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https://unsw.edu.au

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
68
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.

1.57 s

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

3.97 s

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

35 ms

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

0.000

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

2.71 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.

3.97 s

Page Load Progression

412 ms
823 ms
1.2 s
1.6 s
2.1 s
2.5 s
2.9 s
3.3 s
Checks
15
5 PASS 4 REVIEW 4 FIX
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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
26 scripts, 349 KB unused
FIX
26 scripts, 349 KB unused
Warning::
https://www.unsw.edu.au/etc.clientlibs/unsw-common...: 141 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-au.onetrust.com/scripttemplates/202506...: 62 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/5193c887f471/83c1721e0...: 50 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.unsw.edu.au/etc.clientlibs/unsw-common...: 42 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.unsw.edu.au/etc.clientlibs/unsw-common...: 30 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 349 KB
349 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-ui-frontend.min.8.6.1.2026_0401_151931_0007853651.js206 KB141 KB (71%)✓3rd
https://cdn-au.onetrust.com/scripttemplates/202506.1.0/otBannerSdk.js120 KB62 KB (52%)✓3rd
https://assets.adobedtm.com/5193c887f471/83c1721e06f3/launch-5f04fe5ed56c.min.js150 KB50 KB (33%)✓3rd
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-common-base.min.8.6.1.2026_0401_151931_0007853651.js75 KB42 KB (64%)✓3rd
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/sanitize-html.min.8.6.1.2026_0401_151931_0007853651.js72 KB30 KB (48%)✓3rd
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-dynamic-modules/resources/490-c8f2e23edbef1eb33b62.js41 KB24 KB (73%)✓3rd
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-dynamic-modules/resources/2346-2c3576df74a7d97194d3.js15 KB—✓3rd
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-dynamic-modules/resources/degree-search-v2-eb1908ad99ee751a9ca5.js8 KB—✓3rd
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-common-components.min.8.6.1.2026_0401_151931_0007853651.js13 KB—✓3rd
https://cdn-au.onetrust.com/consent/01938945-6d92-7430-b805-8b23a6fde820/otSDKStub.js11 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
69 resources · 1.9 MB · 349 KB savings available
FIX
69 resources · 1.9 MB · 349 KB savings available
Warning::
Page weight 904 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~349 KB of savings available
Warning::
68 third-party resources (100% of weight)
Info::
1 resources over 200KB
69 resources · 1.9 MiB · 68 third-party 903.8 KiB over 1MB target
JavaScript 44% · 850.7 KiB
Font 27% · 513.7 KiB
CSS 16% · 312.2 KiB
Image 9% · 173.5 KiB
Other 2% · 43.1 KiB
Document 2% · 34.5 KiB

~349.3 KiB of savings available

Remove unused JavaScript: 349.3 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
Page Weight Budget
Action
1.9 MB transferred, 69 requests
REVIEW
1.9 MB transferred, 69 requests
Info::
Page weighs 5.9 MB (1.9 MB transferred)
Warning::
JavaScript is 825 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 825 KB
Info::
Fonts are 514 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 514 KB
Info::
CSS is 308 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 308 KB
Info::
69 HTTP requests
Info::
Estimated 0.39 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
69 requests
0.39 g CO2 per page load
JavaScript 825.2 KiB 43%
Fonts 513.7 KiB 27%
CSS 307.8 KiB 16%
Images 142.2 KiB 7%
Other 62.2 KiB 3%
HTML 33.9 KiB 2%
Other 31.3 KiB 2%
Other 11.5 KiB 1%
0 2.4 MB 4.9 MB
Approaching limit

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

C
Image Optimization
Action
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
https://www.unsw.edu.au/content/dam/images/graphic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unsw.edu.au/content/dam/images/graphic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.unsw.edu.au/content/dam/images/graphic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5... 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.
Warning::
https://www.unsw.edu.au/content/dam/images/graphic... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12 images 142 KB
0 oversized -0 KB
11 legacy format
6 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

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.

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
1010ms total JS execution
REVIEW
1010ms total JS execution
Warning::
https://www.unsw.edu.au/: 340ms CPU time
Warning::
https://www.unsw.edu.au/etc.clientlibs/unsw-common...: 289ms CPU time
Info::
Unattributable: 133ms CPU time
Info::
https://assets.adobedtm.com/5193c887f471/83c1721e0...: 116ms CPU time
Info::
https://cdn-au.onetrust.com/scripttemplates/202506...: 73ms CPU time
Warning::
Third-party scripts: 1010ms (100% of total)

Main Thread Breakdown

Script Evaluation 33% Other 28% Style & Layout 25% Script Parsing & Compilation 5% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.unsw.edu.au/340ms5ms0ms3rd
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/jquery.min.8.6.1.2026_0401_151931_0007853651.js289ms127ms3ms3rd
Unattributable133ms20ms0ms3rd
https://assets.adobedtm.com/5193c887f471/83c1721e06f3/launch-5f04fe5ed56c.min.js116ms77ms17ms3rd
https://cdn-au.onetrust.com/scripttemplates/202506.1.0/otBannerSdk.js73ms41ms11ms3rd
https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-ui-frontend.min.8.6.1.2026_0401_151931_0007853651.js58ms40ms14ms3rd
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
10 fonts (514 KB)
PASS
10 fonts (514 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

