C — https://tfl.gov.uk | BeaverCheck Audit

Site Health

Score: 76 / 100

Based on 8 categories, 0 sections

Decent speed, but optimizing further could improve engagement.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Well-optimized for search — your content is discoverable.

Solid infrastructure — fast server responses across the board.

Strong compliance posture across regulations.

Good content signals with minor gaps.

Lean and efficient — low environmental impact per visit.

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

Apple · 822 peers

You 76

Avg 73

At average

0 50 100

Better than 78% of Apple sites See full Apple benchmark →

Cookie Control · 52 peers

You 76

Avg 74

At average

0 50 100

Better than 57% of Cookie Control sites See full Cookie Control benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

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

Security › Security Headers

No Content-Security-Policy header found

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

Security › Content Security Policy

3 link(s) with no accessible text

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

Accessibility › Link & Button Quality

9 control(s) without accessible label

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

Accessibility › Form Accessibility

Cross-Origin-Embedder-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%2Ftfl.gov.uk)](https://beavercheck.com/results/c05d660b-8f78-485c-bc6b-2318d0237699)

HTML

<a href="https://beavercheck.com/results/c05d660b-8f78-485c-bc6b-2318d0237699"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Ftfl.gov.uk" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Ftfl.gov.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. Addressing the critical issues below would have the most immediate impact on your user trust.

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

2 accessibility issues exclude users who rely on assistive technology.

Conversion Barriers

4 critical 6 warning

10 barrier(s) likely increasing bounce by ~36%.

Speed (2)

Page takes 14.3s to load

+12% bounce

Users abandon at ~3s — you're 11.8s over the 2.5s threshold

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

Page feels frozen for 1.7s

+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 (2)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

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 (2)

Layout shifts during page load

+3% bounce

Content movement causes mis-clicks on CTAs and form fields

Fix: Add width/height to images; reserve space for late-loading embeds

9 form field(s) without a label

+6% bounce

Screen readers skip unlabeled fields; autofill can't identify them; checkout abandonment spikes

Fix: Associate every input with a visible <label for="…">; add autocomplete attributes

Content (2)

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, …)

Content is hard to read

+2% bounce

Graduate-level reading difficulty — limits the addressable audience for product or blog pages

Fix: Shorten sentences; replace jargon with plain language; target Flesch ease ≥60

Navigation (2)

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

5 broken link(s) on the page

+5% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

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

Return on Investment

£338 investment → £493/month returns + GBP 50,000 risk avoided

Payback period: < 1 month First-year ROI: +1654%

Investment

£338

4h · 5 findings

Monthly returns

£493 /mo

~£5,920 / year

Conversions recovered £493
Bandwidth savings £0.40

Regulatory risk avoided

GBP 50,000

if kept compliant

Equality Act 2010 GBP 50,000

Payback period

0 12mo 24mo

£113 — 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

£338

4.5 developer hours at £75/hr

Based on United Kingdom rates (£75/hr)

Quick wins

£113 3 fixes in ~90 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

£4,167 / month at risk

~£50,005 / year if left unfixed

Compliance Risk

£50,000

Equality Act 2010

Skip navigation link is missing (WCAG 2.4.1)
Equality Act 2010: GBP 500 – GBP 50,000
9 control(s) without accessible label
Equality Act 2010: GBP 500 – GBP 50,000

Bandwidth Waste

£0.40 /mo

6298.4 MB/mo × 0.063 GBP/GB

Optimize transfer: save ~630 KB per page load
Saves £0.40/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 4 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

Best Practices

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.

2.31 s

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

14.32 s

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

1.67 s

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

0.102

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

5.33 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.

