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.
4.91 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
16.54 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
550 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.
7.82 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.
16.75 s
Page Load Progression
DPage Weight BudgetAction2.3 MB transferred, 87 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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2972ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.retaildive.com/ | 625ms | 280ms | 33ms | 3rd |
| Unattributable | 591ms | 11ms | 0ms | 3rd |
| https://cmp.osano.com/AzqdtLT8Mqkut2TZ/991974d1-3bca-4b6d-93e4-fc7f0c35945c/osano.js | 540ms | 461ms | 15ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-M826LBDJHP&cx=c>m=4e64m0h2 | 336ms | 295ms | 36ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-55G8WRR | 288ms | 248ms | 37ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WCZ4CFR>m=4e64m0h2 | 276ms | 227ms | 41ms | 3rd |
| https://www.retaildive.com/static/js/htmx_204.min.js?313321260226 | 146ms | 126ms | 3ms | 3rd |
| https://www.retaildive.com/static/js/jquery_360.min.js?313321260226 | 103ms | 62ms | 6ms | 3rd |
| https://cmp.osano.com/AzqdtLT8Mqkut2TZ/991974d1-3bca-4b6d-93e4-fc7f0c35945c/osano-ui.js | 66ms | 41ms | 12ms | 3rd |
DPage Weight InventoryAction87 resources · 2.3 MB · 205 KB savings availableFIX
~205.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 87 resources | 2.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction25 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
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
CJS BundlesAction41 scripts, 205 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-WCZ4CFR>m=4e64m0h2 | 176 KB | 67 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-M826LBDJHP&cx=c>m=4e64m0h2 | 169 KB | 65 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-55G8WRR | 146 KB | 52 KB (36%) | ✓ | 3rd |
| https://www.retaildive.com/static/js/jquery_360.min.js?313321260226 | 35 KB | 22 KB (61%) | ✓ | 3rd |
| https://www.retaildive.com/static/js/dist/sendEmailToLytics.bundle.js?360116090426 | 1 KB | — | ✓ | 3rd |
| https://www.retaildive.com/static/js/app.js?313321260226 | 6 KB | — | ✗ | 3rd |
| https://www.retaildive.com/static/js/dist/signupReferrer.bundle.js?360116090426 | 1 KB | — | ✓ | 3rd |
| https://www.retaildive.com/static/js/prestitial.js?313321260226 | 2 KB | — | ✓ | 3rd |
| https://www.retaildive.com/static/js/dist/onBoardDiagnostics.bundle.js?360116090426 | 2 KB | — | ✓ | 3rd |
| https://pub.doubleverify.com/dvtag/19913272/DV424940/pub.js | 34 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (252 KB)PASS
Web fonts
6
252 KB total
Render-blocking
0
of 6
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 Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall87 requests over 2354msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.retaildive.com www.retaildive.com | Other | 625ms | 63 KB | — | $8/mo | Costly |
Unattributable Unattributable | Other | 591ms | 0 KB | — | $8/mo | Costly |
cmp.osano.com cmp.osano.com | Other | 540ms | 54 KB | — | $7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 336ms | 169 KB | 39% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 288ms | 146 KB | 36% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 276ms | 176 KB | 38% | $4/mo | Costly |
www.retaildive.com www.retaildive.com | Other | 146ms | 16 KB | — | $2/mo | Optional |
www.retaildive.com www.retaildive.com | Other | 103ms | 35 KB | 61% | $1/mo | Optional |
cmp.osano.com cmp.osano.com | Other | 66ms | 30 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.retaildive.com adds 625ms and costs ~$8/month
- Unattributable adds 591ms and costs ~$8/month
- cmp.osano.com adds 540ms and costs ~$7/month
- Google Tag Manager adds 336ms and costs ~$4/month
- Google Tag Manager adds 288ms and costs ~$4/month
- Google Tag Manager adds 276ms 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
www.retaildive.com takes 625ms 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 591ms 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
cmp.osano.com takes 540ms 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
Google Tag Manager 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
Google Tag Manager takes 288ms 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
Google Tag Manager takes 276ms 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 www.retaildive.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