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.
B
Image Optimization
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
!
https://vk.com/al_im.php?act=vkme_landing&ref= is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14images144 KB
0oversized-0 KB
4legacy format
1missing 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
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
2 fonts (36 KB)
PASS
2 fonts (36 KB)
Info::
i
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
36 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
VKSansDisplayBold.woff2woff2swap
Size18 KB
Load time248 ms
Start1.8 s
RiskFOUT — text flashes from fallback to web font
VK_Sans_Display_Regular...woff2swap
Size18 KB
Load time250 ms
Start1.8 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)
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
✓
Page uses 2 resource hint(s)
Current Resource Hints
preconnect
2
preload—
dns-prefetch—
prefetch—
2 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
105 requests over 2960ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
90%of JavaScript execution is third-party
First-party Third-party3030ms · 1723KB · ₽897/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
st.vk.com
st.vk.com
Other
1203ms
838 KB
71%
₽356/mo
Costly
st.vk.com
st.vk.com
Other
887ms
28 KB
—
₽263/mo
Costly
Unattributable
Unattributable
Other
356ms
0 KB
—
₽106/mo
Costly
st.vk.com
st.vk.com
Other
167ms
428 KB
63%
₽49/mo
Optional
st.vk.com
st.vk.com
Other
104ms
50 KB
69%
₽31/mo
Optional
st.vk.com
st.vk.com
Other
98ms
249 KB
94%
₽29/mo
Optional
st.vk.com
st.vk.com
Other
91ms
54 KB
94%
₽27/mo
Optional
st.vk.com
st.vk.com
Other
72ms
39 KB
73%
₽21/mo
Optional
st.vk.com
st.vk.com
Other
50ms
38 KB
99%
₽15/mo
Optional
st.vk.com
Other
Costly
Execution1203ms
Transfer838 KB
Unused71%
Monthly Cost₽356/mo
st.vk.com
Other
Costly
Execution887ms
Transfer28 KB
Monthly Cost₽263/mo
Unattributable
Other
Costly
Execution356ms
Transfer0 KB
Monthly Cost₽106/mo
st.vk.com
Other
Optional
Execution167ms
Transfer428 KB
Unused63%
Monthly Cost₽49/mo
st.vk.com
Other
Optional
Execution104ms
Transfer50 KB
Unused69%
Monthly Cost₽31/mo
st.vk.com
Other
Optional
Execution98ms
Transfer249 KB
Unused94%
Monthly Cost₽29/mo
st.vk.com
Other
Optional
Execution91ms
Transfer54 KB
Unused94%
Monthly Cost₽27/mo
st.vk.com
Other
Optional
Execution72ms
Transfer39 KB
Unused73%
Monthly Cost₽21/mo
st.vk.com
Other
Optional
Execution50ms
Transfer38 KB
Unused99%
Monthly Cost₽15/mo
These scripts may cost more than they're worth
st.vk.com adds 1203ms and costs ~₽356/month
st.vk.com adds 887ms and costs ~₽263/month
Unattributable adds 356ms and costs ~₽106/month
90% 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
st.vk.com takes 1203ms 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 st.vk.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
st.vk.com takes 887ms 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 356ms 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 st.vk.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
69% of st.vk.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
94% of st.vk.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
94% of st.vk.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
73% of st.vk.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
99% of st.vk.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.