14.41 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
consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js	286.0 s	87.9 KiB
consent.cookiebot.com/uc.js	147.0 s	35.7 KiB
assets.adobedtm.com/launch-ENc5e3f827edc94f2a816110524598acd7.min.js	3600.0 s	38.4 KiB
/1b4372ea8265/bb7b18fe4f35/1e0857d9b31e/RCa57525099acf4af...	3600.0 s	946 B
/1b4372ea8265/bb7b18fe4f35/1e0857d9b31e/RCc5b426f051a848c...	3600.0 s	746 B
push-api-ganges.tfl.gov.uk/signalr/hubs	604800.0 s	1.5 KiB

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.102066] map[node:map[boundingRect:map[bottom:3667 height:3525 left:0 right:412 top:142 width:412] lhId:page-5-MAIN nodeLabel:Tube drivers' strike Services disrupted between Tuesday 21 and Friday 24 April.… path:6,HTML,2,BODY,6,DIV,2,MAIN selector:body.personalisation-active > div#container > main#full-width-content snippet:<main id="full-width-content"> type:node] score:0.102066]]

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
tfl.gov.uk/cdn/static/assets/fonts/Johnston100-Regular.woff2	45 ms
tfl.gov.uk/cdn/static/assets/fonts/Johnston100-Medium.woff2	40 ms
tfl.gov.uk/cdn/static/assets/fonts/Johnston100-Light.woff2	35 ms
tfl.gov.uk/static/1/assets/fonts/njfontsigning-medium.woff	35 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:1.717 source:map[column:51 line:38 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/core/min/init.min.347d0889.js 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:0.33 source:map[column:37897 line:2 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:3.974 source:map[type:text value:[unattributed]]] map[reflowTime:0.453 source:map[column:31275 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.124 source:map[column:31434 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.093 source:map[column:31765 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.111 source:map[column:31836 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.364 source:map[column:32115 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.159 source:map[column:32204 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:6.384 source:map[column:36696 line:10 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:4.1 source:map[column:27 line:2156 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js urlProvider:network]] map[reflowTime:11.024 source:map[column:29205 line:10 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:1.045 source:map[column:43 line:11814 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js urlProvider:network]] map[reflowTime:0.293 source:map[column:4409 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:6.524 source:map[column:32517 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:3.535 source:map[column:35106 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:2.027 source:map[column:32541 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.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
a.broadcast-comms > div.r > div.broadcast-text > ::after `a.broadcast-comms > div.r > div.broadcast-text > ::after`	tfl.gov.uk/static/1/images/vsprite.17114d90.png	105.6 KiB	46.6 KiB
`div.r > div.logo > a > span.main-roundel`	tfl.gov.uk/static/1/images/vsprite_x2.34614087.png	248.9 KiB	12.9 KiB
IFS Cloud logo `div.main-services > div.clearfix > a.flat-button > span.services-icon`	tfl.gov.uk/static/1/images/homepage_sprite_x2.png	24.6 KiB	9.6 KiB
div.sub-main > div.primary-teaser > div.news-teaser > img `div.sub-main > div.primary-teaser > div.news-teaser > img`	tfl.gov.uk/cdn/static/cms/images/promos/tfl-go-hp_rdax_400x200.png	20.4 KiB	7.4 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

value: no origins were preconnected

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
tfl.gov.uk/cdn/static/styles/core/min/specifics-small.min.252ae3e0.css	85.2 KiB	332 ms
tfl.gov.uk/cdn/static/styles/core/min/modules.min.a75e2042.css	82.9 KiB	498 ms
tfl.gov.uk/cdn/static/styles/core/min/small.min.1d5963c4.css	91.5 KiB	498 ms

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

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.

