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Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

62

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
/sites/default/files/styles/news_media_listing/public/ima...1209600.0 s820.0 KiB
/sites/default/files/styles/news_media_listing/public/ima...1209600.0 s568.3 KiB
/sites/default/files/styles/news_media_listing/public/ima...1209600.0 s543.6 KiB
/sites/default/files/styles/news_media_listing/public/ima...1209600.0 s500.3 KiB
/signals/config/1572021990082000?v=2.9.303&r=stable&domai...1200.0 s44.5 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...1209600.0 s383.0 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...1209600.0 s225.6 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...1209600.0 s215.8 KiB
www.library.gov.au/themes/custom/nla/assets/js/bundle.js?tdrzxc1209600.0 s93.4 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s83.3 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s68.3 KiB
static.hotjar.com/c/hotjar-5130746.js?sv=660.0 s6.2 KiB
/sites/default/files/styles/news_media_listing/public/ima...1209600.0 s62.8 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s60.8 KiB
www.library.gov.au/themes/custom/nla/assets/css/bundle.css?tdrzxc1209600.0 s57.5 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s55.0 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s52.8 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s40.3 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s38.4 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s37.0 KiB
/sites/default/files/styles/discover_carousel/public/imag...1209600.0 s35.5 KiB
www.library.gov.au/core/assets/vendor/jquery/jquery.min.js?v=3.7.11209600.0 s34.8 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...1209600.0 s34.2 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...1209600.0 s27.7 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...1209600.0 s26.6 KiB
www.library.gov.au/core/misc/ajax.js?v=10.6.51209600.0 s20.4 KiB
www.library.gov.au/core/misc/jquery.form.js?v=4.3.01209600.0 s15.6 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...1209600.0 s14.3 KiB
www.library.gov.au/themes/custom/nla/logo-dark.svg1209600.0 s14.2 KiB
www.library.gov.au/themes/custom/nla/logo.svg1209600.0 s14.0 KiB
www.library.gov.au/themes/custom/nla/nla-footer-logo.svg1209600.0 s13.0 KiB
www.library.gov.au/themes/custom/nla/assets/images/AWA_Winner_2025.svg1209600.0 s8.0 KiB
www.library.gov.au/core/misc/drupal.js?v=10.6.51209600.0 s7.4 KiB
/core/assets/vendor/jquery.ui/ui/widgets/resizable-min.js...1209600.0 s6.9 KiB
www.library.gov.au/core/misc/position.js?v=10.6.51209600.0 s6.8 KiB
/core/assets/vendor/jquery.ui/ui/widgets/draggable-min.js...1209600.0 s5.7 KiB
/sites/default/files/images/2026-02/quiet hours - dark_0.png1209600.0 s5.0 KiB
www.library.gov.au/themes/custom/nla/assets/images/AWA_Winner_2025_dark.svg1209600.0 s4.9 KiB
/sites/default/files/images/2026-02/quiet hours - light_0...1209600.0 s4.7 KiB
/core/assets/vendor/jquery.ui/ui/widgets/dialog-min.js?v=...1209600.0 s4.5 KiB
www.library.gov.au/core/misc/dialog/dialog.ajax.js?v=10.6.51209600.0 s3.7 KiB
www.library.gov.au/core/assets/vendor/jquery.ui/ui/widget-min.js?v=10.6.51209600.0 s3.7 KiB
www.library.gov.au/core/assets/vendor/jquery.ui/ui/widgets/menu-min.js?v=10.6.51209600.0 s3.6 KiB
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/theme.css?tdrzxc1209600.0 s3.6 KiB
/core/assets/vendor/jquery.ui/ui/widgets/autocomplete-min...1209600.0 s3.3 KiB
www.library.gov.au/core/misc/displace.js?v=10.6.51209600.0 s3.1 KiB
www.library.gov.au/core/misc/message.js?v=10.6.51209600.0 s2.9 KiB
www.library.gov.au/core/misc/autocomplete.js?v=10.6.51209600.0 s2.8 KiB
www.library.gov.au/core/assets/vendor/tabbable/index.umd.min.js?v=6.3.01209600.0 s2.8 KiB
/core/assets/vendor/jquery.ui/ui/widgets/button-min.js?v=...1209600.0 s2.4 KiB
www.library.gov.au/core/misc/progress.js?v=10.6.51209600.0 s2.2 KiB
/core/assets/vendor/tua-body-scroll-lock/tua-bsl.umd.min....1209600.0 s2.1 KiB
www.library.gov.au/core/misc/announce.js?v=10.6.51209600.0 s2.1 KiB
www.library.gov.au/modules/contrib/block_ajax/js/ajax_blocks.js?tdrzxc1209600.0 s2.1 KiB
/core/assets/vendor/jquery.ui/ui/widgets/controlgroup-min...1209600.0 s1.9 KiB
www.library.gov.au/core/misc/dialog/dialog.position.js?v=10.6.51209600.0 s1.8 KiB
/core/assets/vendor/jquery.ui/ui/widgets/checkboxradio-mi...1209600.0 s1.8 KiB
/sites/default/files/images/2024-08/Guide dog - darkx3.png1209600.0 s1.7 KiB
/sites/default/files/images/2024-08/Assisstive listening ...1209600.0 s1.6 KiB
/modules/contrib/search_api_autocomplete/js/search_api_au...1209600.0 s1.6 KiB
www.library.gov.au/core/misc/dialog/dialog.js?v=10.6.51209600.0 s1.6 KiB
/sites/default/files/images/2024-08/Wheelchair accessible...1209600.0 s1.5 KiB
/sites/default/files/images/2024-08/Assisstive listening ...1209600.0 s1.5 KiB
/sites/default/files/images/2024-08/Guide dog - lightx3.png1209600.0 s1.5 KiB
www.library.gov.au/core/misc/throbber-active.gif1209600.0 s1.5 KiB
/sites/default/files/images/2024-08/Wheelchair accessible...1209600.0 s1.5 KiB
www.library.gov.au/themes/custom/nla/assets/00674d6da9f201ac3bea.svg1209600.0 s1.5 KiB
/modules/contrib/clientside_validation/clientside_validat...1209600.0 s1.5 KiB
www.library.gov.au/themes/custom/nla/assets/251a504e9bde15add0e9.svg1209600.0 s1.4 KiB
www.library.gov.au/core/assets/vendor/jquery.ui/ui/widgets/mouse-min.js?v=10.6.51209600.0 s1.3 KiB
www.library.gov.au/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.01209600.0 s1.3 KiB
/modules/contrib/better_exposed_filters/js/better_exposed...1209600.0 s1.2 KiB
www.library.gov.au/core/misc/dialog/dialog.jquery-ui.js?v=10.6.51209600.0 s1.2 KiB
/sites/default/files/images/2024-07/Accessibility - defa...1209600.0 s1.2 KiB
www.library.gov.au/core/assets/vendor/js-cookie/js.cookie.min.js?v=3.0.51209600.0 s1.0 KiB
/sites/default/files/images/2024-07/Reading rooms - Hove...1209600.0 s1.0 KiB
/sites/default/files/images/2024-07/Reading rooms - defa...1209600.0 s1.0 KiB
/sites/default/files/images/2024-07/Join the library - d...1209600.0 s1014 B
/sites/default/files/images/2024-07/Start researching - ...1209600.0 s994 B
/sites/default/files/images/2024-07/Accessibility - defa...1209600.0 s975 B
/sites/default/files/images/2024-07/Reading rooms - defa...1209600.0 s947 B
/sites/default/files/images/2024-07/Start researching - ...1209600.0 s942 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/core.css?tdrzxc1209600.0 s927 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/button.css?tdrzxc1209600.0 s924 B
/sites/default/files/images/2024-07/Reading rooms - Hove...1209600.0 s923 B
/sites/default/files/images/2024-07/Start researching - ...1209600.0 s913 B
/sites/default/files/images/2024-07/Join the library - d...1209600.0 s900 B
www.library.gov.au/core/assets/vendor/once/once.min.js?v=1.0.11209600.0 s888 B
/core/themes/stable9/css/system/components/hidden.module....1209600.0 s883 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/dialog.css?tdrzxc1209600.0 s871 B
/sites/default/files/images/2024-07/Accessibility - Hove...1209600.0 s860 B
www.library.gov.au/core/misc/debounce.js?v=10.6.51209600.0 s857 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/scroll-parent-min.js?v=10.6.51209600.0 s829 B
/modules/contrib/clientside_validation/clientside_validat...1209600.0 s821 B
www.library.gov.au/core/misc/dialog/dialog-deprecation.js?v=10.6.51209600.0 s819 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/focusable-min.js?v=10.6.51209600.0 s789 B
/sites/default/files/images/2024-07/Start researching - ...1209600.0 s789 B
www.library.gov.au/modules/custom/nla_notice_section/js/content_notice.js?v=1.11209600.0 s785 B
www.library.gov.au/modules/contrib/rate/js/unvote-helper.js?v=11209600.0 s785 B
/sites/default/files/images/2024-07/Accessibility - Hove...1209600.0 s749 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/keycode-min.js?v=10.6.51209600.0 s732 B
www.library.gov.au/core/modules/ckeditor5/js/ckeditor5.dialog.fix.js?v=10.6.51209600.0 s730 B
/sites/default/files/images/2024-07/Join the library - H...1209600.0 s712 B
www.library.gov.au/modules/contrib/rate/js/w-thumbsupdown.js?v=11209600.0 s710 B
/core/assets/vendor/jquery.ui/themes/base/controlgroup.cs...1209600.0 s698 B
