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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
74
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
4.9 MB transferred, 122 requests
FIX
4.9 MB transferred, 122 requests
Critical::
Page weighs 21.9 MB (4.9 MB transferred)
Warning::
JavaScript is 2.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.3 MB
Warning::
Images are 2.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.0 MB
Warning::
122 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.0 g CO2 per page load
4.9 MB / 2.4 MB budget
4.9 MB transferred
122 requests
1.0 g CO2 per page load
JavaScript 2.3 MiB 47%
Images 2.0 MiB 40%
HTML 346.4 KiB 7%
Fonts 142.6 KiB 3%
CSS 116.7 KiB 2%
Other 41.2 KiB 1%
Other 4.3 KiB 0%
Other 844 B 0%
Other 727 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.9 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
122 resources · 4.9 MB · 279 KB savings available
FIX
122 resources · 4.9 MB · 279 KB savings available
Warning::
Page weight 3.9 MB over 1MB target
Got: 4.9 MB Expected: ≤ 1 MB
Info::
~279 KB of savings available
Warning::
121 third-party resources (100% of weight)
Info::
6 resources over 200KB
122 resources · 4.9 MiB · 121 third-party 3.9 MiB over 1MB target
JavaScript 47% · 2.3 MiB
Image 40% · 2.0 MiB
Document 7% · 346.5 KiB
Font 3% · 142.6 KiB
CSS 2% · 121.4 KiB
Other 0% · 20.2 KiB

~279.2 KiB of savings available

Remove unused JavaScript: 279.2 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
29 images, 0 KB saveable
REVIEW
29 images, 0 KB saveable
Warning::
https://core-cms.bfi.org.uk/sites/default/files/st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://core-cms.bfi.org.uk/sites/default/files/st... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
29 images 2.0 MB
0 oversized -0 KB
25 legacy format
3 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

C
JS Execution Cost
Action
1003ms total JS execution
REVIEW
1003ms total JS execution
Warning::
https://www.bfi.org.uk/dist/client/header.3d71a25a...: 567ms CPU time
Info::
https://www.bfi.org.uk/: 136ms CPU time
Info::
Unattributable: 119ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TPS...: 72ms CPU time
Info::
https://www.bfi.org.uk/dist/client/main.35f4e4ddf8...: 57ms CPU time
Warning::
Third-party scripts: 1003ms (100% of total)

Main Thread Breakdown

Script Evaluation 67% Other 14% Style & Layout 7% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js567ms519ms9ms3rd
https://www.bfi.org.uk/136ms2ms12ms3rd
Unattributable119ms16ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQ72ms52ms14ms3rd
https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js57ms41ms11ms3rd
https://cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.js53ms34ms6ms3rd
C
JS Bundles
Action
35 scripts, 279 KB unused
REVIEW
35 scripts, 279 KB unused
Warning::
https://www.bfi.org.uk/dist/client/main.35f4e4ddf8...: 85 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bfi.org.uk/dist/client/header.3d71a25a...: 81 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TPS...: 71 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cookie-cdn.cookiepro.com/scripttemplates/6...: 43 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 279 KB
279 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js213 KB85 KB (40%)✓3rd
https://www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js173 KB81 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQ151 KB71 KB (47%)✓3rd
https://cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.js83 KB43 KB (51%)✓3rd
https://cookie-cdn.cookiepro.com/consent/bd6dd4ce-0e1b-4bd8-b05b-5376972199ca/018dadc4-b890-7f86-9252-21097973c066/en.json19 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js0 KB—✓3rd
https://www.bfi.org.uk/dist/client/221.ca8a0580ca295700de76.js5 KB—✓3rd
https://www.bfi.org.uk/dist/client/855.89bf89ff8df193b3087b.js14 KB—✓3rd
https://www.bfi.org.uk/dist/client/457.21f7c1b616af2cd49187.js5 KB—✓3rd
https://www.bfi.org.uk/dist/client/458.6fecf68cf57238bed5e0.js45 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
7 fonts (143 KB)
PASS
7 fonts (143 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

