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https://bestbuy.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

746 ms

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

786 ms

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

232 ms

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

0.014

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

6.89 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.

2.14 s

Page Load Progression

2.6 s
5.2 s
7.7 s
10.3 s
12.9 s
15.5 s
18.1 s
20.7 s
Checks
15
6 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (916.6 KiB of 916.7 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
14 scripts, 323 KB unused
FIX
14 scripts, 323 KB unused
Warning::
https://www.bestbuy.com/~assets/bby/_com/cacheable...: 117 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.bbystatic.com/analytics-dotcom/anal...: 47 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY...: 37 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY...: 37 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY...: 32 KB unused (20%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 323 KB
323 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.bestbuy.com/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac1b86344.min.js158 KB117 KB (74%)✓3rd
https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js86 KB47 KB (55%)✓3rd
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB177 KB37 KB (21%)✓3rd
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB177 KB37 KB (21%)✓3rd
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=7bbf911e-ec9c-671e-202b-e675973b54350 KB32 KB (20%)✓3rd
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=7bbf911e-ec9c-671e-202b-e675973b5435161 KB32 KB (20%)✓3rd
https://www.bestbuy.com/~assets/bby/_com/analytics-dotcom/initChildPipeline-ffee00971cdf16cacc57f870e14db909.js37 KB20 KB (56%)✓3rd
https://www.bestbuy.com/~assets/bby/_com/legacy-66138ea0147dd17ecdc9dc0ac1b86344.min.js7 KB—✓3rd
blob:https://www.bestbuy.com/9c5f2b05-7e46-4492-80bb-4a8c6c02d9400 KB—✓3rd
https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/app.min.js1 KB—✓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

F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
4 images, 0 KB saveable
REVIEW
4 images, 0 KB saveable
Warning::
https://www.bestbuy.com/~assets/bby/_intl/landing_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bestbuy.com/~assets/bby/_intl/landing_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bestbuy.com/~assets/bby/_intl/landing_... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bestbuy.com/~assets/bby/_com/header-fo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 9 KB
0 oversized -0 KB
4 legacy format
4 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

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

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

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
JS Execution Cost
Action
1429ms total JS execution
REVIEW
1429ms total JS execution
Warning::
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY...: 624ms CPU time
Warning::
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY...: 435ms CPU time
Warning::
Unattributable: 285ms CPU time
Info::
https://assets.bbystatic.com/analytics-dotcom/anal...: 85ms CPU time
Warning::
Third-party scripts: 1429ms (100% of total)

Main Thread Breakdown

Script Evaluation 75% Other 13% Script Parsing & Compilation 6% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=7bbf911e-ec9c-671e-202b-e675973b5435624ms570ms37ms3rd
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB435ms376ms30ms3rd
Unattributable285ms79ms0ms3rd
https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js85ms75ms8ms3rd
B
Page Weight Inventory
72 resources · 917 KB · 323 KB savings available
REVIEW
72 resources · 917 KB · 323 KB savings available
Info::
Within 1MB page-weight target
Got: 917 KB
Info::
~323 KB of savings available
Warning::
71 third-party resources (100% of weight)
72 resources · 916.7 KiB · 71 third-party Within 1MB page-weight target
JavaScript 89% · 814.0 KiB
Font 7% · 64.4 KiB
Other 2% · 20.9 KiB
Image 1% · 9.8 KiB
Document 1% · 5.7 KiB
CSS 0% · 1.9 KiB

~323.0 KiB of savings available

Remove unused JavaScript: 323.0 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
917 KB transferred, 72 requests
PASS
917 KB transferred, 72 requests
Info::
Page weighs 3.0 MB (917 KB transferred)
Warning::
JavaScript is 814 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 814 KB
Info::
72 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
917 KB / 2.4 MB budget
917 KB transferred
72 requests
0.19 g CO2 per page load
JavaScript 814.0 KiB 89%
Fonts 64.4 KiB 7%
Other 11.7 KiB 1%
Other 9.1 KiB 1%
Images 9.0 KiB 1%
HTML 5.7 KiB 1%
CSS 1.9 KiB 0%
Other 897 B 0%
0 2.4 MB 4.9 MB
Under 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

