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.
B
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
REVIEW
Main 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
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::
!
12 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 3.9 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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW
Green Hosting
No green hosting detected
A
Page Weight Budget
1.0 MB transferred, 56 requests
PASS
1.0 MB transferred, 56 requests
Info::
✓
Page weighs 2.3 MB (1.0 MB transferred)
Info::
i
56 HTTP requests
Info::
i
Estimated 0.21 g CO2 per page load
1.0 MBtransferred
56 requests
0.21 g CO2 per page load
JavaScript480.9 KiB46%
Images239.0 KiB23%
Fonts166.9 KiB16%
CSS70.0 KiB7%
HTML54.6 KiB5%
Other16.4 KiB2%
Other13.5 KiB1%
Other40 B0%
02.4 MB4.9 MB
Under budget
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
6 fonts (167 KB)
PASS
6 fonts (167 KB)
Info::
i
6 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
6
167 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
6xK3dSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time18 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time36 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
fontawesome-webfont.woffwoffswap
Size82 KB
Load time97 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
6xK1dSBYKcSV-LCoeQqfX1R...woff2swap
Size14 KB
Load time36 ms
Start1.7 s
RiskFOUT — text flashes from fallback to web font
4Ua_rENHsxJlGDuGo1OIlJf...woff2swap
Size21 KB
Load time9 ms
Start2.5 s
RiskFOUT — text flashes from fallback to web font
4Ua_rENHsxJlGDuGo1OIlJf...woff2swap
Size21 KB
Load time11 ms
Start2.5 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 ~25 KB and ~50 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
No optimization needed
PASS
No optimization needed
Info::
✓
No resource hint issues
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+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
✓
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-store, no-cache, must-revalidate
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.
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.
Network Waterfall
56 requests over 3519ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
53%of JavaScript execution is third-party
First-party Third-party2079ms · 341KB · €23/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
pagead2.googlesyndication.com
pagead2.googlesyndication.com
Other
1054ms
165 KB
70%
€11/mo
Costly
pagead2.googlesyndication.com
pagead2.googlesyndication.com
Other
345ms
54 KB
46%
€4/mo
Costly
code.jquery.com
code.jquery.com
Other
321ms
32 KB
—
€3/mo
Costly
ajax.googleapis.com
ajax.googleapis.com
Other
137ms
33 KB
69%
€1/mo
Optional
Google Analytics
www.google-analytics.com
Analytics
88ms
21 KB
—
€1/mo
Optional
cdnjs
cdnjs.cloudflare.com
CDN
73ms
28 KB
88%
€1/mo
Optional
ep2.adtrafficquality.google
ep2.adtrafficquality.google
Other
60ms
8 KB
—
€1/mo
Optional
pagead2.googlesyndication.com
Other
Costly
Execution1054ms
Transfer165 KB
Unused70%
Monthly Cost€11/mo
pagead2.googlesyndication.com
Other
Costly
Execution345ms
Transfer54 KB
Unused46%
Monthly Cost€4/mo
code.jquery.com
Other
Costly
Execution321ms
Transfer32 KB
Monthly Cost€3/mo
ajax.googleapis.com
Other
Optional
Execution137ms
Transfer33 KB
Unused69%
Monthly Cost€1/mo
Google Analytics
Analytics
Optional
Execution88ms
Transfer21 KB
Monthly Cost€1/mo
cdnjs
CDN
Optional
Execution73ms
Transfer28 KB
Unused88%
Monthly Cost€1/mo
ep2.adtrafficquality.google
Other
Optional
Execution60ms
Transfer8 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
pagead2.googlesyndication.com adds 1054ms and costs ~€11/month
pagead2.googlesyndication.com adds 345ms and costs ~€4/month
code.jquery.com adds 321ms and costs ~€3/month
53% 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
pagead2.googlesyndication.com takes 1054ms 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
70% of pagead2.googlesyndication.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
pagead2.googlesyndication.com takes 345ms 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
code.jquery.com takes 321ms 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
69% of ajax.googleapis.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
88% of cdnjs'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.