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.
3.86 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
18.63 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
5.09 s
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.
16.79 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.
31.51 s
Page Load Progression
2.2 s
4.5 s
6.7 s
8.9 s
11.2 s
13.4 s
15.7 s
17.9 sFPage Weight BudgetAction29.8 MB transferred, 361 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 CostAction17709ms 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 | 5033ms | 4515ms | 13ms | 3rd |
| Unattributable | 4167ms | 237ms | 0ms | 3rd |
| https://www.wayfair.com/ | 1691ms | 150ms | 128ms | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/(standard)/homepage/error-95c451685daf0d1e.js | 1061ms | 877ms | 163ms | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/acc06427.ef2e0f5b74834995.js | 1054ms | 954ms | 35ms | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/1dd3208c-8a00d5b6312d0293.js?dpl=e7833e0-main | 1047ms | 913ms | 16ms | 3rd |
| https://cdn.quantummetric.com/qscripts/quantum-wayfair.js | 837ms | 761ms | 28ms | 3rd |
| https://prx.wayfair.com/px/client/main.min.js | 782ms | 656ms | 66ms | 3rd |
| https://js.datadome.co/tags.js | 336ms | 300ms | 9ms | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/(standard)/layout-261916759edd4946.js | 310ms | 111ms | 199ms | 3rd |
Showing top 10 of 19 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 | 508 KB | 478 KB (94%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/(standard)/homepage/page-aa179623c64c5428.js | 362 KB | 301 KB (83%) | ✓ | 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 | 272 KB (80%) | ✓ | 3rd |
| https://assets.wfcdn.com/webpack/sf-ui-core-funnel/_next/static/chunks/app/(standard)/homepage/error-95c451685daf0d1e.js | 311 KB | 86 KB (28%) | ✓ | 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 InventoryAction361 resources · 29.8 MB · 2.0 MB savings availableFIX
~2.0 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 361 resources | 29.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization15 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
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall361 requests over 43244msINFO
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 | 5033ms | 32 KB | — | $67/mo | Costly |
Unattributable Unattributable | Other | 4167ms | 0 KB | — | $55/mo | Costly |
www.wayfair.com www.wayfair.com | Other | 1691ms | 141 KB | — | $22/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 1061ms | 311 KB | 28% | $14/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 1054ms | 113 KB | 50% | $14/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 1047ms | 53 KB | — | $14/mo | Costly |
cdn.quantummetric.com cdn.quantummetric.com | Other | 837ms | 115 KB | 38% | $11/mo | Costly |
prx.wayfair.com prx.wayfair.com | Other | 782ms | 129 KB | 44% | $10/mo | Costly |
js.datadome.co js.datadome.co | Other | 336ms | 39 KB | — | $4/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 310ms | 340 KB | 80% | $4/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 262ms | 362 KB | 83% | $3/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 255ms | 299 KB | 96% | $3/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 237ms | 62 KB | 74% | $3/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 207ms | 508 KB | 94% | $3/mo | Costly |
assets.wfcdn.com assets.wfcdn.com | Other | 201ms | 219 KB | — | $3/mo | Costly |
cdn02.taggstar.com cdn02.taggstar.com | Other | 69ms | 30 KB | 76% | $1/mo | Optional |
assets.wfcdn.com assets.wfcdn.com | Other | 56ms | 40 KB | 62% | $1/mo | Optional |
assets.wfcdn.com assets.wfcdn.com | Other | 54ms | 59 KB | 100% | $1/mo | Optional |
cdn02.taggstar.com cdn02.taggstar.com | Other | 52ms | 4 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- assets.wfcdn.com adds 5033ms and costs ~$67/month
- Unattributable adds 4167ms and costs ~$55/month
- www.wayfair.com adds 1691ms and costs ~$22/month
- assets.wfcdn.com adds 1061ms and costs ~$14/month
- assets.wfcdn.com adds 1054ms and costs ~$14/month
- assets.wfcdn.com adds 1047ms and costs ~$14/month
- cdn.quantummetric.com adds 837ms and costs ~$11/month
- prx.wayfair.com adds 782ms and costs ~$10/month
- js.datadome.co adds 336ms and costs ~$4/month
- assets.wfcdn.com adds 310ms and costs ~$4/month
- assets.wfcdn.com adds 262ms and costs ~$3/month
- assets.wfcdn.com adds 255ms and costs ~$3/month
- assets.wfcdn.com adds 237ms and costs ~$3/month
- assets.wfcdn.com adds 207ms and costs ~$3/month
- assets.wfcdn.com adds 201ms 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 5033ms 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 4167ms 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 1691ms 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 1061ms 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 1054ms 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 1047ms 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 837ms 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 782ms 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
js.datadome.co takes 336ms 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 310ms 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
80% 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 262ms 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
83% 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 255ms 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
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
assets.wfcdn.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
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
assets.wfcdn.com takes 207ms 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 201ms 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 cdn02.taggstar.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
62% 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
100% 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