Lighthouse Mobile
· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.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.
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
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.
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.
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.
Performance issues directly impact user engagement and conversion rates.
Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size
Performance issues directly impact user engagement and conversion rates.
| URL | Resource Size | Est Savings | |
|---|---|---|---|
A group of people smiling at the Clean and Reliable Grid Affordability Act sign… div.field > figure.media > div.field > img.image-style-large | /sites/default/files/styles/large/public/2026-01/1500-900... | 189.7 KiB | 145.8 KiB |
A person stands in front of a solar panel with their arms crossed div.block > div.field > figure.media > img.image-style-original | /sites/default/files/styles/medium/public/2019-10/ucsusa_... | 50.5 KiB | 13.9 KiB |
A aerial view of New Orleans, Louisiana. div.field > figure.media > div.field > img.image-style-thumbnail | /sites/default/files/styles/thumbnail/public/2026-04/1500... | 35.7 KiB | 11.3 KiB |
a thumbnail of a poster on corporate accountability div.field > figure.media > div.field > img.image-style-thumbnail | /sites/default/files/styles/thumbnail/public/2026-03/ma-p... | 30.2 KiB | 5.8 KiB |
Can California’s Interconnection Reforms Deliver a Cleaner Grid? div.posts > div#post-97173 > a.img-wrapper > img | /wp-content/uploads/2026/04/Copy-of-Blog-Lead-Image-Templ... | 29.8 KiB | 5.4 KiB |
Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.
Performance issues directly impact user engagement and conversion rates.
Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Duration |
|---|---|---|
| cdn.optimizely.com/js/3747760300.js | 92.1 KiB | 2.4 s |
| /sites/default/files/js/js_A6H7Rex29pkhY37hi0OxjsdegfKQ8_... | 30.4 KiB | 451 ms |
| /sites/default/files/css/css_CK-LRT_1yKGV3VPtS-Xlppzsd2JE... | 20.2 KiB | 300 ms |
| /sites/default/files/css/css_OtJcwHerXdLJUIRGUEgICpAWNakm... | 1.5 KiB | 150 ms |
Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.
Performance issues directly impact user engagement and conversion rates.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Time Spent |
|---|---|
| ucsusa.org/ | 803 ms |
| www.ucs.org/ | 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.
Performance issues directly impact user engagement and conversion rates.
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.
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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| /sites/default/files/css/css_CK-LRT_1yKGV3VPtS-Xlppzsd2JE... | 19.8 KiB | 15.5 KiB |
| d1aqhv4sn5kxtx.cloudfront.net/actiontag/extra.min.css | 13.9 KiB | 13.8 KiB |
| d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.min.css | 11.8 KiB | 11.7 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Transfer Size | Est Savings |
|---|---|---|
| d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.js | 268.8 KiB | 194.2 KiB |
| www.googletagmanager.com/gtm.js?id=GTM-NB5C4Q | 177.2 KiB | 114.1 KiB |
| www.ucs.org/tm/ | 185.4 KiB | 75.5 KiB |
| www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c>m=4e64k0h1 | 181.0 KiB | 69.3 KiB |
| www.ucs.org/tm/gtd?id=DC-8188095&cx=c>m=4e64k0h1 | 134.9 KiB | 68.0 KiB |
| www.ucs.org/tm/gtd?id=AW-1071979118&cx=c>m=4e64k0h1 | 149.5 KiB | 66.5 KiB |
| cdn.optimizely.com/js/3747760300.js | 91.5 KiB | 42.7 KiB |
| connect.facebook.net/en_US/fbevents.js | 96.5 KiB | 34.3 KiB |
| js.verygoodvault.com/vgs-collect/2.18.4/vgs-collect.js | 43.1 KiB | 26.1 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.
Performance issues directly impact user engagement and conversion rates.
| URL | Total CPU Time | Script Evaluation | Script Parse |
|---|---|---|---|
| d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.js | 874 ms | 616 ms | 144 ms |
| www.ucs.org/ | 659 ms | 17 ms | 5.2 ms |
| Unattributable | 610 ms | 29 ms | 0.0 ms |
| www.ucs.org/tm/ | 601 ms | 497 ms | 91 ms |
| www.ucs.org/tm/?id=G-VB9DKE4V36&cx=c>m=4e64k0h1 | 509 ms | 428 ms | 76 ms |
| cdn.optimizely.com/js/3747760300.js | 480 ms | 406 ms | 40 ms |
| www.ucs.org/tm/gtd?id=AW-1071979118&cx=c>m=4e64k0h1 | 305 ms | 238 ms | 64 ms |
| www.ucs.org/tm/gtd?id=DC-8188095&cx=c>m=4e64k0h1 | 272 ms | 214 ms | 54 ms |
| connect.facebook.net/en_US/fbevents.js | 194 ms | 137 ms | 56 ms |
| /signals/config/625465517575530?v=2.9.303&r=stable&domain... | 163 ms | 127 ms | 25 ms |
| www.googletagmanager.com/gtm.js?id=GTM-NB5C4Q | 113 ms | 33 ms | 79 ms |
| js.verygoodvault.com/vgs-collect/2.18.4/vgs-collect.js | 81 ms | 63 ms | 18 ms |
| www.ucs.org/themes/custom/ucstheme/js/theme.js?v=1.x | 78 ms | 68 ms | 2.3 ms |
| /sites/default/files/js/js_A6H7Rex29pkhY37hi0OxjsdegfKQ8_... | 64 ms | 41 ms | 15 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
Performance issues directly impact user engagement and conversion rates.
| Category | Time Spent |
|---|---|
| Script Evaluation | 3.0 s |
| Script Parsing & Compilation | 690 ms |
| Other | 680 ms |
| Style & Layout | 531 ms |
| Garbage Collection | 131 ms |
| Parse HTML & CSS | 86 ms |
| Rendering | 38 ms |
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
Performance issues directly impact user engagement and conversion rates.
| Failure reason | Failure type |
|---|---|
| The page was evicted from back/forward cache because an active network request involved a redirect. | Not actionable |
Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions
Performance issues directly impact user engagement and conversion rates.
| URL | |
|---|---|
Investors Move Fight Over Fossil Fuel Dangers From the Boardroom to the Courtro… div.posts > div#post-97220 > a.img-wrapper > img | /wp-content/uploads/2026/04/Blog-Thumbnail-BP-logo-greenp... |
Terrible Team: Super El Niño and Climate Change Could Lead to Record-Breaking G… div.posts > div#post-97193 > a.img-wrapper > img | /wp-content/uploads/2021/09/worker-silhouette-drinking-wa... |
Can California’s Interconnection Reforms Deliver a Cleaner Grid? div.posts > div#post-97173 > a.img-wrapper > img | /wp-content/uploads/2026/04/Copy-of-Blog-Lead-Image-Templ... |
Say it with science. div.wrapper-lg > div#block-footerstorepromo > div.clearfix > img | www.ucs.org/sites/default/files/2019-10/store-promo-small.png |
More information about the performance of your application. These numbers don't directly affect the Performance score.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
DONATE div.wrapper-lg > div.mobile-menu-items > div.donate-alt > a.btn-donate-sm |
DONATE div.block > div.clearfix > p > a.btn |
These are opportunities to improve the legibility of your content.
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.
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
Tell Congress: Protect Climate Research div.field > div.node > div.node__content > h3 |
These are opportunities to improve keyboard navigation in your application.
Best Practices
General
Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.
Performance issues directly impact user engagement and conversion rates.
| Deprecation / Warning | Source |
|---|---|
| AttributionReporting | connect.facebook.net/en_US/fbevents.js line 279, col 769 |
Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit
Performance issues directly impact user engagement and conversion rates.
| Source | Description |
|---|---|
Access to XMLHttpRequest at 'https://actions.everyaction.com/v1/Forms/riz_81HSRkGMC2loQcyxiQ2' from origin 'https://www.ucs.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. | |
Access to XMLHttpRequest at 'https://actions.everyaction.com/v1/Forms/riz_81HSRkGMC2loQcyxiQ2' from origin 'https://www.ucs.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. | |
Access to XMLHttpRequest at 'https://actions.everyaction.com/v1/Forms/riz_81HSRkGMC2loQcyxiQ2' from origin 'https://www.ucs.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. | |
Access to XMLHttpRequest at 'https://actions.everyaction.com/v1/Forms/riz_81HSRkGMC2loQcyxiQ2' from origin 'https://www.ucs.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. | |
Access to XMLHttpRequest at 'https://advocator.ngpvan.com/https%3a%2f%2fsecure.everyaction.com%2fv1%2fForms%2fGQrln-2QfU-0teQoe1VjgQ2/ngpForm' from origin 'https://www.ucs.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. | |
Access to XMLHttpRequest at 'https://advocator.ngpvan.com/https%3a%2f%2fsecure.everyaction.com%2fv1%2fForms%2fGQrln-2QfU-0teQoe1VjgQ2/ngpForm' from origin 'https://www.ucs.org' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. | |
Failed to load resource: net::ERR_FAILED | |
Failed to load resource: net::ERR_FAILED | |
Failed to load resource: net::ERR_FAILED | |
Failed to load resource: net::ERR_FAILED | |
Failed to load resource: net::ERR_FAILED | |
Failed to load resource: net::ERR_FAILED | |
d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.js line 669, col 16611 | fetching error [object Object] |
d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.js line 669, col 16611 | fetching error [object Object] |
d1aqhv4sn5kxtx.cloudfront.net/actiontag/at.js line 669, col 16611 | fetching error [object Object] |
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.
Performance issues directly impact user engagement and conversion rates.
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
Descriptive link text helps search engines understand your content. Learn how to make links more accessible.
Performance issues directly impact user engagement and conversion rates.
| Link destination | Link Text |
|---|---|
| www.ucs.org/about | LEARN MORE |
| blog.ucs.org/ | READ MORE |
| www.ucs.org/about | LEARN MORE |
| www.ucs.org/about/ucs-privacy-statement.html | Learn more |
Format your HTML in a way that enables crawlers to better understand your app’s content.