/core/assets/vendor/jquery.ui/ui/form-reset-mixin-min.js?...1209600.0 s696 B
/sites/default/files/images/2024-07/Bookplate cafe - defa...1209600.0 s695 B
/sites/default/files/images/2024-07/Bookplate cafe - defa...1209600.0 s694 B
/sites/default/files/images/2024-07/Opening hours - defau...1209600.0 s674 B
/sites/default/files/images/2024-07/Join the library - H...1209600.0 s673 B
www.library.gov.au/modules/contrib/rate/css/w-thumbsupdown.css?tdrzxc1209600.0 s660 B
/sites/default/files/images/2024-07/Opening hours - defau...1209600.0 s657 B
/modules/contrib/search_api_autocomplete/css/search_api_a...1209600.0 s656 B
www.library.gov.au/core/misc/drupal.init.js?v=10.6.51209600.0 s655 B
/core/themes/stable9/css/core/components/ajax-progress.mo...1209600.0 s647 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/menu.css?tdrzxc1209600.0 s645 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/labels-min.js?v=10.6.51209600.0 s634 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/resizable.css?tdrzxc1209600.0 s608 B
/sites/default/files/images/2024-07/Opening hours - Hover...1209600.0 s604 B
www.library.gov.au/core/misc/jquery.tabbable.shim.js?v=10.6.51209600.0 s568 B
/sites/default/files/images/2024-07/Opening hours - Hover...1209600.0 s567 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/data-min.js?v=10.6.51209600.0 s565 B
/core/themes/stable9/css/core/components/progress.module....1209600.0 s560 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/unique-id-min.js?v=10.6.51209600.0 s557 B
/sites/default/files/images/2024-07/Bookplate cafe - Hove...1209600.0 s555 B
/core/assets/vendor/jquery.ui/ui/disable-selection-min.js...1209600.0 s549 B
/core/assets/vendor/jquery.ui/themes/base/checkboxradio.c...1209600.0 s547 B
www.library.gov.au/core/misc/drupalSettingsLoader.js?v=10.6.51209600.0 s532 B
/core/assets/vendor/jquery.ui/themes/base/autocomplete.cs...1209600.0 s520 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/jquery-patch-min.js?v=10.6.51209600.0 s516 B
/sites/default/files/images/2024-07/Bookplate cafe - Hove...1209600.0 s515 B
www.library.gov.au/sites/default/files/hotjar/hotjar.script.js?tdrzxc1209600.0 s514 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/plugin-min.js?v=10.6.51209600.0 s506 B
www.library.gov.au/core/assets/vendor/jquery.ui/ui/version-min.js?v=10.6.51209600.0 s503 B
www.library.gov.au/modules/contrib/block_ajax/css/ajax_blocks.css?tdrzxc1209600.0 s490 B
/core/themes/stable9/css/system/components/tablesort.modu...1209600.0 s479 B
/core/themes/stable9/css/system/components/system-status-...1209600.0 s458 B
/core/themes/stable9/css/system/components/system-status-...1209600.0 s448 B
/core/themes/stable9/css/system/components/resize.module....1209600.0 s428 B
/core/themes/stable9/css/system/components/js.module.css?...1209600.0 s424 B
/modules/contrib/better_exposed_filters/css/better_expose...1209600.0 s416 B
/core/themes/stable9/css/system/components/align.module.c...1209600.0 s401 B
/core/themes/stable9/css/core/components/autocomplete-loa...1209600.0 s399 B
/core/themes/stable9/css/system/components/clearfix.modul...1209600.0 s391 B
/core/themes/stable9/css/system/components/details.module...1209600.0 s391 B
/core/themes/stable9/css/system/components/nowrap.module....1209600.0 s380 B
/core/themes/stable9/css/system/components/system-status-...1209600.0 s341 B
/core/themes/stable9/css/system/components/reset-appearan...1209600.0 s340 B
/core/themes/stable9/css/system/components/container-inli...1209600.0 s332 B
/core/themes/stable9/css/system/components/position-conta...1209600.0 s328 B
/modules/contrib/paragraphs/css/paragraphs.unpublished.cs...1209600.0 s310 B
/core/themes/stable9/css/system/components/item-list.modu...1209600.0 s291 B
/core/themes/stable9/css/system/components/fieldgroup.mod...1209600.0 s227 B
www.library.gov.au/core/modules/ckeditor5/css/ckeditor5.dialog.fix.css?tdrzxc1209600.0 s227 B
/tr/?id=1572021990082000&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms19 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
/ajax/libs/font-awesome/4.7.0/fonts/fontawesome-webfont.w...90 ms

