Adding a Cache-Control header can significantly improve repeat-visit performance.
C
Image Optimization
Action
85 images, 0 KB saveable
REVIEW
85 images, 0 KB saveable
Warning::
!
https://studioglass.ua/uploads/mc.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://studioglass.ua/uploads/ns.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://studioglass.ua/img/card-img-3.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://studioglass.ua/img/card-img-2.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://studioglass.ua/img/icons/paw+monobank.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://studioglass.ua/uploads/fr.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://studioglass.ua/uploads/mzh.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://studioglass.ua/img/card-img-1.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://studioglass.ua/uploads/original/logo-w_2.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
85images5.7 MB
0oversized-0 KB
63legacy format
9missing 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
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
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
i
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
REVIEW
Main response uses gzip; brotli would be ~20% smaller
Info::
i
Main HTML response uses gzip (brotli would be ~20% smaller)
All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
i
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
i
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
!
16 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
!
Total JS execution time is 9.1 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
A
Third-Party Impact
26% third-party, 0 ms blocking
PASS
26% third-party, 0 ms blocking
Info::
i
Third-party code accounts for 26% of page weight (2.4 MiB of 9.4 MiB)
Info::
✓
Third-party blocking time is low (0 ms)
74%
26%
First-party Third-party
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 (229 KB)
PASS
6 fonts (229 KB)
Info::
i
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
229 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
Gina-Regular.woff2woff2swap
Size58 KB
Load time190 ms
Start962 ms
RiskFOUT — text flashes from fallback to web font
Gina-Light.woff2woff2swap
Size56 KB
Load time182 ms
Start963 ms
RiskFOUT — text flashes from fallback to web font
Gina-Thin.woff2woff2swap
Size56 KB
Load time186 ms
Start963 ms
RiskFOUT — text flashes from fallback to web font
font-woff;charset=utf-8...woffswap
Size2 KB
Load time28 ms
Start1.0 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size19 KB
Load time88 ms
Start3.8 s
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size37 KB
Load time29 ms
Start3.8 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
No optimization needed
PASS
No optimization needed
Info::
✓
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
✓
LCP image preload audit not available for this scan
A
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Warning::
!
Compressed response missing `Vary` header
The page is served with `Content-Encoding: gzip` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Network Waterfall
181 requests over 3880ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
49%of JavaScript execution is third-party
First-party Third-party4436ms · 1881KB · ₴1058/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
a.plerdy.com
a.plerdy.com
Other
818ms
124 KB
70%
₴195/mo
Costly
widgets.binotel.com
widgets.binotel.com
Other
576ms
2 KB
—
₴137/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
449ms
164 KB
40%
₴107/mo
Costly
maps.googleapis.com
maps.googleapis.com
Other
408ms
383 KB
57%
₴97/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
379ms
105 KB
31%
₴90/mo
Costly
analytics.tiktok.com
analytics.tiktok.com
Other
351ms
116 KB
48%
₴84/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
258ms
186 KB
41%
₴62/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
239ms
71 KB
30%
₴57/mo
Costly
widgets.binotel.com
widgets.binotel.com
Other
197ms
36 KB
—
₴47/mo
Optional
widgets.binotel.com
widgets.binotel.com
Other
163ms
15 KB
—
₴39/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
147ms
145 KB
53%
₴35/mo
Optional
statics.esputnik.com
statics.esputnik.com
Other
146ms
181 KB
79%
₴35/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
137ms
144 KB
44%
₴33/mo
Optional
widgets.binotel.com
widgets.binotel.com
Other
114ms
171 KB
65%
₴27/mo
Optional
analytics.tiktok.com
analytics.tiktok.com
Other
54ms
40 KB
—
₴13/mo
Optional
a.plerdy.com
Other
Costly
Execution818ms
Transfer124 KB
Unused70%
Monthly Cost₴195/mo
widgets.binotel.com
Other
Costly
Execution576ms
Transfer2 KB
Monthly Cost₴137/mo
Google Tag Manager
Tag Manager
Costly
Execution449ms
Transfer164 KB
Unused40%
Monthly Cost₴107/mo
maps.googleapis.com
Other
Costly
Execution408ms
Transfer383 KB
Unused57%
Monthly Cost₴97/mo
Facebook Pixel
Advertising
Costly
Execution379ms
Transfer105 KB
Unused31%
Monthly Cost₴90/mo
analytics.tiktok.com
Other
Costly
Execution351ms
Transfer116 KB
Unused48%
Monthly Cost₴84/mo
Google Tag Manager
Tag Manager
Costly
Execution258ms
Transfer186 KB
Unused41%
Monthly Cost₴62/mo
Facebook Pixel
Advertising
Costly
Execution239ms
Transfer71 KB
Unused30%
Monthly Cost₴57/mo
widgets.binotel.com
Other
Optional
Execution197ms
Transfer36 KB
Monthly Cost₴47/mo
widgets.binotel.com
Other
Optional
Execution163ms
Transfer15 KB
Monthly Cost₴39/mo
Google Tag Manager
Tag Manager
Optional
Execution147ms
Transfer145 KB
Unused53%
Monthly Cost₴35/mo
statics.esputnik.com
Other
Optional
Execution146ms
Transfer181 KB
Unused79%
Monthly Cost₴35/mo
Google Tag Manager
Tag Manager
Optional
Execution137ms
Transfer144 KB
Unused44%
Monthly Cost₴33/mo
widgets.binotel.com
Other
Optional
Execution114ms
Transfer171 KB
Unused65%
Monthly Cost₴27/mo
analytics.tiktok.com
Other
Optional
Execution54ms
Transfer40 KB
Monthly Cost₴13/mo
These scripts may cost more than they're worth
a.plerdy.com adds 818ms and costs ~₴195/month
widgets.binotel.com adds 576ms and costs ~₴137/month
Google Tag Manager adds 449ms and costs ~₴107/month
maps.googleapis.com adds 408ms and costs ~₴97/month
Facebook Pixel adds 379ms and costs ~₴90/month
analytics.tiktok.com adds 351ms and costs ~₴84/month
Google Tag Manager adds 258ms and costs ~₴62/month
Facebook Pixel adds 239ms and costs ~₴57/month
49% of JavaScript execution time comes from third-party scripts.
Why this matters
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
a.plerdy.com takes 818ms 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
70% of a.plerdy.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
widgets.binotel.com takes 576ms 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 449ms 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
maps.googleapis.com takes 408ms 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
57% of maps.googleapis.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 379ms 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
analytics.tiktok.com takes 351ms 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 258ms 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 239ms 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
53% 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
79% of statics.esputnik.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
65% of widgets.binotel.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.