C — https://bfi.org.uk | BeaverCheck Audit

Site Health

Score: 75 / 100

Based on 8 categories, 0 sections

Decent speed, but optimizing further could improve engagement.

Several missing protections leave your users and data exposed.

Mostly accessible, but some users still face barriers.

Well-optimized for search — your content is discoverable.

Good server performance with room for optimization.

Strong compliance posture across regulations.

Rich content metadata — your pages look great everywhere.

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

Apple · 1113 peers

You 75

Avg 73

At average

0 50 100

Better than 70% of Apple sites See full Apple benchmark →

core-js · 1337 peers

You 75

Avg 72

At average

0 50 100

Better than 77% of core-js sites See full core-js benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

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

Security › Security Headers

HSTS 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

Page weighs 21.9 MB (4.7 MB transferred)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget

1 control(s) without accessible label

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

Accessibility › Form Accessibility

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 →

Embed this badge

Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fbfi.org.uk)](https://beavercheck.com/results/fc3b4156-e84e-4be6-859c-5a014a9994e2)

HTML

<a href="https://beavercheck.com/results/fc3b4156-e84e-4be6-859c-5a014a9994e2"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fbfi.org.uk" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fbfi.org.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 9.5s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. 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.

Your LCP is 9.5s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.

1 accessibility issue excludes users who rely on assistive technology.

Could reach Estimate based on resolving critical issues

Conversion Barriers

2 critical 3 warning

5 barrier(s) likely increasing bounce by ~25%.

Speed (2)

Page takes 9.5s to load

+12% bounce

Users abandon at ~3s — you're 7.0s over the 2.5s threshold

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

Page feels frozen for 2.0s

+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 (1)

1 form field(s) without a label

+2% 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

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

Return on Investment

£375 investment → £4,735/month returns + GBP 50,000 risk avoided

Payback period: < 1 month First-year ROI: +15052%

Investment

£375

5h · 5 findings

Monthly returns

£4,735 /mo

~£56,818 / year

Conversions recovered £4,734
Bandwidth savings £0.94

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

£375

5.0 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

£4,168 / month at risk

~£50,011 / year if left unfixed

Compliance Risk

£50,000

Equality Act 2010

3 of 8 <nav> elements are unlabeled
Equality Act 2010: GBP 500 – GBP 50,000
Heading level skipped: H1 → H3 (missing H2)
Equality Act 2010: GBP 500 – GBP 50,000
1 control(s) without accessible label
Equality Act 2010: GBP 500 – GBP 50,000

Bandwidth Waste

£0.94 /mo

14870.6 MB/mo × 0.063 GBP/GB

Optimize transfer: save ~1.5 MB per page load
Saves £0.94/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 5 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

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.

9.51 s

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

1.98 s

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

0.019

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

5.31 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.

21.52 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
/sites/default/files/styles/responsive/public/2026-04/sup...	600.0 s	935.0 KiB
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js	604.0 s	212.5 KiB
www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js	604.0 s	173.4 KiB
/sites/default/files/styles/responsive/public/2026-04/pri...	600.0 s	51.3 KiB
www.bfi.org.uk/dist/client/458.6fecf68cf57238bed5e0.js	604.0 s	44.6 KiB
cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.js	86400.0 s	83.2 KiB
i.ytimg.com/vi/h4s11I82Ofk/sddefault.jpg	7200.0 s	37.0 KiB
www.bfi.org.uk/dist/client/a69ce9c0d611d0866111.woff2	604.0 s	27.6 KiB
wisepops.net/loader.js?v=1&site=vhfQzVz3qj	1800.0 s	24.2 KiB
i.ytimg.com/vi_webp/2AVisfWtgTs/sddefault.webp	7200.0 s	26.1 KiB
www.bfi.org.uk/dist/client/855.89bf89ff8df193b3087b.js	604.0 s	13.8 KiB
i.ytimg.com/vi_webp/SrmUFHdxxHE/sddefault.webp	7200.0 s	14.0 KiB
www.bfi.org.uk/dist/client/458.4df1ead7dac43992743c.css	604.0 s	8.9 KiB
www.bfi.org.uk/dist/client/221.ca8a0580ca295700de76.js	604.0 s	5.4 KiB
www.bfi.org.uk/dist/client/457.21f7c1b616af2cd49187.js	604.0 s	5.4 KiB
cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js	86400.0 s	9.3 KiB
www.bfi.org.uk/dist/client/2f4a3feb8d4022aeb7db.svg	604.0 s	2.3 KiB
www.bfi.org.uk/dist/client/f222fea05b44fdeb2e91.svg	604.0 s	1.9 KiB
www.bfi.org.uk/dist/client/e51a86bb7ce82a9e9741.svg	604.0 s	1.5 KiB
www.bfi.org.uk/dist/client/685bd3b88b8c332eaf45.svg	604.0 s	1.4 KiB
www.bfi.org.uk/dist/client/0207614d447715c2d2b9.svg	604.0 s	1.4 KiB
www.bfi.org.uk/dist/client/42a0f3f0eb04b7db1a30.svg	604.0 s	1.3 KiB
cookie-cdn.cookiepro.com/logos/static/poweredBy_cp_logo.svg	86400.0 s	2.9 KiB
www.bfi.org.uk/dist/client/c3e3c55922b0e710155f.svg	604.0 s	1.2 KiB
www.bfi.org.uk/dist/client/header.91accebbcdc09556dc84.css	604.0 s	929 B
www.bfi.org.uk/dist/client/main.91accebbcdc09556dc84.css	604.0 s	859 B
hello.myfonts.net/count/3bb155	604800.0 s	373 B
static.doubleclick.net/instream/ad_status.js	900.0 s	0 B
static.doubleclick.net/instream/ad_status.js	900.0 s	0 B
static.doubleclick.net/instream/ad_status.js	900.0 s	0 B

