https://look-4.com.au
Performance
· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
94
GRADE
A
FIX
1
REVIEW
4
PASS
14
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
100
100
100
100
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
382 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
659 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
779 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
659 ms
Page Load Progression
Checks
2214 PASS 4 REVIEW 1 FIX
FHTTP CachingActionNo cache headersFIX
HTTP Caching
ActionNo cache headers
No cache headers
Warning::
No Cache-Control header found
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.
BJS Bundles19 scripts, 67 KB unusedREVIEW
JS Bundles
19 scripts, 67 KB unused
19 scripts, 67 KB unused
Warning::
https://look-4.com.au/assets/index-JnU8lGhS.js: 35 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://look-4.com.au/assets/base44-vendor-CiQEY8l...: 33 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 67 KB
67 KB unused JavaScript
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://look-4.com.au/assets/index-JnU8lGhS.js | 95 KB | 35 KB (37%) | ✓ | 1st |
| https://look-4.com.au/assets/base44-vendor-CiQEY8ld.js | 49 KB | 33 KB (68%) | ✓ | 1st |
| https://look-4.com.au/assets/CompanyShowcase-5GY-Cfzs.js | 2 KB | — | ✓ | 1st |
| https://look-4.com.au/assets/CoursePrice-CcYb45E4.js | 1 KB | — | ✓ | 1st |
| https://look-4.com.au/assets/route-preload-C50p-6WN.js | 1 KB | — | ✓ | 1st |
| https://look-4.com.au/assets/query-vendor-ByN4XpjD.js | 12 KB | — | ✓ | 1st |
| https://look-4.com.au/assets/home-data-9Vw3Ggas.js | 5 KB | — | ✓ | 1st |
| https://look-4.com.au/assets/Home-CkPLhyKL.js | 7 KB | — | ✓ | 1st |
| https://look-4.com.au/consent-defaults.js | 0 KB | — | ✓ | 1st |
| https://look-4.com.au/assets/icons-vendor-CzQWinoS.js | 12 KB | — | ✗ | 1st |
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
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
Main HTML Cache-Control
No Cache-Control header on main HTML response
No Cache-Control header on main HTML response
Info::
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.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Page Weight Budget480 KB transferred, 42 requestsPASS
Page Weight Budget
480 KB transferred, 42 requests
480 KB transferred, 42 requests
Info::
Page weighs 1.5 MB (480 KB transferred)
Info::
42 HTTP requests
Info::
Estimated 0.10 g CO2 per page load
480 KB transferred
42 requests
0.10 g CO2 per page load
JavaScript 256.1 KiB 53%
Images 86.3 KiB 18%
Fonts 80.5 KiB 17%
CSS 41.3 KiB 9%
Other 8.9 KiB 2%
HTML 6.1 KiB 1%
Other 606 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget
A+Third-Party Impact9% third-party, 0 ms blockingPASS
Third-Party Impact
9% third-party, 0 ms blocking
9% third-party, 0 ms blocking
Info::
Third-party code accounts for 9% of page weight (43.3 KiB of 479.7 KiB)
Info::
Third-party blocking time is low (0 ms)
91%
First-party Third-party
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Image Optimization7 images, 0 KB saveablePASS
Image Optimization
7 images, 0 KB saveable
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 86 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+JS Execution Cost343ms total JS executionPASS
JS Execution Cost
343ms total JS execution
343ms total JS execution
Info::
https://look-4.com.au/: 127ms CPU time
Info::
Unattributable: 117ms CPU time
Info::
https://look-4.com.au/assets/react-vendor-qdpgg10H...: 100ms CPU time
Main Thread Breakdown
Other 40% Script Evaluation 34% Style & Layout 20% Rendering 4%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://look-4.com.au/ | 127ms | 17ms | 1ms | 1st |
| Unattributable | 117ms | 2ms | 0ms | 1st |
| https://look-4.com.au/assets/react-vendor-qdpgg10H.js | 100ms | 83ms | 0ms | 1st |
A+Font Loading2 fonts (80 KB)PASS
Font Loading
2 fonts (80 KB)
2 fonts (80 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
2
80 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
Transfer FOIT (block) FOUT (swap)
sora-latin-wght-normal-... woff2 swap
Size 33 KB
Load time 17 ms
Start 293 ms
Risk FOUT — text flashes from fallback to web font
inter-latin-wght-normal... woff2 swap
Size 47 KB
Load time 14 ms
Start 293 ms
Risk FOUT — 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 CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
A+HTTP/3 (QUIC)HTTP/3 advertised via Alt-SvcPASS
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
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+Document CompressionDocument response uses brotliPASS
Document Compression
Document response uses brotli
Document response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
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::
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+Page Weight Inventory42 resources · 480 KB · 67 KB savings availablePASS
Page Weight Inventory
42 resources · 480 KB · 67 KB savings available
42 resources · 480 KB · 67 KB savings available
Info::
Within 1MB page-weight target
Got: 480 KB
Info::
~67 KB of savings available
Info::
3 third-party resources (9% of weight)
42 resources · 479.7 KiB · 3 third-party Within 1MB page-weight target
JavaScript 53% · 256.1 KiB
Image 18% · 86.3 KiB
Font 17% · 80.5 KiB
CSS 9% · 41.3 KiB
Other 2% · 9.5 KiB
Document 1% · 6.1 KiB
~67.4 KiB of savings available
Remove unused JavaScript: 67.4 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 42 resources | 479.7 KiB | ||||||
Asset CompressionNo text asset hosts to measureINFO
Asset Compression
No text asset hosts to measure
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall42 requests over 1115msINFO
Network Waterfall
42 requests over 1115ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Image Optimization8 images, 33 KB total, 0 KB wastedINFO
Image Optimization
8 images, 33 KB total, 0 KB wasted
Image Optimization Audit
Total Images
8
Total Size
33 KB
1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.