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
Tube drivers' strike Services disrupted between Tuesday 21 and Friday 24 April.… `body.personalisation-active > div#container > main#full-width-content`	0.102

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying 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: 170 ms 55.8 KiB

URL	Transfer Size	Est Savings
tfl.gov.uk/cdn/static/styles/core/min/modules.min.a75e2042.css	82.9 KiB	18.1 KiB
tfl.gov.uk/cdn/static/styles/core/min/specifics-small.min.252ae3e0.css	85.2 KiB	15.3 KiB
tfl.gov.uk/cdn/static/styles/core/min/small.min.1d5963c4.css	91.5 KiB	14.7 KiB
tfl.gov.uk/cdn/static/styles/core/min/medium.min.cc9ff121.css	20.1 KiB	4.8 KiB
tfl.gov.uk/cdn/static/styles/core/min/large.min.c085d741.css	12.3 KiB	2.9 KiB

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: 660 ms 127.4 KiB

URL	Transfer Size	Est Savings
tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js	312.5 KiB	110.9 KiB
tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js	46.3 KiB	8.3 KiB
tfl.gov.uk/cdn/static/scripts/core/min/init.min.347d0889.js	10.5 KiB	4.2 KiB
/cdn/static/scripts/specific/stations-stops-piers/predict...	12.3 KiB	4.0 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.3 s 276.9 KiB

URL	Transfer Size	Est Savings
tfl.gov.uk/cdn/static/styles/core/min/small.min.1d5963c4.css	91.3 KiB	86.1 KiB
tfl.gov.uk/cdn/static/styles/core/min/specifics-small.min.252ae3e0.css	85.1 KiB	84.0 KiB
tfl.gov.uk/cdn/static/styles/core/min/modules.min.a75e2042.css	82.7 KiB	74.5 KiB
tfl.gov.uk/cdn/static/styles/core/min/medium.min.cc9ff121.css	20.0 KiB	20.0 KiB
tfl.gov.uk/cdn/static/styles/core/min/large.min.c085d741.css	12.2 KiB	12.2 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: 2.3 s 460.5 KiB

URL	Transfer Size	Est Savings
tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js	312.5 KiB	244.3 KiB
/_/translate_http/_/js/k=translate_http.tr.es.eNjH1Jo6ldQ...	118.2 KiB	108.7 KiB
consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js	87.7 KiB	64.3 KiB
consent.cookiebot.com/uc.js	35.4 KiB	22.4 KiB
/e601acc6-2e6f-4bed-a826-046477b39b61/cc.js?renew=false&r...	299.9 KiB	20.9 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
consent.cookiebot.com/uc.js	4.4 s	1.6 s	11 ms
tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js	738 ms	376 ms	142 ms
tfl.gov.uk/	482 ms	16 ms	9.4 ms
Unattributable	205 ms	4.9 ms	0.0 ms
/e601acc6-2e6f-4bed-a826-046477b39b61/cc.js?renew=false&r...	146 ms	23 ms	122 ms
assets.adobedtm.com/launch-ENc5e3f827edc94f2a816110524598acd7.min.js	136 ms	70 ms	19 ms
tfl.gov.uk/cdn/static/scripts/core/min/init.min.347d0889.js	125 ms	96 ms	3.0 ms
tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js	64 ms	39 ms	9.5 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
Parse HTML & CSS	2.9 s
Script Evaluation	2.3 s
Style & Layout	509 ms
Other	420 ms
Script Parsing & Compilation	410 ms
Rendering	94 ms
Garbage Collection	28 ms

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.sub-main > div.primary-teaser > div.news-teaser > img `div.sub-main > div.primary-teaser > div.news-teaser > img`	tfl.gov.uk/cdn/static/cms/images/promos/tfl-go-hp_rdax_400x200.png
Mayor of London `div.footer-MOL-logo > div.for-dropdown > button#mol-button > img`	tfl.gov.uk/static/cms/images/MoL.png

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

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Avoids enormous network payloads Total size was 2,050 KiB

●Avoid long main-thread tasks 6 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 40 ms

●Server Backend Latencies 150 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 60 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○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.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
`div.top-row > div.r > div.logo > a`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

○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

●`[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

●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.

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

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

●Touch targets have sufficient size and spacing.

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

●Elements with visible text labels have matching accessible names.

