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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

43
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

6.88 s

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

7.78 s

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

560 ms

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

0.005

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

9.32 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.

16.72 s

Page Load Progression

650 ms
1.3 s
2.0 s
2.6 s
3.3 s
3.9 s
4.6 s
5.2 s
Checks
17
7 PASS 2 REVIEW 6 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 82 requests
FIX
2.5 MB transferred, 82 requests
Warning::
Page weighs 8.5 MB (2.5 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
82 HTTP requests
Info::
Estimated 0.53 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
82 requests
0.53 g CO2 per page load
JavaScript 1.2 MiB 47%
Images 958.6 KiB 37%
Fonts 155.0 KiB 6%
Other 152.8 KiB 6%
CSS 85.1 KiB 3%
HTML 12.8 KiB 0%
Other 2.6 KiB 0%
Other 2.4 KiB 0%
Other 355 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.5 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3438ms total JS execution
FIX
3438ms total JS execution
Warning::
https://www.sydney.edu.au/etc.clientlibs/corporate...: 712ms CPU time
Warning::
Unattributable: 625ms CPU time
Warning::
https://assets.adobedtm.com/84fa4ed6cd2d/93f43475a...: 561ms CPU time
Warning::
https://www.sydney.edu.au/etc.clientlibs/corporate...: 534ms CPU time
Warning::
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketc...: 465ms CPU time
Warning::
Third-party scripts: 3438ms (100% of total)

Main Thread Breakdown

Script Evaluation 57% Other 17% Script Parsing & Compilation 10% Style & Layout 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-js.982a02b02f679df8eafac1b6a6e4fc85.js712ms449ms65ms3rd
Unattributable625ms175ms0ms3rd
https://assets.adobedtm.com/84fa4ed6cd2d/93f43475a61e/launch-a9ab0e6066cc.min.js561ms481ms56ms3rd
https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-chunk-all-components-frontend-svelte-js.b9124dec.js534ms372ms87ms3rd
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js465ms334ms120ms3rd
https://www.sydney.edu.au/397ms14ms1ms3rd
https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-commons-core-js.deaf12db4cf945a0ca13edc97fde1c59.js80ms73ms7ms3rd
https://www.sydney.edu.au/etc.clientlibs/core/wcm/components/commons/datalayer/v1/clientlibs/core.wcm.components.commons.datalayer.v1.26e7b73e6dfd6225be931b9e9b1e405d.js63ms54ms3ms3rd
F
JS Bundles
Action
20 scripts, 718 KB unused
FIX
20 scripts, 718 KB unused
Warning::
https://www.sydney.edu.au/etc.clientlibs/corporate...: 242 KB unused (95%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sydney.edu.au/etc.clientlibs/corporate...: 166 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.sydney.edu.au/etc.clientlibs/corporate...: unminified — 48 KB could be saved
Warning::
https://www.sydney.edu.au/etc.clientlibs/corporate...: 154 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketc...: 118 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/84fa4ed6cd2d/93f43475a...: 38 KB unused (27%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 718 KB
718 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-chunk-all-components-frontend-svelte-js.b9124dec.js256 KB242 KB (95%)3rd
https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-search.a6e2a76740ba945a80caac9d44ea5e22.js216 KB166 KB (77%)3rd
https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-js.982a02b02f679df8eafac1b6a6e4fc85.js219 KB154 KB (71%)3rd
https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js259 KB118 KB (46%)3rd
https://assets.adobedtm.com/84fa4ed6cd2d/93f43475a61e/launch-a9ab0e6066cc.min.js141 KB38 KB (27%)3rd
https://static.cloud.coveo.com/atomic/v3.13/p-5925f187.js9 KB3rd
https://assets.adobedtm.com/84fa4ed6cd2d/93f43475a61e/1b92f2c336d5/RCea9381b0ac404a00a8238e248fa1f4ef-source.min.js0 KB3rd
https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-commons-core-js.deaf12db4cf945a0ca13edc97fde1c59.js18 KB3rd
https://www.sydney.edu.au/etc.clientlibs/core/wcm/components/commons/datalayer/v1/clientlibs/core.wcm.components.commons.datalayer.v1.26e7b73e6dfd6225be931b9e9b1e405d.js14 KB3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js13 KB3rd

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

F
Page Weight Inventory
Action
82 resources · 2.5 MB · 718 KB savings available
FIX
82 resources · 2.5 MB · 718 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~718 KB of savings available
Warning::
81 third-party resources (100% of weight)
Info::
6 resources over 200KB
82 resources · 2.5 MiB · 81 third-party 1.5 MiB over 1MB target
JavaScript 47% · 1.2 MiB
Image 38% · 984.4 KiB
Font 6% · 155.0 KiB
Other 5% · 131.6 KiB
CSS 3% · 85.1 KiB
Document 1% · 13.0 KiB

~717.7 KiB of savings available

Remove unused JavaScript: 717.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
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.

