Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
787 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.60 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
8 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.
927 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
2.65 s
Page Load Progression
623 ms
1.2 s 1.9 s 2.5 s 3.1 s 3.7 s 4.4 s
5.0 sFPage Weight BudgetAction3.6 MB transferred, 97 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
DThird-Party ImpactAction99% third-party, 0 ms blockingFIX
DPage Weight InventoryAction97 resources · 3.6 MB · 203 KB savings availableFIX
~203.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 97 resources | 3.6 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
private, no-store, no-cache, must-revalidate, max-age=0
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
| no-store | — | Never cache this response |
| no-cache | — | Cache but always revalidate first |
| must-revalidate | — | Must recheck with server after expiry |
| max-age | 0 | Cache for 0 seconds |
BImage Optimization60 images, 0 KB saveableREVIEW
BJS Execution Cost512ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://ameblo.jp/ | 243ms | 15ms | 1ms | 1st |
| Unattributable | 141ms | 6ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HQSMEN0RQG&cx=c>m=4e64f0h1 | 67ms | 54ms | 12ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N49WWL | 61ms | 45ms | 13ms | 3rd |
CJS BundlesAction17 scripts, 203 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-N49WWL | 164 KB | 73 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HQSMEN0RQG&cx=c>m=4e64f0h1 | 173 KB | 70 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-608763171&cx=c>m=4e64f0h1 | 144 KB | 61 KB (42%) | ✓ | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/421-8d83f79d793f08af.js | 6 KB | — | ✓ | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/pages/index-ff9728a8e546a00c.js | 7 KB | — | ✓ | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/438-ff01bd82a91e4ca0.js | 4 KB | — | ✓ | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/207-2c6122a0ff6fad1e.js | 4 KB | — | ✓ | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/441-3ebaef9854842f0d.js | 2 KB | — | ✓ | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/webpack-9b3c9204b9be25ec.js | 2 KB | — | ✓ | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/338-fe1ec5b81d564b83.js | 4 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading1 fonts (3 KB)PASS
Web fonts
1
3 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall97 requests over 2689msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 141ms | 0 KB | — | ¥195/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 67ms | 173 KB | 40% | ¥92/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 61ms | 164 KB | 45% | ¥84/mo | Costly |
These scripts may cost more than they're worth
- Unattributable adds 141ms and costs ~¥195/month
- Google Tag Manager adds 67ms and costs ~¥92/month
- Google Tag Manager adds 61ms and costs ~¥84/month
52% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
Unattributable takes 141ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 67ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 61ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev