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https://foodnetwork.co.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
60
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.

631 ms

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

1.37 s

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

44 ms

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

0.008

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

924 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.05 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 3 REVIEW 5 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 66 requests
FIX
2.9 MB transferred, 66 requests
Warning::
Page weighs 6.9 MB (2.9 MB transferred)
Warning::
Images are 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
66 HTTP requests
Info::
Estimated 0.60 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
66 requests
0.60 g CO2 per page load
Images 1.7 MiB 59%
JavaScript 1.0 MiB 36%
HTML 71.8 KiB 2%
CSS 46.7 KiB 2%
Fonts 14.8 KiB 1%
Other 2.0 KiB 0%
Other 1.9 KiB 0%
Other 0 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

D
Third-Party Impact
Action
78% third-party, 0 ms blocking
FIX
78% third-party, 0 ms blocking
Warning::
Third-party code accounts for 78% of page weight (2.2 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
22%
78%
First-party Third-party
F
JS Bundles
Action
13 scripts, 596 KB unused
FIX
13 scripts, 596 KB unused
Warning::
https://s.ntv.io/serve/load.js: 191 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://foodnetwork.co.uk/build/assets/app-BJFf2AC...: 158 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://foodnetwork.co.uk/static-js/prebid7.12.0.j...: 80 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WHC...: 71 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.whisk.com/sdk/shopping-list.js: 58 KB unused (91%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 596 KB
596 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://s.ntv.io/serve/load.js251 KB191 KB (76%)✓3rd
https://foodnetwork.co.uk/build/assets/app-BJFf2ACq.js310 KB158 KB (51%)✓1st
https://foodnetwork.co.uk/static-js/prebid7.12.0.js100 KB80 KB (80%)✓1st
https://www.googletagmanager.com/gtm.js?id=GTM-WHCQZ5T126 KB71 KB (57%)✓3rd
https://cdn.whisk.com/sdk/shopping-list.js64 KB58 KB (91%)✓3rd
https://8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app/e7d4aac7-7c82-4bb4-a499-57dccccec460-web.js190 KB37 KB (20%)✓3rd
https://cdn.tagdeliver.com/cipt/17137.js21 KB—✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js0 KB—✓3rd
https://foodnetwork.co.uk/build/assets/Home-BmOHrub0.js2 KB—✓1st
https://foodnetwork.co.uk/build/assets/Default-BJvL1A7B.js1 KB—✓1st

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
66 resources · 2.9 MB · 596 KB savings available
FIX
66 resources · 2.9 MB · 596 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~596 KB of savings available
Warning::
35 third-party resources (78% of weight)
Info::
4 resources over 200KB
66 resources · 2.9 MiB · 35 third-party 1.9 MiB over 1MB target
Image 59% · 1.7 MiB
JavaScript 36% · 1.0 MiB
Document 2% · 71.9 KiB
CSS 2% · 46.7 KiB
Font 1% · 14.8 KiB
Other 0% · 3.7 KiB

~595.5 KiB of savings available

Remove unused JavaScript: 595.5 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.

B
Image Optimization
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Info::
All images are well-optimized
35 images 1.7 MB
0 oversized -0 KB
14 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
821ms total JS execution
REVIEW
821ms total JS execution
Warning::
https://foodnetwork.co.uk/: 342ms CPU time
Info::
https://foodnetwork.co.uk/build/assets/app-BJFf2AC...: 223ms CPU time
Info::
Unattributable: 118ms CPU time
Info::
https://s.ntv.io/serve/load.js: 81ms CPU time
Info::
https://8512b548-2306-4976-a576-a880f2c35e4e.edge....: 57ms CPU time
Info::
Third-party scripts: 255ms (31% of total)

Main Thread Breakdown

Script Evaluation 37% Other 25% Style & Layout 21% Script Parsing & Compilation 8% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://foodnetwork.co.uk/342ms44ms1ms1st
https://foodnetwork.co.uk/build/assets/app-BJFf2ACq.js223ms137ms1ms1st
Unattributable118ms2ms0ms3rd
https://s.ntv.io/serve/load.js81ms60ms19ms3rd
https://8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app/e7d4aac7-7c82-4bb4-a499-57dccccec460-web.js57ms33ms21ms3rd
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 (15 KB)
PASS
7 fonts (15 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

15 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 FCP 631 ms LCP 1.4 shttps://foodnetwork.co.uk/fonts/gilroy-ultralight-webfont.woff2gilroy-ultralight-webfo... https://foodnetwork.co.uk/fonts/gilroy-ultralight-webfont.woff2 — 131 B — 38 ms — font-display: swaphttps://foodnetwork.co.uk/fonts/gilroy-light-webfont.woff2gilroy-light-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-light-webfont.woff2 — 119 B — 38 ms — font-display: swaphttps://foodnetwork.co.uk/fonts/gilroy-regular-webfont.woff2gilroy-regular-webfont.... https://foodnetwork.co.uk/fonts/gilroy-regular-webfont.woff2 — 119 B — 29 ms — font-display: swaphttps://foodnetwork.co.uk/fonts/gilroy-medium-webfont.woff2gilroy-medium-webfont.w... https://foodnetwork.co.uk/fonts/gilroy-medium-webfont.woff2 — 157 B — 46 ms — font-display: swaphttps://foodnetwork.co.uk/fonts/gilroy-semibold-webfont.woff2gilroy-semibold-webfont... https://foodnetwork.co.uk/fonts/gilroy-semibold-webfont.woff2 — 117 B — 38 ms — font-display: swaphttps://foodnetwork.co.uk/fonts/gilroy-bold-webfont.woff2gilroy-bold-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-bold-webfont.woff2 — 353 B — 29 ms — font-display: swaphttps://foodnetwork.co.uk/fonts/FoodNetwork.woff2FoodNetwork.woff2 https://foodnetwork.co.uk/fonts/FoodNetwork.woff2 — 13.8 KiB — 4 ms — font-display: swap
gilroy-ultralight-webfo... woff2 swap
Size 0 KB
Load time 38 ms
Start 24 ms
Risk FOUT — text flashes from fallback to web font
gilroy-light-webfont.woff2 woff2 swap
Size 0 KB
Load time 38 ms
Start 24 ms
Risk FOUT — text flashes from fallback to web font
gilroy-regular-webfont.... woff2 swap
Size 0 KB
Load time 29 ms
Start 24 ms
Risk FOUT — text flashes from fallback to web font
gilroy-medium-webfont.w... woff2 swap
Size 0 KB
Load time 46 ms
Start 24 ms
Risk FOUT — text flashes from fallback to web font
gilroy-semibold-webfont... woff2 swap
Size 0 KB
Load time 38 ms
Start 25 ms
Risk FOUT — text flashes from fallback to web font
gilroy-bold-webfont.woff2 woff2 swap
Size 0 KB
Load time 29 ms
Start 25 ms
Risk FOUT — text flashes from fallback to web font
FoodNetwork.woff2 woff2 swap
Size 14 KB
Load time 4 ms
Start 166 ms
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
66 requests over 2824ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 631 ms LCP 1.4 shttps://foodnetwork.co.uk// https://foodnetwork.co.uk/ — 200 — 71.8 KiB — 9 ms — h2https://foodnetwork.co.uk/fonts/gilroy-ultralight-webfont.woff2/fonts/gilroy-ultralight-webfont.wo... https://foodnetwork.co.uk/fonts/gilroy-ultralight-webfont.woff2 — 404 — 131 B — 38 ms — h2https://foodnetwork.co.uk/fonts/gilroy-light-webfont.woff2/fonts/gilroy-light-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-light-webfont.woff2 — 404 — 119 B — 38 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 150 ms — https://foodnetwork.co.uk/fonts/gilroy-regular-webfont.woff2/fonts/gilroy-regular-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-regular-webfont.woff2 — 404 — 119 B — 29 ms — h2https://foodnetwork.co.uk/fonts/gilroy-medium-webfont.woff2/fonts/gilroy-medium-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-medium-webfont.woff2 — 404 — 157 B — 46 ms — h2https://foodnetwork.co.uk/fonts/gilroy-semibold-webfont.woff2/fonts/gilroy-semibold-webfont.woff... https://foodnetwork.co.uk/fonts/gilroy-semibold-webfont.woff2 — 404 — 117 B — 38 ms — h2https://foodnetwork.co.uk/fonts/gilroy-bold-webfont.woff2/fonts/gilroy-bold-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-bold-webfont.woff2 — 404 — 353 B — 29 ms — h2https://foodnetwork.co.uk/build/assets/app-CjuUoRWY.css/build/assets/app-CjuUoRWY.css https://foodnetwork.co.uk/build/assets/app-CjuUoRWY.css — 200 — 39.4 KiB — 33 ms — h2https://foodnetwork.co.uk/build/assets/app-CIP97hy0.css/build/assets/app-CIP97hy0.css https://foodnetwork.co.uk/build/assets/app-CIP97hy0.css — 200 — 7.0 KiB — 32 ms — h2https://foodnetwork.co.uk/build/assets/app-BJFf2ACq.js/build/assets/app-BJFf2ACq.js https://foodnetwork.co.uk/build/assets/app-BJFf2ACq.js — 200 — 309.8 KiB — 67 ms — h2https://foodnetwork.co.uk/images/play-icon.svg/images/play-icon.svg https://foodnetwork.co.uk/images/play-icon.svg — 200 — 438 B — 6 ms — h2https://d2vsf1hynzxim7.cloudfront.net/production/media/27547/responsive-images/Grilled-Lamb-Chops___default_1452_1089.webpd2vsf1hynzxim7.cloudfront.net/produ... https://d2vsf1hynzxim7.cloudfront.net/production/media/27547/responsive-images/Grilled-Lamb-Chops___default_1452_1089.webp — 200 — 463.9 KiB — 68 ms — h2https://foodnetwork.co.uk/static-js/prebid7.12.0.js/static-js/prebid7.12.0.js https://foodnetwork.co.uk/static-js/prebid7.12.0.js — 200 — 99.8 KiB — 49 ms — h2https://cdn.tagdeliver.com/cipt/17137.jscdn.tagdeliver.com/cipt/17137.js https://cdn.tagdeliver.com/cipt/17137.js — 200 — 20.8 KiB — 143 ms — h2https://cdn.whisk.com/sdk/shopping-list.jscdn.whisk.com/sdk/shopping-list.js https://cdn.whisk.com/sdk/shopping-list.js — 200 — 64.3 KiB — 115 ms — h3https://s.ntv.io/serve/load.jss.ntv.io/serve/load.js https://s.ntv.io/serve/load.js — 200 — 251.1 KiB — 90 ms — http/1.1https://foodnetwork.co.uk/images/logo26.png/images/logo26.png https://foodnetwork.co.uk/images/logo26.png — 200 — 8.1 KiB — 28 ms — h2https://d2vsf1hynzxim7.cloudfront.net/production/media/27197/responsive-images/284462_AdamRichamnEatsItaly_S001_8___default_1452_1089.webpd2vsf1hynzxim7.cloudfront.net/produ... https://d2vsf1hynzxim7.cloudfront.net/production/media/27197/responsive-images/284462_AdamRichamnEatsItaly_S001_8___default_1452_1089.webp — 200 — 158.2 KiB — 40 ms — h2https://foodnetwork.co.uk/images/disco+logo.png/images/disco+logo.png https://foodnetwork.co.uk/images/disco+logo.png — 200 — 1.6 KiB — 38 ms — h2https://foodnetwork.co.uk/images/fallback-landscape.webp/images/fallback-landscape.webp https://foodnetwork.co.uk/images/fallback-landscape.webp — 200 — 59.1 KiB — 36 ms — h2https://foodnetwork.co.uk/images/illustrations/top-orange.svg/images/illustrations/top-orange.sv... https://foodnetwork.co.uk/images/illustrations/top-orange.svg — 200 — 9.3 KiB — 40 ms — h2https://foodnetwork.co.uk/images/illustrations/leaf.svg/images/illustrations/leaf.svg https://foodnetwork.co.uk/images/illustrations/leaf.svg — 200 — 7.2 KiB — 26 ms — h2https://foodnetwork.co.uk/images/illustrations/orange-v2.svg/images/illustrations/orange-v2.svg https://foodnetwork.co.uk/images/illustrations/orange-v2.svg — 200 — 10.8 KiB — 26 ms — h2https://foodnetwork.co.uk/images/logo-white.png/images/logo-white.png https://foodnetwork.co.uk/images/logo-white.png — 200 — 3.6 KiB — 31 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WHCQZ5Twww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WHCQZ5T — 200 — 126.4 KiB — 153 ms — h2https://8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app/e7d4aac7-7c82-4bb4-a499-57dccccec460-web.js8512b548-2306-4976-a576-a880f2c35e4... https://8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app/e7d4aac7-7c82-4bb4-a499-57dccccec460-web.js — 200 — 189.6 KiB — 121 ms — h2data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cp…www.w3.org/2000/svg' fill='none' vi... data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cp… — 200 — 0 B — 0 ms — datahttps://d2vsf1hynzxim7.cloudfront.net/production/media/26650/responsive-images/282336_RavneetGillsChopHouse_Generic_S01_7___landscape_711_400.webpd2vsf1hynzxim7.cloudfront.net/produ... https://d2vsf1hynzxim7.cloudfront.net/production/media/26650/responsive-images/282336_RavneetGillsChopHouse_Generic_S01_7___landscape_711_400.webp — 200 — 57.0 KiB — 20 ms — h2https://d2vsf1hynzxim7.cloudfront.net/production/media/26041/responsive-images/SOTCK_S1_3840X2160%5D_LAN-zxx_PUR-tile___landscape_850_478.webpd2vsf1hynzxim7.cloudfront.net/produ... https://d2vsf1hynzxim7.cloudfront.net/production/media/26041/responsive-images/SOTCK_S1_3840X2160%5D_LAN-zxx_PUR-tile___landscape_850_478.webp — 200 — 37.4 KiB — 21 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 631 ms LCP 1.4 shttps://foodnetwork.co.uk// https://foodnetwork.co.uk/ — 200 — 71.8 KiB — 9 ms — h2https://foodnetwork.co.uk/fonts/gilroy-ultralight-webfont.woff2/fonts/gilroy-ultralight-webfont.wo... https://foodnetwork.co.uk/fonts/gilroy-ultralight-webfont.woff2 — 404 — 131 B — 38 ms — h2https://foodnetwork.co.uk/fonts/gilroy-light-webfont.woff2/fonts/gilroy-light-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-light-webfont.woff2 — 404 — 119 B — 38 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — -1 — 0 B — 150 ms — https://foodnetwork.co.uk/fonts/gilroy-regular-webfont.woff2/fonts/gilroy-regular-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-regular-webfont.woff2 — 404 — 119 B — 29 ms — h2https://foodnetwork.co.uk/fonts/gilroy-medium-webfont.woff2/fonts/gilroy-medium-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-medium-webfont.woff2 — 404 — 157 B — 46 ms — h2https://foodnetwork.co.uk/fonts/gilroy-semibold-webfont.woff2/fonts/gilroy-semibold-webfont.woff... https://foodnetwork.co.uk/fonts/gilroy-semibold-webfont.woff2 — 404 — 117 B — 38 ms — h2https://foodnetwork.co.uk/fonts/gilroy-bold-webfont.woff2/fonts/gilroy-bold-webfont.woff2 https://foodnetwork.co.uk/fonts/gilroy-bold-webfont.woff2 — 404 — 353 B — 29 ms — h2https://foodnetwork.co.uk/build/assets/app-CjuUoRWY.css/build/assets/app-CjuUoRWY.css https://foodnetwork.co.uk/build/assets/app-CjuUoRWY.css — 200 — 39.4 KiB — 33 ms — h2https://foodnetwork.co.uk/build/assets/app-CIP97hy0.css/build/assets/app-CIP97hy0.css https://foodnetwork.co.uk/build/assets/app-CIP97hy0.css — 200 — 7.0 KiB — 32 ms — h2https://foodnetwork.co.uk/build/assets/app-BJFf2ACq.js/build/assets/app-BJFf2ACq.js https://foodnetwork.co.uk/build/assets/app-BJFf2ACq.js — 200 — 309.8 KiB — 67 ms — 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Other
Optional
Execution 118ms
Transfer 0 KB
Monthly Cost £2/mo
s.ntv.io
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Execution 81ms
Transfer 251 KB
Unused 76%
Monthly Cost £1/mo
8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app
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Execution 57ms
Transfer 190 KB
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Source: web.dev

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