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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

Mobile Desktop
15
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

4.21 s

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

9.19 s

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

1.12 s

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

1.702

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

5.37 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.

15.24 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
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 109 requests
FIX
3.6 MB transferred, 109 requests
Warning::
Page weighs 7.5 MB (3.6 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
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
Warning::
109 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.76 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
109 requests
0.76 g CO2 per page load
Images 2.4 MiB 65%
JavaScript 1.2 MiB 33%
Fonts 65.0 KiB 2%
HTML 11.6 KiB 0%
Other 2.3 KiB 0%
CSS 2.0 KiB 0%
Other 1.6 KiB 0%
Other 1.2 KiB 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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4303ms total JS execution
FIX
4303ms total JS execution
Warning::
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-...: 989ms CPU time
Warning::
https://www.unimelb.edu.au/: 471ms CPU time
Warning::
Unattributable: 372ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-J6RR...: 370ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-L55G...: 312ms CPU time
Warning::
Third-party scripts: 4303ms (100% of total)

Main Thread Breakdown

Script Evaluation 61% Other 17% Style & Layout 11% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/lit-element-lPWtoMCL.js989ms735ms0ms3rd
https://www.unimelb.edu.au/471ms3ms1ms3rd
Unattributable372ms41ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-J6RRCK6F9V370ms306ms39ms3rd
https://www.googletagmanager.com/gtag/js?id=G-L55G410M0Q&cx=c&gtm=4e64h1312ms237ms36ms3rd
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/lazy.js301ms296ms0ms3rd
https://cdn.optimizely.com/js/17791710119.js298ms250ms30ms3rd
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/mega-menu.js285ms113ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-YE8SEG9T0S&cx=c&gtm=4e64h1246ms190ms55ms3rd
https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.js225ms191ms30ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
83 scripts, 309 KB unused
FIX
83 scripts, 309 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-L55G...: 70 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-YE8S...: 68 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-J6RR...: 67 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.optimizely.com/js/17791710119.js: 51 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-...: 30 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-...: unminified — 12 KB could be saved
Info::
Total unused JavaScript: 309 KB
309 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-L55G410M0Q&cx=c&gtm=4e64h1173 KB70 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-YE8SEG9T0S&cx=c&gtm=4e64h1154 KB68 KB (44%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-J6RRCK6F9V174 KB67 KB (39%)✓3rd
https://cdn.optimizely.com/js/17791710119.js117 KB51 KB (44%)✓3rd
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/carousel.js65 KB30 KB (47%)✗3rd
https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.js72 KB23 KB (33%)✓3rd
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/index.js1 KB—✓3rd
https://cdn3.optimizely.com/js/geo4.js0 KB—✓3rd
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/lazy.js2 KB—✓3rd
https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/environment-DRC-CIoU.js1 KB—✓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

D
Page Weight Inventory
Action
109 resources · 3.6 MB · 309 KB savings available
FIX
109 resources · 3.6 MB · 309 KB savings available
Warning::
Page weight 2.6 MB over 1MB target
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~309 KB of savings available
Warning::
108 third-party resources (100% of weight)
Info::
3 resources over 200KB
109 resources · 3.6 MiB · 108 third-party 2.6 MiB over 1MB target
Image 65% · 2.4 MiB
JavaScript 33% · 1.2 MiB
Font 2% · 65.0 KiB
Document 0% · 12.3 KiB
Other 0% · 2.0 KiB
CSS 0% · 2.0 KiB

~309.1 KiB of savings available

Remove unused JavaScript: 309.1 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
post-check0
pre-check0
B
Image Optimization
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Info::
All images are well-optimized
12 images 2.4 MB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
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
2 fonts (65 KB)
PASS
2 fonts (65 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

