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https://www.walmart.com

Performance

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

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
83
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.

661 ms

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

1.16 s

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

1.00 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.027

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.15 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.

5.62 s

Page Load Progression

444 ms
887 ms
1.3 s
1.8 s
2.2 s
2.7 s
3.1 s
3.5 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 410 requests
FIX
3.6 MB transferred, 410 requests
Warning::
Page weighs 11.4 MB (3.6 MB transferred)
Warning::
JavaScript is 2.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.1 MB
Warning::
410 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.75 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
410 requests
0.75 g CO2 per page load
JavaScript 2.1 MiB 59%
Other 975.2 KiB 27%
Images 279.7 KiB 8%
HTML 85.0 KiB 2%
CSS 70.5 KiB 2%
Fonts 61.2 KiB 2%
Other 15.0 KiB 0%
Other 12.8 KiB 0%
Other 6.6 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
86% third-party, 0 ms blocking
FIX
86% third-party, 0 ms blocking
Warning::
Third-party code accounts for 86% of page weight (3.1 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
86%
First-party Third-party
F
JS Execution Cost
Action
4762ms total JS execution
FIX
4762ms total JS execution
Warning::
https://client.px-cloud.net/PXu6b0qd2S/main.min.js: 1563ms CPU time
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 646ms CPU time
Warning::
https://www.walmart.com/px/PXu6b0qd2S/captcha/capt...: 603ms CPU time
Warning::
Unattributable: 543ms CPU time
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 347ms CPU time
Warning::
Third-party scripts: 3493ms (73% of total)

Main Thread Breakdown

Script Evaluation 61% Style & Layout 16% Other 13% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://client.px-cloud.net/PXu6b0qd2S/main.min.js1563ms872ms7ms3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/framework-f63ef51b63b99aa1.js646ms595ms9ms3rd
https://www.walmart.com/px/PXu6b0qd2S/captcha/captcha.js?a=c&m=0&u=edef00e0-32bc-11f1-860a-df268765f99a&v=ee08fead-32bc-11f1-a789-0855e56ef413&g=b603ms549ms14ms1st
Unattributable543ms13ms0ms3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/pages/_app-8ce0a64dbd90c0dc.js347ms244ms83ms3rd
https://www.walmart.com/273ms27ms1ms1st
https://www.walmart.com/px/PXu6b0qd2S/init.js216ms179ms14ms1st
https://www.walmart.com/~partytown/partytown-sandbox-sw.html?1775592248260177ms153ms1ms1st
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/cart_data-access_utils_enhanced-ds-util-3bb13288fdf7a4f7.js155ms136ms19ms3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/main-3897228db92d0e87.js84ms62ms7ms3rd

Showing top 10 of 12 scripts

F
JS Bundles
Action
242 scripts, 5.1 MB unused
FIX
242 scripts, 5.1 MB unused
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 696 KB unused (90%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 696 KB unused (90%)
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...: 560 KB unused (92%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-561c/572...: 416 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 5.1 MB
5216 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/cart_data-access_utils_enhanced-ds-util-3bb13288fdf7a4f7.js179 KB696 KB (90%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/cart_data-access_utils_enhanced-ds-util-3bb13288fdf7a4f7.js0 KB696 KB (90%)✓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.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.js140 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 KB416 KB (59%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/item_buy-box_add-to-cart-section_atc-buynow-4fcdc18eb72d99a2.js0 KB193 KB (84%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/item_buy-box_add-to-cart-section_atc-buynow-4fcdc18eb72d99a2.js59 KB193 KB (84%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/checkout_buy-now_buy-now-button-705688511e973526.js0 KB145 KB (81%)✓3rd
https://i5.walmartimages.com/dfw/63fd9f59-561c/572f7d54-ce02-4198-b7a2-891176a4324d/v2/en-US/_next/static/chunks/checkout_buy-now_buy-now-button-705688511e973526.js41 KB145 KB (81%)✓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

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
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://i5.walmartimages.com/dfw/63fd9f59-14e2/9d3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 280 KB
0 oversized -0 KB
4 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 500 ms 1.0 s FCP 661 ms LCP 1.2 shttps://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 — 12.1 KiB — 0 ms — font-display: swaphttps://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 — 12.8 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 — 36.2 KiB — 0 ms — font-display: swap
ESB.woff2 woff2 swap
Size 12 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
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
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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
410 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
73% of JavaScript execution is third-party
First-party Third-party 3493ms · 794KB · $20/mo
client.px-cloud.net
Other
Costly
Execution 1563ms
Transfer 0 KB
Unused 48%
Monthly Cost $9/mo
i5.walmartimages.com
Other
Costly
Execution 646ms
Transfer 50 KB
Unused 50%
Monthly Cost $4/mo
Unattributable
Other
Costly
Execution 543ms
Transfer 0 KB
Monthly Cost $3/mo
i5.walmartimages.com
Other
Costly
Execution 347ms
Transfer 709 KB
Unused 59%
Monthly Cost $2/mo
i5.walmartimages.com
Other
Optional
Execution 155ms
Transfer 0 KB
Unused 90%
Monthly Cost $1/mo
i5.walmartimages.com
Other
Optional
Execution 84ms
Transfer 34 KB
Monthly Cost $0/mo
i5.walmartimages.com
Other
Optional
Execution 83ms
Transfer 1 KB
Monthly Cost $0/mo
i5.walmartimages.com
Other
Optional
Execution 72ms
Transfer 0 KB
Unused 92%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • client.px-cloud.net adds 1563ms and costs ~$9/month
  • i5.walmartimages.com adds 646ms and costs ~$4/month
  • Unattributable adds 543ms and costs ~$3/month
  • i5.walmartimages.com adds 347ms and costs ~$2/month

73% 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

client.px-cloud.net takes 1563ms 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 646ms 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

50% 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 543ms 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 347ms 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

59% 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

90% 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

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

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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