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 (64 KB)
PASS
3 fonts (64 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

64 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 14.0 s 16.0 s 18.0 s 20.0 s FCP 746 ms LCP 786 mshttps://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/e4ad7a6cc30f9153dc15124aa8ec616c.woff2e4ad7a6cc30f9153dc15124... https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/e4ad7a6cc30f9153dc15124aa8ec616c.woff2 — 20.7 KiB — 10.1 s — font-display: swaphttps://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/9b64d8057a58697c89b7d537d4f5f809.woff29b64d8057a58697c89b7d53... https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/9b64d8057a58697c89b7d537d4f5f809.woff2 — 21.9 KiB — 8.0 s — font-display: swaphttps://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/5562484cf98053a028aea627e45d4b7c.woff25562484cf98053a028aea62... https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/5562484cf98053a028aea627e45d4b7c.woff2 — 21.7 KiB — 8.0 s — font-display: swap
e4ad7a6cc30f9153dc15124... woff2 swap
Size 21 KB
Load time 10.1 s
Start 10.6 s
Risk FOUT — text flashes from fallback to web font
9b64d8057a58697c89b7d53... woff2 swap
Size 22 KB
Load time 8.0 s
Start 10.6 s
Risk FOUT — text flashes from fallback to web font
5562484cf98053a028aea62... woff2 swap
Size 22 KB
Load time 8.0 s
Start 10.6 s
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
72 requests over 30682ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s FCP 746 ms LCP 786 mshttps://bestbuy.com// https://bestbuy.com/ — 301 — 101 B — 110 ms — h2https://www.bestbuy.com/www.bestbuy.com/ https://www.bestbuy.com/ — 200 — 4.2 KiB — 10.4 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/css/app.csswww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/css/app.css — 200 — 1.9 KiB — 28 ms — h2https://www.bestbuy.com/~assets/bby/_com/header-footer/images/bby_logo-a7e90594729ed2e119331378def6c97e.pngwww.bestbuy.com/~assets/bby/_com/he... https://www.bestbuy.com/~assets/bby/_com/header-footer/images/bby_logo-a7e90594729ed2e119331378def6c97e.png — 200 — 6.7 KiB — 10.0 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/canada.svgwww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/canada.svg — 200 — 1.0 KiB — 9.0 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/usa.svgwww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/usa.svg — 200 — 689 B — 8.1 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/icons/arrow.svgwww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/icons/arrow.svg — 200 — 679 B — 10.1 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/zepto.min.jswww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/zepto.min.js — 200 — 9.7 KiB — 47 ms — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/app.min.jswww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/app.min.js — 200 — 1.0 KiB — 49 ms — h2https://www.bestbuy.com/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac1b86344.min.jswww.bestbuy.com/~assets/bby/_com/ca... https://www.bestbuy.com/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac1b86344.min.js — 200 — 158.3 KiB — 99 ms — h2https://www.bestbuy.com/~assets/bby/_com/legacy-66138ea0147dd17ecdc9dc0ac1b86344.min.jswww.bestbuy.com/~assets/bby/_com/le... https://www.bestbuy.com/~assets/bby/_com/legacy-66138ea0147dd17ecdc9dc0ac1b86344.min.js — 200 — 6.7 KiB — 95 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkBwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB — 200 — 177.0 KiB — 106 ms — h2https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.jsassets.bbystatic.com/analytics-dotc... https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js — 200 — 85.9 KiB — 25 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=7bbf911e-ec9c-671e-202b-e675973b5435www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=7bbf911e-ec9c-671e-202b-e675973b5435 — 200 — 161.2 KiB — 106 ms — h2https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/e4ad7a6cc30f9153dc15124aa8ec616c.woff2www.bestbuy.com/~assets/bby/_com/sc... https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/e4ad7a6cc30f9153dc15124aa8ec616c.woff2 — 200 — 20.7 KiB — 10.1 s — h2https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/9b64d8057a58697c89b7d537d4f5f809.woff2www.bestbuy.com/~assets/bby/_com/sc... https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/9b64d8057a58697c89b7d537d4f5f809.woff2 — 200 — 21.9 KiB — 8.0 s — h2https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/5562484cf98053a028aea627e45d4b7c.woff2www.bestbuy.com/~assets/bby/_com/sc... https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/5562484cf98053a028aea627e45d4b7c.woff2 — 200 — 21.7 KiB — 8.0 s — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkBwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB — 201 — 1.0 KiB — 280 ms — h2https://www.bestbuy.com/~assets/bby/_com/analytics-dotcom/sandbox-index-21.42.20.html?parentOrigin=https%3A%2F%2Fwww.bestbuy.com&env=prodwww.bestbuy.com/~assets/bby/_com/an... https://www.bestbuy.com/~assets/bby/_com/analytics-dotcom/sandbox-index-21.42.20.html?parentOrigin=https%3A%2F%2Fwww.bestbuy.com&env=prod — 200 — 1.4 KiB — 9.0 s — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 434 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 433 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 426 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 521 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 548 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 527 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 524 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 519 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 423 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 152 B — 420 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 532 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s FCP 746 ms LCP 786 mshttps://bestbuy.com// https://bestbuy.com/ — 301 — 101 B — 110 ms — h2https://www.bestbuy.com/www.bestbuy.com/ https://www.bestbuy.com/ — 200 — 4.2 KiB — 10.4 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/css/app.csswww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/css/app.css — 200 — 1.9 KiB — 28 ms — h2https://www.bestbuy.com/~assets/bby/_com/header-footer/images/bby_logo-a7e90594729ed2e119331378def6c97e.pngwww.bestbuy.com/~assets/bby/_com/he... https://www.bestbuy.com/~assets/bby/_com/header-footer/images/bby_logo-a7e90594729ed2e119331378def6c97e.png — 200 — 6.7 KiB — 10.0 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/canada.svgwww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/canada.svg — 200 — 1.0 KiB — 9.0 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/usa.svgwww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/maps/usa.svg — 200 — 689 B — 8.1 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/icons/arrow.svgwww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/images/icons/arrow.svg — 200 — 679 B — 10.1 s — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/zepto.min.jswww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/zepto.min.js — 200 — 9.7 KiB — 47 ms — h2https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/app.min.jswww.bestbuy.com/~assets/bby/_intl/l... https://www.bestbuy.com/~assets/bby/_intl/landing_page/js/app.min.js — 200 — 1.0 KiB — 49 ms — h2https://www.bestbuy.com/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac1b86344.min.jswww.bestbuy.com/~assets/bby/_com/ca... https://www.bestbuy.com/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac1b86344.min.js — 200 — 158.3 KiB — 99 ms — h2https://www.bestbuy.com/~assets/bby/_com/legacy-66138ea0147dd17ecdc9dc0ac1b86344.min.jswww.bestbuy.com/~assets/bby/_com/le... https://www.bestbuy.com/~assets/bby/_com/legacy-66138ea0147dd17ecdc9dc0ac1b86344.min.js — 200 — 6.7 KiB — 95 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkBwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB — 200 — 177.0 KiB — 106 ms — h2https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.jsassets.bbystatic.com/analytics-dotc... https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js — 200 — 85.9 KiB — 25 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=7bbf911e-ec9c-671e-202b-e675973b5435www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=7bbf911e-ec9c-671e-202b-e675973b5435 — 200 — 161.2 KiB — 106 ms — h2https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/e4ad7a6cc30f9153dc15124aa8ec616c.woff2www.bestbuy.com/~assets/bby/_com/sc... https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/e4ad7a6cc30f9153dc15124aa8ec616c.woff2 — 200 — 20.7 KiB — 10.1 s — h2https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/9b64d8057a58697c89b7d537d4f5f809.woff2www.bestbuy.com/~assets/bby/_com/sc... https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/9b64d8057a58697c89b7d537d4f5f809.woff2 — 200 — 21.9 KiB — 8.0 s — h2https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/5562484cf98053a028aea627e45d4b7c.woff2www.bestbuy.com/~assets/bby/_com/sc... 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https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 433 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 426 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 521 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 548 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 527 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 524 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 519 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 423 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 152 B — 420 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 532 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 540 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 540 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... 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https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 507 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 520 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 535 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 525 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 532 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 522 ms — 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h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkBwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB — 201 — 1.1 KiB — 316 ms — h2https://www.bestbuy.com/~assets/bby/_com/analytics-dotcom/initChildPipeline-ffee00971cdf16cacc57f870e14db909.jswww.bestbuy.com/~assets/bby/_com/an... https://www.bestbuy.com/~assets/bby/_com/analytics-dotcom/initChildPipeline-ffee00971cdf16cacc57f870e14db909.js — 200 — 36.8 KiB — 11 ms — h2https://www.bestbuy.ca/bbyus-redirect-map/map.jsonwww.bestbuy.ca/bbyus-redirect-map/m... https://www.bestbuy.ca/bbyus-redirect-map/map.json — 200 — 9.1 KiB — 80 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 102 ms — h2https://fel-api.prod.browse.bestbuy.com/exceptionfel-api.prod.browse.bestbuy.com/exc... https://fel-api.prod.browse.bestbuy.com/exception — 200 — 151 B — 103 ms — h2https://www.bestbuy.com/~assets/bby/_com/header-footer/images/favicon-32.pngwww.bestbuy.com/~assets/bby/_com/he... https://www.bestbuy.com/~assets/bby/_com/header-footer/images/favicon-32.png — 200 — 796 B — 10.0 s — h2blob:https://www.bestbuy.com/dc9b0387-83ad-46ee-a663-8a8f507a18ecwww.bestbuy.com/dc9b0387-83ad-46ee-... blob:https://www.bestbuy.com/dc9b0387-83ad-46ee-a663-8a8f507a18ec — -1 — 0 B — 0 ms — blob:https://www.bestbuy.com/f49cd4ae-5b15-4501-bbcc-de58f8dd8e5dwww.bestbuy.com/f49cd4ae-5b15-4501-... blob:https://www.bestbuy.com/f49cd4ae-5b15-4501-bbcc-de58f8dd8e5d — -1 — 0 B — 0 ms — blob:https://www.bestbuy.com/4a2e288e-8559-4638-a955-95f0b2284a2cwww.bestbuy.com/4a2e288e-8559-4638-... blob:https://www.bestbuy.com/4a2e288e-8559-4638-a955-95f0b2284a2c — -1 — 0 B — 0 ms — https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkBwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB — 201 — 1.1 KiB — 243 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAgwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg — 200 — 1.5 KiB — 178 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAgwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg — 200 — 244 B — 243 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1429ms · 87KB · $19/mo
www.bestbuy.com
Other
Costly
Execution 624ms
Transfer 0 KB
Unused 20%
Monthly Cost $8/mo
www.bestbuy.com
Other
Costly
Execution 435ms
Transfer 1 KB
Unused 21%
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 285ms
Transfer 0 KB
Monthly Cost $4/mo
assets.bbystatic.com
Other
Optional
Execution 85ms
Transfer 86 KB
Unused 55%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.bestbuy.com adds 624ms and costs ~$8/month
  • www.bestbuy.com adds 435ms and costs ~$6/month
  • Unattributable adds 285ms and costs ~$4/month

100% 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

www.bestbuy.com takes 624ms 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

www.bestbuy.com takes 435ms 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

Unattributable takes 285ms 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

55% of assets.bbystatic.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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