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https://www.abc.net.au

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
3
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
69
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

537 ms

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

2.76 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

337 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.026

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

1.34 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.

4.00 s

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
6 PASS 3 REVIEW 3 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 176 requests
FIX
4.1 MB transferred, 176 requests
Critical::
Page weighs 8.7 MB (4.1 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Warning::
176 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.86 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
176 requests
0.86 g CO2 per page load
Images 2.2 MiB 54%
JavaScript 1.4 MiB 34%
HTML 235.2 KiB 6%
CSS 134.6 KiB 3%
Fonts 78.0 KiB 2%
Other 18.6 KiB 0%
Other 4.7 KiB 0%
Other 2.9 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
72% third-party, 0 ms blocking
FIX
72% third-party, 0 ms blocking
Warning::
Third-party code accounts for 72% of page weight (3.0 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
28%
72%
First-party Third-party
F
JS Bundles
Action
61 scripts, 522 KB unused
FIX
61 scripts, 522 KB unused
Warning::
https://login.abc.net.au/js/gigya.js?apikey=3_fA1l...: 137 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NZ6...: 72 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.abc.net.au/news-web/_next/static/chunk...: 63 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.abc.net.au/news-web/_next/static/chunk...: 61 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.abc.net.au/news-web/_next/static/chunk...: 36 KB unused (97%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 522 KB
522 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://login.abc.net.au/js/gigya.js?apikey=3_fA1lYde7bHFw4kAQ_VLT37l-OacxV6xOkYAn0KOPFjrXyrlrovPpV1toELQLABDp239 KB137 KB (58%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NZ6NQM6F185 KB72 KB (39%)✓3rd
https://www.abc.net.au/news-web/_next/static/chunks/464a22fe-d8a7a6e9ffdfc9c4.js98 KB63 KB (65%)✓1st
https://www.abc.net.au/news-web/_next/static/chunks/pages/_app-ee0c3be25bf60a06.js137 KB61 KB (45%)✓1st
https://www.abc.net.au/news-web/_next/static/chunks/de806afc-ff86fb48e79c66ff.js38 KB36 KB (97%)✓1st
https://www.abc.net.au/news-web/_next/static/chunks/773-68a625ac968832e2.js51 KB32 KB (65%)✓1st
https://www.abc.net.au/news-web/_next/static/chunks/main-f8430302b7586c39.js48 KB28 KB (60%)✓1st
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.abc.net.au36 KB28 KB (77%)✓3rd
https://www.abc.net.au/news-web/_next/static/chunks/7314-92fe9a6e72882682.js46 KB23 KB (51%)✓1st
https://au-script.dotmetrics.net/Scripts/script.js?v=36228 KB21 KB (75%)✓3rd

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

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

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

C
Image Optimization
Action
84 images, 0 KB saveable
REVIEW
84 images, 0 KB saveable
Warning::
https://live-production.wcms.abc-cdn.net.au/f52a9c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://live-production.wcms.abc-cdn.net.au/a1ffb4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
84 images 2.2 MB
0 oversized -0 KB
5 legacy format
2 missing dimensions CLS 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

C
JS Execution Cost
Action
1972ms total JS execution
REVIEW
1972ms total JS execution
Warning::
https://www.abc.net.au/news-web/_next/static/chunk...: 640ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NZ6...: 375ms CPU time
Warning::
https://www.abc.net.au/: 315ms CPU time
Warning::
Unattributable: 258ms CPU time
Info::
https://login.abc.net.au/js/gigya.js?apikey=3_fA1l...: 125ms CPU time
Info::
Third-party scripts: 809ms (41% of total)

