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.
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.
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.
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.
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 | |
|---|---|---|---|
Students relax on the grass in front of the University of Rochester library, en… div.grid-item > a.testimonials-items > div.testimonials-item--image > img | www.rochester.edu/assets/images/about/2024-10-31_Marc_Porosoff_class_0020.jpg | 304.1 KiB | 260.1 KiB |
A man plays the saxophone in a band at the University of Rochester, showcasing … section.hero > div#hero-random > div.hero-image > img | www.rochester.edu/assets/hero_images/2025/oct/spark-03.webp | 229.6 KiB | 114.6 KiB |
A young University of Rochester student smiles while working on a laptop, engag… div.grid-item > a.testimonials-items > div.testimonials-item--image > img | /assets/images/admissions/2025-09-09_BrandMarketing_D-736... | 130.1 KiB | 93.5 KiB |
A smiling individual wearing a green shirt in an outdoor setting. div.row > div.column > div.testimonials-featured-item--image > img | www.rochester.edu/assets/images/testimonial/2025/testimonial-mithi.webp | 112.8 KiB | 66.0 KiB |
A woman at a desk with a laptop, focused on her work, representing academic lif… div.grid-item > a.testimonials-items > div.testimonials-item--image > img | www.rochester.edu/assets/images/about/2019-06-25_Victoria_Dey_0881.1.jpg | 57.3 KiB | 34.1 KiB |
A female scientist in a lab coat conducts research in a laboratory at the Unive… div.grid-item > a.testimonials-items > div.testimonials-item--image > img | /assets/images/about/2023-08-17_iGEM_students_Meyer_lab_0... | 43.7 KiB | 26.0 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.
HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.
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 |
|---|---|---|
| www.rochester.edu/templatefiles/2025/js/main.min.js | 30.4 KiB | 1.6 s |
| www.rochester.edu/templatefiles/2025/css/main.min.css?v=1775851357498 | 25.0 KiB | 785 ms |
| /p.css?s=1&k=trg3udu&ht=tk&f=45406.45407.45408.45409.4541... | 172 B | 753 ms |
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 |
|---|---|
| rochester.edu/ | 1.5 s |
| www.rochester.edu/ | 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 |
|---|---|---|
| @charset "utf-8";.fa-solid,.fa-regular,.fa-brands,.fa-cla... | 33.2 KiB | 32.7 KiB |
| www.rochester.edu/templatefiles/2025/css/main.min.css?v=1775851357498 | 24.4 KiB | 18.5 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 |
|---|---|---|
| www.googletagmanager.com/gtm.js?id=GTM-TT7PP8Z | 154.1 KiB | 74.2 KiB |
| www.googletagmanager.com/gtag/js?id=G-NLJHQXH6R7&cx=c>m=4e64h1 | 175.6 KiB | 70.0 KiB |
| www.googletagmanager.com/gtag/js?id=AW-16785116022&cx=c>m=4e64h1 | 137.6 KiB | 54.0 KiB |
| connect.facebook.net/en_US/fbevents.js | 96.5 KiB | 32.6 KiB |
| www.rochester.edu/templatefiles/2025/js/main.min.js | 29.8 KiB | 21.4 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 |
|---|---|---|---|
| Unattributable | 811 ms | 85 ms | 0.0 ms |
| www.rochester.edu/ | 767 ms | 29 ms | 5.0 ms |
| www.googletagmanager.com/gtag/js?id=G-NLJHQXH6R7&cx=c>m=4e64h1 | 445 ms | 367 ms | 73 ms |
| www.googletagmanager.com/gtm.js?id=GTM-TT7PP8Z | 421 ms | 342 ms | 66 ms |
| www.googletagmanager.com/gtag/js?id=AW-16785116022&cx=c>m=4e64h1 | 360 ms | 289 ms | 69 ms |
| connect.facebook.net/en_US/fbevents.js | 184 ms | 133 ms | 48 ms |
| www.rochester.edu/templatefiles/2025/js/main.min.js | 183 ms | 53 ms | 12 ms |
| /signals/config/3883923348587710?v=2.9.303&r=stable&domai... | 172 ms | 143 ms | 27 ms |
| sc-static.net/scevent.min.js | 118 ms | 101 ms | 9.2 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 | 1.6 s |
| Other | 877 ms |
| Style & Layout | 563 ms |
| Script Parsing & Compilation | 321 ms |
| Rendering | 151 ms |
| Parse HTML & CSS | 50 ms |
Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.
Performance issues directly impact user engagement and conversion rates.
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.
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 |
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.