Performance
· 15 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.
1.79 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.82 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
89 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.
2.39 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.
3.88 s
Page Load Progression
FPage Weight BudgetAction3.6 MB transferred, 91 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 BundlesAction43 scripts, 654 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.squarespace.com/universal/scripts-compressed/common-685e8299b71caa80-min.en-US.js | 341 KB | 220 KB (65%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/commerce-ad9e32fad34293d6-min.en-US.js | 233 KB | 191 KB (82%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/common-vendors-88286999a7ee6fd5-min.en-US.js | 168 KB | 59 KB (35%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202303.2.0/otBannerSdk.js | 97 KB | 51 KB (53%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/extract-css-moment-js-vendor-6f2a1f6ec9a41489-min.en-US.js | 44 KB | 43 KB (98%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/common-vendors-stable-b8d716935110c7b2-min.en-US.js | 69 KB | 40 KB (58%) | ✓ | 3rd |
| https://definitions.sqspcdn.com/website-component-definition/static-assets/website.components.imageFluid/43f3bffd-97e5-4cb9-811f-04bc8781637a_450/748.js | 27 KB | 27 KB (100%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/37231-bcc4a187272711dd-min.en-US.js | 39 KB | 23 KB (58%) | ✓ | 3rd |
| https://definitions.sqspcdn.com/website-component-definition/static-assets/website.components.button/42b39610-dda4-4709-81b5-5174793864bd_633/website.components.button.visitor.js | 4 KB | — | ✓ | 3rd |
| https://definitions.sqspcdn.com/website-component-definition/static-assets/website.components.imageFluid/43f3bffd-97e5-4cb9-811f-04bc8781637a_450/image-effect-film-grain.js | 3 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 InventoryAction91 resources · 3.6 MB · 654 KB savings availableFIX
~654.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 91 resources | 3.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization14 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS Execution CostAction1069ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.wholefoodsmarket.co.uk/ | 364ms | 10ms | 5ms | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/common-685e8299b71caa80-min.en-US.js | 281ms | 221ms | 38ms | 3rd |
| Unattributable | 150ms | 19ms | 0ms | 3rd |
| https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/site-bundle.751dde8889efc787c3a375da4e4d2c66.js | 111ms | 74ms | 4ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202303.2.0/otBannerSdk.js | 98ms | 59ms | 13ms | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/53473-9cce148b1268e4b6-min.en-US.js | 65ms | 64ms | 2ms | 3rd |
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 Loading4 fonts (162 KB)PASS
Web fonts
4
162 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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)
Fixing the unchecked items could save ~41 KB and ~82 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall91 requests over 1641msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.wholefoodsmarket.co.uk www.wholefoodsmarket.co.uk | Other | 364ms | 36 KB | — | €2/mo | Costly |
assets.squarespace.com assets.squarespace.com | Other | 281ms | 341 KB | 65% | €1/mo | Costly |
Unattributable Unattributable | Other | 150ms | 0 KB | — | €1/mo | Optional |
static1.squarespace.com static1.squarespace.com | Other | 111ms | 38 KB | — | €1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 98ms | 97 KB | 53% | €1/mo | Essential |
assets.squarespace.com assets.squarespace.com | Other | 65ms | 17 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- www.wholefoodsmarket.co.uk adds 364ms and costs ~€2/month
- assets.squarespace.com adds 281ms and costs ~€1/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
www.wholefoodsmarket.co.uk takes 364ms 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
assets.squarespace.com takes 281ms 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
65% of assets.squarespace.com'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
53% of OneTrust'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