Main Thread Breakdown

Script Evaluation 58% Style & Layout 15% Other 15% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.abc.net.au/news-web/_next/static/chunks/framework-4a602498427f98ac.js640ms496ms6ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-NZ6NQM6F375ms343ms18ms3rd
https://www.abc.net.au/315ms20ms1ms1st
Unattributable258ms2ms0ms3rd
https://login.abc.net.au/js/gigya.js?apikey=3_fA1lYde7bHFw4kAQ_VLT37l-OacxV6xOkYAn0KOPFjrXyrlrovPpV1toELQLABDp125ms97ms26ms3rd
https://www.abc.net.au/news-web/_next/static/chunks/pages/index-7c4e201de3ff7196.js114ms114ms0ms1st
https://www.abc.net.au/news-web/_next/static/chunks/pages/_app-ee0c3be25bf60a06.js95ms39ms8ms1st
https://login.abc.net.au/js/sso.htm?APIKey=3_DHeg1ce5-HbfRNLEbQs6kLcA5kfRcyCq-3o7EJJgM8qCyMJzLQeqGmgeiuQJzD8b&ssoSegment=&version=latest&build=1535&flavor=base&sourceKey=3_fA1lYde7bHFw4kAQ_VLT37l-OacxV6xOkYAn0KOPFjrXyrlrovPpV1toELQLABDp51ms49ms0ms3rd
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
5 fonts (78 KB)
PASS
5 fonts (78 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

78 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 537 ms LCP 2.8 shttps://static.abc-cdn.net.au/fonts/abcsansnova/20211112/abcsansnova-regular.woff2abcsansnova-regular.woff2 https://static.abc-cdn.net.au/fonts/abcsansnova/20211112/abcsansnova-regular.woff2 — 13.1 KiB — 0 ms — font-display: swaphttps://static.abc-cdn.net.au/fonts/abcsansnova/20211112/abcsansnova-bold.woff2abcsansnova-bold.woff2 https://static.abc-cdn.net.au/fonts/abcsansnova/20211112/abcsansnova-bold.woff2 — 12.6 KiB — 0 ms — font-display: swaphttps://static.abc-cdn.net.au/fonts/abcsansnova/20211112/abcsansnova-black.woff2abcsansnova-black.woff2 https://static.abc-cdn.net.au/fonts/abcsansnova/20211112/abcsansnova-black.woff2 — 13.1 KiB — 0 ms — font-display: swaphttps://static.abc-cdn.net.au/fonts/abcserif/abcserif-bold.woff2abcserif-bold.woff2 https://static.abc-cdn.net.au/fonts/abcserif/abcserif-bold.woff2 — 19.4 KiB — 0 ms — font-display: swaphttps://static.abc-cdn.net.au/fonts/abcserif/abcserif-regular.woff2abcserif-regular.woff2 https://static.abc-cdn.net.au/fonts/abcserif/abcserif-regular.woff2 — 19.8 KiB — 0 ms — font-display: swap
abcsansnova-regular.woff2 woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
abcsansnova-bold.woff2 woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
abcsansnova-black.woff2 woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
abcserif-bold.woff2 woff2 swap
Size 19 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
abcserif-regular.woff2 woff2 swap
Size 20 KB
Load time 0 ms
Start 0 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
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+
HTTP Caching
max-age=34 (34 seconds)
PASS
max-age=34 (34 seconds)
Info::
Cache-Control header is set
Got: public, max-age=34
Info::
Effective TTL: 34 seconds (max-age=34)
Info::
ETag present — enables conditional (304) responses
Cache-Control

public, max-age=34

DirectiveValueMeaning
public—Any cache may store this response
max-age34Cache for 34 seconds
Effective TTL: 34 seconds
Network Waterfall
176 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
41% of JavaScript execution is third-party
First-party Third-party 809ms · 424KB · A$14/mo
Google Tag Manager
Tag Manager
Costly
Execution 375ms
Transfer 185 KB
Unused 39%
Monthly Cost A$6/mo
Unattributable
Other
Costly
Execution 258ms
Transfer 0 KB
Monthly Cost A$4/mo
login.abc.net.au
Other
Optional
Execution 125ms
Transfer 239 KB
Unused 58%
Monthly Cost A$2/mo
login.abc.net.au
Other
Optional
Execution 51ms
Transfer 0 KB
Monthly Cost A$1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 375ms and costs ~A$6/month
  • Unattributable adds 258ms and costs ~A$4/month

41% 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

Google Tag Manager takes 375ms 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 258ms 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

58% of login.abc.net.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.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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