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
40 images, 0 KB saveable
REVIEW
40 images, 0 KB saveable
Warning::
!
https://www.banktrack.org/thumbimage.php?image=sim... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=am_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=eur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=mos... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=fai... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/assets/site_images/bthea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=128... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=102... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=lan... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/assets/site_images/bt-ta... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=unt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=scr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=fro... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=hum... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=unt... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=ter... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=cli... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=nat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=lan... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=eer... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=scr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=190... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.banktrack.org/thumbimage.php?image=sim... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
40images4.3 MB
0oversized-0 KB
40legacy format
23missing 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
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.
B
JavaScript Blocking
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
!
18 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
2 fonts (29 KB)
PASS
2 fonts (29 KB)
Info::
i
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
29 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
6xK3dSBYKcSV-LCoeQqfX1R...woff2swap
Size15 KB
Load time18 ms
Start1.9 s
RiskFOUT — text flashes from fallback to web font
6xKydSBYKcSV-LCoeQqfX1R...woff2swap
Size14 KB
Load time18 ms
Start2.0 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
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: Transip
Network Waterfall
80 requests over 3112ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
75%of JavaScript execution is third-party
First-party Third-party2022ms · 328KB · €22/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.banktrack.org
www.banktrack.org
Other
867ms
33 KB
—
€9/mo
Costly
www.banktrack.org
www.banktrack.org
Other
640ms
17 KB
—
€7/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
286ms
173 KB
56%
€3/mo
Costly
maps.google.com
maps.google.com
Other
172ms
101 KB
64%
€2/mo
Optional
www.banktrack.org
www.banktrack.org
Other
57ms
5 KB
—
€1/mo
Optional
www.banktrack.org
Other
Costly
Execution867ms
Transfer33 KB
Monthly Cost€9/mo
www.banktrack.org
Other
Costly
Execution640ms
Transfer17 KB
Monthly Cost€7/mo
Google Tag Manager
Tag Manager
Costly
Execution286ms
Transfer173 KB
Unused56%
Monthly Cost€3/mo
maps.google.com
Other
Optional
Execution172ms
Transfer101 KB
Unused64%
Monthly Cost€2/mo
www.banktrack.org
Other
Optional
Execution57ms
Transfer5 KB
Monthly Cost€1/mo
These scripts may cost more than they're worth
www.banktrack.org adds 867ms and costs ~€9/month
www.banktrack.org adds 640ms and costs ~€7/month
Google Tag Manager adds 286ms and costs ~€3/month
75% 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.banktrack.org takes 867ms 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.banktrack.org takes 640ms 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 286ms 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
56% 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
64% of maps.google.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.