https://t1.kakaocdn.net/thumb/C1120x1400.fwebp.q10... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://t1.kakaocdn.net/thumb/C1120x1400.fwebp.q10... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://t1.kakaocdn.net/thumb/C1120x1400.fwebp.q10... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://t1.kakaocdn.net/thumb/C1120x1400.fwebp.q10... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36images5.8 MB
0oversized-0 KB
19legacy format
4missing 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
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
B
HTTP Caching
no-cache,must-revalidate
REVIEW
no-cache,must-revalidate
Info::
✓
Cache-Control header is set
Got: no-cache,must-revalidate
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
no-cache,must-revalidate
Directive
Value
Meaning
no-cache
—
Cache but always revalidate first
must-revalidate
—
Must recheck with server after expiry
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
4 fonts (1360 KB)
PASS
4 fonts (1360 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
1360 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
KakaoSmall_Bold_OTF.woff2woff2swap
Size303 KB
Load time44 ms
Start4.4 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
KakaoSmall-Regular-v1.0...woff2swap
Size452 KB
Load time55 ms
Start4.4 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
KakaoBig-Bold-v1.0.woff2woff2swap
Size307 KB
Load time34 ms
Start4.4 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
KakaoBig-Regular-v1.0.w...woff2swap
Size298 KB
Load time2.0 s
Start4.4 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
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 ~680 KB and ~1360 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
✓
Page uses 6 resource hint(s)
Current Resource Hints
preconnect
1
preload
5
dns-prefetch—
prefetch—
6 resource hints configured
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
✓
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
69 requests over 8703ms
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-party4240ms · 927KB · ₩98964/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.kakaocorp.com
www.kakaocorp.com
Other
930ms
3 KB
—
₩21715/mo
Costly
www.kakaocorp.com
www.kakaocorp.com
Other
884ms
43 KB
—
₩20634/mo
Costly
Unattributable
Unattributable
Other
832ms
0 KB
—
₩19419/mo
Costly
www.kakaocorp.com
www.kakaocorp.com
Other
542ms
29 KB
—
₩12646/mo
Costly
www.kakaocorp.com
www.kakaocorp.com
Other
214ms
74 KB
56%
₩5000/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
210ms
156 KB
48%
₩4896/mo
Costly
www.kakaocorp.com
www.kakaocorp.com
Other
199ms
211 KB
85%
₩4649/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
148ms
46 KB
—
₩3459/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
119ms
97 KB
33%
₩2785/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
105ms
112 KB
63%
₩2460/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
56ms
156 KB
71%
₩1302/mo
Costly
www.kakaocorp.com
Other
Costly
Execution930ms
Transfer3 KB
Monthly Cost₩21715/mo
www.kakaocorp.com
Other
Costly
Execution884ms
Transfer43 KB
Monthly Cost₩20634/mo
Unattributable
Other
Costly
Execution832ms
Transfer0 KB
Monthly Cost₩19419/mo
www.kakaocorp.com
Other
Costly
Execution542ms
Transfer29 KB
Monthly Cost₩12646/mo
www.kakaocorp.com
Other
Costly
Execution214ms
Transfer74 KB
Unused56%
Monthly Cost₩5000/mo
Google Tag Manager
Tag Manager
Costly
Execution210ms
Transfer156 KB
Unused48%
Monthly Cost₩4896/mo
www.kakaocorp.com
Other
Costly
Execution199ms
Transfer211 KB
Unused85%
Monthly Cost₩4649/mo
Facebook Pixel
Advertising
Costly
Execution148ms
Transfer46 KB
Monthly Cost₩3459/mo
Facebook Pixel
Advertising
Costly
Execution119ms
Transfer97 KB
Unused33%
Monthly Cost₩2785/mo
Google Tag Manager
Tag Manager
Costly
Execution105ms
Transfer112 KB
Unused63%
Monthly Cost₩2460/mo
Google Tag Manager
Tag Manager
Costly
Execution56ms
Transfer156 KB
Unused71%
Monthly Cost₩1302/mo
These scripts may cost more than they're worth
www.kakaocorp.com adds 930ms and costs ~₩21715/month
www.kakaocorp.com adds 884ms and costs ~₩20634/month
Unattributable adds 832ms and costs ~₩19419/month
www.kakaocorp.com adds 542ms and costs ~₩12646/month
www.kakaocorp.com adds 214ms and costs ~₩5000/month
Google Tag Manager adds 210ms and costs ~₩4896/month
www.kakaocorp.com adds 199ms and costs ~₩4649/month
Facebook Pixel adds 148ms and costs ~₩3459/month
Facebook Pixel adds 119ms and costs ~₩2785/month
Google Tag Manager adds 105ms and costs ~₩2460/month
Google Tag Manager adds 56ms and costs ~₩1302/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.kakaocorp.com takes 930ms 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.kakaocorp.com takes 884ms 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 832ms 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.kakaocorp.com takes 542ms 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.kakaocorp.com takes 214ms 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
56% of www.kakaocorp.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
Google Tag Manager takes 210ms 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.kakaocorp.com takes 199ms 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
85% of www.kakaocorp.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
Facebook Pixel takes 148ms 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
Facebook Pixel takes 119ms 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
Google Tag Manager takes 105ms 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
63% of Google Tag Manager'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
Google Tag Manager takes 56ms 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
71% of Google Tag Manager'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.