143 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 810 ms LCP 2.0 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 45 ms — font-display: swaphttps://www.bfi.org.uk/dist/client/a69ce9c0d611d0866111.woff2a69ce9c0d611d0866111.woff2 https://www.bfi.org.uk/dist/client/a69ce9c0d611d0866111.woff2 — 27.6 KiB — 3 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 77 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 51 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 39.2 KiB — 40 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 0 B — 37 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 45 ms
Start 501 ms
Risk FOUT — text flashes from fallback to web font
a69ce9c0d611d0866111.woff2 woff2 swap
Size 28 KB
Load time 3 ms
Start 574 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 77 ms
Start 734 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 51 ms
Start 767 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 39 KB
Load time 40 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 37 ms
Start 1.3 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
122 requests over 4854ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 810 ms LCP 2.0 shttps://bfi.org.uk// https://bfi.org.uk/ — 301 — 257 B — 7 ms — h2https://www.bfi.org.uk/www.bfi.org.uk/ https://www.bfi.org.uk/ — 200 — 74.9 KiB — 9 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.jscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js — 200 — 9.3 KiB — 72 ms — h2https://fonts.googleapis.com/css?family=Open+Sans:400,600,700&display=swapfonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans:400,600,700&display=swap — 200 — 2.2 KiB — 87 ms — h2https://www.bfi.org.uk/dist/client/main.91accebbcdc09556dc84.csswww.bfi.org.uk/dist/client/main.91a... https://www.bfi.org.uk/dist/client/main.91accebbcdc09556dc84.css — 200 — 733 B — 11 ms — h2https://www.bfi.org.uk/dist/client/header.91accebbcdc09556dc84.csswww.bfi.org.uk/dist/client/header.9... https://www.bfi.org.uk/dist/client/header.91accebbcdc09556dc84.css — 200 — 1.1 KiB — 4 ms — h2https://www.bfi.org.uk/dist/client/0207614d447715c2d2b9.svgwww.bfi.org.uk/dist/client/0207614d... https://www.bfi.org.uk/dist/client/0207614d447715c2d2b9.svg — 200 — 1.4 KiB — 10 ms — h2https://www.bfi.org.uk/dist/client/e51a86bb7ce82a9e9741.svgwww.bfi.org.uk/dist/client/e51a86bb... https://www.bfi.org.uk/dist/client/e51a86bb7ce82a9e9741.svg — 200 — 1.4 KiB — 3 ms — h2https://www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.jswww.bfi.org.uk/dist/client/header.3... https://www.bfi.org.uk/dist/client/header.3d71a25a335fdeada447.js — 200 — 173.4 KiB — 10 ms — h3https://core-cms.bfi.org.uk/sites/default/files/styles/responsive/public/2020-07/bfiplayer-white.png/400x0/bfiplayer-white.pngcore-cms.bfi.org.uk/sites/default/f... https://core-cms.bfi.org.uk/sites/default/files/styles/responsive/public/2020-07/bfiplayer-white.png/400x0/bfiplayer-white.png — 200 — 3.1 KiB — 83 ms — h2https://core-cms.bfi.org.uk/sites/default/files/styles/responsive/public/2023-01/sight-and-sound-logo-black-300x93.png/400x0/sight-and-sound-logo-black-300x93.pngcore-cms.bfi.org.uk/sites/default/f... https://core-cms.bfi.org.uk/sites/default/files/styles/responsive/public/2023-01/sight-and-sound-logo-black-300x93.png/400x0/sight-and-sound-logo-black-300x93.png — 200 — 6.8 KiB — 62 ms — h2https://cookie-cdn.cookiepro.com/consent/bd6dd4ce-0e1b-4bd8-b05b-5376972199ca/bd6dd4ce-0e1b-4bd8-b05b-5376972199ca.jsoncookie-cdn.cookiepro.com/consent/bd... https://cookie-cdn.cookiepro.com/consent/bd6dd4ce-0e1b-4bd8-b05b-5376972199ca/bd6dd4ce-0e1b-4bd8-b05b-5376972199ca.json — 200 — 2.5 KiB — 76 ms — h2https://hello.myfonts.net/count/3bb155hello.myfonts.net/count/3bb155 https://hello.myfonts.net/count/3bb155 — 200 — 370 B — 73 ms — h2https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.jswww.bfi.org.uk/dist/client/main.35f... https://www.bfi.org.uk/dist/client/main.35f4e4ddf81dfc0d5a66.js — 200 — 212.5 KiB — 9 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-TPS5SNQ — 200 — 150.9 KiB — 166 ms — h2https://geolocation.onetrust.com/cookieconsentpub/v1/geo/locationgeolocation.onetrust.com/cookiecons... https://geolocation.onetrust.com/cookieconsentpub/v1/geo/location — 200 — 281 B — 63 ms — h2https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2fonts.gstatic.com/s/opensans/v44/me... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 200 — 42.0 KiB — 45 ms — h3https://cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.jscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/6.34.0/otBannerSdk.js — 200 — 83.2 KiB — 50 ms — h2https://www.youtube.com/embed/2AVisfWtgTs?feature=oembed&cc_load_policy=1www.youtube.com/embed/2AVisfWtgTs?f... https://www.youtube.com/embed/2AVisfWtgTs?feature=oembed&cc_load_policy=1 — -1 — 0 B — 235 ms — https://www.youtube.com/embed/h4s11I82Ofk?feature=oembed&cc_load_policy=1www.youtube.com/embed/h4s11I82Ofk?f... https://www.youtube.com/embed/h4s11I82Ofk?feature=oembed&cc_load_policy=1 — 200 — 54.9 KiB — 234 ms — h2https://www.youtube.com/embed/SrmUFHdxxHE?feature=oembed&cc_load_policy=1www.youtube.com/embed/SrmUFHdxxHE?f... https://www.youtube.com/embed/SrmUFHdxxHE?feature=oembed&cc_load_policy=1 — 200 — 57.2 KiB — 205 ms — h2https://core-cms.bfi.org.uk/sites/default/files/styles/responsive/public/2026-03/raging-bull-1980-de-niro-in-boxing-ring-punch-homepage-crop.jpg/1920x1080/raging-bull-1980-de-niro-in-boxing-ring-punch-homepage-crop.jpgcore-cms.bfi.org.uk/sites/default/f... https://core-cms.bfi.org.uk/sites/default/files/styles/responsive/public/2026-03/raging-bull-1980-de-niro-in-boxing-ring-punch-homepage-crop.jpg/1920x1080/raging-bull-1980-de-niro-in-boxing-ring-punch-homepage-crop.jpg — 200 — 289.8 KiB — 72 ms — h2https://www.bfi.org.uk/dist/client/c3e3c55922b0e710155f.svgwww.bfi.org.uk/dist/client/c3e3c559... https://www.bfi.org.uk/dist/client/c3e3c55922b0e710155f.svg — 200 — 1.2 KiB — 13 ms — h3https://core-cms.bfi.org.uk/sites/default/files/styles/responsive/public/2020-08/bfi-southbank-riverfront-external-left-angle-view.jpg/960x540-cropped/bfi-southbank-riverfront-external-left-angle-view.jpgcore-cms.bfi.org.uk/sites/default/f... https://core-cms.bfi.org.uk/sites/default/files/styles/responsive/public/2020-08/bfi-southbank-riverfront-external-left-angle-view.jpg/960x540-cropped/bfi-southbank-riverfront-external-left-angle-view.jpg — 200 — 90.0 KiB — 72 ms — 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h2https://cookie-cdn.cookiepro.com/scripttemplates/6.34.0/assets/v2/otPcTab.jsoncookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/6.34.0/assets/v2/otPcTab.json — 200 — 12.5 KiB — 35 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/6.34.0/assets/otCommonStyles.csscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/6.34.0/assets/otCommonStyles.css — 200 — 4.7 KiB — 32 ms — h2https://www.youtube.com/embed/h4s11I82Ofk?feature=oembed&cc_load_policy=1&enablejsapi=1&origin=https%3A%2F%2Fwww.bfi.org.ukwww.youtube.com/embed/h4s11I82Ofk?f... https://www.youtube.com/embed/h4s11I82Ofk?feature=oembed&cc_load_policy=1&enablejsapi=1&origin=https%3A%2F%2Fwww.bfi.org.uk — 200 — 52.3 KiB — 128 ms — h3https://www.youtube.com/embed/SrmUFHdxxHE?feature=oembed&cc_load_policy=1&enablejsapi=1&origin=https%3A%2F%2Fwww.bfi.org.ukwww.youtube.com/embed/SrmUFHdxxHE?f... 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h2https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.KjNKUXigSn8.L.W.O/am=AAAABA/d=0/br=1/rs=AGKMywEJITLW9kQSSYb_eVLtSgu_4tU6CQwww.youtube.com/s/_/ytembeds/_/ss/k... https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.KjNKUXigSn8.L.W.O/am=AAAABA/d=0/br=1/rs=AGKMywEJITLW9kQSSYb_eVLtSgu_4tU6CQ — 200 — 0 B — 0 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=root,basewww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=root,base — 200 — 0 B — 65 ms — h3https://www.youtube.com/s/player/1bb6ee63/player_embed.vflset/en_US/base.jswww.youtube.com/s/player/1bb6ee63/p... https://www.youtube.com/s/player/1bb6ee63/player_embed.vflset/en_US/base.js — 200 — 0 B — 109 ms — 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h2https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 224 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 494 B — 31 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=r78Drb — 200 — 183.1 KiB — 44 ms — h3https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 210 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 0 B — 25 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=r78Drb — 200 — 202.7 KiB — 44 ms — h3https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 198 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 0 B — 16 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.