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https://nationalgallery.org.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
5
REVIEW
2
PASS
6
INFO
2

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

Mobile Desktop
66
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

1.31 s

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

4.81 s

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

103 ms

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

0.006

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

3.02 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.

5.24 s

Page Load Progression

613 ms
1.2 s
1.8 s
2.5 s
3.1 s
3.7 s
4.3 s
4.9 s
Checks
15
6 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
17.2 MB transferred, 107 requests
FIX
17.2 MB transferred, 107 requests
Critical::
Page weighs 21.9 MB (17.2 MB transferred)
Warning::
Images are 8.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 8.1 MB
Warning::
JavaScript is 1.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.6 MB
Warning::
107 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.6 g CO2 per page load
17.2 MB / 2.4 MB budget
17.2 MB transferred
107 requests
3.6 g CO2 per page load
Images 8.1 MiB 47%
Other 7.2 MiB 42%
JavaScript 1.6 MiB 9%
CSS 149.0 KiB 1%
Fonts 73.6 KiB 0%
HTML 26.0 KiB 0%
Other 2.2 KiB 0%
Other 1.0 KiB 0%
Other 255 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (17.2 MiB of 17.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
15 scripts, 529 KB unused
FIX
15 scripts, 529 KB unused
Warning::
https://www.nationalgallery.org.uk/js/base.bundle....: 152 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QX7L...: 71 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-112...: 65 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-955...: 65 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-979...: 65 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 529 KB
529 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.nationalgallery.org.uk/js/base.bundle.js?v=Dp7nD6RiZXslvTCzPBEm3D0fQQg194 KB152 KB (79%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-QX7LS2HRVL&cx=c&gtm=4e64m0h2176 KB71 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-11258700076&cx=c&gtm=4e64m0h2143 KB65 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-955301225&cx=c&gtm=4e64m0h2136 KB65 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-979994843&cx=c&gtm=4e64m0h2137 KB65 KB (48%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TW25HX157 KB62 KB (40%)✓3rd
https://consent.cookiebot.com/Framework/IAB/consent-sdk-2.3.js66 KB48 KB (73%)✓3rd
https://www.nationalgallery.org.uk/js/partials.bundle.js?v=nhEE2wWm83K-TJMVyz3Yzk8BmAQ22 KB—✓3rd
https://f.vimeocdn.com/p/4.46.43/js/player.module.js212 KB—✓3rd
https://f.vimeocdn.com/p/4.46.43/js/vendor.module.js93 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

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

F
Page Weight Inventory
Action
107 resources · 17.2 MB · 529 KB savings available
FIX
107 resources · 17.2 MB · 529 KB savings available
Warning::
Page weight 16.2 MB over 1MB target
Got: 17.2 MB Expected: ≤ 1 MB
Info::
~529 KB of savings available
Warning::
106 third-party resources (100% of weight)
Info::
15 resources over 200KB
107 resources · 17.2 MiB · 106 third-party 16.2 MiB over 1MB target
Image 47% · 8.1 MiB
Media 42% · 7.2 MiB
JavaScript 9% · 1.6 MiB
CSS 1% · 149.0 KiB
Font 0% · 73.6 KiB
Document 0% · 26.4 KiB
Other 0% · 15.5 KiB

~529.0 KiB of savings available

Remove unused JavaScript: 529.0 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
57 images, 0 KB saveable
REVIEW
57 images, 0 KB saveable
Warning::
https://www.nationalgallery.org.uk/v2/img/icons/se... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nationalgallery.org.uk/v2/img/logos/ng... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nationalgallery.org.uk/media/f1ib0cwv/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nationalgallery.org.uk/v3/img/icons/gr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
57 images 8.1 MB
0 oversized -0 KB
54 legacy format
4 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