C
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://www.sydney.edu.au/content/dam/icons/logos/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://global.ketchcdn.com/web/v2/assetsv1/orgs/u... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 959 KB
0 oversized -0 KB
10 legacy format
3 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

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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 (155 KB)
PASS
5 fonts (155 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

155 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 6.9 s LCP 7.8 shttps://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/Apercu-Regular-Web.woff2Apercu-Regular-Web.woff2 https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/Apercu-Regular-Web.woff2 — 27.3 KiB — 337 ms — font-display: swaphttps://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/Apercu-Medium-Web.woff2Apercu-Medium-Web.woff2 https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/Apercu-Medium-Web.woff2 — 28.4 KiB — 319 ms — font-display: swaphttps://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/LyonDisplayLF-Regular-Web.woff2LyonDisplayLF-Regular-W... https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/LyonDisplayLF-Regular-Web.woff2 — 33.0 KiB — 325 ms — font-display: swaphttps://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/LyonDisplayLF-RegularItalic-Web.woff2LyonDisplayLF-RegularIt... https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/LyonDisplayLF-RegularItalic-Web.woff2 — 51.1 KiB — 381 ms — font-display: swaphttps://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/Apercu-Mono-Web.woff2Apercu-Mono-Web.woff2 https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/Apercu-Mono-Web.woff2 — 15.2 KiB — 330 ms — font-display: swap
Apercu-Regular-Web.woff2 woff2 swap
Size 27 KB
Load time 337 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
Apercu-Medium-Web.woff2 woff2 swap
Size 28 KB
Load time 319 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
LyonDisplayLF-Regular-W... woff2 swap
Size 33 KB
Load time 325 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
LyonDisplayLF-RegularIt... woff2 swap
Size 51 KB
Load time 381 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
Apercu-Mono-Web.woff2 woff2 swap
Size 15 KB
Load time 330 ms
Start 3.4 s
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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
preload
3
dns-prefetch
1
prefetch