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]
items: [map[duration:1947.158 label:Time to first byte subpart:timeToFirstByte] map[duration:562.688 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-P
nodeLabel: The National Library of Australia acknowledges First Australians as the Traditi…
path: 1,HTML,1,BODY,2,DIV,0,DIV,4,DIV,1,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,P
selector: div.container > div.splash-screen-acknowledgement__content > div.splash-screen-acknowledgement__body > p
snippet: <p>

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
/css2?family=Open+Sans:ital,wght@0,300..800;1,300..800&fa...2.4 KiB296 ms
www.library.gov.au/themes/custom/nla/assets/css/bundle.css?tdrzxc57.5 KiB161 ms
cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css6.1 KiB281 ms
/core/themes/stable9/css/system/components/fieldgroup.mod...227 B
/modules/contrib/better_exposed_filters/css/better_expose...416 B
/core/themes/stable9/css/system/components/container-inli...332 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/dialog.css?tdrzxc871 B
/core/themes/stable9/css/system/components/tablesort.modu...479 B
/core/themes/stable9/css/system/components/resize.module....428 B
/core/themes/stable9/css/system/components/reset-appearan...340 B
/core/themes/stable9/css/system/components/item-list.modu...291 B
www.library.gov.au/modules/contrib/rate/css/w-thumbsupdown.css?tdrzxc660 B
/core/themes/stable9/css/system/components/system-status-...458 B
/core/themes/stable9/css/system/components/position-conta...328 B
/core/themes/stable9/css/system/components/clearfix.modul...391 B
/core/themes/stable9/css/system/components/system-status-...341 B
/core/themes/stable9/css/system/components/system-status-...448 B
/core/themes/stable9/css/system/components/hidden.module....883 B
/core/themes/stable9/css/system/components/details.module...391 B
/core/themes/stable9/css/system/components/align.module.c...401 B
/modules/contrib/search_api_autocomplete/css/search_api_a...656 B
/modules/contrib/paragraphs/css/paragraphs.unpublished.cs...310 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/theme.css?tdrzxc3.6 KiB
www.library.gov.au/core/modules/ckeditor5/css/ckeditor5.dialog.fix.css?tdrzxc227 B
/core/themes/stable9/css/system/components/nowrap.module....380 B
/core/themes/stable9/css/system/components/js.module.css?...424 B
/core/themes/stable9/css/core/components/autocomplete-loa...399 B
/core/themes/stable9/css/core/components/ajax-progress.mo...647 B
/core/themes/stable9/css/core/components/progress.module....560 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/button.css?tdrzxc924 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/resizable.css?tdrzxc608 B
/core/assets/vendor/jquery.ui/themes/base/checkboxradio.c...547 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/menu.css?tdrzxc645 B
/core/assets/vendor/jquery.ui/themes/base/autocomplete.cs...520 B
/core/assets/vendor/jquery.ui/themes/base/controlgroup.cs...698 B
www.library.gov.au/core/assets/vendor/jquery.ui/themes/base/core.css?tdrzxc927 B
www.library.gov.au/modules/contrib/block_ajax/css/ajax_blocks.css?tdrzxc490 B
www.library.gov.au/sites/default/files/hotjar/hotjar.script.js?tdrzxc514 B

