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https://nla.gov.au

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

6.53 s

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

13.61 s

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

362 ms

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

0.193

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

8.64 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.

13.61 s

Page Load Progression

663 ms
1.3 s
2.0 s
2.6 s
3.3 s
4.0 s
4.6 s
5.3 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
5.2 MB transferred, 177 requests
FIX
5.2 MB transferred, 177 requests
Critical::
Page weighs 7.2 MB (5.2 MB transferred)
Warning::
Images are 3.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.9 MB
Warning::
JavaScript is 785 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 785 KB
Warning::
177 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.2 MB / 2.4 MB budget
5.2 MB transferred
177 requests
1.1 g CO2 per page load
Images 3.9 MiB 74%
JavaScript 785.0 KiB 15%
HTML 313.6 KiB 6%
Fonts 175.8 KiB 3%
CSS 85.8 KiB 2%
Other 5.1 KiB 0%
Other 1.6 KiB 0%
Other 552 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
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (5.2 MiB of 5.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2657ms total JS execution
FIX
2657ms total JS execution
Warning::
https://www.library.gov.au/: 743ms CPU time
Warning::
https://www.library.gov.au/themes/custom/nla/asset...: 547ms CPU time
Warning::
Unattributable: 502ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-3SR5...: 217ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5RD...: 165ms CPU time
Warning::
Third-party scripts: 2657ms (100% of total)

Main Thread Breakdown

Script Evaluation 34% Other 33% Style & Layout 15% Script Parsing & Compilation 7% Parse HTML & CSS 6% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.library.gov.au/743ms30ms3ms3rd
https://www.library.gov.au/themes/custom/nla/assets/js/bundle.js?tdrzxc547ms198ms18ms3rd
Unattributable502ms16ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-3SR5GMR9HT&cx=c&gtm=4e64h1217ms166ms38ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5RDVVN5N165ms122ms30ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js119ms97ms17ms3rd
https://www.library.gov.au/core/misc/drupal.init.js?v=10.6.5106ms84ms0ms3rd
https://connect.facebook.net/en_US/fbevents.js102ms76ms25ms3rd
https://connect.facebook.net/signals/config/1572021990082000?v=2.9.303&r=stable&domain=www.library.gov.au&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16888ms74ms14ms3rd
https://www.library.gov.au/core/assets/vendor/jquery/jquery.min.js?v=3.7.168ms51ms6ms3rd
D
Page Weight Inventory
Action
177 resources · 5.2 MB · 250 KB savings available
FIX
177 resources · 5.2 MB · 250 KB savings available
Warning::
Page weight 4.2 MB over 1MB target
Got: 5.2 MB Expected: ≤ 1 MB
Info::
~250 KB of savings available
Warning::
176 third-party resources (100% of weight)
Info::
8 resources over 200KB
177 resources · 5.2 MiB · 176 third-party 4.2 MiB over 1MB target
Image 75% · 3.9 MiB
JavaScript 15% · 785.0 KiB
Document 6% · 313.9 KiB
Font 3% · 175.8 KiB
CSS 2% · 85.8 KiB
Other 0% · 5.7 KiB

~249.8 KiB of savings available

Remove unused JavaScript: 249.8 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.

B
Image Optimization
65 images, 0 KB saveable
REVIEW
65 images, 0 KB saveable
Info::
All images are well-optimized
65 images 3.9 MB
0 oversized -0 KB
64 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
64 scripts, 250 KB unused
REVIEW
64 scripts, 250 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-3SR5...: 68 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5RD...: 64 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.library.gov.au/themes/custom/nla/asset...: 45 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 35 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 250 KB
250 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-3SR5GMR9HT&cx=c&gtm=4e64h1167 KB68 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5RDVVN5N132 KB64 KB (48%)✓3rd
https://www.library.gov.au/themes/custom/nla/assets/js/bundle.js?tdrzxc93 KB45 KB (49%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://connect.facebook.net/en_US/fbevents.js99 KB35 KB (36%)✓3rd
https://www.library.gov.au/core/assets/vendor/jquery.ui/ui/widgets/resizable-min.js?v=10.6.57 KB—✓3rd
https://www.library.gov.au/modules/contrib/block_ajax/js/ajax_blocks.js?tdrzxc2 KB—✓3rd
https://connect.facebook.net/signals/config/1572021990082000?v=2.9.303&r=stable&domain=www.library.gov.au&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16846 KB—✓3rd
https://cdn.gtranslate.net/widgets/latest/dwf.js7 KB—✓3rd
https://www.library.gov.au/core/assets/vendor/jquery/jquery.min.js?v=3.7.135 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

