Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
C
Image Optimization
Action
44 images, 0 KB saveable
REVIEW
44 images, 0 KB saveable
Warning::
!
https://aro.tech/wp-content/uploads/2026/04/Gleeds... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2025/08/Barrac... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2025/12/X_logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2026/04/liverp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2026/04/Gamma-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2026/04/Trace-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2024/01/Extrem... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2024/01/dell-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2025/09/WatchG... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2026/04/BAT-Lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2025/12/facebo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2025/12/linked... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2024/02/Wildix... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2026/04/Micros... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2025/12/youtub... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2026/04/Hodge-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://aro.tech/wp-content/uploads/2025/11/Aruba-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://staging5.aro.tech/wp-content/uploads/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
44images632 KB
0oversized-0 KB
19legacy format
18missing 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
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
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.
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
13 fonts (170 KB)
PASS
13 fonts (170 KB)
Info::
i
13 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
13
170 KB total
Render-blocking
0
of 13
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
i7dOIFdwYjGaAMFtZd_QA1Z...woff2swap
Size31 KB
Load time138 ms
Start898 ms
RiskFOUT — text flashes from fallback to web font
EJRSQgYoZZY2vCFuvAnt66q...woff2swap
Size13 KB
Load time118 ms
Start898 ms
RiskFOUT — text flashes from fallback to web font
EJRVQgYoZZY2vCFuvAFWzr-...woff2swap
Size13 KB
Load time36 ms
Start1.1 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size11 KB
Load time20 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size12 KB
Load time15 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size12 KB
Load time15 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size11 KB
Load time16 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size12 KB
Load time24 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size11 KB
Load time25 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size12 KB
Load time25 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size11 KB
Load time25 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size12 KB
Load time25 ms
Start1.2 s
RiskFOUT — text flashes from fallback to web font
lwoff2swap
Size11 KB
Load time26 ms
Start1.2 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)
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+
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.
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
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
!
1 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+
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
138 requests over 4935ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
67%of JavaScript execution is third-party
First-party Third-party2279ms · 1084KB · €25/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
Unattributable
Unattributable
Other
561ms
0 KB
—
€6/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
333ms
179 KB
38%
€4/mo
Costly
app.termly.io
app.termly.io
Other
297ms
144 KB
38%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
252ms
174 KB
39%
€3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
210ms
156 KB
46%
€2/mo
Costly
Tawk.to
embed.tawk.to
Chat
176ms
114 KB
69%
€2/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
149ms
145 KB
49%
€2/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
108ms
97 KB
38%
€1/mo
Optional
cxppgbr1rdrect01sa02cdn-endpoint.azureedge.net
cxppgbr1rdrect01sa02cdn-endpoint.azureedge.net
Other
72ms
32 KB
—
€1/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
68ms
23 KB
—
€1/mo
Optional
LinkedIn Insight
snap.licdn.com
Advertising
53ms
19 KB
—
€1/mo
Optional
Unattributable
Other
Costly
Execution561ms
Transfer0 KB
Monthly Cost€6/mo
Google Tag Manager
Tag Manager
Costly
Execution333ms
Transfer179 KB
Unused38%
Monthly Cost€4/mo
app.termly.io
Other
Costly
Execution297ms
Transfer144 KB
Unused38%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution252ms
Transfer174 KB
Unused39%
Monthly Cost€3/mo
Google Tag Manager
Tag Manager
Costly
Execution210ms
Transfer156 KB
Unused46%
Monthly Cost€2/mo
Tawk.to
Chat
Optional
Execution176ms
Transfer114 KB
Unused69%
Monthly Cost€2/mo
Google Tag Manager
Tag Manager
Optional
Execution149ms
Transfer145 KB
Unused49%
Monthly Cost€2/mo
Facebook Pixel
Advertising
Optional
Execution108ms
Transfer97 KB
Unused38%
Monthly Cost€1/mo
cxppgbr1rdrect01sa02cdn-endpoint.azureedge.net
Other
Optional
Execution72ms
Transfer32 KB
Monthly Cost€1/mo
Facebook Pixel
Advertising
Optional
Execution68ms
Transfer23 KB
Monthly Cost€1/mo
LinkedIn Insight
Advertising
Optional
Execution53ms
Transfer19 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
Unattributable adds 561ms and costs ~€6/month
Google Tag Manager adds 333ms and costs ~€4/month
app.termly.io adds 297ms and costs ~€3/month
Google Tag Manager adds 252ms and costs ~€3/month
Google Tag Manager adds 210ms and costs ~€2/month
67% 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
Unattributable takes 561ms 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
Google Tag Manager takes 333ms 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
app.termly.io takes 297ms 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
Google Tag Manager takes 252ms 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
Google Tag Manager takes 210ms 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 Tawk.to'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.