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
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
!
https://www.sony.com/en/top/2021/img/sns_yt.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sony.com/en/top/2021/img/sns_x.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sony.com/en/top/2021/img/sns_ig.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sony.com/en/top/2021/img/sns_fb.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sony.com/en/top/2021/img/sns_li.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sony.com/en/top/2021/img/sns_tiktok.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.sony.com/en/template/2023/img/logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24images916 KB
0oversized-0 KB
6legacy format
7missing dimensionsCLS 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
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
6 fonts (256 KB)
PASS
6 fonts (256 KB)
Info::
i
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
256 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
dcb015ed-475f-4221-9b3c...woff2swap
Size121 KB
Load time43 ms
Start3.8 s
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
f2c57125-0b07-4b47-9b3e...woff2swap
Size112 KB
Load time42 ms
Start3.8 s
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
01234569ABCDEFGHIJKLMNO...woff2swap
Size11 KB
Load time52 ms
Start4.0 s
RiskFOUT — text flashes from fallback to web font
f2c57125-0b07-4b47-9b3e...woff2swap
Size0 KB
Load time14 ms
Start4.3 s
RiskFOUT — text flashes from fallback to web font
dcb015ed-475f-4221-9b3c...woff2swap
Size0 KB
Load time14 ms
Start4.5 s
RiskFOUT — text flashes from fallback to web font
01234569ABCDEFGHIJKLMNO...woff2swap
Size11 KB
Load time21 ms
Start4.6 s
RiskFOUT — 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)
Fixing the unchecked items could save ~116 KB and ~232 ms
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
104 requests over 5192ms
INFO
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-party4775ms · 1435KB · $63/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
OneTrust
cdn.cookielaw.org
Consent
1537ms
1001 KB
—
$20/mo
Essential
fast.fonts.net
fast.fonts.net
Other
846ms
23 KB
—
$11/mo
Costly
www.sony.com
www.sony.com
Other
531ms
27 KB
—
$7/mo
Costly
www.sony.com
www.sony.com
Other
369ms
1 KB
20%
$5/mo
Costly
www.sony.com
www.sony.com
Other
365ms
23 KB
—
$5/mo
Costly
Unattributable
Unattributable
Other
326ms
0 KB
—
$4/mo
Costly
www.sony.com
www.sony.com
Other
244ms
10 KB
—
$3/mo
Costly
OneTrust
cdn.cookielaw.org
Consent
140ms
130 KB
52%
$2/mo
Essential
www.sony.com
www.sony.com
Other
118ms
70 KB
63%
$2/mo
Optional
www.sony.com
www.sony.com
Other
84ms
30 KB
71%
$1/mo
Optional
ce.mf.marsflag.com
ce.mf.marsflag.com
Other
81ms
110 KB
52%
$1/mo
Optional
www.sony.com
www.sony.com
Other
74ms
0 KB
91%
$1/mo
Optional
OneTrust
cdn.cookielaw.org
Consent
59ms
10 KB
—
$1/mo
Essential
OneTrust
Consent
Essential
Execution1537ms
Transfer1001 KB
Monthly Cost$20/mo
fast.fonts.net
Other
Costly
Execution846ms
Transfer23 KB
Monthly Cost$11/mo
www.sony.com
Other
Costly
Execution531ms
Transfer27 KB
Monthly Cost$7/mo
www.sony.com
Other
Costly
Execution369ms
Transfer1 KB
Unused20%
Monthly Cost$5/mo
www.sony.com
Other
Costly
Execution365ms
Transfer23 KB
Monthly Cost$5/mo
Unattributable
Other
Costly
Execution326ms
Transfer0 KB
Monthly Cost$4/mo
www.sony.com
Other
Costly
Execution244ms
Transfer10 KB
Monthly Cost$3/mo
OneTrust
Consent
Essential
Execution140ms
Transfer130 KB
Unused52%
Monthly Cost$2/mo
www.sony.com
Other
Optional
Execution118ms
Transfer70 KB
Unused63%
Monthly Cost$2/mo
www.sony.com
Other
Optional
Execution84ms
Transfer30 KB
Unused71%
Monthly Cost$1/mo
ce.mf.marsflag.com
Other
Optional
Execution81ms
Transfer110 KB
Unused52%
Monthly Cost$1/mo
www.sony.com
Other
Optional
Execution74ms
Transfer0 KB
Unused91%
Monthly Cost$1/mo
OneTrust
Consent
Essential
Execution59ms
Transfer10 KB
Monthly Cost$1/mo
These scripts may cost more than they're worth
fast.fonts.net adds 846ms and costs ~$11/month
www.sony.com adds 531ms and costs ~$7/month
www.sony.com adds 369ms and costs ~$5/month
www.sony.com adds 365ms and costs ~$5/month
Unattributable adds 326ms and costs ~$4/month
www.sony.com adds 244ms and costs ~$3/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
fast.fonts.net takes 846ms 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.sony.com takes 531ms 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.sony.com takes 369ms 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.sony.com takes 365ms 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 326ms 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.sony.com takes 244ms 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
52% of OneTrust'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
63% of www.sony.com'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
71% of www.sony.com'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
52% of ce.mf.marsflag.com'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
91% of www.sony.com'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.