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
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/fina... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/mit_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/reut... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/04/airf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2024/04/ph_l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/defe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/fore... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/04/air-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/04/seaw... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/dece... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2024/04/paja... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/the_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/news... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/05/cnbc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2026/04/ai-a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2024/04/ph_y... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://bavovna.ai/wp-content/uploads/2024/06/WSJ_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
34images11.3 MB
0oversized-0 KB
31legacy format
17missing 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
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
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
A+
Third-Party Impact
10% third-party, 0 ms blocking
PASS
10% third-party, 0 ms blocking
Info::
i
Third-party code accounts for 10% of page weight (1.4 MiB of 14.0 MiB)
Info::
✓
Third-party blocking time is low (0 ms)
90%
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
2 fonts (28 KB)
PASS
2 fonts (28 KB)
Info::
i
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
28 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
S6uyw4BMUTPHjx4wXiWtFCc...woff2swap
Size14 KB
Load time24 ms
Start1.3 s
RiskFOUT — text flashes from fallback to web font
S6u9w4BMUTPHh6UVSwiPGQ3...woff2swap
Size14 KB
Load time20 ms
Start1.3 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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
✓
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document response uses brotli
Info::
✓
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A
Asset Compression
1 of 3 asset hosts still on gzip
PASS
1 of 3 asset hosts still on gzip
Info::
✓
cdnjs.cloudflare.com serves assets with brotli (assets: 4)
Got: cdnjs.cloudflare.com (text/css)
Info::
i
www.googletagmanager.com serves assets with gzip; brotli would be ~20% smaller (assets: 4)
Every current browser accepts brotli. On a CDN this is a per-pull-zone toggle (Cloudflare, Fastly, CloudFront, CDN77, Bunny all expose it); on an origin it needs the brotli module (nginx-brotli, Apache mod_brotli). The saving lands on the assets this host serves, not on the HTML document -- the document's own encoding is reported separately.
cdn.jsdelivr.net serves assets with brotli (assets: 3)
Got: cdn.jsdelivr.net (text/css)
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
Info::
✓
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
i
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
Network Waterfall
93 requests over 3835ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
50%of JavaScript execution is third-party
First-party Third-party1162ms · 909KB · €13/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.gstatic.com
www.gstatic.com
Other
280ms
346 KB
71%
€3/mo
Costly
Microsoft Clarity
scripts.clarity.ms
Session Replay
232ms
25 KB
—
€3/mo
Costly
jsDelivr
cdn.jsdelivr.net
CDN
215ms
43 KB
58%
€2/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
146ms
187 KB
42%
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
144ms
160 KB
39%
€2/mo
Optional
cdnjs
cdnjs.cloudflare.com
CDN
77ms
27 KB
—
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
68ms
119 KB
55%
€1/mo
Optional
www.gstatic.com
Other
Costly
Execution280ms
Transfer346 KB
Unused71%
Monthly Cost€3/mo
Microsoft Clarity
Session Replay
Costly
Execution232ms
Transfer25 KB
Monthly Cost€3/mo
jsDelivr
CDN
Costly
Execution215ms
Transfer43 KB
Unused58%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution146ms
Transfer187 KB
Unused42%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution144ms
Transfer160 KB
Unused39%
Monthly Cost€2/mo
cdnjs
CDN
Optional
Execution77ms
Transfer27 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution68ms
Transfer119 KB
Unused55%
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.gstatic.com adds 280ms and costs ~€3/month
Microsoft Clarity adds 232ms and costs ~€3/month
jsDelivr adds 215ms and costs ~€2/month
50% 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
www.gstatic.com takes 280ms 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 www.gstatic.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
Microsoft Clarity takes 232ms 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
jsDelivr takes 215ms 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
58% of jsDelivr'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
55% 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.