Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
5.61 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.22 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
958 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.019
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.61 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.
14.26 s
Page Load Progression
FPage Weight BudgetAction3.1 MB transferred, 82 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction5385ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://foodnetwork.co.uk/?utm_source=foodnetwork.com&utm_medium=domestic | 1860ms | 190ms | 6ms | 3rd |
| Unattributable | 1285ms | 480ms | 0ms | 3rd |
| https://foodnetwork.co.uk/build/assets/app-DgXofkk-.js | 894ms | 616ms | 4ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js | 484ms | 204ms | 50ms | 3rd |
| https://s.ntv.io/serve/load.js | 323ms | 243ms | 73ms | 3rd |
| https://8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app/e7d4aac7-7c82-4bb4-a499-57dccccec460-web.js | 254ms | 154ms | 88ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WHCQZ5T | 147ms | 108ms | 38ms | 3rd |
| https://foodnetwork.co.uk/static-js/prebid7.12.0.js | 138ms | 110ms | 27ms | 3rd |
FJS BundlesAction15 scripts, 655 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://s.ntv.io/serve/load.js | 251 KB | 190 KB (76%) | ✓ | 3rd |
| https://foodnetwork.co.uk/build/assets/app-DgXofkk-.js | 309 KB | 158 KB (51%) | ✓ | 3rd |
| https://foodnetwork.co.uk/static-js/prebid7.12.0.js | 100 KB | 79 KB (80%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WHCQZ5T | 126 KB | 71 KB (56%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js | 128 KB | 62 KB (48%) | ✓ | 3rd |
| https://cdn.whisk.com/sdk/shopping-list.js | 64 KB | 58 KB (91%) | ✓ | 3rd |
| https://8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app/e7d4aac7-7c82-4bb4-a499-57dccccec460-web.js | 190 KB | 37 KB (19%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/otSDKStub.js | 9 KB | — | ✓ | 3rd |
| https://foodnetwork.co.uk/build/assets/Home-DR-r42l6.js | 2 KB | — | ✓ | 3rd |
| https://foodnetwork.co.uk/build/assets/Default-CklsOTs7.js | 1 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction82 resources · 3.1 MB · 655 KB savings availableFIX
~655.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 82 resources | 3.1 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization37 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading7 fonts (15 KB)PASS
Web fonts
7
15 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints9 hints, 0 missing preconnectsPASS
Current Resource Hints
9 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall82 requests over 2811msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
foodnetwork.co.uk foodnetwork.co.uk | Other | 1860ms | 72 KB | — | €30/mo | Costly |
Unattributable Unattributable | Other | 1285ms | 0 KB | — | €21/mo | Costly |
foodnetwork.co.uk foodnetwork.co.uk | Other | 894ms | 309 KB | 51% | €14/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 484ms | 128 KB | 48% | €8/mo | Essential |
s.ntv.io s.ntv.io | Other | 323ms | 251 KB | 76% | €5/mo | Costly |
8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app 8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app | Other | 254ms | 190 KB | 19% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 147ms | 126 KB | 56% | €2/mo | Optional |
foodnetwork.co.uk foodnetwork.co.uk | Other | 138ms | 100 KB | 80% | €2/mo | Optional |
These scripts may cost more than they're worth
- foodnetwork.co.uk adds 1860ms and costs ~€30/month
- Unattributable adds 1285ms and costs ~€21/month
- foodnetwork.co.uk adds 894ms and costs ~€14/month
- s.ntv.io adds 323ms and costs ~€5/month
- 8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app adds 254ms and costs ~€4/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
foodnetwork.co.uk takes 1860ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 1285ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
foodnetwork.co.uk takes 894ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
51% of foodnetwork.co.uk's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
s.ntv.io takes 323ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
76% of s.ntv.io's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
8512b548-2306-4976-a576-a880f2c35e4e.edge.permutive.app takes 254ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
56% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
80% of foodnetwork.co.uk's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev