Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
Why this matters
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
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
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
!
9 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.
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
41 fonts (1058 KB)
PASS
41 fonts (1058 KB)
Info::
i
41 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
41
1058 KB total
Render-blocking
0
of 41
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
x-font-ttf;charset=utf-...unknownswap
Size2 KB
Load time55 ms
Start399 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time8 ms
Start452 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time8 ms
Start453 ms
RiskFOUT — text flashes from fallback to web font
SlGVmQWMvZQIdix7AFxXkHN...woff2swap
Size11 KB
Load time90 ms
Start464 ms
RiskFOUT — text flashes from fallback to web font
SlGWmQWMvZQIdix7AFxXmMh...woff2swap
Size11 KB
Load time75 ms
Start464 ms
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time120 ms
Start464 ms
RiskFOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc...woff2swap
Size44 KB
Load time130 ms
Start465 ms
RiskFOUT — text flashes from fallback to web font
jizaRExUiTo99u79D0KExcO...woff2swap
Size11 KB
Load time115 ms
Start465 ms
RiskFOUT — text flashes from fallback to web font
jizYRExUiTo99u79D0e0x8m...woff2swap
Size12 KB
Load time109 ms
Start465 ms
RiskFOUT — text flashes from fallback to web font
jizfRExUiTo99u79B_mh0O6...woff2swap
Size11 KB
Load time96 ms
Start466 ms
RiskFOUT — text flashes from fallback to web font
jizdRExUiTo99u79D0e8fOy...woff2swap
Size12 KB
Load time105 ms
Start466 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size36 KB
Load time32 ms
Start480 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size38 KB
Load time20 ms
Start482 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size45 KB
Load time31 ms
Start482 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size60 KB
Load time21 ms
Start482 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time21 ms
Start483 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time22 ms
Start483 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time23 ms
Start483 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time23 ms
Start483 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size23 KB
Load time23 ms
Start484 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size23 KB
Load time20 ms
Start488 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time20 ms
Start489 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time20 ms
Start489 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time20 ms
Start489 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time20 ms
Start490 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size18 KB
Load time20 ms
Start491 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size15 KB
Load time20 ms
Start491 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size18 KB
Load time28 ms
Start491 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time23 ms
Start491 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time23 ms
Start492 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size32 KB
Load time24 ms
Start492 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size33 KB
Load time25 ms
Start492 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size32 KB
Load time26 ms
Start492 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size28 KB
Load time26 ms
Start493 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size27 KB
Load time29 ms
Start493 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size28 KB
Load time30 ms
Start493 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size27 KB
Load time31 ms
Start493 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size32 KB
Load time32 ms
Start494 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size31 KB
Load time32 ms
Start494 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size31 KB
Load time33 ms
Start494 ms
RiskFOUT — text flashes from fallback to web font
open-sans-v17-vietnames...woff2swap
Size43 KB
Load time28 ms
Start2.7 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 ~1 KB and ~2 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
✓
Page uses 4 resource hint(s)
Current Resource Hints
preconnect
4
preload—
dns-prefetch—
prefetch—
4 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: 33)
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
87 requests over 2819ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
76%of JavaScript execution is third-party
First-party Third-party1738ms · 483KB · €19/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
cdn.prod.website-files.com
cdn.prod.website-files.com
Other
789ms
26 KB
—
€9/mo
Costly
d3e54v103j8qbb.cloudfront.net
d3e54v103j8qbb.cloudfront.net
Other
259ms
31 KB
—
€3/mo
Costly
static.botsrv2.com
static.botsrv2.com
Other
173ms
24 KB
—
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
154ms
123 KB
51%
€2/mo
Optional
cdn.prod.website-files.com
cdn.prod.website-files.com
Other
152ms
1 KB
—
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
120ms
177 KB
42%
€1/mo
Optional
cookie.bestfreecdn.com
cookie.bestfreecdn.com
Other
91ms
101 KB
87%
€1/mo
Optional
cdn.prod.website-files.com
Other
Costly
Execution789ms
Transfer26 KB
Monthly Cost€9/mo
d3e54v103j8qbb.cloudfront.net
Other
Costly
Execution259ms
Transfer31 KB
Monthly Cost€3/mo
static.botsrv2.com
Other
Optional
Execution173ms
Transfer24 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution154ms
Transfer123 KB
Unused51%
Monthly Cost€2/mo
cdn.prod.website-files.com
Other
Optional
Execution152ms
Transfer1 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution120ms
Transfer177 KB
Unused42%
Monthly Cost€1/mo
cookie.bestfreecdn.com
Other
Optional
Execution91ms
Transfer101 KB
Unused87%
Monthly Cost€1/mo
These scripts may cost more than they're worth
cdn.prod.website-files.com adds 789ms and costs ~€9/month
d3e54v103j8qbb.cloudfront.net adds 259ms and costs ~€3/month
76% 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
cdn.prod.website-files.com takes 789ms 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 259ms 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.