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 (176 KB)
PASS
4 fonts (176 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

176 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 6.5 s LCP 13.6 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 37 ms — font-display: swaphttps://fonts.gstatic.com/s/stixtwotext/v18/YA9Vr02F12Xkf5whdwKf11l0p76Mi93T_dE.woff2YA9Vr02F12Xkf5whdwKf11l... https://fonts.gstatic.com/s/stixtwotext/v18/YA9Vr02F12Xkf5whdwKf11l0p76Mi93T_dE.woff2 — 27.8 KiB — 27 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu0SC55K5gw.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu0SC55K5gw.woff2 — 29.9 KiB — 35 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 76.0 KiB — 115 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 37 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
YA9Vr02F12Xkf5whdwKf11l... woff2 swap
Size 28 KB
Load time 27 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 30 KB
Load time 35 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 unknown swap
Size 76 KB
Load time 115 ms
Start 3.0 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 ~23 KB and ~46 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 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
177 requests over 4180ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 6.5 s LCP 13.6 shttps://nla.gov.au// https://nla.gov.au/ — 302 — 100 B — 845 ms — h2https://www.nla.gov.au/www.nla.gov.au/ https://www.nla.gov.au/ — 301 — 215 B — 844 ms — h2https://www.library.gov.au/www.library.gov.au/ https://www.library.gov.au/ — 200 — 313.6 KiB — 1.3 s — h2https://www.library.gov.au/sites/default/files/hotjar/hotjar.script.js?tdrzxcwww.library.gov.au/sites/default/fi... https://www.library.gov.au/sites/default/files/hotjar/hotjar.script.js?tdrzxc — 200 — 514 B — 10 ms — h2https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&family=STIX+Two+Text:ital,wght@0,400..700;1,400..700&display=swapfonts.googleapis.com/css2?family=Op... https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&family=STIX+Two+Text:ital,wght@0,400..700;1,400..700&display=swap — 200 — 2.5 KiB — 150 ms — h2https://www.library.gov.au/modules/contrib/block_ajax/css/ajax_blocks.css?tdrzxcwww.library.gov.au/modules/contrib/... https://www.library.gov.au/modules/contrib/block_ajax/css/ajax_blocks.css?tdrzxc — 200 — 509 B — 25 ms — h2https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/core.css?tdrzxcwww.library.gov.au/core/assets/vend... https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/core.css?tdrzxc — 200 — 892 B — 20 ms — h2https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/controlgroup.css?tdrzxcwww.library.gov.au/core/assets/vend... https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/controlgroup.css?tdrzxc — 200 — 716 B — 30 ms — h2https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/autocomplete.css?tdrzxcwww.library.gov.au/core/assets/vend... https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/autocomplete.css?tdrzxc — 200 — 403 B — 20 ms — h2https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/menu.css?tdrzxcwww.library.gov.au/core/assets/vend... https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/menu.css?tdrzxc — 200 — 647 B — 49 ms — h2https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/checkboxradio.css?tdrzxcwww.library.gov.au/core/assets/vend... https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/checkboxradio.css?tdrzxc — 200 — 664 B — 20 ms — h2https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/resizable.css?tdrzxcwww.library.gov.au/core/assets/vend... https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/resizable.css?tdrzxc — 200 — 598 B — 21 ms — h2https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/button.css?tdrzxcwww.library.gov.au/core/assets/vend... https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/button.css?tdrzxc — 200 — 823 B — 20 ms — h2https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/dialog.css?tdrzxcwww.library.gov.au/core/assets/vend... https://www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/dialog.css?tdrzxc — 200 — 813 B — 20 ms — h2https://www.library.gov.au/core/themes/stable9/css/core/components/progress.module.css?tdrzxcwww.library.gov.au/core/themes/stab... https://www.library.gov.au/core/themes/stable9/css/core/components/progress.module.css?tdrzxc — 200 — 548 B — 21 ms — h2https://www.library.gov.au/core/themes/stable9/css/core/components/ajax-progress.module.css?tdrzxcwww.library.gov.au/core/themes/stab... https://www.library.gov.au/core/themes/stable9/css/core/components/ajax-progress.module.css?tdrzxc — 200 — 648 B — 34 ms — h2https://www.library.gov.au/core/themes/stable9/css/core/components/autocomplete-loading.module.css?tdrzxcwww.library.gov.au/core/themes/stab... 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https://www.facebook.com/tr/?id=1572021990082000&ev=PageView&dl=https%3A%2F%2Fwww.library.gov.au%2F&rl=&if=false&ts=1776808342605&sw=412&sh=823&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.2.1776808342598.687271995177183118&ler=empty&cdl=API_unavailable&pmd[title]=Home%20%7C%20National%20Library%20of%20Australia%20(NLA)&pmd[locale]=en&plt=3418.6000003814697&it=1776808341871&coo=false&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im0&expv2[6]=hf0&rqm=GET — 200 — 16 B — 70 ms — h3https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=1572021990082000&ev=PageView&dl=https%3A%2F%2Fwww.library.gov.au%2F&rl=&if=false&ts=1776808342605&sw=412&sh=823&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.2.1776808342598.687271995177183118&ler=empty&cdl=API_unavailable&pmd[title]=Home%20%7C%20National%20Library%20of%20Australia%20(NLA)&pmd[locale]=en&plt=3418.6000003814697&it=1776808341871&coo=false&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im0&expv2[6]=hf0&rqm=FGETwww.facebook.com/privacy_sandbox/pi... https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=1572021990082000&ev=PageView&dl=https%3A%2F%2Fwww.library.gov.au%2F&rl=&if=false&ts=1776808342605&sw=412&sh=823&v=2.9.303&r=stable&ec=0&o=4126&fbp=fb.2.1776808342598.687271995177183118&ler=empty&cdl=API_unavailable&pmd[title]=Home%20%7C%20National%20Library%20of%20Australia%20(NLA)&pmd[locale]=en&plt=3418.6000003814697&it=1776808341871&coo=false&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&expv2[0]=pl1&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=im0&expv2[6]=hf0&rqm=FGET — 200 — 198 B — 215 ms — h3https://www.library.gov.au/themes/custom/nla/favicon.icowww.library.gov.au/themes/custom/nl... https://www.library.gov.au/themes/custom/nla/favicon.ico — 200 — 1.3 KiB — 3 ms — h2
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 2657ms · 943KB · A$46/mo
www.library.gov.au
Other
Costly
Execution 743ms
Transfer 314 KB
Monthly Cost A$13/mo
www.library.gov.au
Other
Costly
Execution 547ms
Transfer 93 KB
Unused 49%
Monthly Cost A$9/mo
Unattributable
Other
Costly
Execution 502ms
Transfer 0 KB
Monthly Cost A$9/mo
Google Tag Manager
Tag Manager
Costly
Execution 217ms
Transfer 167 KB
Unused 41%
Monthly Cost A$4/mo
Google Tag Manager
Tag Manager
Optional
Execution 165ms
Transfer 132 KB
Unused 48%
Monthly Cost A$3/mo
Hotjar
Session Replay
Optional
Execution 119ms
Transfer 57 KB
Unused 67%
Monthly Cost A$2/mo
www.library.gov.au
Other
Optional
Execution 106ms
Transfer 1 KB
Monthly Cost A$2/mo
Facebook Pixel
Advertising
Optional
Execution 102ms
Transfer 99 KB
Unused 36%
Monthly Cost A$2/mo
Facebook Pixel
Advertising
Optional
Execution 88ms
Transfer 46 KB
Monthly Cost A$2/mo
www.library.gov.au
Other
Optional
Execution 68ms
Transfer 35 KB
Monthly Cost A$1/mo

These scripts may cost more than they're worth

  • www.library.gov.au adds 743ms and costs ~A$13/month
  • www.library.gov.au adds 547ms and costs ~A$9/month
  • Unattributable adds 502ms and costs ~A$9/month
  • Google Tag Manager adds 217ms 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

www.library.gov.au takes 743ms 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.library.gov.au takes 547ms 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 502ms 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 217ms 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

67% of Hotjar'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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