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

C
JS Execution Cost
Action
1427ms total JS execution
REVIEW
1427ms total JS execution
Warning::
https://www.nationalgallery.org.uk/: 319ms CPU time
Warning::
Unattributable: 293ms CPU time
Info::
https://consent.cookiebot.com/7b3c581a-47fb-447f-a...: 218ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-TW2...: 128ms CPU time
Info::
https://www.nationalgallery.org.uk/js/base.bundle....: 120ms CPU time
Warning::
Third-party scripts: 1427ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 28% Style & Layout 12% Script Parsing & Compilation 11% Parse HTML & CSS 7%
ScriptTotalScriptingParse/CompileParty
https://www.nationalgallery.org.uk/319ms8ms1ms3rd
Unattributable293ms4ms0ms3rd
https://consent.cookiebot.com/7b3c581a-47fb-447f-ae48-1d195d909df2/cc.js?renew=false&referer=www.nationalgallery.org.uk&dnt=false&init=false&framework=TCFv2.3218ms81ms38ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TW25HX128ms92ms29ms3rd
https://www.nationalgallery.org.uk/js/base.bundle.js?v=Dp7nD6RiZXslvTCzPBEm3D0fQQg120ms76ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-955301225&cx=c&gtm=4e64m0h287ms76ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-11258700076&cx=c&gtm=4e64m0h279ms64ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QX7LS2HRVL&cx=c&gtm=4e64m0h272ms55ms17ms3rd
https://consent.cookiebot.com/uc.js57ms50ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-979994843&cx=c&gtm=4e64m0h254ms41ms12ms3rd
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
2 fonts (74 KB)
PASS
2 fonts (74 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