○`[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

○ARIA IDs are unique

○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

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○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

General

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
/_/translate_http/_/js/k=translate_http.tr.es.eNjH1Jo6ldQ... line 4, col 8	`Uncaught TypeError: Cannot assign to read only property 'forEach' of object '#<qi>'`

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
tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js

●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 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

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
tfl.gov.uk/corporate/privacy-and-cookies/cookies	here

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

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
Search `div.top-row-extras > div.texts > div.search > a.show-mobile-search`
Clear Search the site `form > div.search-tools > div.remove-content-container > a.remove-content`
Now you can save your favourites Take a look `div#favourite-menu > button#c-button-slide-right > span.onboard-modal-popup > a.onboard-open-fav-panel`
Clear From location `div#search-filter-form-0 > div.geolocation-box > div.remove-content-container > a.remove-content`
Clear To location `div.from-and-to > div#search-filter-form-1 > div.remove-content-container > a.remove-content`
change time `fieldset > div.time-options > div.time-defaults > a.change-departure-time`
Clear Travel via `div.go-via > div#search-filter-form-2 > div.remove-content-container > a.remove-content`
Clear Search for Bus route or stop name `form#search-filter-form-fav-home > div.text-input > div.remove-content-container > a.remove-content`
Clear Search for stations, stops and piers (e.g. Bank) `form#search-filter-form > div.text-input > div.remove-content-container > a.remove-content`
No exceptional delays on all road corridor… `tbody.board-good-service > tr.collapsed-lines > td.service-status > a.disruption-info-link`
Edit my lines `div#fav-status-tube-dlr-overground-elizabeth-line-tram > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my buses `div#fav-status-bus > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my roads `div#fav-status-traffic > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my river buses `div#fav-status-river-bus > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my IFS Cloud Cable Car `div#fav-status-cable-car > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my journeys `div#fav-status-journey > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my places `div#fav-status-place > div > div.fav-forward-to > a.fav-forward-to-edit`
Lines `div.fav-panel-details > div#fav-add-favourites > div#add-tube-dlr-overground-elizabeth-line-tram > a.fav-open-edit`
Buses `div.fav-panel-details > div#fav-add-favourites > div#add-bus > a.fav-open-edit`
Roads `div.fav-panel-details > div#fav-add-favourites > div#add-traffic > a.fav-open-edit`
River Buses `div.fav-panel-details > div#fav-add-favourites > div#add-river-bus > a.fav-open-edit`
IFS Cloud Cable Car `div.fav-panel-details > div#fav-add-favourites > div#add-cable-car > a.fav-open-edit`
Places Choose postcodes, stations and places for quick journey planning `div.fav-panel-details > div#fav-add-favourites > div#add-place > a.fav-open-edit`
Clear Search `form#search-filter-form-fav > div.text-input > div.remove-content-container > a.remove-content`
Clear Edit label `li.fav-rainbow-list-item > div.fav-rainbow-list-link > div.remove-content-container > a.remove-content`
Add a Label `div#fav-edit-place > div.edit-place-view > div.edit-place-labels > a.secondary-button`
Clear Add a label `div > div#fav-label-search-filter > div.remove-content-container > a.remove-content`
Clear Search `form#search-filter-form-fav-place > div.text-input > div.remove-content-container > a.remove-content`
View `div.popup > div.fav-toast-notification > span.right-float > a#view-favourites-updated`

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Line #	Content	Error
6	`Sitemap: /sitemap.xml`	`Invalid sitemap URL`

To appear in search results, crawlers need access to your app.

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

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.

574 ms

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

3.11 s

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

478 ms

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

0.012

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

1.92 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.