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
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	85 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	45 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2	40 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2	40 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-SECTION

nodeLabel: Discover the world of cinema with the BFI

path: 1,HTML,1,BODY,4,DIV,0,MAIN,0,SECTION

selector: body > div#root > main > section.Hero__Outer-sc-1keyysa-0

snippet: <section class="Hero__Outer-sc-1keyysa-0 kinZkd with_image" aria-live="polite">

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
fonts.googleapis.com/css?family=Open+Sans:400,600,700&display=swap	2.2 KiB	832 ms
hello.myfonts.net/count/3bb155	373 B	813 ms
cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js	9.3 KiB	811 ms
www.bfi.org.uk/dist/client/header.91accebbcdc09556dc84.css	929 B
www.bfi.org.uk/dist/client/main.91accebbcdc09556dc84.css	859 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6 `div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6`	/sites/default/files/styles/responsive/public/2026-04/sup...	933.7 KiB	849.3 KiB
div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6 `div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6`	/sites/default/files/styles/responsive/public/2026-04/bfi...	113.5 KiB	29.1 KiB
div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6 `div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6`	/sites/default/files/styles/responsive/public/2026-04/exi...	92.1 KiB	7.7 KiB
div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6 `div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6`	/sites/default/files/styles/responsive/public/2026-04/rom...	89.9 KiB	5.6 KiB
div.PageLinks__Outer-sc-1ef9da-0 > div.Link__Outer-sc-740r5z-0 > div.Link__PageImageContainer-sc-740r5z-6 > div.Link__PageImage-sc-740r5z-7 `div.PageLinks__Outer-sc-1ef9da-0 > div.Link__Outer-sc-740r5z-0 > div.Link__PageImageContainer-sc-740r5z-6 > div.Link__PageImage-sc-740r5z-7`	/sites/default/files/styles/responsive/public/2020-08/bfi...	89.8 KiB	5.4 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.

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: 752 ms

URL	Time Spent
bfi.org.uk/	752 ms
www.bfi.org.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

Diagnostics

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: 1.4 s 275.4 KiB

URL	Transfer Size	Est Savings
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js	210.4 KiB	82.5 KiB
www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js	172.7 KiB	79.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQ	150.5 KiB	70.8 KiB
cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.js	82.8 KiB	42.6 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.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js	2.2 s	2.1 s	47 ms
Unattributable	772 ms	115 ms	0.0 ms
www.bfi.org.uk/	490 ms	7.3 ms	27 ms
www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQ	291 ms	217 ms	36 ms
cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.js	270 ms	190 ms	34 ms
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js	261 ms	196 ms	53 ms
loader.wisepops.com/get-loader.js?v=1&site=vhfQzVz3qj	89 ms	78 ms	5.2 ms
www.bfi.org.uk/dist/client/458.6fecf68cf57238bed5e0.js	51 ms	34 ms	16 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	2.9 s
Other	806 ms
Style & Layout	272 ms
Script Parsing & Compilation	231 ms
Rendering	119 ms
Garbage Collection	99 ms
Parse HTML & CSS	74 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable

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 16.9 KiB

URL	Transfer Size	Est Savings
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} …	20.9 KiB	16.9 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/sites/default/files/styles/responsive/public/2026-04/sup...	935.0 KiB
www.youtube.com/s/player/1bb6ee63/player_embed.vflset/en_US/base.js	471.9 KiB
www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js	436.0 KiB
/sites/default/files/styles/responsive/public/2026-03/rag...	289.8 KiB
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js	212.5 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5....	202.7 KiB
www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js	173.4 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5....	156.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQ	150.9 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021...	140.1 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
Sight and Sound logo `div.slices__Slices-sc-1b0qhft-0 > div.getPromoBanner__BannerWrapper-sc-12jtskq-5 > div.getPromoBanner__PromoWrapper-sc-12jtskq-0 > img`	/sites/default/files/styles/responsive/public/2023-01/sig...
BFI Player logo `div.slices__Slices-sc-1b0qhft-0 > div.getPromoBanner__BannerWrapper-sc-12jtskq-5 > div.getPromoBanner__PromoWrapper-sc-12jtskq-0 > img`	/sites/default/files/styles/responsive/public/2020-07/bfi...
Funded by UK Government `figure.ImageSponsorLinks__Outer-sc-fogxlc-0 > div.ImageSponsorLinks__ImagesHolder-sc-fogxlc-1 > div.ImageSponsorLinks__ImageContainer-sc-fogxlc-2 > img.ImageSponsorLinks__Image-sc-fogxlc-4`
Culture Recovery Fund `figure.ImageSponsorLinks__Outer-sc-fogxlc-0 > div.ImageSponsorLinks__ImagesHolder-sc-fogxlc-1 > div.ImageSponsorLinks__ImageContainer-sc-fogxlc-2 > img.ImageSponsorLinks__Image-sc-fogxlc-4`
BFI receives National Lottery funding `figure.ImageSponsorLinks__Outer-sc-fogxlc-0 > div.ImageSponsorLinks__ImagesHolder-sc-fogxlc-1 > div.ImageSponsorLinks__ImageContainer-sc-fogxlc-2 > img.ImageSponsorLinks__Image-sc-fogxlc-4`

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

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoid long main-thread tasks 13 long tasks found

●Avoid non-composited animations 1 animated element found

●Network Requests

●Network Round Trip Times 50 ms

●Server Backend Latencies 190 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 0 ms

●Avoid large layout shifts 6 layout shifts found

○INP breakdown

○User Timing marks and measures

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.

Navigation

A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Cookies on BFI websites We use some essential cookies to make this website wor… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
What’s on at BFI Southbank `div.PageLinks__Outer-sc-1ef9da-0 > div.Link__Outer-sc-740r5z-0 > div > h3.Link__Heading-sc-740r5z-1`

These are opportunities to improve keyboard navigation in your application.

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
BFI cookies policy `div#onetrust-group-container > div#onetrust-policy > p#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.

●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

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

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

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

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

●Touch targets have sufficient size and spacing.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●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

○ARIA IDs are unique

○No form fields have multiple labels

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

○Input buttons have discernible text.

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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○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.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
Unload event listeners are deprecated and will be removed.	line 1, col 290

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
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js line 1, col 28467	`Error: Changing the iframe title is forbidden at HTMLIFrameElement.setAttribute (https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js:2:28468) at Hb (https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:215:238) at https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:225:487`
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js line 1, col 28467	`Error: Changing the iframe title is forbidden at HTMLIFrameElement.setAttribute (https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js:2:28468) at Hb (https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:215:238) at https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:225:487`
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js line 1, col 28467	`Error: Changing the iframe title is forbidden at HTMLIFrameElement.setAttribute (https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js:2:28468) at Hb (https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:215:238) at https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:225:487`

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
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js

●Uses HTTPS

●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

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Ensure proper origin isolation with COOP

○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`

○robots.txt is valid

○Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

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.

810 ms

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

1.99 s

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

336 ms

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

0.002

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

1.42 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.

