Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

100

Accessibility

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

480 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

789 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.

0.410

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.25 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

800 ms

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

14 PASS 4 REVIEW 1 FIX

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

JS Bundles

19 scripts, 73 KB unused

REVIEW

19 scripts, 73 KB unused

https://look-4.com.au/assets/index-C7Zg4QkX.js: 40 KB unused (40%)

Consider code splitting or tree shaking to reduce unused code.

https://look-4.com.au/assets/base44-vendor-daInoY-...: 32 KB unused (67%)

Consider code splitting or tree shaking to reduce unused code.

https://look-4.com.au/assets/icons-vendor-DGaMEwrZ...: unminified — 5 KB could be saved

Total unused JavaScript: 73 KB

73 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://look-4.com.au/assets/index-C7Zg4QkX.js	101 KB	40 KB (40%)	✓	1st
https://look-4.com.au/assets/base44-vendor-daInoY-L.js	49 KB	32 KB (67%)	✓	1st
https://look-4.com.au/assets/home-preload-CGZHa2Ax.js	1 KB	—	✓	1st
https://look-4.com.au/assets/company-logos-6yFq6ahR.js	2 KB	—	✓	1st
https://look-4.com.au/assets/icons-vendor-DGaMEwrZ.js	12 KB	—	✗	1st
https://look-4.com.au/assets/query-vendor-ByN4XpjD.js	12 KB	—	✓	1st
https://look-4.com.au/consent-defaults.js	0 KB	—	✓	1st
https://look-4.com.au/assets/home-data-OFmgh_8d.js	5 KB	—	✓	1st
https://look-4.com.au/assets/route-preload-CCt9giPk.js	1 KB	—	✓	1st
https://look-4.com.au/assets/Home-zN59F9U7.js	7 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

Main HTML Cache-Control

No Cache-Control header on main HTML response

REVIEW

No Cache-Control header on main HTML response

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.

Server-Timing Observability

No Server-Timing header found

REVIEW

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.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

615 KB transferred, 45 requests

PASS

615 KB transferred, 45 requests

Page weighs 1.6 MB (615 KB transferred)

45 HTTP requests

Estimated 0.13 g CO2 per page load

615 KB transferred

45 requests

0.13 g CO2 per page load

JavaScript 262.0 KiB 43%

Images 215.2 KiB 35%

Fonts 80.5 KiB 13%

CSS 41.3 KiB 7%

Other 8.9 KiB 1%

HTML 6.0 KiB 1%

Other 999 B 0%

Other 606 B 0%

0 2.4 MB 4.9 MB

Under budget

Third-Party Impact

32% third-party, 0 ms blocking

PASS

32% third-party, 0 ms blocking

Third-party code accounts for 32% of page weight (198.5 KiB of 615.4 KiB)

Third-party blocking time is low (0 ms)

68%

32%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Image Optimization

7 images, 0 KB saveable

PASS

7 images, 0 KB saveable

All images are well-optimized

7 images 215 KB

0 oversized -0 KB

1 legacy format

0 missing dimensions CLS risk

A+

JS Execution Cost

341ms total JS execution

PASS

341ms total JS execution

https://look-4.com.au/: 127ms CPU time

Unattributable: 124ms CPU time

https://look-4.com.au/assets/react-vendor-qdpgg10H...: 90ms CPU time

Main Thread Breakdown

Other 40% Script Evaluation 32% Style & Layout 20% Rendering 5%

Script	Total	Scripting	Parse/Compile	Party
https://look-4.com.au/	127ms	2ms	0ms	1st
Unattributable	124ms	15ms	0ms	1st
https://look-4.com.au/assets/react-vendor-qdpgg10H.js	90ms	75ms	0ms	1st

A+

Font Loading

2 fonts (81 KB)

PASS

2 fonts (81 KB)

2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

81 KB total

Render-blocking

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 482 ms

Start 295 ms

Risk FOUT — text flashes from fallback to web font

inter-latin-wght-normal... woff2 swap

Size 47 KB

Load time 27 ms

Start 296 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 Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

HTTP/3 (QUIC)

HTTP/3 advertised via Alt-Svc

PASS

HTTP/3 advertised via Alt-Svc

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 Compression

Document response uses brotli

PASS

Document response uses brotli

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 Preload

LCP preload audit not available

PASS

LCP preload audit not available

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

`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).

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 Inventory

45 resources · 615 KB · 73 KB savings available

PASS

45 resources · 615 KB · 73 KB savings available

Within 1MB page-weight target

Got: 615 KB

~73 KB of savings available

6 third-party resources (32% of weight)

45 resources · 615.4 KiB · 6 third-party Within 1MB page-weight target

JavaScript 43% · 262.0 KiB

Image 35% · 215.2 KiB

Font 13% · 80.5 KiB

CSS 7% · 41.3 KiB

Other 2% · 10.5 KiB

Document 1% · 6.0 KiB

~72.8 KiB of savings available

Remove unused JavaScript: 72.8 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

45 resources			615.4 KiB

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

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 Waterfall

45 requests over 2725ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

8 images, 33 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

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.