C — https://imperial.ac.uk | BeaverCheck Audit

Site Health

Score: 77 / 100

Based on 8 categories, 0 sections

Decent speed, but optimizing further could improve engagement.

Good foundation, but a few gaps could be exploited.

Several issues make your site difficult for assistive technology users.

Solid SEO basics — a few optimizations could boost rankings.

Solid infrastructure — fast server responses across the board.

Several regulatory requirements are not yet met.

Missing metadata means poor previews on social media and search.

Reasonable footprint with room for optimization.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Drupal · 219 peers

You 77

Avg 73

At average

0 50 100

Better than 83% of Drupal sites See full Drupal benchmark →

Google Search Console · 2306 peers

You 77

Avg 73

At average

0 50 100

Better than 82% of Google Search Console sites See full Google Search Console benchmark →

Top Priorities (5)

No <main> landmark found

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Landmark Structure

No favicon or icon links detected

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Favicon & Branding

40 third-party resources (100% of weight)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Inventory

Cross-Origin-Embedder-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

Cross-Origin-Opener-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fimperial.ac.uk)](https://beavercheck.com/results/f986746c-0f67-43b6-9ff2-e62caae06f3c)

HTML

<a href="https://beavercheck.com/results/f986746c-0f67-43b6-9ff2-e62caae06f3c"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fimperial.ac.uk" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fimperial.ac.uk

This badge auto-updates with your latest scan result.

What fixing these means

Your site performs reasonably well, but a few targeted fixes could meaningfully improve results. Your LCP of 13.5s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your audience reach.

2 accessibility issues exclude users who rely on assistive technology.

Your LCP is 13.5s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.

2 security gaps detected — browsers may warn visitors about your site.

Conversion Barriers

3 critical 5 warning

8 barrier(s) likely increasing bounce by ~37%.

Speed (2)

Page takes 13.5s to load

+12% bounce

Users abandon at ~3s — you're 11.0s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Page feels frozen for 772ms

+5% bounce

Clicks on the primary CTA are ignored while JavaScript runs

Fix: Break up long tasks; defer non-critical JavaScript to post-hydration

Trust (1)

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Usability (1)

No viewport meta tag

+15% bounce

Mobile browsers render at desktop width and shrink — text unreadable, tap targets miniature

Fix: Add <meta name="viewport" content="width=device-width, initial-scale=1">

Content (3)

No Open Graph tags

+2% bounce

Links shared on LinkedIn / Slack / Facebook show bare URLs — referral clicks drop

Fix: Add og:title, og:description, og:image, og:url to the page head

No structured data

+2% bounce

No rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices

Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)

Thin content

+3% bounce

Under 300 words — visitors bounce looking for substance, search engines rank competitors first

Fix: Add a substantive FAQ, product detail, or case-study section

Navigation (1)

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

£450 investment → £0.38/month returns + GBP 18,050,000 risk avoided

Payback period: > 2 years First-year ROI: -99%

Investment

£450

6h · 5 findings

Monthly returns

£0.38 /mo

~£4.57 / year

Bandwidth savings £0.38

Regulatory risk avoided

GBP 18,050,000

if kept compliant

UK GDPR GBP 17,500,000
PECR GBP 500,000
Equality Act 2010 GBP 50,000

£75 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

£450

6.0 developer hours at £75/hr

Based on United Kingdom rates (£75/hr)

Quick wins

£75 2 fixes in ~60 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

£ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

£1,504,167 / month at risk

~£18,050,005 / year if left unfixed

Compliance Risk

£18,050,000

UK GDPRPECREquality Act 2010

No privacy policy link detected
UK GDPR: GBP 10,000 – GBP 17,500,000
Trackers detected but no cookie policy found
UK GDPR: GBP 10,000 – GBP 17,500,000
Trackers detected but no cookie policy found
PECR: GBP 1,000 – GBP 500,000

+5 more

Bandwidth Waste

£0.38 /mo

6044.5 MB/mo × 0.063 GBP/GB

Optimize transfer: save ~604 KB per page load
Saves £0.38/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 2 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

100

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.01 s

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

13.53 s

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

772 ms

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

0.052

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

5.51 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.