74 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.3 s LCP 4.8 shttps://fonts.gstatic.com/s/cormorantgaramond/v21/co3bmX5slCNuHLi8bLeY9MK7whWMhyjYqXtKky2F7g.woff2co3bmX5slCNuHLi8bLeY9MK... https://fonts.gstatic.com/s/cormorantgaramond/v21/co3bmX5slCNuHLi8bLeY9MK7whWMhyjYqXtKky2F7g.woff2 — 36.9 KiB — 62 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 61 ms — font-display: swap
co3bmX5slCNuHLi8bLeY9MK... woff2 swap
Size 37 KB
Load time 62 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 61 ms
Start 1.1 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
107 requests over 3123ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 1.3 s LCP 4.8 shttps://nationalgallery.org.uk// https://nationalgallery.org.uk/ — 302 — 358 B — 259 ms — h2https://www.nationalgallery.org.uk/www.nationalgallery.org.uk/ https://www.nationalgallery.org.uk/ — 200 — 14.1 KiB — 328 ms — h2https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&family=Cormorant+Garamond:wght@300;400;500;700&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&family=Cormorant+Garamond:wght@300;400;500;700&display=swap — 200 — 2.4 KiB — 43 ms — h2https://www.nationalgallery.org.uk/css/base.bundle.css?v=FbvHCoIUzHVBsPoMGeAGUFy9OXUwww.nationalgallery.org.uk/css/base... https://www.nationalgallery.org.uk/css/base.bundle.css?v=FbvHCoIUzHVBsPoMGeAGUFy9OXU — 200 — 71.6 KiB — 237 ms — h2https://www.nationalgallery.org.uk/css/partials.bundle.css?v=8uGWc-oclJU5MuONOykQYGBNSKQwww.nationalgallery.org.uk/css/part... https://www.nationalgallery.org.uk/css/partials.bundle.css?v=8uGWc-oclJU5MuONOykQYGBNSKQ — 200 — 46.1 KiB — 307 ms — h2https://www.nationalgallery.org.uk/v3/css/views/home-page.css?v=0hYt9XLfBLfWGnX4SW1WGv68Q3Iwww.nationalgallery.org.uk/v3/css/v... https://www.nationalgallery.org.uk/v3/css/views/home-page.css?v=0hYt9XLfBLfWGnX4SW1WGv68Q3I — 200 — 3.8 KiB — 108 ms — h2https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 27.0 KiB — 41 ms — h2https://www.nationalgallery.org.uk/v3/img/icons/white/hamburger-menu.svgwww.nationalgallery.org.uk/v3/img/i... https://www.nationalgallery.org.uk/v3/img/icons/white/hamburger-menu.svg — 200 — 663 B — 87 ms — h2https://www.nationalgallery.org.uk/v3/img/icons/white/close.svgwww.nationalgallery.org.uk/v3/img/i... https://www.nationalgallery.org.uk/v3/img/icons/white/close.svg — 200 — 810 B — 103 ms — h2https://www.nationalgallery.org.uk/v2/img/logos/ng-logo-white-320.pngwww.nationalgallery.org.uk/v2/img/l... https://www.nationalgallery.org.uk/v2/img/logos/ng-logo-white-320.png — 200 — 7.2 KiB — 83 ms — h2https://www.nationalgallery.org.uk/v3/img/icons/white/search.svgwww.nationalgallery.org.uk/v3/img/i... https://www.nationalgallery.org.uk/v3/img/icons/white/search.svg — 200 — 973 B — 101 ms — h2https://www.nationalgallery.org.uk/v3/img/icons/white/account.svgwww.nationalgallery.org.uk/v3/img/i... https://www.nationalgallery.org.uk/v3/img/icons/white/account.svg — 200 — 803 B — 159 ms — h2https://player.vimeo.com/api/player.jsplayer.vimeo.com/api/player.js https://player.vimeo.com/api/player.js — 200 — 8.9 KiB — 29 ms — http/1.1https://www.nationalgallery.org.uk/js/base.bundle.js?v=Dp7nD6RiZXslvTCzPBEm3D0fQQgwww.nationalgallery.org.uk/js/base.... https://www.nationalgallery.org.uk/js/base.bundle.js?v=Dp7nD6RiZXslvTCzPBEm3D0fQQg — 200 — 193.8 KiB — 328 ms — h2https://consentcdn.cookiebot.com/consentconfig/7b3c581a-47fb-447f-ae48-1d195d909df2/settings.jsonconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/7b3c581a-47fb-447f-ae48-1d195d909df2/settings.json — 200 — 948 B — 43 ms — h2https://www.nationalgallery.org.uk/js/partials.bundle.js?v=nhEE2wWm83K-TJMVyz3Yzk8BmAQwww.nationalgallery.org.uk/js/parti... https://www.nationalgallery.org.uk/js/partials.bundle.js?v=nhEE2wWm83K-TJMVyz3Yzk8BmAQ — 200 — 22.1 KiB — 