4.23 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
/sites/default/files/styles/responsive/public/2026-04/sup...	600.0 s	934.9 KiB
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js	604.0 s	212.5 KiB
www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js	604.0 s	173.4 KiB
/sites/default/files/styles/responsive/public/2026-04/pri...	600.0 s	51.4 KiB
www.bfi.org.uk/dist/client/458.6fecf68cf57238bed5e0.js	604.0 s	44.6 KiB
cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.js	86400.0 s	83.2 KiB
i.ytimg.com/vi/h4s11I82Ofk/sddefault.jpg	7200.0 s	37.0 KiB
www.bfi.org.uk/dist/client/a69ce9c0d611d0866111.woff2	604.0 s	27.6 KiB
wisepops.net/loader.js?v=1&site=vhfQzVz3qj	1800.0 s	24.2 KiB
i.ytimg.com/vi_webp/2AVisfWtgTs/sddefault.webp	7200.0 s	26.1 KiB
www.bfi.org.uk/dist/client/855.89bf89ff8df193b3087b.js	604.0 s	13.8 KiB
i.ytimg.com/vi_webp/SrmUFHdxxHE/sddefault.webp	7200.0 s	14.0 KiB
www.bfi.org.uk/dist/client/458.4df1ead7dac43992743c.css	604.0 s	8.9 KiB
www.bfi.org.uk/dist/client/221.ca8a0580ca295700de76.js	604.0 s	5.4 KiB
www.bfi.org.uk/dist/client/457.21f7c1b616af2cd49187.js	604.0 s	5.4 KiB
cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js	86400.0 s	9.3 KiB
www.bfi.org.uk/dist/client/2f4a3feb8d4022aeb7db.svg	604.0 s	2.3 KiB
www.bfi.org.uk/dist/client/f222fea05b44fdeb2e91.svg	604.0 s	1.9 KiB
www.bfi.org.uk/dist/client/685bd3b88b8c332eaf45.svg	604.0 s	1.4 KiB
www.bfi.org.uk/dist/client/e51a86bb7ce82a9e9741.svg	604.0 s	1.4 KiB
www.bfi.org.uk/dist/client/0207614d447715c2d2b9.svg	604.0 s	1.4 KiB
www.bfi.org.uk/dist/client/42a0f3f0eb04b7db1a30.svg	604.0 s	1.3 KiB
cookie-cdn.cookiepro.com/logos/static/poweredBy_cp_logo.svg	86400.0 s	2.9 KiB
www.bfi.org.uk/dist/client/c3e3c55922b0e710155f.svg	604.0 s	1.2 KiB
www.bfi.org.uk/dist/client/header.91accebbcdc09556dc84.css	604.0 s	1.1 KiB
www.bfi.org.uk/dist/client/main.91accebbcdc09556dc84.css	604.0 s	733 B
static.doubleclick.net/instream/ad_status.js	900.0 s	494 B
hello.myfonts.net/count/3bb155	604800.0 s	370 B
static.doubleclick.net/instream/ad_status.js	900.0 s	0 B
static.doubleclick.net/instream/ad_status.js	900.0 s	0 B

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
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	50 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	45 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2	35 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2	35 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-SECTION

nodeLabel: Discover the world of cinema with the BFI

path: 1,HTML,1,BODY,4,DIV,0,MAIN,0,SECTION

selector: body > div#root > main > section.Hero__Outer-sc-1keyysa-0

snippet: <section class="Hero__Outer-sc-1keyysa-0 kinZkd with_image" aria-live="polite">

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
fonts.googleapis.com/css?family=Open+Sans:400,600,700&display=swap	2.2 KiB	282 ms
hello.myfonts.net/count/3bb155	370 B	265 ms
cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js	9.3 KiB	264 ms
www.bfi.org.uk/dist/client/main.91accebbcdc09556dc84.css	733 B
www.bfi.org.uk/dist/client/header.91accebbcdc09556dc84.css	1.1 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.

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.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6 `div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6`	/sites/default/files/styles/responsive/public/2026-04/sup...	933.7 KiB	849.3 KiB
div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6 `div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6`	/sites/default/files/styles/responsive/public/2026-04/bfi...	113.5 KiB	29.1 KiB
div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6 `div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6`	/sites/default/files/styles/responsive/public/2026-04/exi...	92.1 KiB	7.7 KiB
div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6 `div.ArticleGrid__Articles-sc-j2cf0b-1 > article.ArticleCard__Outer-sc-1t7vdfb-0 > div.ArticleCard__PageImageContainer-sc-1t7vdfb-5 > div.ArticleCard__PageImage-sc-1t7vdfb-6`	/sites/default/files/styles/responsive/public/2026-04/rom...	89.9 KiB	5.6 KiB
div.PageLinks__Outer-sc-1ef9da-0 > div.Link__Outer-sc-740r5z-0 > div.Link__PageImageContainer-sc-740r5z-6 > div.Link__PageImage-sc-740r5z-7 `div.PageLinks__Outer-sc-1ef9da-0 > div.Link__Outer-sc-740r5z-0 > div.Link__PageImageContainer-sc-740r5z-6 > div.Link__PageImage-sc-740r5z-7`	/sites/default/files/styles/responsive/public/2020-08/bfi...	89.8 KiB	5.4 KiB

