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.
1.10 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.86 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
663 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.
6.37 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.
6.19 s
Page Load Progression
2.4 s
4.8 s
7.2 s
9.6 s
12.0 s
14.4 s
16.8 s
19.2 sFPage Weight BudgetAction17.2 MB transferred, 421 requestsFIX
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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4393ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/1080-83d1a03871c5de1c.js?dpl=e7833e0-main | 1472ms | 1329ms | 18ms | 3rd |
| Unattributable | 893ms | 86ms | 0ms | 3rd |
| https://www.wayfair.com/ | 418ms | 42ms | 24ms | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/acc06427.ef2e0f5b74834995.js | 269ms | 218ms | 7ms | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/9297-9768283fd85797c7.js | 258ms | 207ms | 44ms | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/1dd3208c-8a00d5b6312d0293.js?dpl=e7833e0-main | 240ms | 195ms | 10ms | 3rd |
| https://prx.wayfair.com/px/client/main.min.js | 227ms | 206ms | 5ms | 3rd |
| https://cdn.quantummetric.com/qscripts/quantum-wayfair.js | 218ms | 197ms | 8ms | 3rd |
| https://js.datadome.co/tags.js | 84ms | 74ms | 2ms | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/(standard)/layout-261916759edd4946.js | 76ms | 30ms | 45ms | 3rd |
Showing top 10 of 14 scripts
FJS BundlesAction91 scripts, 2.0 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/9297-9768283fd85797c7.js | 509 KB | 479 KB (94%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/(standard)/homepage/page-aa179623c64c5428.js | 361 KB | 337 KB (93%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/layout-714f2ab78ab273e1.js | 299 KB | 286 KB (96%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/(standard)/layout-261916759edd4946.js | 340 KB | 234 KB (69%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/(standard)/homepage/error-95c451685daf0d1e.js | 311 KB | 91 KB (29%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/103-9791d694ae55075b.js | 111 KB | 77 KB (69%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/d778532c-554cc333fce211b7.js | 59 KB | 59 KB (100%) | ✓ | 3rd |
| https://prx.wayfair.com/px/client/main.min.js | 129 KB | 57 KB (44%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/acc06427.ef2e0f5b74834995.js | 113 KB | 56 KB (50%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/318-28ec0e4c8296afb0.js | 50 KB | 47 KB (94%) | ✓ | 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 InventoryAction421 resources · 17.2 MB · 2.0 MB savings availableFIX
~2.0 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 421 resources | 17.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization17 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
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
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
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
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 Loading2 fonts (59 KB)PASS
Web fonts
2
59 KB total
Render-blocking
0
of 2
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
Network Waterfall421 requests over 43412msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
assets.wfcdn.com assets.wfcdn.com | Other | 1472ms | 32 KB | — | $20/mo | Costly |
Unattributable Unattributable | Other | 893ms | 0 KB | — | $12/mo | Costly |
www.wayfair.com www.wayfair.com | Other | 418ms | 138 KB | — | $6/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 269ms | 113 KB | 50% | $4/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 258ms | 509 KB | 94% | $3/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 240ms | 53 KB | — | $3/mo | Costly |
prx.wayfair.com prx.wayfair.com | Other | 227ms | 129 KB | 44% | $3/mo | Costly |
cdn.quantummetric.com cdn.quantummetric.com | Other | 218ms | 115 KB | 38% | $3/mo | Costly |
js.datadome.co js.datadome.co | Other | 84ms | 39 KB | — | $1/mo | Optional |
assets.wfcdn.com assets.wfcdn.com | Other | 76ms | 340 KB | 69% | $1/mo | Optional |
assets.wfcdn.com assets.wfcdn.com | Other | 62ms | 219 KB | — | $1/mo | Optional |
assets.wfcdn.com assets.wfcdn.com | Other | 60ms | 361 KB | 93% | $1/mo | Optional |
assets.wfcdn.com assets.wfcdn.com | Other | 60ms | 299 KB | 96% | $1/mo | Optional |
assets.wfcdn.com assets.wfcdn.com | Other | 57ms | 62 KB | 74% | $1/mo | Optional |
These scripts may cost more than they're worth
- assets.wfcdn.com adds 1472ms and costs ~$20/month
- Unattributable adds 893ms and costs ~$12/month
- www.wayfair.com adds 418ms and costs ~$6/month
- assets.wfcdn.com adds 269ms and costs ~$4/month
- assets.wfcdn.com adds 258ms and costs ~$3/month
- assets.wfcdn.com adds 240ms and costs ~$3/month
- prx.wayfair.com adds 227ms and costs ~$3/month
- cdn.quantummetric.com adds 218ms and costs ~$3/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
assets.wfcdn.com takes 1472ms 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 893ms 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
www.wayfair.com takes 418ms 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.wfcdn.com takes 269ms 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
50% of assets.wfcdn.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
assets.wfcdn.com takes 258ms 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
94% of assets.wfcdn.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
assets.wfcdn.com takes 240ms 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
prx.wayfair.com takes 227ms 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
cdn.quantummetric.com takes 218ms 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
69% of assets.wfcdn.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
93% of assets.wfcdn.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
96% of assets.wfcdn.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
74% of assets.wfcdn.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