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.
4.16 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.14 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
18.83 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.142
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.04 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.
44.28 s
Page Load Progression
FPage Weight BudgetAction11.9 MB transferred, 135 requestsFIX
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction43100ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.sony.co.jp/en/assets_revamp2025/javascripts/index-7d9a9c74.js | 40580ms | 528ms | 0ms | 3rd |
| https://www.sony.co.jp/en/assets_revamp2025/javascripts/page-initializer-bca07b23.js | 787ms | 576ms | 0ms | 3rd |
| https://fast.fonts.net/jsapi/core/mt_otf.js | 456ms | 409ms | 2ms | 3rd |
| Unattributable | 431ms | 64ms | 0ms | 3rd |
| https://www.sony.co.jp/en/ | 413ms | 8ms | 1ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js | 127ms | 66ms | 18ms | 3rd |
| https://www.sony.co.jp/en/assets_revamp2025/javascripts/pages/home.js | 96ms | 39ms | 0ms | 3rd |
| https://www.sony.co.jp/en/assets_revamp2025/javascripts/components/pages/home/mission.js | 81ms | 46ms | 0ms | 3rd |
| https://ce.mf.marsflag.com/v1/js/mf-search.js | 75ms | 63ms | 12ms | 3rd |
| https://www.sony.co.jp/en/assets_revamp2025/javascripts/components/ui/heading.js | 52ms | 25ms | 0ms | 3rd |
DPage Weight InventoryAction135 resources · 11.9 MB · 194 KB savings availableFIX
~194.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 135 resources | 11.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction27 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS BundlesAction67 scripts, 194 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js | 127 KB | 66 KB (52%) | ✓ | 3rd |
| https://ce.mf.marsflag.com/v1/js/mf-search.js | 116 KB | 60 KB (52%) | ✓ | 3rd |
| https://www.sony.co.jp/en/assets_revamp2025/javascripts/PageBackground-5831f7fd.js | 115 KB | 47 KB (41%) | ✓ | 3rd |
| https://www.sony.co.jp/en/template/2022/v50/en/js/jquery-3.6.0.min.js | 30 KB | 21 KB (70%) | ✓ | 3rd |
| https://cdn.cookielaw.org/consent/0195ff30-005c-7fff-82fa-a2e779f40719/OtAutoBlock.js | 4 KB | — | ✓ | 3rd |
| https://cdn.cookielaw.org/consent/0195ff30-005c-7fff-82fa-a2e779f40719/otSDKStub.js | 10 KB | — | ✓ | 3rd |
| https://www.sony.co.jp/en/template/2018/v50/en/js/jquery.easing.1.3.js | 2 KB | — | ✓ | 3rd |
| https://www.sony.co.jp/en/template/2018/v50/en/js/jquery.cookie.js | 1 KB | — | ✓ | 3rd |
| https://www.sony.co.jp/en/template/2018/v50/en/js/includeCommon.js | 2 KB | — | ✓ | 3rd |
| https://www.sony.co.jp/en/template/2018/v50/en/js/tile.js | 1 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
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 Loading7 fonts (8800 KB)PASS
Web fonts
7
8800 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)
Fixing the unchecked items could save ~4394 KB and ~8788 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall135 requests over 5117msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.sony.co.jp www.sony.co.jp | Other | 40580ms | 27 KB | — | €441/mo | Costly |
www.sony.co.jp www.sony.co.jp | Other | 787ms | 1 KB | — | €9/mo | Costly |
fast.fonts.net fast.fonts.net | Other | 456ms | 23 KB | — | €5/mo | Costly |
Unattributable Unattributable | Other | 431ms | 0 KB | — | €5/mo | Costly |
www.sony.co.jp www.sony.co.jp | Other | 413ms | 16 KB | — | €4/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 127ms | 127 KB | 52% | €1/mo | Essential |
www.sony.co.jp www.sony.co.jp | Other | 96ms | 1 KB | — | €1/mo | Optional |
www.sony.co.jp www.sony.co.jp | Other | 81ms | 2 KB | — | €1/mo | Optional |
ce.mf.marsflag.com ce.mf.marsflag.com | Other | 75ms | 116 KB | 52% | €1/mo | Optional |
www.sony.co.jp www.sony.co.jp | Other | 52ms | 1 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.sony.co.jp adds 40580ms and costs ~€441/month
- www.sony.co.jp adds 787ms and costs ~€9/month
- fast.fonts.net adds 456ms and costs ~€5/month
- Unattributable adds 431ms and costs ~€5/month
- www.sony.co.jp adds 413ms and costs ~€4/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.sony.co.jp takes 40580ms 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
www.sony.co.jp takes 787ms 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
fast.fonts.net takes 456ms 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
Unattributable takes 431ms 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
www.sony.co.jp takes 413ms 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
52% of OneTrust's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
52% of ce.mf.marsflag.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev