Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

Request	Cache TTL	Transfer Size
i.ytimg.com/vi_webp/ITnv867DReU/sddefault.webp	7200.0 s	15.7 KiB
/Universal-Federated-Analytics-Min.js?agency=DOE&subagenc...	0.0 ms	9.4 KiB
dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js	0.0 ms	4.5 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	10.7 KiB
/articles/all/9/0/none/www.llnl.gov?callback=eventsLoaded...	300.0 s	4.3 KiB
/ytc/AIdro_nK7B85DynUuR4Tuolcb9v1HLL7dR4woMc6oHskgoJ9GDU=...	86400.0 s	4.0 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	86400.0 s	0 B
static.doubleclick.net/instream/ad_status.js	900.0 s	0 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.

URL	Est Savings
www.llnl.gov/themes/custom/sienna/fonts/OpenSans-Regular.ttf	750 ms
www.llnl.gov/themes/custom/sienna/webfonts/fa-regular-400.woff2	750 ms
www.llnl.gov/themes/custom/sienna/fonts/OpenSans-Bold.ttf	725 ms
www.llnl.gov/themes/custom/sienna/webfonts/fa-solid-900.woff2	725 ms
/themes/custom/sienna/fonts/source-sans-pro/sourcesanspro...	720 ms
www.llnl.gov/themes/custom/sienna/fonts/glyphicons-halflings-regular.woff2	710 ms
/themes/custom/sienna/fonts/source-sans-pro/sourcesanspro...	640 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	10 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:20.533 source:map[column:3283 line:5 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMji7E8hppr8.js?scope=footer&delta=2&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:175.967 source:map[type:text value:[unattributed]]] map[reflowTime:1.236 source:map[column:82611 line:4 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMji7E8hppr8.js?scope=footer&delta=2&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:0.078 source:map[column:58331 line:4 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMji7E8hppr8.js?scope=footer&delta=2&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:0.13 source:map[column:62451 line:4 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMji7E8hppr8.js?scope=footer&delta=2&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:20.533 source:map[column:55479 line:4 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMji7E8hppr8.js?scope=footer&delta=2&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:0.823 source:map[column:50335 line:2 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcADmeP8PWbs0.js?scope=footer&delta=0&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:0.491 source:map[column:50393 line:2 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcADmeP8PWbs0.js?scope=footer&delta=0&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:0.405 source:map[column:50457 line:2 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcADmeP8PWbs0.js?scope=footer&delta=0&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:0.21 source:map[column:49637 line:2 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcADmeP8PWbs0.js?scope=footer&delta=0&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:0.152 source:map[column:49615 line:2 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcADmeP8PWbs0.js?scope=footer&delta=0&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]] map[reflowTime:0.53 source:map[column:51395 line:2 type:source-location url:https://www.llnl.gov/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcADmeP8PWbs0.js?scope=footer&delta=0&language=en&theme=sienna&include=eJxlkFFywzAIRC-kWEfSYIk4ODJoAMXJ7es2tetpvtC-XZgdgRl6Ip4xu2icbcgOyRXynXgK8GGv65oUCxpNHEYRty3c4vFKTXFbID-ZTZo8UE_ERapTC1kUY9HeoA6FoMo0wAzPgE-vxPfd-pWhVq4JqqOCk7DFl3TvI16Owj-JLOzInm59jIyrvakhaL7F9-gUFK1tN-iBaUHu8Z8ejrbBCJkhAkN9OWXbwXVLoH6Hd7LgBGetwEWWy7i1m1Q6l93othYLK45X0SX9fcwH-QJlRaXU urlProvider:network]]]

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.

	URL	Resource Size	Est Savings
LAWRENCE LIVERMORE NATIONAL LABORATORY Science and Technology on a Mission `div.content > div.field > div.widget-row > div.hero-banner`	/sites/www/files/styles/orig/public/2023-10/www-hero-1(1)...	1.2 MiB	977.8 KiB
computing `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...	233.5 KiB	212.9 KiB
LLNL researchers invented a high-throughput platform that screens proteins for … `div.col-md-4 > div.panel > div.panel-body > img.img-responsive`	/sites/contenthub/files/styles/scaled_3_2_ratio_at_350x23...	121.3 KiB	108.1 KiB
Engineering `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...	145.6 KiB	93.9 KiB
The Joint Actinide Shock Physics Experimental Research (JASPER) facility at the… `div.col-md-4 > div.panel > div.panel-body > img.img-responsive`	/sites/contenthub/files/styles/scaled_3_2_ratio_at_350x23...	106.6 KiB	93.3 KiB
Lawrence Livermore National Laboratory Materials Engineering Division Leader Ch… `div.col-md-4 > div.panel > div.panel-body > img.img-responsive`	/sites/contenthub/files/styles/scaled_3_2_ratio_at_350x23...	106.0 KiB	92.7 KiB
global security `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...	102.4 KiB	51.6 KiB
NIF & Photon Science `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...	99.3 KiB	50.0 KiB
Scientist standing by weaponhead `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...	80.9 KiB	40.7 KiB
Technician adjusting equipment `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2023-01/about-our-org...	38.2 KiB	17.2 KiB
LLNL `div#footer-logo-wrapper > div#footer-logo > a.llnl > img`	www.llnl.gov/themes/custom/sienna/assets/images/llnl-logo-dark.png	6.3 KiB	5.2 KiB

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:874.137 label:Time to first byte subpart:timeToFirstByte] map[duration:1469.572 label:Resource load delay subpart:resourceLoadDelay] map[duration:757.349 label:Resource load duration subpart:resourceLoadDuration] map[duration:69.66 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-DIV

nodeLabel: LAWRENCE LIVERMORE NATIONAL LABORATORY Science and Technology on a Mission

path: 1,HTML,1,BODY,2,DIV,0,DIV,1,DIV,0,DIV,0,SECTION,1,DIV,0,DIV,1,ARTICLE,0,DIV,0,DIV,1,DIV,1,DIV

selector: div.content > div.field > div.widget-row > div.hero-banner

snippet: <div class="hero-banner hero-banner-front advanced-widget-row-image container text-lig…" style="background-image: url("/sites/www/files/styles/orig/public/2023-10/www-her…");">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-DIV

nodeLabel: LAWRENCE LIVERMORE NATIONAL LABORATORY Science and Technology on a Mission

path: 1,HTML,1,BODY,2,DIV,0,DIV,1,DIV,0,DIV,0,SECTION,1,DIV,0,DIV,1,ARTICLE,0,DIV,0,DIV,1,DIV,1,DIV

selector: div.content > div.field > div.widget-row > div.hero-banner

snippet: <div class="hero-banner hero-banner-front advanced-widget-row-image container text-lig…" style="background-image: url("/sites/www/files/styles/orig/public/2023-10/www-her…");">

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.

URL	Transfer Size	Duration
/sites/www/files/css/css_4GgOo88JtCSUl2r1PteeXfdq8RXHLjH5...	51.4 KiB	602 ms
/sites/www/files/css/css_1hneLw5EaXrWX7-Y2sIa3W4nTldQTzXr...	85.7 KiB	1.2 s
/sites/www/files/css/css_GEy-hmvX-LTOlMQBCa2PlvWQbODJBJ8y...	529 B
/sites/www/files/css/css_ucSwS3ng_q082DKtIuNSXXcMiF1Vps8O...	20.5 KiB	301 ms
/sites/www/files/asset_injector/css/home_v2-be9db84e8601b...	9.0 KiB
/sites/www/files/asset_injector/css/v2_mobile-9978a02ef09...	6.1 KiB	151 ms
/sites/www/files/css/css_ciL5r_IaD01R5JQ6PebuF3HhwZ9ZefXg...	1.9 KiB

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

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

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: 1.2 s

URL	Time Spent
llnl.gov/	1.2 s
www.llnl.gov/	0.0 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

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: 1.2 s 150.5 KiB

URL	Transfer Size	Est Savings
/sites/www/files/css/css_1hneLw5EaXrWX7-Y2sIa3W4nTldQTzXr...	85.6 KiB	80.1 KiB
/sites/www/files/css/css_4GgOo88JtCSUl2r1PteeXfdq8RXHLjH5...	51.2 KiB	50.6 KiB
/sites/www/files/css/css_ucSwS3ng_q082DKtIuNSXXcMiF1Vps8O...	20.4 KiB	19.8 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: 900 ms 185.6 KiB

URL	Transfer Size	Est Savings
/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcAD...	154.6 KiB	105.1 KiB
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L	147.0 KiB	60.2 KiB
/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMj...	29.4 KiB	20.3 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
www.llnl.gov/	1.5 s	6.3 ms	3.9 ms
Unattributable	1.0 s	7.3 ms	0.0 ms
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L	644 ms	561 ms	73 ms
/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcAD...	641 ms	476 ms	101 ms
/sites/www/files/js/js_k8oXBMlzypWW_AQwngBnyY54k4NQ1OjSMj...	160 ms	55 ms	17 ms
/sites/www/files/css/css_1hneLw5EaXrWX7-Y2sIa3W4nTldQTzXr...	89 ms	0.0 ms	0.0 ms
dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js	86 ms	82 ms	2.7 ms
/sites/www/files/css/css_4GgOo88JtCSUl2r1PteeXfdq8RXHLjH5...	66 ms	0.0 ms	0.0 ms
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...	66 ms	39 ms	5.1 ms
/Universal-Federated-Analytics-Min.js?agency=DOE&subagenc...	58 ms	49 ms	8.1 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	1.3 s
Other	1.2 s
Style & Layout	1.0 s
Rendering	329 ms
Parse HTML & CSS	261 ms
Script Parsing & Compilation	221 ms
Garbage Collection	99 ms

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 2.3 KiB

URL	Transfer Size	Est Savings
/sites/www/files/asset_injector/css/home_v2-be9db84e8601b...	9.0 KiB	2.3 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.

