Performance
· 17 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.
3.85 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
16.30 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
504 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.
6.64 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.
16.40 s
Page Load Progression
FPage Weight BudgetAction3.4 MB transferred, 88 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
DJS Execution CostAction2423ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://ameblo.jp/ | 836ms | 22ms | 2ms | 1st |
| Unattributable | 557ms | 26ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N49WWL | 298ms | 218ms | 69ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HQSMEN0RQG&cx=c>m=4e64f0 | 259ms | 213ms | 38ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-608763171&cx=c>m=4e64f0 | 199ms | 157ms | 32ms | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/pages/index-ff9728a8e546a00c.js | 152ms | 144ms | 2ms | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/framework-24fda4117f092221.js | 73ms | 54ms | 11ms | 3rd |
| https://stat100.ameba.jp/ameblo/portal/20251212-4180222/_next/static/chunks/main-9c5dd558e4dc80e5.js | 51ms | 41ms | 8ms | 3rd |
DPage Weight InventoryAction88 resources · 3.4 MB · 202 KB savings availableFIX
~202.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 88 resources | 3.4 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 Optimization53 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
CJS BundlesAction17 scripts, 202 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 (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HQSMEN0RQG&cx=c>m=4e64f0 | 173 KB | 69 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-608763171&cx=c>m=4e64f0 | 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 | 3 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 Hints7 hints, 0 missing preconnectsPASS
Current Resource Hints
7 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall88 requests over 6858msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 557ms | 0 KB | — | ¥769/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 298ms | 164 KB | 44% | ¥411/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 259ms | 173 KB | 40% | ¥358/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 199ms | 144 KB | 42% | ¥275/mo | Costly |
stat100.ameba.jp stat100.ameba.jp | Other | 152ms | 7 KB | — | ¥210/mo | Costly |
stat100.ameba.jp stat100.ameba.jp | Other | 73ms | 39 KB | — | ¥101/mo | Costly |
stat100.ameba.jp stat100.ameba.jp | Other | 51ms | 30 KB | — | ¥70/mo | Costly |
These scripts may cost more than they're worth
- Unattributable adds 557ms and costs ~¥769/month
- Google Tag Manager adds 298ms and costs ~¥411/month
- Google Tag Manager adds 259ms and costs ~¥358/month
- Google Tag Manager adds 199ms and costs ~¥275/month
- stat100.ameba.jp adds 152ms and costs ~¥210/month
- stat100.ameba.jp adds 73ms and costs ~¥101/month
- stat100.ameba.jp adds 51ms and costs ~¥70/month
66% 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 557ms 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 298ms 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 259ms 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 199ms 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
stat100.ameba.jp takes 152ms 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
stat100.ameba.jp takes 73ms 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
stat100.ameba.jp takes 51ms 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