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::
!
8 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.
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
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 time33 ms
Start417 ms
RiskFOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX...woff2swap
Size42 KB
Load time105 ms
Start449 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time11 ms
Start451 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time12 ms
Start451 ms
RiskFOUT — text flashes from fallback to web font
SlGVmQWMvZQIdix7AFxXkHN...woff2swap
Size11 KB
Load time55 ms
Start456 ms
RiskFOUT — text flashes from fallback to web font
SlGWmQWMvZQIdix7AFxXmMh...woff2swap
Size11 KB
Load time96 ms
Start456 ms
RiskFOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc...woff2swap
Size44 KB
Load time110 ms
Start457 ms
RiskFOUT — text flashes from fallback to web font
jizaRExUiTo99u79D0KExcO...woff2swap
Size11 KB
Load time82 ms
Start457 ms
RiskFOUT — text flashes from fallback to web font
jizYRExUiTo99u79D0e0x8m...woff2swap
Size12 KB
Load time68 ms
Start457 ms
RiskFOUT — text flashes from fallback to web font
jizfRExUiTo99u79B_mh0O6...woff2swap
Size11 KB
Load time76 ms
Start458 ms
RiskFOUT — text flashes from fallback to web font
jizdRExUiTo99u79D0e8fOy...woff2swap
Size12 KB
Load time100 ms
Start458 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size36 KB
Load time15 ms
Start577 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size38 KB
Load time17 ms
Start578 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size45 KB
Load time16 ms
Start578 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size60 KB
Load time18 ms
Start578 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time18 ms
Start578 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time17 ms
Start580 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time17 ms
Start580 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time18 ms
Start580 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size23 KB
Load time17 ms
Start581 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size23 KB
Load time18 ms
Start582 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time19 ms
Start582 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time20 ms
Start582 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size24 KB
Load time19 ms
Start584 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size25 KB
Load time20 ms
Start584 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size18 KB
Load time16 ms
Start616 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size15 KB
Load time20 ms
Start616 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size18 KB
Load time16 ms
Start617 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time21 ms
Start617 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size19 KB
Load time23 ms
Start617 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size32 KB
Load time31 ms
Start617 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size33 KB
Load time39 ms
Start620 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size32 KB
Load time22 ms
Start620 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size28 KB
Load time23 ms
Start620 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size27 KB
Load time25 ms
Start620 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size28 KB
Load time29 ms
Start621 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size27 KB
Load time30 ms
Start622 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size32 KB
Load time34 ms
Start622 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size31 KB
Load time36 ms
Start622 ms
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size31 KB
Load time33 ms
Start625 ms
RiskFOUT — text flashes from fallback to web font
open-sans-v17-vietnames...woff2swap
Size43 KB
Load time19 ms
Start3.6 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
Network Waterfall
86 requests over 3645ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
59%of JavaScript execution is third-party
First-party Third-party1214ms · 479KB · €13/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
d3e54v103j8qbb.cloudfront.net
d3e54v103j8qbb.cloudfront.net
Other
200ms
31 KB
—
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
189ms
123 KB
51%
€2/mo
Optional
static.botsrv2.com
static.botsrv2.com
Other
186ms
24 KB
—
€2/mo
Optional
cdn.prod.website-files.com
cdn.prod.website-files.com
Other
174ms
1 KB
—
€2/mo
Optional
cdn.prod.website-files.com
cdn.prod.website-files.com
Other
164ms
1 KB
—
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
141ms
177 KB
42%
€2/mo
Optional
cookie.bestfreecdn.com
cookie.bestfreecdn.com
Other
107ms
101 KB
87%
€1/mo
Optional
cdn.prod.website-files.com
cdn.prod.website-files.com
Other
53ms
21 KB
—
€1/mo
Optional
d3e54v103j8qbb.cloudfront.net
Other
Optional
Execution200ms
Transfer31 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution189ms
Transfer123 KB
Unused51%
Monthly Cost€2/mo
static.botsrv2.com
Other
Optional
Execution186ms
Transfer24 KB
Monthly Cost€2/mo
cdn.prod.website-files.com
Other
Optional
Execution174ms
Transfer1 KB
Monthly Cost€2/mo
cdn.prod.website-files.com
Other
Optional
Execution164ms
Transfer1 KB
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution141ms
Transfer177 KB
Unused42%
Monthly Cost€2/mo
cookie.bestfreecdn.com
Other
Optional
Execution107ms
Transfer101 KB
Unused87%
Monthly Cost€1/mo
cdn.prod.website-files.com
Other
Optional
Execution53ms
Transfer21 KB
Monthly Cost€1/mo
59% 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
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.