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Two women are seated at a table covered in red cloth and laid with vintage lamp… div.card > div.image-card__image > div.image-with-caption > img.image
/sites/default/files/styles/news_media_listing/public/ima...819.3 KiB812.1 KiB
Black and white photo of Miriam Hyde sitting at a piano div.card > div.image-card__image > div.image-with-caption > img.image
/sites/default/files/styles/news_media_listing/public/ima...567.8 KiB536.1 KiB
A portrait of a smiling woman wearing glasses, a dark blue shirt and a silver p… div.card > div.image-card__image > div.image-with-caption > img.image
/sites/default/files/styles/news_media_listing/public/ima...543.1 KiB535.8 KiB
A woman stands at her front gate receiving mail from a postman on foot who wear… div.card > div.image-card__image > div.image-with-caption > img.image
/sites/default/files/styles/news_media_listing/public/ima...499.7 KiB492.4 KiB
A man wearing glasses, blue shirt and jacket, standing in front of a wrought ir… div.card > div.image-card__image > div.image-with-caption > img.image
/sites/default/files/styles/image_cards_dynamic/public/im...225.1 KiB211.6 KiB
Two handmade concertina style books laid out side by side div.card > div.image-card__image > div.image-with-caption > img.image
/sites/default/files/styles/image_cards_dynamic/public/im...215.4 KiB202.0 KiB
A painting of two stockman riding horses and holding whips high in the air, cap… div.card > div.image-card__image > div.image-with-caption > img.image
/sites/default/files/styles/news_media_listing/public/ima...62.6 KiB56.3 KiB
Black and white sketch of costume for the Princess-Mother in Swan Lake, with sw… div.swiper-slide > div.carousel-item > div.image-with-caption > img.image
/sites/default/files/styles/discover_carousel/public/imag...82.9 KiB30.4 KiB
Large wall of bookshelves with hundreds of colourful books div.swiper-slide > div.carousel-item > div.image-with-caption > img.image
/sites/default/files/styles/discover_carousel/public/imag...68.0 KiB15.5 KiB
An adult and child reading a book with a dog sitting between them. div.card > div.image-card__image > div.image-with-caption > img.image
/sites/default/files/styles/image_cards_dynamic/public/im...26.4 KiB14.7 KiB
People watch lion dances in Chinatown Plaza in Adelaide div.swiper-slide > div.carousel-item > div.image-with-caption > img.image
/sites/default/files/styles/discover_carousel/public/imag...60.4 KiB7.9 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.1 s
URLTime Spent
nla.gov.au/1.0 s
www.nla.gov.au/1.1 s
www.library.gov.au/0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 80 ms 34.6 KiB
URLTransfer SizeEst Savings
www.library.gov.au/core/misc/ajax.js?v=10.6.520.2 KiB14.2 KiB
www.library.gov.au/core/misc/jquery.form.js?v=4.3.015.3 KiB7.1 KiB
www.library.gov.au/core/misc/drupal.js?v=10.6.57.1 KiB5.6 KiB
www.library.gov.au/core/misc/position.js?v=10.6.56.6 KiB3.6 KiB
www.library.gov.au/core/misc/displace.js?v=10.6.52.9 KiB2.1 KiB
www.library.gov.au/core/misc/dialog/dialog.ajax.js?v=10.6.53.4 KiB2.0 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 80 ms 48.3 KiB
URLTransfer SizeEst Savings
www.library.gov.au/themes/custom/nla/assets/css/bundle.css?tdrzxc57.3 KiB48.3 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 80 ms 251.0 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-3SR5GMR9HT&cx=c&gtm=4e64h1166.5 KiB68.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-5RDVVN5N132.0 KiB64.3 KiB
www.library.gov.au/themes/custom/nla/assets/js/bundle.js?tdrzxc93.2 KiB45.1 KiB
script.hotjar.com/modules.6a0f3932cb1341a35c18.js56.1 KiB37.8 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB35.3 KiB