4 resource hints configured

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
82 requests over 4943ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 6.9 s LCP 7.8 shttps://usyd.edu.au// https://usyd.edu.au/ — 301 — 227 B — 836 ms — http/1.1https://www.sydney.edu.au/www.sydney.edu.au/ https://www.sydney.edu.au/ — 200 — 9.6 KiB — 356 ms — h2https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/rum-standalone.jsrum.hlx.page/.rum/@adobe/helix-rum-... https://rum.hlx.page/.rum/@adobe/helix-rum-js@%5E2/dist/rum-standalone.js — 200 — 2.8 KiB — 69 ms — h2https://www.sydney.edu.au/content/dam/corporate/ex/images/hero-crop/2026/marine_student_home_page_do_not_reuse.jpg/jcr:content/renditions/cq5dam.web.440.210.2x.jpegwww.sydney.edu.au/content/dam/corpo... https://www.sydney.edu.au/content/dam/corporate/ex/images/hero-crop/2026/marine_student_home_page_do_not_reuse.jpg/jcr:content/renditions/cq5dam.web.440.210.2x.jpeg — 200 — 37.6 KiB — 370 ms — h2https://assets.adobedtm.com/84fa4ed6cd2d/93f43475a61e/launch-a9ab0e6066cc.min.jsassets.adobedtm.com/84fa4ed6cd2d/93... https://assets.adobedtm.com/84fa4ed6cd2d/93f43475a61e/launch-a9ab0e6066cc.min.js — 200 — 140.9 KiB — 55 ms — h2https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-js.982a02b02f679df8eafac1b6a6e4fc85.jswww.sydney.edu.au/etc.clientlibs/co... https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-js.982a02b02f679df8eafac1b6a6e4fc85.js — 200 — 218.7 KiB — 388 ms — h2https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-css.a21205c61b92636aae5dea0707061ed1.csswww.sydney.edu.au/etc.clientlibs/co... https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-css.a21205c61b92636aae5dea0707061ed1.css — 200 — 78.7 KiB — 380 ms — h2https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-search.d63e01a6c5efe46c3b134e8f8e34529f.csswww.sydney.edu.au/etc.clientlibs/co... https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-search.d63e01a6c5efe46c3b134e8f8e34529f.css — 200 — 6.3 KiB — 320 ms — h2https://www.sydney.edu.au/content/dam/icons/logos/logo-usyd-dark.svgwww.sydney.edu.au/content/dam/icons... https://www.sydney.edu.au/content/dam/icons/logos/logo-usyd-dark.svg — 200 — 9.3 KiB — 384 ms — h2https://static.cloud.coveo.com/atomic/v3.13/atomic.esm.jsstatic.cloud.coveo.com/atomic/v3.13... https://static.cloud.coveo.com/atomic/v3.13/atomic.esm.js — 200 — 8.3 KiB — 92 ms — h2https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-search.a6e2a76740ba945a80caac9d44ea5e22.jswww.sydney.edu.au/etc.clientlibs/co... https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-search.a6e2a76740ba945a80caac9d44ea5e22.js — 200 — 215.8 KiB — 384 ms — h2https://dpm.demdex.net/id?d_visid_ver=5.5.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_orgid=35B46472540D9EE20A4C98A6%40AdobeOrg&d_nsid=0&ts=1776896682388dpm.demdex.net/id?d_visid_ver=5.5.0... https://dpm.demdex.net/id?d_visid_ver=5.5.0&d_fieldgroup=MC&d_rtbd=json&d_ver=2&d_orgid=35B46472540D9EE20A4C98A6%40AdobeOrg&d_nsid=0&ts=1776896682388 — 200 — 1.5 KiB — 151 ms — h2https://sanalytics.sydney.edu.au/id?d_visid_ver=5.5.0&d_fieldgroup=A&mcorgid=35B46472540D9EE20A4C98A6%40AdobeOrg&mid=48520767298679502363028351030262920289&ts=1776896682543sanalytics.sydney.edu.au/id?d_visid... https://sanalytics.sydney.edu.au/id?d_visid_ver=5.5.0&d_fieldgroup=A&mcorgid=35B46472540D9EE20A4C98A6%40AdobeOrg&mid=48520767298679502363028351030262920289&ts=1776896682543 — 200 — 460 B — 572 ms — h2https://www.sydney.edu.au/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.027d01df25f17066242db969c9bf2ade.jswww.sydney.edu.au/etc.clientlibs/co... https://www.sydney.edu.au/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.027d01df25f17066242db969c9bf2ade.js — 200 — 2.2 KiB — 308 ms — h3https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-commons-core-js.deaf12db4cf945a0ca13edc97fde1c59.jswww.sydney.edu.au/etc.clientlibs/co... https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-commons-core-js.deaf12db4cf945a0ca13edc97fde1c59.js — 200 — 18.1 KiB — 323 ms — h3https://www.sydney.edu.au/etc.clientlibs/core/wcm/components/commons/datalayer/v1/clientlibs/core.wcm.components.commons.datalayer.v1.26e7b73e6dfd6225be931b9e9b1e405d.jswww.sydney.edu.au/etc.clientlibs/co... https://www.sydney.edu.au/etc.clientlibs/core/wcm/components/commons/datalayer/v1/clientlibs/core.wcm.components.commons.datalayer.v1.26e7b73e6dfd6225be931b9e9b1e405d.js — 200 — 13.8 KiB — 316 ms — h3https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.jsassets.adobedtm.com/extensions/EP31... https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js — 200 — 13.0 KiB — 3 ms — h2https://cm.everesttech.net/cm/dd?d_uuid=53591720124308033492526323328374992232cm.everesttech.net/cm/dd?d_uuid=535... https://cm.everesttech.net/cm/dd?d_uuid=53591720124308033492526323328374992232 — 302 — 517 B — 237 ms — http/1.1https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/Apercu-Regular-Web.woff2www.sydney.edu.au/etc.clientlibs/co... https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/foundation/resources/corporate-frontend-svelte/corporate/assets/fonts/Apercu-Regular-Web.woff2 — 200 — 27.3 KiB — 337 ms — 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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-party 3438ms · 916KB · A$59/mo
www.sydney.edu.au
Other
Costly
Execution 712ms
Transfer 219 KB
Unused 71%
Monthly Cost A$12/mo
Unattributable
Other
Costly
Execution 625ms
Transfer 0 KB
Monthly Cost A$11/mo
assets.adobedtm.com
Other
Costly
Execution 561ms
Transfer 141 KB
Unused 27%
Monthly Cost A$10/mo
www.sydney.edu.au
Other
Costly
Execution 534ms
Transfer 256 KB
Unused 95%
Monthly Cost A$9/mo
cdn.ketchjs.com
Other
Costly
Execution 465ms
Transfer 259 KB
Unused 46%
Monthly Cost A$8/mo
www.sydney.edu.au
Other
Costly
Execution 397ms
Transfer 10 KB
Monthly Cost A$7/mo
www.sydney.edu.au
Other
Optional
Execution 80ms
Transfer 18 KB
Monthly Cost A$1/mo
www.sydney.edu.au
Other
Optional
Execution 63ms
Transfer 14 KB
Monthly Cost A$1/mo

These scripts may cost more than they're worth

  • www.sydney.edu.au adds 712ms and costs ~A$12/month
  • Unattributable adds 625ms and costs ~A$11/month
  • assets.adobedtm.com adds 561ms and costs ~A$10/month
  • www.sydney.edu.au adds 534ms and costs ~A$9/month
  • cdn.ketchjs.com adds 465ms and costs ~A$8/month
  • www.sydney.edu.au adds 397ms and costs ~A$7/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.sydney.edu.au takes 712ms 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

71% of www.sydney.edu.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

Unattributable takes 625ms 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

assets.adobedtm.com takes 561ms 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.sydney.edu.au takes 534ms 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

95% of www.sydney.edu.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

cdn.ketchjs.com takes 465ms 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.sydney.edu.au takes 397ms 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

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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