Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
Info::
✓
Last-Modified header present
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
C
Image Optimization
Action
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://cdn.prod.website-files.com/64394b14f51ad18... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35images2.1 MB
0oversized-0 KB
30legacy format
13missing 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
Performance issues directly impact user engagement and conversion rates.
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
Document Compression
Document response uses gzip; brotli would be ~20% smaller
REVIEW
Document 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::
!
3 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 5.4 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.
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
43 fonts (1166 KB)
PASS
43 fonts (1166 KB)
Info::
i
43 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
43
1166 KB total
Render-blocking
0
of 43
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
SlGVmQWMvZQIdix7AFxXkHN...woff2swap
Size11 KB
Load time74 ms
Start402 ms
RiskFOUT — text flashes from fallback to web font
SlGWmQWMvZQIdix7AFxXmMh...woff2swap
Size11 KB
Load time63 ms
Start402 ms
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time112 ms
Start402 ms
RiskFOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc...woff2swap
Size44 KB
Load time115 ms
Start405 ms
RiskFOUT — text flashes from fallback to web font
jizaRExUiTo99u79D0KExcO...woff2swap
Size11 KB
Load time109 ms
Start405 ms
RiskFOUT — text flashes from fallback to web font
jizYRExUiTo99u79D0e0x8m...woff2swap
Size12 KB
Load time98 ms
Start405 ms
RiskFOUT — text flashes from fallback to web font
jizfRExUiTo99u79B_mh0O6...woff2swap
Size11 KB
Load time80 ms
Start405 ms
RiskFOUT — text flashes from fallback to web font
jizdRExUiTo99u79D0e8fOy...woff2swap
Size12 KB
Load time90 ms
Start405 ms
RiskFOUT — text flashes from fallback to web font
x-font-ttf;charset=utf-...unknownswap
Size2 KB
Load time83 ms
Start651 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time6 ms
Start730 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time9 ms
Start730 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time7 ms
Start730 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time10 ms
Start730 ms
RiskFOUT — text flashes from fallback to web font
64394b14f51ad171d80b6ad...ttfswap
Size60 KB
Load time157 ms
Start730 ms
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
lwoff2swap
Size32 KB
Load time7 ms
Start731 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size36 KB
Load time12 ms
Start812 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size38 KB
Load time12 ms
Start813 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size45 KB
Load time15 ms
Start813 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size60 KB
Load time13 ms
Start814 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time14 ms
Start814 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time15 ms
Start815 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time26 ms
Start855 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time14 ms
Start855 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size23 KB
Load time14 ms
Start855 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size23 KB
Load time24 ms
Start855 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time15 ms
Start856 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time16 ms
Start856 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size18 KB
Load time11 ms
Start856 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size15 KB
Load time23 ms
Start856 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size18 KB
Load time16 ms
Start856 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time17 ms
Start857 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time17 ms
Start857 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size32 KB
Load time18 ms
Start857 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size33 KB
Load time18 ms
Start858 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size32 KB
Load time19 ms
Start859 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size28 KB
Load time20 ms
Start859 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size27 KB
Load time21 ms
Start860 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size28 KB
Load time26 ms
Start860 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size27 KB
Load time30 ms
Start860 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size31 KB
Load time27 ms
Start860 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size31 KB
Load time28 ms
Start861 ms
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size47 KB
Load time68 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
open-sans-v17-vietnames...woff2swap
Size43 KB
Load time19 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)
Fixing the unchecked items could save ~19 KB and ~38 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
✓
Page uses 5 resource hint(s)
Current Resource Hints
preconnect
5
preload—
dns-prefetch—
prefetch—
5 resource hints configured
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+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
✓
cdn.prod.website-files.com serves assets with brotli (assets: 62)
Got: cdn.prod.website-files.com (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::
✓
`Last-Modified` present -- timestamp-based conditional GET supported
Consider also setting `ETag` for stronger revalidation -- ETags are content hashes that don't suffer from clock-skew or DST issues. Last-Modified alone is functional for conditional GETs and not a bug.
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
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
✓
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall
127 requests over 3870ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
77%of JavaScript execution is third-party
First-party Third-party4099ms · 952KB · €22/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
universe-static.elfsightcdn.com
universe-static.elfsightcdn.com
Other
2011ms
462 KB
46%
€11/mo
Costly
cdn.prod.website-files.com
cdn.prod.website-files.com
Other
1168ms
26 KB
—
€6/mo
Costly
d3e54v103j8qbb.cloudfront.net
d3e54v103j8qbb.cloudfront.net
Other
214ms
30 KB
—
€1/mo
Costly
cdn.prod.website-files.com
cdn.prod.website-files.com
Other
161ms
1 KB
—
€1/mo
Optional
static.botsrv2.com
static.botsrv2.com
Other
160ms
24 KB
—
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
143ms
123 KB
51%
€1/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
96ms
177 KB
42%
€1/mo
Optional
cookie.bestfreecdn.com
cookie.bestfreecdn.com
Other
92ms
101 KB
87%
€0/mo
Optional
Adobe Fonts
use.typekit.net
Font
53ms
8 KB
—
€0/mo
Optional
universe-static.elfsightcdn.com
Other
Costly
Execution2011ms
Transfer462 KB
Unused46%
Monthly Cost€11/mo
cdn.prod.website-files.com
Other
Costly
Execution1168ms
Transfer26 KB
Monthly Cost€6/mo
d3e54v103j8qbb.cloudfront.net
Other
Costly
Execution214ms
Transfer30 KB
Monthly Cost€1/mo
cdn.prod.website-files.com
Other
Optional
Execution161ms
Transfer1 KB
Monthly Cost€1/mo
static.botsrv2.com
Other
Optional
Execution160ms
Transfer24 KB
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution143ms
Transfer123 KB
Unused51%
Monthly Cost€1/mo
Google Tag Manager
Tag Manager
Optional
Execution96ms
Transfer177 KB
Unused42%
Monthly Cost€1/mo
cookie.bestfreecdn.com
Other
Optional
Execution92ms
Transfer101 KB
Unused87%
Monthly Cost€0/mo
Adobe Fonts
Font
Optional
Execution53ms
Transfer8 KB
Monthly Cost€0/mo
These scripts may cost more than they're worth
universe-static.elfsightcdn.com adds 2011ms and costs ~€11/month
cdn.prod.website-files.com adds 1168ms and costs ~€6/month
d3e54v103j8qbb.cloudfront.net adds 214ms and costs ~€1/month
77% 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
universe-static.elfsightcdn.com takes 2011ms 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
cdn.prod.website-files.com takes 1168ms 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
d3e54v103j8qbb.cloudfront.net 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
51% 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
87% of cookie.bestfreecdn.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.