
Start 372 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 14 KB
Load time 162 ms
Start 372 ms
Risk FOUT — text flashes from fallback to web font
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Size 18 KB
Load time 141 ms
Start 372 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 11 KB
Load time 40 ms
Start 730 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 13 KB
Load time 44 ms
Start 732 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 18 KB
Load time 36 ms
Start 772 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 18 KB
Load time 34 ms
Start 772 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 12 KB
Load time 34 ms
Start 816 ms
Risk FOUT — text flashes from fallback to web font
-F62fjtqLzI2JPCgQBnw7HF... woff2 swap
Size 17 KB
Load time 31 ms
Start 816 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 11 KB
Load time 36 ms
Start 818 ms
Risk FOUT — text flashes from fallback to web font
xn71YHs72GKoTvER4Gn3b5e... woff2 swap
Size 12 KB
Load time 37 ms
Start 820 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
110 requests over 1579ms
INFO
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https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.91.woff2 — 200 — 18.2 KiB — 34 ms — h3https://www.kantei.go.jp/assets/images/common/logo_jasrac.pngwww.kantei.go.jp/assets/images/comm... https://www.kantei.go.jp/assets/images/common/logo_jasrac.png — 200 — 9.4 KiB — 45 ms — h2https://www.kantei.go.jp/assets/images/common/icon_opinion.svgwww.kantei.go.jp/assets/images/comm... https://www.kantei.go.jp/assets/images/common/icon_opinion.svg — 200 — 1.7 KiB — 48 ms — h2https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.103.woff2fonts.gstatic.com/s/notoserifjp/v33... https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.103.woff2 — 200 — 11.9 KiB — 34 ms — h3https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.97.woff2fonts.gstatic.com/s/notosansjp/v56/... https://fonts.gstatic.com/s/notosansjp/v56/-F62fjtqLzI2JPCgQBnw7HFowwII2lcnk-AFfrgQrvWXpdFg3KXxAMsKMbdN.97.woff2 — 200 — 17.1 KiB — 31 ms — h3https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.115.woff2fonts.gstatic.com/s/notoserifjp/v33... https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.115.woff2 — 200 — 11.1 KiB — 36 ms — h3https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.110.woff2fonts.gstatic.com/s/notoserifjp/v33... https://fonts.gstatic.com/s/notoserifjp/v33/xn71YHs72GKoTvER4Gn3b5eMRtWGkp6o7MjQ2bzWPebFILO5wRiU5WBu-WF7i-bNCCMXP9Ju92PugSPO7A.110.woff2 — 200 — 11.8 KiB — 37 ms — h3https://www.kantei.go.jp/favicon.svgwww.kantei.go.jp/favicon.svg https://www.kantei.go.jp/favicon.svg — 200 — 15.4 KiB — 51 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 649ms · 177KB · ¥896/mo
www.kantei.go.jp
Other
Costly
Execution 267ms
Transfer 19 KB
Monthly Cost ¥369/mo
www.kantei.go.jp
Other
Costly
Execution 191ms
Transfer 158 KB
Unused 77%
Monthly Cost ¥264/mo
Unattributable
Other
Costly
Execution 190ms
Transfer 0 KB
Monthly Cost ¥263/mo

These scripts may cost more than they're worth

  • www.kantei.go.jp adds 267ms and costs ~¥369/month
  • www.kantei.go.jp adds 191ms and costs ~¥264/month
  • Unattributable adds 190ms and costs ~¥263/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.kantei.go.jp takes 267ms 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.kantei.go.jp takes 191ms 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

77% of www.kantei.go.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

Unattributable takes 190ms 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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