-RE1iC8VNhI.es5.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGXhZZuMuO0YRo6SSj6JkWgSrzy9g/m=r78Drb — 200 — 0 B — 29 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 31 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 59 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 89 ms — h3https://i.ytimg.com/vi_webp/2AVisfWtgTs/sddefault.webpi.ytimg.com/vi_webp/2AVisfWtgTs/sdd... https://i.ytimg.com/vi_webp/2AVisfWtgTs/sddefault.webp — 200 — 26.1 KiB — 111 ms — h2https://i.ytimg.com/vi_webp/SrmUFHdxxHE/sddefault.webpi.ytimg.com/vi_webp/SrmUFHdxxHE/sdd... https://i.ytimg.com/vi_webp/SrmUFHdxxHE/sddefault.webp — 200 — 14.0 KiB — 86 ms — h2https://i.ytimg.com/vi/h4s11I82Ofk/sddefault.jpgi.ytimg.com/vi/h4s11I82Ofk/sddefaul... https://i.ytimg.com/vi/h4s11I82Ofk/sddefault.jpg — 200 — 37.0 KiB — 69 ms — h2https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 23.2 KiB — 62 ms — h3https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svg — 200 — 726 B — 91 ms — h2https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svg — 200 — 0 B — 92 ms — h2https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 0 B — 54 ms — h3https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 0 B — 45 ms — h3https://activity.wisepops.com/?v=2.1.136&site=vhfQzVz3qjactivity.wisepops.com/?v=2.1.136&si... https://activity.wisepops.com/?v=2.1.136&site=vhfQzVz3qj — 200 — 0 B — 162 ms — h2https://www.youtube.com/generate_204?attCYwwww.youtube.com/generate_204?attCYw https://www.youtube.com/generate_204?attCYw — 204 — 10 B — 28 ms — h3https://www.youtube.com/generate_204?WW2YCAwww.youtube.com/generate_204?WW2YCA https://www.youtube.com/generate_204?WW2YCA — 204 — 10 B — 31 ms — h3https://www.youtube.com/generate_204?fvX1Rgwww.youtube.com/generate_204?fvX1Rg https://www.youtube.com/generate_204?fvX1Rg — 204 — 10 B — 27 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 85 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 69 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 57 ms — h2https://activity.wisepops.com/?v=2.1.136&site=vhfQzVz3qjactivity.wisepops.com/?v=2.1.136&si... https://activity.wisepops.com/?v=2.1.136&site=vhfQzVz3qj — 200 — 264 B — 122 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 189 B — 37 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 35 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 189 B — 40 ms — h2https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 33 ms — h3https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 43 ms — h3https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 40 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1003ms · 695KB · £10/mo
www.bfi.org.uk
Other
Costly
Execution 567ms
Transfer 173 KB
Unused 47%
Monthly Cost £6/mo
www.bfi.org.uk
Other
Optional
Execution 136ms
Transfer 75 KB
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 119ms
Transfer 0 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 151 KB
Unused 47%
Monthly Cost £1/mo
www.bfi.org.uk
Other
Optional
Execution 57ms
Transfer 213 KB
Unused 40%
Monthly Cost £1/mo
cookie-cdn.cookiepro.com
Other
Optional
Execution 53ms
Transfer 83 KB
Unused 51%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.bfi.org.uk adds 567ms and costs ~£6/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

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Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.bfi.org.uk takes 567ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

51% of cookie-cdn.cookiepro.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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