13.64 s

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

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

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
/fit-in/1440x9999999/prod01/channel_3/media/images/square...	1800.0 s	254.4 KiB
/fit-in/1350x1350/filters:format(webp)/prod01/channel_3/m...	1800.0 s	217.9 KiB
/fit-in/1440x9999/filters:quality(70)/filters:format(webp...	1800.0 s	135.4 KiB
/fit-in/1440x9999999/prod01/channel_3/media/images/banner...	1800.0 s	106.1 KiB
cdn-ukwest.onetrust.com/scripttemplates/202511.1.0/otBannerSdk.js	86400.0 s	124.4 KiB
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
/consent/6d9efb9d-b605-406f-b8b3-c9644859d064/OtAutoBlock.js	86400.0 s	3.4 KiB
cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svg	86400.0 s	2.5 KiB
/logos/d4255fa8-4928-4eea-acf7-b5f7df6d256e/018de596-57ff...	86400.0 s	1.0 KiB

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.

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

items: [map[reflowTime:31.382 source:map[column:18257 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:4.002 source:map[column:19940 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:1.354 source:map[column:20647 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:0.312 source:map[column:20678 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:2.838 source:map[column:22446 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:13.588 source:map[type:text value:[unattributed]]]]

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
main#content > div.container > div.banner > img `main#content > div.container > div.banner > img`	/fit-in/1440x9999999/prod01/channel_3/media/images/square...	253.4 KiB	232.7 KiB
div.flexible-hero > div.flexible-hero__media > picture > img `div.flexible-hero > div.flexible-hero__media > picture > img`	/fit-in/1350x1350/filters:format(webp)/prod01/channel_3/m...	217.0 KiB	157.4 KiB
div.content-overlap__media > div > picture.custom > img `div.content-overlap__media > div > picture.custom > img`	/fit-in/1440x9999/filters:quality(70)/filters:format(webp...	134.6 KiB	125.5 KiB
main#content > div.container > section.landing-full-img > img `main#content > div.container > section.landing-full-img > img`	/fit-in/1440x9999999/prod01/channel_3/media/images/banner...	105.3 KiB	98.3 KiB

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
/consent/6d9efb9d-b605-406f-b8b3-c9644859d064/OtAutoBlock.js	3.4 KiB	831 ms
www.imperial.ac.uk/assets/website/stylesheets/css/screen.2.3.5.css	84.3 KiB	1.2 s
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	9.1 KiB	166 ms
www.imperial.ac.uk/assets/website/js/lib/jquery3.min.js	30.5 KiB	892 ms

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.imperial.ac.uk/	http/1.1
www.imperial.ac.uk/assets/website/fonts/icons/fonts/imperial-icons.woff?vrmf2d	http/1.1
www.imperial.ac.uk/assets/website/fonts/imperial-sans/ImperialText-VF.woff2	http/1.1
www.imperial.ac.uk/assets/website/stylesheets/css/screen.2.3.5.css	http/1.1
www.imperial.ac.uk/assets/website/js/lib/jquery3.min.js	http/1.1
www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js	http/1.1
www.imperial.ac.uk/assets/website/stylesheets/css/print.2.3.5.css	http/1.1
www.imperial.ac.uk/assets/website/images/svg/icons.svg#search	http/1.1
www.imperial.ac.uk/assets/website/js/require/vendor/jquery3-migrate.js	http/1.1
www.imperial.ac.uk/assets/website/images/favicon/favicon.ico	http/1.1
www.imperial.ac.uk/assets/website/images/favicon/favicon.svg	http/1.1

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: 833 ms

URL	Time Spent
imperial.ac.uk/	833 ms
www.imperial.ac.uk/	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

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: 340 ms 101.1 KiB

URL	Transfer Size	Est Savings
www.imperial.ac.uk/assets/website/stylesheets/css/screen.2.3.5.css	83.5 KiB	78.4 KiB
	25.1 KiB	22.7 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.

