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https://www.walmart.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.45 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

11.87 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

2.83 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.

7.27 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.

14.91 s

Page Load Progression

615 ms
1.2 s
1.8 s
2.5 s
3.1 s
3.7 s
4.3 s
4.9 s
Checks
16
7 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 340 requests
FIX
2.5 MB transferred, 340 requests
Warning::
Page weighs 8.5 MB (2.5 MB transferred)
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Warning::
340 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.53 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
340 requests
0.53 g CO2 per page load
JavaScript 1.5 MiB 59%
Other 470.1 KiB 18%
Images 243.6 KiB 9%
Other 117.9 KiB 5%
HTML 71.5 KiB 3%
CSS 67.6 KiB 3%
Fonts 61.4 KiB 2%
Other 14.5 KiB 1%
Other 5.8 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
87% third-party, 0 ms blocking
FIX
87% third-party, 0 ms blocking
Warning::
Third-party code accounts for 87% of page weight (2.2 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
87%
First-party Third-party
F
JS Execution Cost
Action
9814ms total JS execution
FIX
9814ms total JS execution
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 2211ms CPU time
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 1706ms CPU time
Warning::
Unattributable: 1687ms CPU time
Warning::
https://www.walmart.com/: 1431ms CPU time
Warning::
https://www.walmart.com/px/PXu6b0qd2S/init.js: 811ms CPU time
Warning::
Third-party scripts: 7065ms (72% of total)

Main Thread Breakdown

Script Evaluation 60% Other 20% Script Parsing & Compilation 9% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/framework-f63ef51b63b99aa1.js2211ms1992ms22ms3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/pages/_app-8ce0a64dbd90c0dc.js1706ms1274ms341ms3rd
Unattributable1687ms288ms0ms3rd
https://www.walmart.com/1431ms93ms4ms1st
https://www.walmart.com/px/PXu6b0qd2S/init.js811ms728ms37ms1st
https://www.walmart.com/~partytown/partytown-sandbox-sw.html?1775592226130508ms465ms4ms1st
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/pages/index-222493b829a4e664.js388ms372ms1ms3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/ads_core_utils_get-viewport-1b3df28c5688dffd.js307ms223ms84ms3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/main-3897228db92d0e87.js276ms205ms62ms3rd
https://b.www.walmart.com/rum.js?bh=beacon.lightest.walmart.com171ms163ms4ms3rd

Showing top 10 of 13 scripts

F
JS Bundles
Action
166 scripts, 2.4 MB unused
FIX
166 scripts, 2.4 MB unused
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 560 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 560 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 425 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 90 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 90 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.4 MB
2410 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/ads_core_utils_get-viewport-1b3df28c5688dffd.js0 KB560 KB (92%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/ads_core_utils_get-viewport-1b3df28c5688dffd.js139 KB560 KB (92%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/pages/_app-8ce0a64dbd90c0dc.js709 KB425 KB (60%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/cart_product-tile-container_cart-product-tile-d1b70712d3b99093.js27 KB90 KB (93%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/cart_product-tile-container_cart-product-tile-d1b70712d3b99093.js0 KB90 KB (93%)✓3rd
https://www.walmart.com/px/PXu6b0qd2S/init.js137 KB73 KB (53%)✓1st
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/ads_core_hooks_use-intersection-observable-e8bb1a3c5abd2ed9.js0 KB53 KB (83%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/ads_core_hooks_use-intersection-observable-e8bb1a3c5abd2ed9.js18 KB53 KB (83%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/checkout_bookslot-shortcut_bookslot-shortcut-view-0e182a6e14e69566.js11 KB40 KB (94%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/checkout_bookslot-shortcut_bookslot-shortcut-view-0e182a6e14e69566.js0 KB40 KB (94%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: max-age=0, no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
B
Image Optimization
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Warning::
https://i5.walmartimages.com/dfw/4ff9c6c9-9e6a/k2-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
20 images 244 KB
0 oversized -0 KB
8 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
3 fonts (61 KB)
PASS
3 fonts (61 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

61 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 2.5 s LCP 11.9 shttps://i5.walmartimages.com/dfw/63fd9f59-7d95/36d53a64-d69e-4b5d-aec5-5205e3b975f5/v1/ES.woff2ES.woff2 https://i5.walmartimages.com/dfw/63fd9f59-7d95/36d53a64-d69e-4b5d-aec5-5205e3b975f5/v1/ES.woff2 — 12.9 KiB — 0 ms — font-display: swaphttps://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/media/ui-icons.0a573231.woff2ui-icons.0a573231.woff2 https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/media/ui-icons.0a573231.woff2 — 36.4 KiB — 0 ms — font-display: swaphttps://i5.walmartimages.com/dfw/63fd9f59-581c/294cde33-8d74-4638-a582-6a0f942c0c18/v1/ESB.woff2ESB.woff2 https://i5.walmartimages.com/dfw/63fd9f59-581c/294cde33-8d74-4638-a582-6a0f942c0c18/v1/ESB.woff2 — 12.2 KiB — 0 ms — font-display: swap
ES.woff2 woff2 swap
Size 13 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ui-icons.0a573231.woff2 woff2 swap
Size 36 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
ESB.woff2 woff2 swap
Size 12 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
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 Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
90 hints, 0 missing preconnects
PASS
90 hints, 0 missing preconnects
Info::
Page uses 90 resource hint(s)

Current Resource Hints

preconnect
4
preload
1
dns-prefetch
1
prefetch
+74
84

90 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
340 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
72% of JavaScript execution is third-party
First-party Third-party 7065ms · 867KB · $40/mo
i5.walmartimages.com
Other
Costly
Execution 2211ms
Transfer 49 KB
Unused 51%
Monthly Cost $13/mo
i5.walmartimages.com
Other
Costly
Execution 1706ms
Transfer 709 KB
Unused 60%
Monthly Cost $10/mo
Unattributable
Other
Costly
Execution 1687ms
Transfer 0 KB
Monthly Cost $10/mo
i5.walmartimages.com
Other
Costly
Execution 388ms
Transfer 1 KB
Monthly Cost $2/mo
i5.walmartimages.com
Other
Costly
Execution 307ms
Transfer 0 KB
Unused 92%
Monthly Cost $2/mo
i5.walmartimages.com
Other
Costly
Execution 276ms
Transfer 34 KB
Monthly Cost $2/mo
b.www.walmart.com
Other
Optional
Execution 171ms
Transfer 1 KB
Monthly Cost $1/mo
i5.walmartimages.com
Other
Optional
Execution 135ms
Transfer 0 KB
Monthly Cost $1/mo
i5.walmartimages.com
Other
Optional
Execution 104ms
Transfer 7 KB
Monthly Cost $1/mo
i5.walmartimages.com
Other
Optional
Execution 79ms
Transfer 68 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • i5.walmartimages.com adds 2211ms and costs ~$13/month
  • i5.walmartimages.com adds 1706ms and costs ~$10/month
  • Unattributable adds 1687ms and costs ~$10/month
  • i5.walmartimages.com adds 388ms and costs ~$2/month
  • i5.walmartimages.com adds 307ms and costs ~$2/month
  • i5.walmartimages.com adds 276ms and costs ~$2/month

72% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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

i5.walmartimages.com takes 2211ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

51% of i5.walmartimages.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

i5.walmartimages.com takes 1706ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

60% of i5.walmartimages.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Unattributable takes 1687ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

i5.walmartimages.com takes 388ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

i5.walmartimages.com takes 307ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

92% of i5.walmartimages.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

i5.walmartimages.com takes 276ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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