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.Not actionable

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 5.9 KiB
URLTransfer SizeEst Savings
.nice-select{-webkit-tap-highlight-color:rgba(0,0,0,0);background-color:#fff;border-radius:5px; … } …3.6 KiB3.0 KiB
/** * Swiper 11.2.10 * Most modern mobile touch slider and framework with hardware accelerated tr…4.2 KiB2.9 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/sites/default/files/styles/news_media_listing/public/ima...820.0 KiB
/sites/default/files/styles/news_media_listing/public/ima...568.3 KiB
/sites/default/files/styles/news_media_listing/public/ima...543.6 KiB
/sites/default/files/styles/news_media_listing/public/ima...500.3 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...383.0 KiB
www.library.gov.au/313.4 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...225.6 KiB
/sites/default/files/styles/image_cards_dynamic/public/im...215.8 KiB
www.googletagmanager.com/gtag/js?id=G-3SR5GMR9HT&cx=c&gtm=4e64h1166.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-5RDVVN5N132.4 KiB

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits
●Optimize DOM size
●Forced reflow
●Modern HTTP
●Optimize viewport for mobile
●Max Potential First Input Delay 50 ms
●User Timing marks and measures 5 user timings
●JavaScript execution time 0.1 s
●Minimizes main-thread work 1.0 s
●Avoid long main-thread tasks 1 long task found
●Avoid non-composited animations 4 animated elements found
●Image elements have explicit `width` and `height`
●Network Requests
●Network Round Trip Times 280 ms
●Server Backend Latencies 520 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 260 ms
●Avoid large layout shifts 6 layout shifts found
○INP breakdown
○LCP request discovery
97

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Local history div.swiper-slide > div.carousel-item > div.carousel-item__content > a.carousel-item__title
Photography div.swiper-slide > div.carousel-item > div.carousel-item__content > a.carousel-item__title
Family history and genealogy div.swiper-slide > div.carousel-item > div.carousel-item__content > a.carousel-item__title
Asia div.swiper-slide > div.carousel-item > div.carousel-item__content > a.carousel-item__title

These are opportunities to improve the legibility of your content.

○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
●`[role]`s are contained by their required parent element
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Input buttons have discernible text.
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●ARIA IDs are unique
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
77

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
Speaker with a line through it div.image-card__icons > div.image-card__icons-item > div.image-card__icons-item-images > img.icon-dark-theme
/sites/default/files/images/2026-02/quiet hours - dark_0.png32 x 32 (1.00)96 x 86 (1.12)

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
AttributionReporting
connect.facebook.net/en_US/fbevents.js line 279, col 769
●Uses HTTPS
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No browser errors logged to the console
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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