65 KB total

Render-blocking

0

of 2

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 9.0 s FCP 4.2 s LCP 9.2 shttps://fonts.gstatic.com/s/sourcesans3/v19/nwpStKy2OAdR1K-IwhWudF-R3w8aZejf5Hc.woff2nwpStKy2OAdR1K-IwhWudF-... https://fonts.gstatic.com/s/sourcesans3/v19/nwpStKy2OAdR1K-IwhWudF-R3w8aZejf5Hc.woff2 — 28.1 KiB — 41 ms — font-display: swaphttps://fonts.gstatic.com/s/fraunces/v38/6NUu8FyLNQOQZAnv9bYEvDiIdE9Ea92uMiIk_WBq8U_9v0c2Wa0K7iN7hzFUPJH58nhr1Ic7qv8oRcTn.woff26NUu8FyLNQOQZAnv9bYEvDi... https://fonts.gstatic.com/s/fraunces/v38/6NUu8FyLNQOQZAnv9bYEvDiIdE9Ea92uMiIk_WBq8U_9v0c2Wa0K7iN7hzFUPJH58nhr1Ic7qv8oRcTn.woff2 — 36.9 KiB — 51 ms — font-display: swap
nwpStKy2OAdR1K-IwhWudF-... woff2 swap
Size 28 KB
Load time 41 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
6NUu8FyLNQOQZAnv9bYEvDi... woff2 swap
Size 37 KB
Load time 51 ms
Start 1.8 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
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
109 requests over 2916ms
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 9.0 s FCP 4.2 s LCP 9.2 shttps://unimelb.edu.au// https://unimelb.edu.au/ — 301 — 658 B — 344 ms — h2https://www.unimelb.edu.au/www.unimelb.edu.au/ https://www.unimelb.edu.au/ — 200 — 10.2 KiB — 324 ms — h2https://www.unimelb.edu.au/__data/assets/image/0005/5446265/241107_UoM_Science_Parkville-7998.jpg?v=0.1.0www.unimelb.edu.au/__data/assets/im... https://www.unimelb.edu.au/__data/assets/image/0005/5446265/241107_UoM_Science_Parkville-7998.jpg?v=0.1.0 — 200 — 72.8 KiB — 125 ms — h2https://cdn.optimizely.com/js/17791710119.jscdn.optimizely.com/js/17791710119.j... https://cdn.optimizely.com/js/17791710119.js — 200 — 117.5 KiB — 131 ms — h2https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.jstags.tiqcdn.com/utag/unimelb/main/p... https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.js — 200 — 71.6 KiB — 191 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/index.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/index.js — 200 — 1.1 KiB — 147 ms — h2https://cdn3.optimizely.com/js/geo4.jscdn3.optimizely.com/js/geo4.js https://cdn3.optimizely.com/js/geo4.js — 200 — 321 B — 110 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/lazy.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/lazy.js — 200 — 2.3 KiB — 34 ms — h2https://a17791710119.cdn.optimizely.com/client_storage/a17791710119.htmla17791710119.cdn.optimizely.com/cli... https://a17791710119.cdn.optimizely.com/client_storage/a17791710119.html — 200 — 1.4 KiB — 152 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/environment-DRC-CIoU.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/environment-DRC-CIoU.js — 200 — 850 B — 33 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/safe-load-component.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/safe-load-component.js — 200 — 1.5 KiB — 34 ms — h2https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.173.js?utv=ut4.53.202604210529tags.tiqcdn.com/utag/unimelb/main/p... https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.173.js?utv=ut4.53.202604210529 — 200 — 4.7 KiB — 47 ms — h2https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.161.js?utv=ut4.53.202604210529tags.tiqcdn.com/utag/unimelb/main/p... https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.161.js?utv=ut4.53.202604210529 — 200 — 4.7 KiB — 44 ms — h2https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.162.js?utv=ut4.53.202604210529tags.tiqcdn.com/utag/unimelb/main/p... https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.162.js?utv=ut4.53.202604210529 — 200 — 6.1 KiB — 46 ms — h2https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.165.js?utv=ut4.53.202604210529tags.tiqcdn.com/utag/unimelb/main/p... https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.165.js?utv=ut4.53.202604210529 — 200 — 9.4 KiB — 49 ms — h2https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.196.js?utv=ut4.53.202603180101tags.tiqcdn.com/utag/unimelb/main/p... https://tags.tiqcdn.com/utag/unimelb/main/prod/utag.196.js?utv=ut4.53.202603180101 — 200 — 6.6 KiB — 40 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/mega-menu.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/mega-menu.js — 200 — 50.8 KiB — 70 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/icon.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/icon.js — 200 — 8.2 KiB — 72 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/content-block-with-heading.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/content-block-with-heading.js — 200 — 12.0 KiB — 81 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/homepage-hero-banner.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/homepage-hero-banner.js — 200 — 9.8 KiB — 80 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/footer.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/footer.js — 200 — 33.5 KiB — 103 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/button.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/button.js — 200 — 978 B — 86 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/card-carousel-with-heading.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/card-carousel-with-heading.js — 200 — 9.0 KiB — 88 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/card-event-list.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/card-event-list.js — 200 — 9.3 KiB — 90 ms — h2https://d1d8itrvdqyp9w.cloudfront.net/ui-core-web-components/v1.0.1/modular/client/card-icon-list.jsd1d8itrvdqyp9w.cloudfront.net/ui-co... 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https://region1.google-analytics.com/g/collect?v=2&tid=G-YE8SEG9T0S&gtm=45je64h1v896304950za200zb896304416zd896304416&_p=1776804007513&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dYmQxMT&are=1&cid=1150329421.1776804008&frm=0&pscdl=noapi&rcb=6&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401&sid=1776804008&sct=1&seg=0&dl=https%3A%2F%2Fwww.unimelb.edu.au%2F&dt=The%20University%20of%20Melbourne%20-%20Australia%27s%20%231%20Ranked%20University&_tu=QA&en=page_view&_fv=1&_ss=1&_ee=1&ep.platform_u=matrix-controlled-environment&tfd=1958 — 204 — 48 B — 104 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-L55G410M0Q&gtm=45je64h1v9183503070za200zb896304416zd896304416&_p=1776804007513&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dYmQxMT&are=1&cid=1150329421.1776804008&frm=0&pscdl=noapi&rcb=6&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401&sid=1776804008&sct=1&seg=0&dl=https%3A%2F%2Fwww.unimelb.edu.au%2F&dt=The%20University%20of%20Melbourne%20-%20Australia%27s%20%231%20Ranked%20University&en=page_view&_fv=1&_ss=1&_ee=1&ep.platform_u=matrix-controlled-environment&tfd=2047region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-L55G410M0Q&gtm=45je64h1v9183503070za200zb896304416zd896304416&_p=1776804007513&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dYmQxMT&are=1&cid=1150329421.1776804008&frm=0&pscdl=noapi&rcb=6&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401&sid=1776804008&sct=1&seg=0&dl=https%3A%2F%2Fwww.unimelb.edu.au%2F&dt=The%20University%20of%20Melbourne%20-%20Australia%27s%20%231%20Ranked%20University&en=page_view&_fv=1&_ss=1&_ee=1&ep.platform_u=matrix-controlled-environment&tfd=2047 — 204 — 20 B — 24 ms — h3https://www.unimelb.edu.au/__data/assets/image/0012/4587591/favicon.pngwww.unimelb.edu.au/__data/assets/im... https://www.unimelb.edu.au/__data/assets/image/0012/4587591/favicon.png — 200 — 1.7 KiB — 75 ms — h3https://logx.optimizely.com/v1/eventslogx.optimizely.com/v1/events https://logx.optimizely.com/v1/events — 204 — 74 B — 31 ms — h2https://visitor-service-ap-southeast-2.tealiumiq.com/unimelb/main/019db1c58e660010e750ecb37d5505081001b079004eb?callback=utag.ut%5B%22writevamain%22%5D&rnd=1776804010890visitor-service-ap-southeast-2.teal... https://visitor-service-ap-southeast-2.tealiumiq.com/unimelb/main/019db1c58e660010e750ecb37d5505081001b079004eb?callback=utag.ut%5B%22writevamain%22%5D&rnd=1776804010890 — -1 — 0 B — 0 ms —
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 4303ms · 875KB · A$74/mo
d1d8itrvdqyp9w.cloudfront.net
Other
Costly
Execution 989ms
Transfer 7 KB
Monthly Cost A$17/mo
www.unimelb.edu.au
Other
Costly
Execution 471ms
Transfer 10 KB
Monthly Cost A$8/mo
Unattributable
Other
Costly
Execution 372ms
Transfer 0 KB
Monthly Cost A$6/mo
Google Tag Manager
Tag Manager
Costly
Execution 370ms
Transfer 174 KB
Unused 39%
Monthly Cost A$6/mo
Google Tag Manager
Tag Manager
Costly
Execution 312ms
Transfer 173 KB
Unused 41%
Monthly Cost A$5/mo
d1d8itrvdqyp9w.cloudfront.net
Other
Costly
Execution 301ms
Transfer 2 KB
Monthly Cost A$5/mo
Optimizely
A/B Testing
Costly
Execution 298ms
Transfer 117 KB
Unused 44%
Monthly Cost A$5/mo
d1d8itrvdqyp9w.cloudfront.net
Other
Costly
Execution 285ms
Transfer 51 KB
Monthly Cost A$5/mo
Google Tag Manager
Tag Manager
Costly
Execution 246ms
Transfer 154 KB
Unused 44%
Monthly Cost A$4/mo
tags.tiqcdn.com
Other
Costly
Execution 225ms
Transfer 72 KB
Unused 33%
Monthly Cost A$4/mo
cdn1.adoberesources.net
Other
Costly
Execution 211ms
Transfer 40 KB
Monthly Cost A$4/mo
d1d8itrvdqyp9w.cloudfront.net
Other
Optional
Execution 132ms
Transfer 65 KB
Unused 47%
Monthly Cost A$2/mo
tags.tiqcdn.com
Other
Optional
Execution 90ms
Transfer 9 KB
Monthly Cost A$2/mo

