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
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/app-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/app-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.healthdirect.gov.au/assets/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24images1.9 MB
0oversized-0 KB
24legacy format
12missing 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
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
4 fonts (115 KB)
PASS
4 fonts (115 KB)
Info::
i
4 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
4
115 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
woff;base64,d09GRgABAAA...woffswap
Size38 KB
Load time31 ms
Start1.5 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
woff;base64,d09GRgABAAA...woffswap
Size22 KB
Load time31 ms
Start1.5 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
woff;base64,d09GRgABAAA...woffswap
Size22 KB
Load time21 ms
Start1.5 s
RiskFOUT — text flashes from fallback to web font
Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time16 ms
Start2.4 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 ~24 KB and ~48 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+
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
Network Waterfall
75 requests over 3409ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100%of JavaScript execution is third-party
First-party Third-party5826ms · 1792KB · A$155/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.gstatic.com
www.gstatic.com
Other
1077ms
0 KB
49%
A$29/mo
Costly
Unattributable
Unattributable
Other
1039ms
0 KB
—
A$28/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
999ms
185 KB
30%
A$27/mo
Costly
www.healthdirect.gov.au
www.healthdirect.gov.au
Other
550ms
58 KB
—
A$15/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
493ms
172 KB
39%
A$13/mo
Costly
analytics.tiktok.com
analytics.tiktok.com
Other
440ms
121 KB
49%
A$12/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
310ms
102 KB
24%
A$8/mo
Costly
Facebook Pixel
connect.facebook.net
Advertising
211ms
97 KB
37%
A$6/mo
Costly
www.healthdirect.gov.au
www.healthdirect.gov.au
Other
161ms
126 KB
55%
A$4/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
142ms
35 KB
—
A$4/mo
Optional
Google Tag Manager
www.googletagmanager.com
Tag Manager
140ms
144 KB
39%
A$4/mo
Optional
www.redditstatic.com
www.redditstatic.com
Other
77ms
19 KB
—
A$2/mo
Optional
analytics.tiktok.com
analytics.tiktok.com
Other
66ms
40 KB
—
A$2/mo
Optional
cdn-oc.readspeaker.com
cdn-oc.readspeaker.com
Other
65ms
28 KB
—
A$2/mo
Optional
www.healthdirect.gov.au
www.healthdirect.gov.au
Other
58ms
666 KB
—
A$2/mo
Optional
www.gstatic.com
Other
Costly
Execution1077ms
Transfer0 KB
Unused49%
Monthly CostA$29/mo
Unattributable
Other
Costly
Execution1039ms
Transfer0 KB
Monthly CostA$28/mo
Google Tag Manager
Tag Manager
Costly
Execution999ms
Transfer185 KB
Unused30%
Monthly CostA$27/mo
www.healthdirect.gov.au
Other
Costly
Execution550ms
Transfer58 KB
Monthly CostA$15/mo
Google Tag Manager
Tag Manager
Costly
Execution493ms
Transfer172 KB
Unused39%
Monthly CostA$13/mo
analytics.tiktok.com
Other
Costly
Execution440ms
Transfer121 KB
Unused49%
Monthly CostA$12/mo
Facebook Pixel
Advertising
Costly
Execution310ms
Transfer102 KB
Unused24%
Monthly CostA$8/mo
Facebook Pixel
Advertising
Costly
Execution211ms
Transfer97 KB
Unused37%
Monthly CostA$6/mo
www.healthdirect.gov.au
Other
Optional
Execution161ms
Transfer126 KB
Unused55%
Monthly CostA$4/mo
Facebook Pixel
Advertising
Optional
Execution142ms
Transfer35 KB
Monthly CostA$4/mo
Google Tag Manager
Tag Manager
Optional
Execution140ms
Transfer144 KB
Unused39%
Monthly CostA$4/mo
www.redditstatic.com
Other
Optional
Execution77ms
Transfer19 KB
Monthly CostA$2/mo
analytics.tiktok.com
Other
Optional
Execution66ms
Transfer40 KB
Monthly CostA$2/mo
cdn-oc.readspeaker.com
Other
Optional
Execution65ms
Transfer28 KB
Monthly CostA$2/mo
www.healthdirect.gov.au
Other
Optional
Execution58ms
Transfer666 KB
Monthly CostA$2/mo
These scripts may cost more than they're worth
www.gstatic.com adds 1077ms and costs ~A$29/month
Unattributable adds 1039ms and costs ~A$28/month
Google Tag Manager adds 999ms and costs ~A$27/month
www.healthdirect.gov.au adds 550ms and costs ~A$15/month
Google Tag Manager adds 493ms and costs ~A$13/month
analytics.tiktok.com adds 440ms and costs ~A$12/month
Facebook Pixel adds 310ms and costs ~A$8/month
Facebook Pixel adds 211ms and costs ~A$6/month
100% 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.gstatic.com takes 1077ms 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
Unattributable takes 1039ms 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 999ms 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.healthdirect.gov.au takes 550ms 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 493ms 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
analytics.tiktok.com takes 440ms 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
Facebook Pixel takes 310ms 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
Facebook Pixel takes 211ms 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
55% of www.healthdirect.gov.au'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.