Why this matters

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Estimated savings: 1.9 s 367.3 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-LME5ZDDFS0&cx=c&gtm=4e64h1	171.3 KiB	68.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-NDH95W87	190.8 KiB	67.2 KiB
www.googletagmanager.com/gtag/js?id=AW-17946844669&cx=c&gtm=4e64h1	145.0 KiB	65.4 KiB
www.googletagmanager.com/gtag/js?id=AW-11002703160&cx=c&gtm=4e64h1	145.5 KiB	65.4 KiB
cdn-ukwest.onetrust.com/scripttemplates/202511.1.0/otBannerSdk.js	124.3 KiB	64.2 KiB
www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js	51.2 KiB	36.8 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.googletagmanager.com/gtm.js?id=GTM-NDH95W87	465 ms	373 ms	57 ms
Unattributable	343 ms	11 ms	0.0 ms
www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js	284 ms	104 ms	15 ms
cdn-ukwest.onetrust.com/scripttemplates/202511.1.0/otBannerSdk.js	258 ms	180 ms	37 ms
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	230 ms	211 ms	3.8 ms
cdnjs.cloudflare.com/ajax/libs/gsap/3.10.4/gsap.min.js	195 ms	39 ms	7.3 ms
www.googletagmanager.com/gtag/js?id=G-LME5ZDDFS0&cx=c&gtm=4e64h1	168 ms	130 ms	37 ms
www.imperial.ac.uk/	165 ms	5.7 ms	1.4 ms
www.googletagmanager.com/gtag/js?id=AW-17946844669&cx=c&gtm=4e64h1	139 ms	107 ms	30 ms
www.googletagmanager.com/gtag/js?id=AW-11002703160&cx=c&gtm=4e64h1	137 ms	107 ms	29 ms
www.imperial.ac.uk/assets/website/js/lib/jquery3.min.js	79 ms	69 ms	6.6 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	1.4 s
Other	475 ms
Style & Layout	259 ms
Script Parsing & Compilation	238 ms
Parse HTML & CSS	75 ms
Garbage Collection	54 ms
Rendering	42 ms

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: 0.0 ms 6.2 KiB

URL	Transfer Size	Est Savings
www.imperial.ac.uk/assets/website/js/require/vendor/jquery3-migrate.js	14.4 KiB	6.2 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
div.content-overlap__media > div > picture.custom > img `div.content-overlap__media > div > picture.custom > img`	/fit-in/1440x9999/filters:quality(70)/filters:format(webp...

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

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●LCP request discovery

●Optimize viewport for mobile

●Minify CSS

●Avoids enormous network payloads Total size was 1,968 KiB

●User Timing marks and measures 5 user timings

●Avoid long main-thread tasks 12 long tasks found

●Avoid non-composited animations 2 animated elements found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 50 ms

●Server Backend Latencies 30 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 50 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

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

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Blackboard `div.flow-s > ul > li > a`
Jobs `div.flow-s > ul > li > a`
Library services `div.flow-s > ul > li > a`
Outlook email online `div.flow-s > ul > li > a`
Engineering `div.flow-s > ul > li > a`
Medicine `div.flow-s > ul > li > a`
Natural Sciences `div.flow-s > ul > li > a`
Imperial Business School `div.flow-s > ul > li > a`
Admin and support services `div.flow-s > ul > li > a`
Networks and Centres `div.flow-s > ul > li > a`
Research groups `div.flow-s > ul > li > a`
Search all staff `div.flow-s > ul > li > a`
Imperial College Academic Health Science Centre `div.flow-s > ul > li > a`
Imperial College Health Partners `div.flow-s > ul > li > a`
Imperial College Healthcare NHS Trust `div.flow-s > ul > li > a`
Imperial Consultants `div.flow-s > ul > li > a`

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Menu `header.header > div.header__inner > div.header__buttons > button.header__nav-open`
Cookie Policy `div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a.ot-cookie-policy-link`

○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]` 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.

●Select elements have associated label elements.

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[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

●`<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

●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.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○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 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

○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.

100

Best Practices

●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

●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

●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

○Use a strong HSTS policy

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○robots.txt is valid

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

908 ms

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

1.38 s

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

12 ms

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

0.001

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

908 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.42 s

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.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

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
/fit-in/1920x1080/filters:format(webp)/filters:quality(70...	1800.0 s	226.1 KiB
/fit-in/720x9999999/filters:quality(70)/filters:format(we...	1800.0 s	112.7 KiB
/fit-in/1440x9999999/prod01/channel_3/media/images/banner...	1800.0 s	106.1 KiB
/filters:format(webp)/fit-in/720x9999999/prod01/channel_3...	1800.0 s	100.8 KiB
/fit-in/720x9999999/filters:quality(70)/filters:format(we...	1800.0 s	95.2 KiB
/fit-in/720x9999999/filters:quality(70)/filters:format(we...	1800.0 s	68.4 KiB
cdn-ukwest.onetrust.com/scripttemplates/202511.1.0/otBannerSdk.js	86400.0 s	124.4 KiB
/fit-in/720x99999/filters:quality(70)/filters:format(webp...	1800.0 s	48.1 KiB
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
/consent/6d9efb9d-b605-406f-b8b3-c9644859d064/OtAutoBlock.js	86400.0 s	3.4 KiB
cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svg	86400.0 s	2.5 KiB
/logos/d4255fa8-4928-4eea-acf7-b5f7df6d256e/018de596-57ff...	86400.0 s	1.0 KiB

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

items: [map[reflowTime:27.658 source:map[type:text value:[unattributed]]] map[reflowTime:0.211 source:map[column:18257 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:0.153 source:map[column:18282 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:4.016 source:map[column:19940 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:1.086 source:map[column:20647 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:0.379 source:map[column:20678 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js urlProvider:network]] map[reflowTime:4.439 source:map[column:22446 line:0 type:source-location url:https://www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js 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
div.flexible__item > a.card > div.card__image > img `div.flexible__item > a.card > div.card__image > img`	/fit-in/720x9999999/filters:quality(70)/filters:format(we...	112.0 KiB	95.2 KiB
div.flexible__item > a.card > div.card__image > img `div.flexible__item > a.card > div.card__image > img`	/fit-in/720x9999999/filters:quality(70)/filters:format(we...	94.4 KiB	77.7 KiB
div.flexible__item > a.card > div.card__image > img `div.flexible__item > a.card > div.card__image > img`	/fit-in/720x9999999/filters:quality(70)/filters:format(we...	67.6 KiB	50.9 KiB
div.flexible-hero > div.flexible-hero__media > picture > img `div.flexible-hero > div.flexible-hero__media > picture > img`	/fit-in/1920x1080/filters:format(webp)/filters:quality(70...	225.1 KiB	41.9 KiB
main#content > div.container > div.banner > img `main#content > div.container > div.banner > img`	/filters:format(webp)/fit-in/720x9999999/prod01/channel_3...	100.0 KiB	37.8 KiB
main#content > div.container > section.landing-full-img > img `main#content > div.container > section.landing-full-img > img`	/fit-in/1440x9999999/prod01/channel_3/media/images/banner...	105.3 KiB	27.6 KiB

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.

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
www.imperial.ac.uk/assets/website/stylesheets/css/screen.2.3.5.css	84.3 KiB	275 ms
www.imperial.ac.uk/assets/website/js/lib/jquery3.min.js	30.5 KiB	275 ms
/consent/6d9efb9d-b605-406f-b8b3-c9644859d064/OtAutoBlock.js	3.4 KiB	282 ms
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	9.1 KiB	57 ms

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.imperial.ac.uk/	http/1.1
www.imperial.ac.uk/assets/website/fonts/icons/fonts/imperial-icons.woff?vrmf2d	http/1.1
www.imperial.ac.uk/assets/website/fonts/imperial-sans/ImperialText-VF.woff2	http/1.1
www.imperial.ac.uk/assets/website/stylesheets/css/screen.2.3.5.css	http/1.1
www.imperial.ac.uk/assets/website/js/lib/jquery3.min.js	http/1.1
www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js	http/1.1
www.imperial.ac.uk/assets/website/stylesheets/css/print.2.3.5.css	http/1.1
www.imperial.ac.uk/assets/website/images/svg/icons.svg#search	http/1.1
www.imperial.ac.uk/assets/website/js/require/vendor/jquery3-migrate.js	http/1.1
www.imperial.ac.uk/assets/website/images/favicon/favicon.ico	http/1.1
www.imperial.ac.uk/assets/website/images/favicon/favicon.svg	http/1.1

