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https://nationalgallery.org.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
35
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.

3.36 s

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

11.42 s

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

1.21 s

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

0.090

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

7.65 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.

16.77 s

Page Load Progression

632 ms
1.3 s
1.9 s
2.5 s
3.2 s
3.8 s
4.4 s
5.1 s
Checks
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
10.5 MB transferred, 111 requests
FIX
10.5 MB transferred, 111 requests
Critical::
Page weighs 15.2 MB (10.5 MB transferred)
Warning::
Images are 5.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 5.4 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::
111 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.2 g CO2 per page load
10.5 MB / 2.4 MB budget
10.5 MB transferred
111 requests
2.2 g CO2 per page load
Images 5.4 MiB 51%
Other 3.3 MiB 31%
JavaScript 1.6 MiB 15%
CSS 149.0 KiB 1%
Fonts 73.6 KiB 1%
HTML 26.1 KiB 0%
Other 1.1 KiB 0%
Other 1.1 KiB 0%
Other 236 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 (10.5 MiB of 10.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5387ms total JS execution
FIX
5387ms total JS execution
Warning::
https://www.nationalgallery.org.uk/: 1049ms CPU time
Warning::
https://consent.cookiebot.com/7b3c581a-47fb-447f-a...: 1029ms CPU time
Warning::
Unattributable: 806ms CPU time
Warning::
https://www.nationalgallery.org.uk/js/base.bundle....: 572ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TW2...: 441ms CPU time
Warning::
Third-party scripts: 5387ms (100% of total)

Main Thread Breakdown

Script Evaluation 43% Other 22% Style & Layout 12% Script Parsing & Compilation 11% Parse HTML & CSS 8% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.nationalgallery.org.uk/1049ms34ms4ms3rd
https://consent.cookiebot.com/7b3c581a-47fb-447f-ae48-1d195d909df2/cc.js?renew=false&referer=www.nationalgallery.org.uk&dnt=false&init=false&framework=TCFv2.31029ms430ms175ms3rd
Unattributable806ms16ms0ms3rd
https://www.nationalgallery.org.uk/js/base.bundle.js?v=Dp7nD6RiZXslvTCzPBEm3D0fQQg572ms360ms72ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TW25HX441ms340ms64ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-955301225&cx=c&gtm=4e64k1327ms277ms46ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QX7LS2HRVL&cx=c&gtm=4e64k1269ms200ms66ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-11258700076&cx=c&gtm=4e64k1261ms210ms49ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-979994843&cx=c&gtm=4e64k1224ms176ms46ms3rd
https://consent.cookiebot.com/uc.js208ms164ms14ms3rd

Showing top 10 of 12 scripts

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...: 66 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...: 64 KB unused (47%)
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=4e64k1177 KB71 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-11258700076&cx=c&gtm=4e64k1143 KB66 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-955301225&cx=c&gtm=4e64k1137 KB65 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-979994843&cx=c&gtm=4e64k1137 KB64 KB (47%)✓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.js211 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
111 resources · 10.5 MB · 529 KB savings available
FIX
111 resources · 10.5 MB · 529 KB savings available
Warning::
Page weight 9.5 MB over 1MB target
Got: 10.5 MB Expected: ≤ 1 MB
Info::
~529 KB of savings available
Warning::
110 third-party resources (100% of weight)
Info::
12 resources over 200KB
111 resources · 10.5 MiB · 110 third-party 9.5 MiB over 1MB target
Image 51% · 5.4 MiB
Media 31% · 3.3 MiB
JavaScript 15% · 1.6 MiB
CSS 1% · 149.0 KiB
Font 1% · 73.6 KiB
Document 0% · 26.4 KiB
Other 0% · 14.4 KiB

~529.4 KiB of savings available

Remove unused JavaScript: 529.4 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
62 images, 0 KB saveable
REVIEW
62 images, 0 KB saveable
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.
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.
62 images 5.4 MB
0 oversized -0 KB
59 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