232 ms — h2https://www.nationalgallery.org.uk/v3/js/views/home-page.js?v=ArRyN_Oa6L-L_rZh8r9ny5QrTZ0www.nationalgallery.org.uk/v3/js/vi... https://www.nationalgallery.org.uk/v3/js/views/home-page.js?v=ArRyN_Oa6L-L_rZh8r9ny5QrTZ0 — 200 — 793 B — 149 ms — h2https://www.nationalgallery.org.uk/v2/css/umbraco-forms.css?v=hZ6S1nIk4YaYG17DLLQ3mbzc_Dswww.nationalgallery.org.uk/v2/css/u... https://www.nationalgallery.org.uk/v2/css/umbraco-forms.css?v=hZ6S1nIk4YaYG17DLLQ3mbzc_Ds — 200 — 1.2 KiB — 95 ms — h2https://www.nationalgallery.org.uk/v2/img/icons/close-thin.svgwww.nationalgallery.org.uk/v2/img/i... https://www.nationalgallery.org.uk/v2/img/icons/close-thin.svg — 200 — 409 B — 99 ms — h2https://www.nationalgallery.org.uk/v2/img/icons/search-grey.svgwww.nationalgallery.org.uk/v2/img/i... https://www.nationalgallery.org.uk/v2/img/icons/search-grey.svg — 200 — 816 B — 96 ms — h2https://www.nationalgallery.org.uk/media/f1ib0cwv/animated-banner-sprin-still-_v2.png?width=1920&height=1080&quality=85www.nationalgallery.org.uk/media/f1... https://www.nationalgallery.org.uk/media/f1ib0cwv/animated-banner-sprin-still-_v2.png?width=1920&height=1080&quality=85 — 200 — 2.6 MiB — 790 ms — h2https://www.nationalgallery.org.uk/media/tvcbd4xg/visit-carousel-must-see-paintings-1820-or-1080-high.jpg?width=768&height=768&quality=85www.nationalgallery.org.uk/media/tv... https://www.nationalgallery.org.uk/media/tvcbd4xg/visit-carousel-must-see-paintings-1820-or-1080-high.jpg?width=768&height=768&quality=85 — 200 — 123.2 KiB — 324 ms — h2https://www.nationalgallery.org.uk/media/orkld5kt/visit-carousel-eat-and-drink-1820-or-1080-high.jpg?width=768&height=768&quality=85www.nationalgallery.org.uk/media/or... https://www.nationalgallery.org.uk/media/orkld5kt/visit-carousel-eat-and-drink-1820-or-1080-high.jpg?width=768&height=768&quality=85 — 200 — 160.2 KiB — 314 ms — h2https://www.nationalgallery.org.uk/media/rj4mvasn/visit-carousel-shop-1820-or-1080-high.jpg?width=768&height=768&quality=85www.nationalgallery.org.uk/media/rj... https://www.nationalgallery.org.uk/media/rj4mvasn/visit-carousel-shop-1820-or-1080-high.jpg?width=768&height=768&quality=85 — 200 — 207.3 KiB — 397 ms — h2https://www.nationalgallery.org.uk/media/apphpp50/visit-carousel-explore-as-family-1820-or-1080-high.jpg?width=768&height=768&quality=85www.nationalgallery.org.uk/media/ap... https://www.nationalgallery.org.uk/media/apphpp50/visit-carousel-explore-as-family-1820-or-1080-high.jpg?width=768&height=768&quality=85 — 200 — 90.2 KiB — 337 ms — h2https://www.nationalgallery.org.uk/media/tvcbd4xg/visit-carousel-must-see-paintings-1820-or-1080-high.jpg?rmode=max&width=1500&height=1080&quality=85www.nationalgallery.org.uk/media/tv... https://www.nationalgallery.org.uk/media/tvcbd4xg/visit-carousel-must-see-paintings-1820-or-1080-high.jpg?rmode=max&width=1500&height=1080&quality=85 — 200 — 262.7 KiB — 545 ms — h2https://www.nationalgallery.org.uk/media/orkld5kt/visit-carousel-eat-and-drink-1820-or-1080-high.jpg?rmode=max&width=1500&height=1080&quality=85www.nationalgallery.org.uk/media/or... https://www.nationalgallery.org.uk/media/orkld5kt/visit-carousel-eat-and-drink-1820-or-1080-high.jpg?rmode=max&width=1500&height=1080&quality=85 — 200 — 309.1 KiB — 661 ms — 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h3https://www.google-analytics.com/g/collect?v=2&tid=G-QX7LS2HRVL&gtm=45je64m0h2v882441149z86410364za20gzb6410364zd6410364&_p=1776898325827&gcs=G100&gcd=13q3p3q3q5l1&npa=1&dma_cps=-&dma=0&tcfd=1265k&gdid=dMWZhNz&_eu=EA&are=1&cid=1712097772.1776898327&frm=0&ir=1&pscdl=denied&rcb=8&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266400~117512543&dl=https%3A%2F%2Fwww.nationalgallery.org.uk%2F&sid=1776898326&sct=1&seg=0&dt=The%20National%20Gallery%2C%20London&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=2533www.google-analytics.com/g/collect?... 