3.17 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
consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js	260.0 s	87.9 KiB
consent.cookiebot.com/uc.js	121.0 s	35.7 KiB
assets.adobedtm.com/launch-ENc5e3f827edc94f2a816110524598acd7.min.js	3600.0 s	38.4 KiB
/1b4372ea8265/bb7b18fe4f35/1e0857d9b31e/RCa57525099acf4af...	3600.0 s	946 B
/1b4372ea8265/bb7b18fe4f35/1e0857d9b31e/RCc5b426f051a848c...	3600.0 s	746 B
push-api-ganges.tfl.gov.uk/signalr/hubs	604800.0 s	1.5 KiB

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
tfl.gov.uk/cdn/static/assets/fonts/Johnston100-Regular.woff2	45 ms
tfl.gov.uk/cdn/static/assets/fonts/Johnston100-Light.woff2	35 ms
tfl.gov.uk/static/1/assets/fonts/njfontsigning-medium.woff	30 ms
tfl.gov.uk/cdn/static/assets/fonts/Johnston100-Medium.woff2	25 ms

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:3.97 source:map[column:51 line:38 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/core/min/init.min.347d0889.js 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:38.37 source:map[type:text value:[unattributed]]] map[reflowTime:0.989 source:map[column:37897 line:2 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.554 source:map[column:31275 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.21 source:map[column:31434 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.09 source:map[column:31765 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.131 source:map[column:31836 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.35 source:map[column:32115 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:0.172 source:map[column:32204 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:6.981 source:map[column:36696 line:10 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:11.791 source:map[column:29205 line:10 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:1.584 source:map[column:43 line:11814 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js urlProvider:network]] map[reflowTime:0.302 source:map[column:4409 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:8.006 source:map[column:32517 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:5.492 source:map[column:35106 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js urlProvider:network]] map[reflowTime:3.313 source:map[column:32541 line:6 type:source-location url:https://tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.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
woman wearing a bag from the second pom pom tfl collection `div.sub-main > div.secondary-teaser > div.news-teaser > img`	/cdn/static/cms/images/promos/pom-pom-london-tfl-collecti...	93.4 KiB	83.9 KiB
div.large > div.moving-source-order > div.news-teaser > img `div.large > div.moving-source-order > div.news-teaser > img`	tfl.gov.uk/cdn/static/cms/images/promos/bank-closure-700x350_rdax_400x200s.jpg	36.4 KiB	27.0 KiB
`div.r > div.logo > a > span.main-roundel`	tfl.gov.uk/static/1/images/vsprite_x2.34614087.png	248.9 KiB	12.9 KiB
IFS Cloud logo `div.main-services > div.clearfix > a.flat-button > span.services-icon`	tfl.gov.uk/static/1/images/homepage_sprite_x2.png	24.6 KiB	9.6 KiB

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-4-DIV

nodeLabel: Plan a journey New Journey My Journeys Recents Journey preferences From locatio…

path: 6,HTML,2,BODY,6,DIV,2,MAIN,4,DIV

selector: body.personalisation-active > div#container > main#full-width-content > div#main-hero

snippet: <div class="hero-container" id="main-hero" style="background-image: url(/cdn/static/cms/images/promos/tfl-go-hp.png)">

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

value: no origins were preconnected

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
tfl.gov.uk/cdn/static/styles/core/min/medium.min.cc9ff121.css	20.1 KiB
tfl.gov.uk/cdn/static/styles/core/min/specifics-small.min.252ae3e0.css	85.3 KiB	106 ms
tfl.gov.uk/cdn/static/styles/core/min/small.min.1d5963c4.css	91.4 KiB	106 ms
tfl.gov.uk/cdn/static/styles/core/min/modules.min.a75e2042.css	82.8 KiB	53 ms
tfl.gov.uk/cdn/static/styles/core/min/large.min.c085d741.css	12.4 KiB

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

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.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying 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: 110 ms 55.8 KiB

URL	Transfer Size	Est Savings
tfl.gov.uk/cdn/static/styles/core/min/modules.min.a75e2042.css	82.8 KiB	18.1 KiB
tfl.gov.uk/cdn/static/styles/core/min/specifics-small.min.252ae3e0.css	85.3 KiB	15.3 KiB
tfl.gov.uk/cdn/static/styles/core/min/small.min.1d5963c4.css	91.4 KiB	14.7 KiB
tfl.gov.uk/cdn/static/styles/core/min/medium.min.cc9ff121.css	20.1 KiB	4.8 KiB
tfl.gov.uk/cdn/static/styles/core/min/large.min.c085d741.css	12.4 KiB	2.9 KiB

