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
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
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.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
i
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
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 4.3 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
3 fonts (91 KB)
PASS
3 fonts (91 KB)
Info::
i
3 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
3
91 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
tradegothichornbach-bol...woff2swap
Size21 KB
Load time16 ms
Start121 ms
RiskFOUT — text flashes from fallback to web font
badhousehornbach-bold-w...woff2swap
Size44 KB
Load time25 ms
Start122 ms
RiskFOUT — text flashes from fallback to web font
tradegothichornbach-202...woff2swap
Size26 KB
Load time27 ms
Start122 ms
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
15 hints, 0 missing preconnects
PASS
15 hints, 0 missing preconnects
Info::
i
6 dns-prefetch redundant with preconnect on same origin
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://www.googletagmanager.com, https://www.googleadservices.com, https://googleads.g.doubleclick.net (+3 more). Remove the redundant dns-prefetch entries.
Info::
i
6 URL(s) appear in multiple hints
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: //www.google.com (dns-prefetch+preconnect), //www.googletagmanager.com (dns-prefetch+preconnect), //www.googleadservices.com (dns-prefetch+preconnect) (+3 more).
Info::
✓
Page uses 15 resource hint(s)
Current Resource Hints
preconnect
6
preload
3
dns-prefetch
6
prefetch—
15 resource hints configured
preconnect already does the DNS lookup; adding dns-prefetch to the same origin is at best a no-op. Sample: https://www.googletagmanager.com, https://www.googleadservices.com, https://googleads.g.doubleclick.net (+3 more). Remove the redundant dns-prefetch entries.
Why this matters
Performance issues directly impact user engagement and conversion rates.
The same href shouldn't appear in multiple hint rels -- one wins, the others are wasted markup and may confuse cache behavior. Sample: //www.google.com (dns-prefetch+preconnect), //www.googletagmanager.com (dns-prefetch+preconnect), //www.googleadservices.com (dns-prefetch+preconnect) (+3 more).
Why this matters
Performance issues directly impact user engagement and conversion rates.
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
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
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.
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.
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Axis12 Ltd
Network Waterfall
124 requests over 3084ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100%of JavaScript execution is third-party
First-party Third-party4329ms · 604KB · €20/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.hornbach.de
www.hornbach.de
Other
1024ms
115 KB
—
€5/mo
Costly
dok.js-cdn.dynatrace.com
dok.js-cdn.dynatrace.com
Other
813ms
131 KB
46%
€4/mo
Costly
Unattributable
Unattributable
Other
718ms
0 KB
—
€3/mo
Costly
www.hornbach.de
www.hornbach.de
Other
593ms
14 KB
—
€3/mo
Costly
www.hornbach.de
www.hornbach.de
Other
314ms
69 KB
47%
€1/mo
Costly
ti.hornbach.de
ti.hornbach.de
Other
289ms
56 KB
41%
€1/mo
Costly
web.cmp.usercentrics.eu
web.cmp.usercentrics.eu
Other
143ms
56 KB
63%
€1/mo
Optional
www.hornbach.de
www.hornbach.de
Other
95ms
38 KB
68%
€0/mo
Optional
www.hornbach.de
www.hornbach.de
Other
89ms
55 KB
—
€0/mo
Optional
web.cmp.usercentrics.eu
web.cmp.usercentrics.eu
Other
71ms
18 KB
—
€0/mo
Optional
www.hornbach.de
www.hornbach.de
Other
63ms
15 KB
—
€0/mo
Optional
cdn.mateti.net
cdn.mateti.net
Other
61ms
35 KB
79%
€0/mo
Optional
web.cmp.usercentrics.eu
web.cmp.usercentrics.eu
Other
55ms
1 KB
—
€0/mo
Optional
www.hornbach.de
Other
Costly
Execution1024ms
Transfer115 KB
Monthly Cost€5/mo
dok.js-cdn.dynatrace.com
Other
Costly
Execution813ms
Transfer131 KB
Unused46%
Monthly Cost€4/mo
Unattributable
Other
Costly
Execution718ms
Transfer0 KB
Monthly Cost€3/mo
www.hornbach.de
Other
Costly
Execution593ms
Transfer14 KB
Monthly Cost€3/mo
www.hornbach.de
Other
Costly
Execution314ms
Transfer69 KB
Unused47%
Monthly Cost€1/mo
ti.hornbach.de
Other
Costly
Execution289ms
Transfer56 KB
Unused41%
Monthly Cost€1/mo
web.cmp.usercentrics.eu
Other
Optional
Execution143ms
Transfer56 KB
Unused63%
Monthly Cost€1/mo
www.hornbach.de
Other
Optional
Execution95ms
Transfer38 KB
Unused68%
Monthly Cost€0/mo
www.hornbach.de
Other
Optional
Execution89ms
Transfer55 KB
Monthly Cost€0/mo
web.cmp.usercentrics.eu
Other
Optional
Execution71ms
Transfer18 KB
Monthly Cost€0/mo
www.hornbach.de
Other
Optional
Execution63ms
Transfer15 KB
Monthly Cost€0/mo
cdn.mateti.net
Other
Optional
Execution61ms
Transfer35 KB
Unused79%
Monthly Cost€0/mo
web.cmp.usercentrics.eu
Other
Optional
Execution55ms
Transfer1 KB
Monthly Cost€0/mo
These scripts may cost more than they're worth
www.hornbach.de adds 1024ms and costs ~€5/month
dok.js-cdn.dynatrace.com adds 813ms and costs ~€4/month
Unattributable adds 718ms and costs ~€3/month
www.hornbach.de adds 593ms and costs ~€3/month
www.hornbach.de adds 314ms and costs ~€1/month
ti.hornbach.de adds 289ms and costs ~€1/month
100% 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
www.hornbach.de takes 1024ms 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
dok.js-cdn.dynatrace.com takes 813ms 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
Unattributable takes 718ms 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
www.hornbach.de takes 593ms 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
www.hornbach.de takes 314ms 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
ti.hornbach.de takes 289ms 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
63% of web.cmp.usercentrics.eu'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
68% of www.hornbach.de'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 cdn.mateti.net'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.