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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.4 s LCP 11.4 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 28 ms — font-display: swaphttps://fonts.gstatic.com/s/cormorantgaramond/v21/co3bmX5slCNuHLi8bLeY9MK7whWMhyjYqXtKky2F7g.woff2co3bmX5slCNuHLi8bLeY9MK... https://fonts.gstatic.com/s/cormorantgaramond/v21/co3bmX5slCNuHLi8bLeY9MK7whWMhyjYqXtKky2F7g.woff2 — 36.9 KiB — 31 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 28 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
co3bmX5slCNuHLi8bLeY9MK... woff2 swap
Size 37 KB
Load time 31 ms
Start 1.0 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
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
111 requests over 3020ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.4 s LCP 11.4 shttps://nationalgallery.org.uk// https://nationalgallery.org.uk/ — 302 — 358 B — 96 ms — h2https://www.nationalgallery.org.uk/www.nationalgallery.org.uk/ https://www.nationalgallery.org.uk/ — 200 — 14.1 KiB — 480 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 — 51 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 — 71.7 KiB — 240 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 — 313 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 — 267 ms — h2https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 27.0 KiB — 38 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 — 662 B — 95 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 — 112 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 — 90 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 — 111 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 — 23 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 — 194.0 KiB — 329 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 — 947 B — 35 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 — 165 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 — 332 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 — 106 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 — 432 B — 109 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 — 793 B — 111 ms — h2https://www.nationalgallery.org.uk/media/f1ib0cwv/animated-banner-sprin-still-_v2.png?width=576&height=324&quality=85www.nationalgallery.org.uk/media/f1... https://www.nationalgallery.org.uk/media/f1ib0cwv/animated-banner-sprin-still-_v2.png?width=576&height=324&quality=85 — 200 — 334.4 KiB — 588 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 — 465 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 — 472 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 — 207.2 KiB — 588 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 — 536 ms — h2https://www.nationalgallery.org.uk/media/tvcbd4xg/visit-carousel-must-see-paintings-1820-or-1080-high.jpg?rmode=max&width=576&height=740&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=576&height=740&quality=85 — 200 — 56.2 KiB — 397 ms — h2https://www.nationalgallery.org.uk/media/orkld5kt/visit-carousel-eat-and-drink-1820-or-1080-high.jpg?rmode=max&width=576&height=740&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=576&height=740&quality=85 — 200 — 72.1 KiB — 515 ms — 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h2https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=b52d9b45ba033fb56f748b04c540047b8ea1413e1776898302arclight.vimeo.com/add/player-stats... https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=b52d9b45ba033fb56f748b04c540047b8ea1413e1776898302 — 200 — 11 B — 22 ms — h3https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=b52d9b45ba033fb56f748b04c540047b8ea1413e1776898302arclight.vimeo.com/add/player-stats... https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=b52d9b45ba033fb56f748b04c540047b8ea1413e1776898302 — 200 — 11 B — 25 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-QX7LS2HRVL&gtm=45je64k1v882441149z86410364za20gzb6410364zd6410364&_p=1776898302483&gcs=G100&gcd=13q3p3q3q5l1&npa=1&dma_cps=-&dma=0&tcfd=1265k&gdid=dMWZhNz&_eu=EA&are=1&cid=176378030.1776898304&frm=0&ir=1&pscdl=denied&rcb=19&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401~117512543&dl=https%3A%2F%2Fwww.nationalgallery.org.uk%2F&sid=1776898303&sct=1&seg=0&dt=The%20National%20Gallery%2C%20London&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=2701www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-QX7LS2HRVL&gtm=45je64k1v882441149z86410364za20gzb6410364zd6410364&_p=1776898302483&gcs=G100&gcd=13q3p3q3q5l1&npa=1&dma_cps=-&dma=0&tcfd=1265k&gdid=dMWZhNz&_eu=EA&are=1&cid=176378030.1776898304&frm=0&ir=1&pscdl=denied&rcb=19&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401~117512543&dl=https%3A%2F%2Fwww.nationalgallery.org.uk%2F&sid=1776898303&sct=1&seg=0&dt=The%20National%20Gallery%2C%20London&_tu=CA&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=2701 — 204 — 557 