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h3https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=48ce88ab0e45fc8ba49a0bab65ca8f896b28b5a21776898326arclight.vimeo.com/add/player-stats... https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=48ce88ab0e45fc8ba49a0bab65ca8f896b28b5a21776898326 — 200 — 11 B — 24 ms — h3https://skyfire.vimeocdn.com/1776901926-0x93f6f53c411d1ccee5e49b71f5b0b77095a0d728/2a689b69-62f4-4f6a-88b2-89b9d6ad9ee8/psid=87c6854564000e95f4c0c42ecfda9378bc6b88bb7a6c686783df5d9d248553bb/v2/range/prot/cmFuZ2U9Mjc1MjI5OS02MjE0MjUx/avf/85f539d3-4ef5-4b1c-b317-4def17ee1362.mp4?pathsig=8c953e4f~MxENgrHETI6wKzr_PzoB9FSpcNgK9IATigrK8hl6odA&r=dXMtY2VudHJhbDE%3D&range=2752299-6214251skyfire.vimeocdn.com/1776901926-0x9... https://skyfire.vimeocdn.com/1776901926-0x93f6f53c411d1ccee5e49b71f5b0b77095a0d728/2a689b69-62f4-4f6a-88b2-89b9d6ad9ee8/psid=87c6854564000e95f4c0c42ecfda9378bc6b88bb7a6c686783df5d9d248553bb/v2/range/prot/cmFuZ2U9Mjc1MjI5OS02MjE0MjUx/avf/85f539d3-4ef5-4b1c-b317-4def17ee1362.mp4?pathsig=8c953e4f~MxENgrHETI6wKzr_PzoB9FSpcNgK9IATigrK8hl6odA&r=dXMtY2VudHJhbDE%3D&range=2752299-6214251 — 200 — 3.3 MiB — 151 ms — h2https://skyfire.vimeocdn.com/1776901926-0x93f6f53c411d1ccee5e49b71f5b0b77095a0d728/2a689b69-62f4-4f6a-88b2-89b9d6ad9ee8/psid=87c6854564000e95f4c0c42ecfda9378bc6b88bb7a6c686783df5d9d248553bb/v2/range/prot/cmFuZ2U9NjIxNDI1Mi03NTU3MjYy/avf/85f539d3-4ef5-4b1c-b317-4def17ee1362.mp4?pathsig=8c953e4f~naGDrCk6urV_6iritoQ8KXfTIhWwsW9TF_3_51UkCnk&r=dXMtY2VudHJhbDE%3D&range=6214252-7557262skyfire.vimeocdn.com/1776901926-0x9... https://skyfire.vimeocdn.com/1776901926-0x93f6f53c411d1ccee5e49b71f5b0b77095a0d728/2a689b69-62f4-4f6a-88b2-89b9d6ad9ee8/psid=87c6854564000e95f4c0c42ecfda9378bc6b88bb7a6c686783df5d9d248553bb/v2/range/prot/cmFuZ2U9NjIxNDI1Mi03NTU3MjYy/avf/85f539d3-4ef5-4b1c-b317-4def17ee1362.mp4?pathsig=8c953e4f~naGDrCk6urV_6iritoQ8KXfTIhWwsW9TF_3_51UkCnk&r=dXMtY2VudHJhbDE%3D&range=6214252-7557262 — 200 — 1.3 MiB — 60 ms — h2
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 1427ms · 1279KB · £7/mo
www.nationalgallery.org.uk
Other
Costly
Execution 319ms
Transfer 14 KB
Monthly Cost £2/mo
Unattributable
Other
Costly
Execution 293ms
Transfer 0 KB
Monthly Cost £2/mo
consent.cookiebot.com
Other
Costly
Execution 218ms
Transfer 295 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 128ms
Transfer 157 KB
Unused 40%
Monthly Cost £1/mo
www.nationalgallery.org.uk
Other
Optional
Execution 120ms
Transfer 194 KB
Unused 79%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 87ms
Transfer 136 KB
Unused 48%
Monthly Cost £0/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 143 KB
Unused 46%
Monthly Cost £0/mo
Google Tag Manager
Tag Manager
Optional
Execution 72ms
Transfer 176 KB
Unused 40%
Monthly Cost £0/mo
consent.cookiebot.com
Other
Optional
Execution 57ms
Transfer 27 KB
Monthly Cost £0/mo
Google Tag Manager
Tag Manager
Optional
Execution 54ms
Transfer 137 KB
Unused 48%
Monthly Cost £0/mo

These scripts may cost more than they're worth

  • www.nationalgallery.org.uk adds 319ms and costs ~£2/month
  • Unattributable adds 293ms and costs ~£2/month
  • consent.cookiebot.com adds 218ms and costs ~£1/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.

Learn more ▾

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.nationalgallery.org.uk takes 319ms 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

Unattributable takes 293ms 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

consent.cookiebot.com takes 218ms 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

79% of www.nationalgallery.org.uk'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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