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: 110 ms 127.4 KiB

URL	Transfer Size	Est Savings
tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js	312.5 KiB	110.9 KiB
tfl.gov.uk/cdn/static/scripts/jquery/1.12.4/jquery.min.js	46.3 KiB	8.3 KiB
tfl.gov.uk/cdn/static/scripts/core/min/init.min.347d0889.js	10.5 KiB	4.2 KiB
/cdn/static/scripts/specific/stations-stops-piers/predict...	12.3 KiB	4.0 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 260 ms 274.5 KiB

URL	Transfer Size	Est Savings
tfl.gov.uk/cdn/static/styles/core/min/small.min.1d5963c4.css	91.3 KiB	86.1 KiB
tfl.gov.uk/cdn/static/styles/core/min/specifics-small.min.252ae3e0.css	85.1 KiB	84.3 KiB
tfl.gov.uk/cdn/static/styles/core/min/modules.min.a75e2042.css	82.7 KiB	74.1 KiB
tfl.gov.uk/cdn/static/styles/core/min/medium.min.cc9ff121.css	20.0 KiB	18.4 KiB
tfl.gov.uk/cdn/static/styles/core/min/large.min.c085d741.css	12.2 KiB	11.6 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: 480 ms 460.1 KiB

URL	Transfer Size	Est Savings
tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js	312.5 KiB	243.9 KiB
/_/translate_http/_/js/k=translate_http.tr.es.eNjH1Jo6ldQ...	118.2 KiB	108.7 KiB
consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js	87.7 KiB	64.3 KiB
consent.cookiebot.com/uc.js	35.5 KiB	22.4 KiB
/e601acc6-2e6f-4bed-a826-046477b39b61/cc.js?renew=false&r...	299.8 KiB	20.9 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
woman wearing a bag from the second pom pom tfl collection `div.sub-main > div.secondary-teaser > div.news-teaser > img`	/cdn/static/cms/images/promos/pom-pom-london-tfl-collecti...
div.large > div.moving-source-order > div.news-teaser > img `div.large > div.moving-source-order > div.news-teaser > img`	tfl.gov.uk/cdn/static/cms/images/promos/bank-closure-700x350_rdax_400x200s.jpg
Mayor of London `div.footer-MOL-logo > div.for-dropdown > button#mol-button > img`	tfl.gov.uk/static/cms/images/MoL.png

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Avoids enormous network payloads Total size was 2,027 KiB

●JavaScript execution time 0.5 s

●Minimizes main-thread work 1.8 s

●Avoid long main-thread tasks 2 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 40 ms

●Server Backend Latencies 170 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

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

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

Accessibility

ARIA

Some ARIA roles have required attributes that describe the state of the element to screen readers. Learn more about roles and required attributes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.geolocation-box > div.remove-content-container > span.twitter-typeahead > input#InputFrom `div.geolocation-box > div.remove-content-container > span.twitter-typeahead > input#InputFrom`
div#search-filter-form-1 > div.remove-content-container > span.twitter-typeahead > input#InputTo `div#search-filter-form-1 > div.remove-content-container > span.twitter-typeahead > input#InputTo`

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.

○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>`

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Input buttons have discernible text.

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

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

●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

●Touch targets have sufficient size and spacing.