B — 38 ms — h2https://skyfire.vimeocdn.com/1776901902-0xeebadbe8240fc437306248e05af350f043a656a5/2a689b69-62f4-4f6a-88b2-89b9d6ad9ee8/psid=7ebbc2ccb2ef71a10e6579fe0dfdfd7f7471036286b9c55e85035fe54c1559ce/v2/range/prot/cmFuZ2U9NDM1MjA0LTkyMjg3Mw/avf/ada82cb4-7c4e-4e92-952e-02e5dd151a03.mp4?pathsig=8c953e4f~hLceX6xFghDBVsXK765-bf3PsFC187P9Ov1q1U7DZWs&r=dXMtY2VudHJhbDE%3D&range=435204-922873skyfire.vimeocdn.com/1776901902-0xe... https://skyfire.vimeocdn.com/1776901902-0xeebadbe8240fc437306248e05af350f043a656a5/2a689b69-62f4-4f6a-88b2-89b9d6ad9ee8/psid=7ebbc2ccb2ef71a10e6579fe0dfdfd7f7471036286b9c55e85035fe54c1559ce/v2/range/prot/cmFuZ2U9NDM1MjA0LTkyMjg3Mw/avf/ada82cb4-7c4e-4e92-952e-02e5dd151a03.mp4?pathsig=8c953e4f~hLceX6xFghDBVsXK765-bf3PsFC187P9Ov1q1U7DZWs&r=dXMtY2VudHJhbDE%3D&range=435204-922873 — 200 — 476.7 KiB — 25 ms — h2https://skyfire.vimeocdn.com/1776901902-0xeebadbe8240fc437306248e05af350f043a656a5/2a689b69-62f4-4f6a-88b2-89b9d6ad9ee8/psid=7ebbc2ccb2ef71a10e6579fe0dfdfd7f7471036286b9c55e85035fe54c1559ce/v2/range/prot/cmFuZ2U9OTIyODc0LTEwOTk5Njc/avf/ada82cb4-7c4e-4e92-952e-02e5dd151a03.mp4?pathsig=8c953e4f~tLnQ9VjBeZo2RF0UG97YD9LTvgxlOQ_-WdlzKQ0EkT4&r=dXMtY2VudHJhbDE%3D&range=922874-1099967skyfire.vimeocdn.com/1776901902-0xe... https://skyfire.vimeocdn.com/1776901902-0xeebadbe8240fc437306248e05af350f043a656a5/2a689b69-62f4-4f6a-88b2-89b9d6ad9ee8/psid=7ebbc2ccb2ef71a10e6579fe0dfdfd7f7471036286b9c55e85035fe54c1559ce/v2/range/prot/cmFuZ2U9OTIyODc0LTEwOTk5Njc/avf/ada82cb4-7c4e-4e92-952e-02e5dd151a03.mp4?pathsig=8c953e4f~tLnQ9VjBeZo2RF0UG97YD9LTvgxlOQ_-WdlzKQ0EkT4&r=dXMtY2VudHJhbDE%3D&range=922874-1099967 — 200 — 173.2 KiB — 12 ms — h2https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=b52d9b45ba033fb56f748b04c540047b8ea1413e1776898302arclight.vimeo.com/add/player-stats... https://arclight.vimeo.com/add/player-stats?beacon=1&session-id=b52d9b45ba033fb56f748b04c540047b8ea1413e1776898302 — 200 — 11 B — 27 ms — h3https://lensflare.vimeo.com/add/vimeo.watch_video_heartbeatlensflare.vimeo.com/add/vimeo.watch... https://lensflare.vimeo.com/add/vimeo.watch_video_heartbeat — 200 — 0 B — 34 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 5387ms · 1370KB · £28/mo
www.nationalgallery.org.uk
Other
Costly
Execution 1049ms
Transfer 14 KB
Monthly Cost £5/mo
consent.cookiebot.com
Other
Costly
Execution 1029ms
Transfer 295 KB
Monthly Cost £5/mo
Unattributable
Other
Costly
Execution 806ms
Transfer 0 KB
Monthly Cost £4/mo
www.nationalgallery.org.uk
Other
Costly
Execution 572ms
Transfer 194 KB
Unused 79%
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 441ms
Transfer 157 KB
Unused 40%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Costly
Execution 327ms
Transfer 137 KB
Unused 48%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Costly
Execution 269ms
Transfer 177 KB
Unused 40%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Costly
Execution 261ms
Transfer 143 KB
Unused 46%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Costly
Execution 224ms
Transfer 137 KB
Unused 47%
Monthly Cost £1/mo
consent.cookiebot.com
Other
Costly
Execution 208ms
Transfer 27 KB
Monthly Cost £1/mo
consent.cookiebot.com
Other
Optional
Execution 101ms
Transfer 66 KB
Unused 73%
Monthly Cost £1/mo
www.nationalgallery.org.uk
Other
Optional
Execution 100ms
Transfer 22 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.nationalgallery.org.uk adds 1049ms and costs ~£5/month
  • consent.cookiebot.com adds 1029ms and costs ~£5/month
  • Unattributable adds 806ms and costs ~£4/month
  • www.nationalgallery.org.uk adds 572ms and costs ~£3/month
  • Google Tag Manager adds 441ms and costs ~£2/month
  • Google Tag Manager adds 327ms and costs ~£2/month
  • Google Tag Manager adds 269ms and costs ~£1/month
  • Google Tag Manager adds 261ms and costs ~£1/month
  • Google Tag Manager adds 224ms and costs ~£1/month
  • consent.cookiebot.com adds 208ms 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 1049ms 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 1029ms 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 806ms 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

www.nationalgallery.org.uk takes 572ms 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

Google Tag Manager takes 441ms 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

Google Tag Manager takes 327ms 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

Google Tag Manager takes 269ms 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

Google Tag Manager takes 261ms 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

Google Tag Manager takes 224ms 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 208ms 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

73% of consent.cookiebot.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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