These scripts may cost more than they're worth

  • d1d8itrvdqyp9w.cloudfront.net adds 989ms and costs ~A$17/month
  • www.unimelb.edu.au adds 471ms and costs ~A$8/month
  • Unattributable adds 372ms and costs ~A$6/month
  • Google Tag Manager adds 370ms and costs ~A$6/month
  • Google Tag Manager adds 312ms and costs ~A$5/month
  • d1d8itrvdqyp9w.cloudfront.net adds 301ms and costs ~A$5/month
  • Optimizely adds 298ms and costs ~A$5/month
  • d1d8itrvdqyp9w.cloudfront.net adds 285ms and costs ~A$5/month
  • Google Tag Manager adds 246ms and costs ~A$4/month
  • tags.tiqcdn.com adds 225ms and costs ~A$4/month
  • cdn1.adoberesources.net adds 211ms and costs ~A$4/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

d1d8itrvdqyp9w.cloudfront.net takes 989ms 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.unimelb.edu.au takes 471ms 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 372ms 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 370ms 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 312ms 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

d1d8itrvdqyp9w.cloudfront.net takes 301ms 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

Optimizely takes 298ms 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

d1d8itrvdqyp9w.cloudfront.net takes 285ms 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 246ms 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

tags.tiqcdn.com takes 225ms 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

cdn1.adoberesources.net 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

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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