URL	Transfer Size
/sites/www/files/styles/orig/public/2023-10/www-hero-1(1)...	1.2 MiB
www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js	436.0 KiB
www.llnl.gov/themes/custom/sienna/webfonts/fa-regular-400.woff2	325.6 KiB
www.llnl.gov/themes/custom/sienna/webfonts/fa-solid-900.woff2	253.5 KiB
/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...	233.9 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021...	183.1 KiB
www.llnl.gov/themes/custom/sienna/assets/images/doe_small.png	155.3 KiB
/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcAD...	154.8 KiB
www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L	147.4 KiB
/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...	145.9 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
U.S. DOE `div.row > div#footer-affiliates > a.doe > img`	www.llnl.gov/themes/custom/sienna/assets/images/doe_small.png
global security `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...
Scientist standing by weaponhead `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...
Engineering `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...
NIF & Photon Science `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...
Man inspecting cable `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2023-03/llnl-homepage...
Technician adjusting equipment `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2023-01/about-our-org...
computing `div.widget-image-with-text > div.row > div.col-md-4 > img.img-responsive`	/sites/www/files/styles/orig/public/2021-11/LLNL-homepage...
Lawrence Livermore National Laboratory Materials Engineering Division Leader Ch… `div.col-md-4 > div.panel > div.panel-body > img.img-responsive`	/sites/contenthub/files/styles/scaled_3_2_ratio_at_350x23...
LLNL researchers invented a high-throughput platform that screens proteins for … `div.col-md-4 > div.panel > div.panel-body > img.img-responsive`	/sites/contenthub/files/styles/scaled_3_2_ratio_at_350x23...
The Joint Actinide Shock Physics Experimental Research (JASPER) facility at the… `div.col-md-4 > div.panel > div.panel-body > img.img-responsive`	/sites/contenthub/files/styles/scaled_3_2_ratio_at_350x23...
NNSA `div.row > div#footer-affiliates > a.nnsa > img`	www.llnl.gov/themes/custom/sienna/assets/images/nnsa.png
LLNL `div#footer-logo-wrapper > div#footer-logo > a.llnl > img`	www.llnl.gov/themes/custom/sienna/assets/images/llnl-logo-dark.png
U.S. flag `header.usa-banner__header > div.usa-banner__inner > div.grid-col-auto > img.usa-banner__header-flag`	www.llnl.gov/themes/custom/sienna/assets/images/us_flag_small.png
LLNS `div.row > div#footer-affiliates > a.llns > img`	www.llnl.gov/themes/custom/sienna/assets/images/llns.png
LLNL Logo `div.llnl-logo-wrap > div#llnl-logo > a > img`	www.llnl.gov/themes/custom/sienna/assets/images/llnl-logo.png
Scientist standing next to machine in facility `div.paragraph > div.field > div.embedded-entity > img.img-responsive`

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

●Layout shift culprits

●Optimize DOM size

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●User Timing marks and measures 9 user timings

●Avoid long main-thread tasks 13 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 140 ms

●Server Backend Latencies 740 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 20 ms

●Avoid large layout shifts 3 layout shifts found

○INP breakdown

○Avoid non-composited animations

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.

ARIA

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
LLNL.GOV Our Purpose Our Science and Technology Join Our Team Partner with Us N… `div.dialog-off-canvas-main-canvas > footer.footer > div.container > div#footer-accordion`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
STAY CONNECTED `div.container > div#footer-stay-connected > div.footer-social-media > h4`

These are opportunities to improve keyboard navigation in your application.

○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

●`[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

●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

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<frame>` or `<iframe>` elements have a title

●`<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

●Touch targets have sufficient size and spacing.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●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

○ARIA IDs are unique

○No form fields have multiple labels

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<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.

○No element has a `[tabindex]` value greater than 0

○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.

○Identical links have the same purpose.

○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.

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
LLNL Logo `div.llnl-logo-wrap > div#llnl-logo > a > img`	www.llnl.gov/themes/custom/sienna/assets/images/llnl-logo.png	40 x 39	40 x 39	60 x 59

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Map URL
/sites/www/files/js/js_MEw8oE9xi3neG9cgAsKjwho3FHhXukrcAD...
/Universal-Federated-Analytics-Min.js?agency=DOE&subagenc...	dap.digitalgov.gov/Federated.js.map

●Uses HTTPS

●Avoids deprecated APIs

●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

●Displays images with correct aspect ratio

●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

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

100

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.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●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`