Performance
· 24 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.
926 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.34 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
81 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.51 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.
2.35 s
Page Load Progression
DThird-Party ImpactAction98% third-party, 0 ms blockingFIX
FJS BundlesAction44 scripts, 519 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.squarespace.com/universal/scripts-compressed/common-0b17e92e877ead8e-min.en-US.js | 255 KB | 157 KB (61%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/commerce-6c1901df676a71d0-min.en-US.js | 186 KB | 154 KB (83%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/common-vendors-d036b63cd556aa15-min.en-US.js | 180 KB | 67 KB (37%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/extract-css-moment-js-vendor-5b1fd9aed201e910-min.en-US.js | 59 KB | 58 KB (98%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/common-vendors-stable-590e3e89b3319eb6-min.en-US.js | 69 KB | 40 KB (58%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/18788-37aece4cef74a9e3-min.en-US.js | 28 KB | 22 KB (78%) | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/performance-5aa74b6a09904ebf-min.en-US.js | 33 KB | 22 KB (66%) | ✓ | 3rd |
| https://definitions.sqspcdn.com/website-component-definition/static-assets/website.components.imageFluid/b68f4315-2190-4f75-b82c-7fecd49919c4_1042/21575.js | 16 KB | — | ✓ | 3rd |
| https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/section-divider.b3a21411477bb441a60d.js | 3 KB | — | ✓ | 3rd |
| https://assets.squarespace.com/universal/scripts-compressed/user-account-core-7d641bf58e867ff9-min.en-US.js | 29 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 InventoryAction63 resources · 1.8 MB · 519 KB savings availableFIX
~519.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 63 resources | 1.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.8 MB transferred, 63 requestsREVIEW
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
BJS Execution Cost924ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://assets.squarespace.com/universal/scripts-compressed/common-0b17e92e877ead8e-min.en-US.js | 391ms | 238ms | 20ms | 3rd |
| https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/8706.9f9354c132882253b6ae.js | 237ms | 122ms | 1ms | 3rd |
| https://www.mercedes-blanche.com/ | 155ms | 5ms | 3ms | 1st |
| https://static1.squarespace.com/static/vta/5c5a519771c10ba3470d8101/scripts/site-bundle.52c5e172465bde21589d94024ac19bbf.js | 79ms | 46ms | 3ms | 3rd |
| Unattributable | 62ms | 2ms | 0ms | 1st |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BDocument CompressionDocument response uses gzip; brotli would be ~20% smallerREVIEW
CAsset CompressionAction1 of 3 asset hosts serve text uncompressedREVIEW
BMain HTML Cache-ControlNo Cache-Control header on main HTML responseREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Image Optimization4 images, 0 KB saveablePASS
A+Font Loading3 fonts (43 KB)PASS
Web fonts
3
43 KB total
Render-blocking
0
of 3
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 HintsNo optimization neededPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
Network Waterfall63 requests over 1090msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
assets.squarespace.com assets.squarespace.com | Other | 391ms | 255 KB | 61% | $2/mo | Costly |
static1.squarespace.com static1.squarespace.com | Other | 237ms | 14 KB | — | $1/mo | Costly |
static1.squarespace.com static1.squarespace.com | Other | 79ms | 39 KB | — | $0/mo | Optional |
These scripts may cost more than they're worth
- assets.squarespace.com adds 391ms and costs ~$2/month
- static1.squarespace.com adds 237ms and costs ~$1/month
77% 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
assets.squarespace.com takes 391ms 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
61% 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
static1.squarespace.com takes 237ms 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
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-10-14 — 2026-11-10)
LCP (p75)
3662 ms
46% good
INP (p75)
0 ms
0% good
CLS (p75)
0.060
97% good
FCP (p75)
1551 ms
TTFB (p75)
653 ms
Image Optimization9 images, 204 KB total, 70 KB wastedINFO
Image Optimization Audit
Total Images
9
Total Size
204 KB
Oversized
1
Wasted
70 KB