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

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: 0.0 ms 6.2 KiB

URL	Transfer Size	Est Savings
www.imperial.ac.uk/assets/website/js/require/vendor/jquery3-migrate.js	14.4 KiB	6.2 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: 0.0 ms 100.3 KiB

URL	Transfer Size	Est Savings
www.imperial.ac.uk/assets/website/stylesheets/css/screen.2.3.5.css	83.5 KiB	78.0 KiB
	25.1 KiB	22.3 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

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

Source: Google web.dev / Lighthouse

Estimated savings: 0.0 ms 366.7 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-LME5ZDDFS0&cx=c&gtm=4e64h1h1	171.3 KiB	68.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-NDH95W87	190.8 KiB	67.7 KiB
www.googletagmanager.com/gtag/js?id=AW-11002703160&cx=c&gtm=4e64h1h1	145.5 KiB	65.4 KiB
www.googletagmanager.com/gtag/js?id=AW-17946844669&cx=c&gtm=4e64h1h1	145.0 KiB	64.5 KiB
cdn-ukwest.onetrust.com/scripttemplates/202511.1.0/otBannerSdk.js	124.3 KiB	64.3 KiB
www.imperial.ac.uk/assets/website/js/build/application.2.3.5.min.js	51.2 KiB	36.6 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
div.content-overlap__media > div > picture.custom > img `div.content-overlap__media > div > picture.custom > img`	/fit-in/720x99999/filters:quality(70)/filters:format(webp...

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

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: 282 ms

URL	Time Spent
imperial.ac.uk/	282 ms
www.imperial.ac.uk/	0.0 ms

●Time to Interactive 2.4 s

●Max Potential First Input Delay 80 ms

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●LCP request discovery

●Optimize viewport for mobile

●Minify CSS

●Avoids enormous network payloads Total size was 2,011 KiB

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.2 s

●Minimizes main-thread work 0.6 s

●Avoid long main-thread tasks 1 long task found

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 50 ms

●Server Backend Latencies 40 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 40 ms

●Avoid large layout shifts 9 layout shifts found

○INP breakdown

Accessibility

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Blackboard `div.flow-s > ul > li > a`
Jobs `div.flow-s > ul > li > a`
Library services `div.flow-s > ul > li > a`
Outlook email online `div.flow-s > ul > li > a`
Engineering `div.flow-s > ul > li > a`
Medicine `div.flow-s > ul > li > a`
Natural Sciences `div.flow-s > ul > li > a`
Imperial Business School `div.flow-s > ul > li > a`
Admin and support services `div.flow-s > ul > li > a`
Networks and Centres `div.flow-s > ul > li > a`
Research groups `div.flow-s > ul > li > a`
Search all staff `div.flow-s > ul > li > a`
Imperial College Health Partners `div.flow-s > ul > li > a`
Imperial College Healthcare NHS Trust `div.flow-s > ul > li > a`
Imperial Consultants `div.flow-s > ul > li > a`
Sitemap `nav > ul.footer__meta > li > a`
Log in `nav > ul.footer__meta > li.hide-sm > a.t4Edit-page`

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Menu `header.header > div.header__inner > div.header__buttons > button.header__nav-open`
Cookie Policy `div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a.ot-cookie-policy-link`

○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]` 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.

●Select elements have associated label elements.

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[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

●`<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

●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.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○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

○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 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

○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.

100

Best Practices

●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

●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

●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

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

100

SEO

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○robots.txt is valid

Results for https://imperial.ac.uk

Site Health

How you compare

Top Priorities (5)

Fix Priority Matrix

Quick Wins

Strategic

Easy Improvements

Deprioritize

What fixing these means

Conversion Barriers

Speed (2)

Trust (1)

Usability (1)

Content (3)

Navigation (1)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Estimated Remediation Cost

Cost by category

Cost by effort level

What Inaction Is Costing You

Compliance Risk

Bandwidth Waste

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Best practices

Best Practices

SEO

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Best practices

Best Practices

SEO

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