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: 244 ms

URL	Time Spent
bfi.org.uk/	244 ms
www.bfi.org.uk/	0.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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: 340 ms 279.2 KiB

URL	Transfer Size	Est Savings
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js	210.4 KiB	84.8 KiB
www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js	172.7 KiB	80.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQ	150.5 KiB	70.8 KiB
cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.js	82.8 KiB	42.6 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 16.9 KiB

URL	Transfer Size	Est Savings
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} …	20.9 KiB	16.9 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/sites/default/files/styles/responsive/public/2026-04/sup...	934.9 KiB
www.youtube.com/s/player/1bb6ee63/player_embed.vflset/en_US/base.js	471.9 KiB
www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js	436.0 KiB
/sites/default/files/styles/responsive/public/2026-03/rag...	289.8 KiB
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js	212.5 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5....	202.7 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021...	183.1 KiB
www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js	173.4 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5....	156.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQ	150.9 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
Sight and Sound logo `div.slices__Slices-sc-1b0qhft-0 > div.getPromoBanner__BannerWrapper-sc-12jtskq-5 > div.getPromoBanner__PromoWrapper-sc-12jtskq-0 > img`	/sites/default/files/styles/responsive/public/2023-01/sig...
BFI Player logo `div.slices__Slices-sc-1b0qhft-0 > div.getPromoBanner__BannerWrapper-sc-12jtskq-5 > div.getPromoBanner__PromoWrapper-sc-12jtskq-0 > img`	/sites/default/files/styles/responsive/public/2020-07/bfi...
Funded by UK Government `figure.ImageSponsorLinks__Outer-sc-fogxlc-0 > div.ImageSponsorLinks__ImagesHolder-sc-fogxlc-1 > div.ImageSponsorLinks__ImageContainer-sc-fogxlc-2 > img.ImageSponsorLinks__Image-sc-fogxlc-4`
Culture Recovery Fund `figure.ImageSponsorLinks__Outer-sc-fogxlc-0 > div.ImageSponsorLinks__ImagesHolder-sc-fogxlc-1 > div.ImageSponsorLinks__ImageContainer-sc-fogxlc-2 > img.ImageSponsorLinks__Image-sc-fogxlc-4`
BFI receives National Lottery funding `figure.ImageSponsorLinks__Outer-sc-fogxlc-0 > div.ImageSponsorLinks__ImagesHolder-sc-fogxlc-1 > div.ImageSponsorLinks__ImageContainer-sc-fogxlc-2 > img.ImageSponsorLinks__Image-sc-fogxlc-4`

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

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●JavaScript execution time 0.7 s

●Minimizes main-thread work 1.1 s

●Avoid long main-thread tasks 3 long tasks found

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 40 ms

●Server Backend Latencies 120 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 0 ms

●Avoid large layout shifts 9 layout shifts found

○INP breakdown

○User Timing marks and measures

Accessibility

Navigation

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Cookies on BFI websites We use some essential cookies to make this website wor… `body > div#onetrust-consent-sdk > div#onetrust-banner-sdk`

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
What’s on at BFI Southbank `div.PageLinks__Outer-sc-1ef9da-0 > div.Link__Outer-sc-740r5z-0 > div > h3.Link__Heading-sc-740r5z-1`

These are opportunities to improve keyboard navigation in your application.

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
BFI cookies policy `div#onetrust-group-container > div#onetrust-policy > p#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.

●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

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

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

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

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

●Touch targets have sufficient size and spacing.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●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

○ARIA IDs are unique

○No form fields have multiple labels

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

○Input buttons have discernible text.

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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○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.

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
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js line 1, col 28467	`Error: Changing the iframe title is forbidden at HTMLIFrameElement.setAttribute (https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js:2:28468) at Hb (https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:215:238) at https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:225:487`
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js line 1, col 28467	`Error: Changing the iframe title is forbidden at HTMLIFrameElement.setAttribute (https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js:2:28468) at Hb (https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:215:238) at https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:225:487`
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js line 1, col 28467	`Error: Changing the iframe title is forbidden at HTMLIFrameElement.setAttribute (https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js:2:28468) at Hb (https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:215:238) at https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js:225:487`

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.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

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Ensure proper origin isolation with COOP

○Mitigate clickjacking with XFO or CSP

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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`

○robots.txt is valid

○Document has a valid `rel=canonical`

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