514 KB total

Render-blocking

0

of 10

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 FCP 1.6 s LCP 4.0 shttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/fontawesome/resources/fa-brands-400.woff2fa-brands-400.woff2 https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/fontawesome/resources/fa-brands-400.woff2 — 122.9 KiB — 131 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/fontawesome/resources/fa-solid-900.woff2fa-solid-900.woff2 https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/fontawesome/resources/fa-solid-900.woff2 — 161.2 KiB — 87 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-regular-webfont.woff2clancy-regular-webfont.... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-regular-webfont.woff2 — 27.2 KiB — 69 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-regular-webfont.woffclancy-regular-webfont.... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-regular-webfont.woff — 33.4 KiB — 73 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-bold-webfont.woff2clancy-bold-webfont.woff2 https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-bold-webfont.woff2 — 26.9 KiB — 93 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-light-webfont.woff2clancy-light-webfont.woff2 https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-light-webfont.woff2 — 26.2 KiB — 90 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-regular-webfont.woff2roboto-regular-webfont.... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-regular-webfont.woff2 — 27.1 KiB — 100 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-regular-webfont.woffroboto-regular-webfont.... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-regular-webfont.woff — 33.7 KiB — 96 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-bold-webfont.woff2roboto-bold-webfont.woff2 https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-bold-webfont.woff2 — 27.4 KiB — 102 ms — font-display: swaphttps://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/robotomono/robotomono-regular-webfont.woff2robotomono-regular-webf... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/robotomono/robotomono-regular-webfont.woff2 — 27.8 KiB — 114 ms — font-display: swap
fa-brands-400.woff2 woff2 swap
Size 123 KB
Load time 131 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-solid-900.woff2 woff2 swap
Size 161 KB
Load time 87 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
clancy-regular-webfont.... woff2 swap
Size 27 KB
Load time 69 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
clancy-regular-webfont.... woff swap
Size 33 KB
Load time 73 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
clancy-bold-webfont.woff2 woff2 swap
Size 27 KB
Load time 93 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
clancy-light-webfont.woff2 woff2 swap
Size 26 KB
Load time 90 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
roboto-regular-webfont.... woff2 swap
Size 27 KB
Load time 100 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
roboto-regular-webfont.... woff swap
Size 34 KB
Load time 96 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
roboto-bold-webfont.woff2 woff2 swap
Size 27 KB
Load time 102 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
robotomono-regular-webf... woff2 swap
Size 28 KB
Load time 114 ms
Start 1.0 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)

Fixing the unchecked items could save ~162 KB and ~324 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
Network Waterfall
69 requests over 2318ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.6 s LCP 4.0 shttps://unsw.edu.au// https://unsw.edu.au/ — 301 — 617 B — 936 ms — h2https://www.unsw.edu.au/www.unsw.edu.au/ https://www.unsw.edu.au/ — 200 — 33.9 KiB — 65 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 — 34 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/fontawesome/resources/fa-brands-400.woff2www.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/fontawesome/resources/fa-brands-400.woff2 — 200 — 122.9 KiB — 131 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/fontawesome/resources/fa-solid-900.woff2www.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/clientlib-vendor/fontawesome/resources/fa-solid-900.woff2 — 200 — 161.2 KiB — 87 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-regular-webfont.woff2www.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-regular-webfont.woff2 — 200 — 27.2 KiB — 69 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-regular-webfont.woffwww.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-regular-webfont.woff — 200 — 33.4 KiB — 73 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-bold-webfont.woff2www.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-bold-webfont.woff2 — 200 — 26.9 KiB — 93 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-light-webfont.woff2www.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/clancy/clancy-light-webfont.woff2 — 200 — 26.2 KiB — 90 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-regular-webfont.woff2www.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-regular-webfont.woff2 — 200 — 27.1 KiB — 100 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-regular-webfont.woffwww.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-regular-webfont.woff — 200 — 33.7 KiB — 96 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-bold-webfont.woff2www.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/roboto/roboto-bold-webfont.woff2 — 200 — 27.4 KiB — 102 ms — h2https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/robotomono/robotomono-regular-webfont.woff2www.unsw.edu.au/etc.clientlibs/unsw... https://www.unsw.edu.au/etc.clientlibs/unsw-common/clientlibs/unsw-fonts/src/assets/resources/fonts/robotomono/robotomono-regular-webfont.woff2 — 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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 1010ms · 548KB · A$17/mo
www.unsw.edu.au
Other
Costly
Execution 340ms
Transfer 34 KB
Monthly Cost A$6/mo
www.unsw.edu.au
Other
Costly
Execution 289ms
Transfer 38 KB
Monthly Cost A$5/mo
Unattributable
Other
Optional
Execution 133ms
Transfer 0 KB
Monthly Cost A$2/mo
assets.adobedtm.com
Other
Optional
Execution 116ms
Transfer 150 KB
Unused 33%
Monthly Cost A$2/mo
cdn-au.onetrust.com
Other
Optional
Execution 73ms
Transfer 120 KB
Unused 52%
Monthly Cost A$1/mo
www.unsw.edu.au
Other
Optional
Execution 58ms
Transfer 206 KB
Unused 71%
Monthly Cost A$1/mo

These scripts may cost more than they're worth

  • www.unsw.edu.au adds 340ms and costs ~A$6/month
  • www.unsw.edu.au adds 289ms and costs ~A$5/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.unsw.edu.au takes 340ms 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.unsw.edu.au takes 289ms 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

52% of cdn-au.onetrust.com'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

71% of www.unsw.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

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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