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

●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 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

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

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

○`<input type="image">` elements have `[alt]` text

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○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

General

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
/_/translate_http/_/js/k=translate_http.tr.es.eNjH1Jo6ldQ... line 4, col 8	`Uncaught TypeError: Cannot assign to read only property 'forEach' of object '#<qi>'`

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
tfl.gov.uk/cdn/static/scripts/core/min/global.min.846723f5.js

●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 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

SEO

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
tfl.gov.uk/corporate/privacy-and-cookies/cookies	here

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

Crawling and Indexing

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow `div.cb-iab-choice > div.CybotCookiebotDialogBodyLevelButtonIABWrapper > div.CybotCookiebotDialogBodyLevelButtonIABContainer > a.cb-toggleShow`
Search `div.top-row-extras > div.texts > div.search > a.show-mobile-search`
Clear Search the site `form > div.search-tools > div.remove-content-container > a.remove-content`
Now you can save your favourites Take a look `div#favourite-menu > button#c-button-slide-right > span.onboard-modal-popup > a.onboard-open-fav-panel`
Clear From location `div#search-filter-form-0 > div.geolocation-box > div.remove-content-container > a.remove-content`
Clear To location `div.from-and-to > div#search-filter-form-1 > div.remove-content-container > a.remove-content`
change time `fieldset > div.time-options > div.time-defaults > a.change-departure-time`
Clear Travel via `div.go-via > div#search-filter-form-2 > div.remove-content-container > a.remove-content`
Clear Search for Bus route or stop name `form#search-filter-form-fav-home > div.text-input > div.remove-content-container > a.remove-content`
Clear Search for stations, stops and piers (e.g. Bank) `form#search-filter-form > div.text-input > div.remove-content-container > a.remove-content`
No exceptional delays on all road corridor… `tbody.board-good-service > tr.collapsed-lines > td.service-status > a.disruption-info-link`
Edit my lines `div#fav-status-tube-dlr-overground-elizabeth-line-tram > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my buses `div#fav-status-bus > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my roads `div#fav-status-traffic > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my river buses `div#fav-status-river-bus > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my IFS Cloud Cable Car `div#fav-status-cable-car > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my journeys `div#fav-status-journey > div > div.fav-forward-to > a.fav-forward-to-edit`
Edit my places `div#fav-status-place > div > div.fav-forward-to > a.fav-forward-to-edit`
Lines `div.fav-panel-details > div#fav-add-favourites > div#add-tube-dlr-overground-elizabeth-line-tram > a.fav-open-edit`
Buses `div.fav-panel-details > div#fav-add-favourites > div#add-bus > a.fav-open-edit`
Roads `div.fav-panel-details > div#fav-add-favourites > div#add-traffic > a.fav-open-edit`
River Buses `div.fav-panel-details > div#fav-add-favourites > div#add-river-bus > a.fav-open-edit`
IFS Cloud Cable Car `div.fav-panel-details > div#fav-add-favourites > div#add-cable-car > a.fav-open-edit`
Places Choose postcodes, stations and places for quick journey planning `div.fav-panel-details > div#fav-add-favourites > div#add-place > a.fav-open-edit`
Clear Search `form#search-filter-form-fav > div.text-input > div.remove-content-container > a.remove-content`
Clear Edit label `li.fav-rainbow-list-item > div.fav-rainbow-list-link > div.remove-content-container > a.remove-content`
Add a Label `div#fav-edit-place > div.edit-place-view > div.edit-place-labels > a.secondary-button`
Clear Add a label `div > div#fav-label-search-filter > div.remove-content-container > a.remove-content`
Clear Search `form#search-filter-form-fav-place > div.text-input > div.remove-content-container > a.remove-content`
View `div.popup > div.fav-toast-notification > span.right-float > a#view-favourites-updated`

If your robots.txt file is malformed, crawlers may not be able to understand how you want your website to be crawled or indexed. Learn more about robots.txt.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Line #	Content	Error
6	`Sitemap: /sitemap.xml`	`Invalid sitemap URL`

To appear in search results, crawlers need access to your app.

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Results for https://tfl.gov.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 (2)

Usability (2)

Content (2)

Navigation (2)

Return on Investment

Investment

Monthly returns

Regulatory risk avoided

Payback period

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

Names and labels

Best Practices

General

SEO

Content Best Practices

Crawling and Indexing

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

ARIA

Best Practices

General

SEO

Content Best Practices

Crawling and Indexing

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