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https://bestbuy.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
60
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.

1.84 s

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

2.00 s

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

2.35 s

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

0.029

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

14.32 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.

10.04 s

Page Load Progression

2.3 s
4.6 s
7.0 s
9.3 s
11.6 s
13.9 s
16.2 s
18.5 s
Checks
17
7 PASS 4 REVIEW 4 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 (1.0 MiB of 1.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6152ms total JS execution
FIX
6152ms total JS execution
Warning::
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY...: 1688ms CPU time
Warning::
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY...: 1453ms CPU time
Warning::
Unattributable: 1176ms CPU time
Warning::
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY...: 1040ms CPU time
Warning::
https://assets.bbystatic.com/analytics-dotcom/anal...: 344ms CPU time
Warning::
Third-party scripts: 6152ms (100% of total)

Main Thread Breakdown

Script Evaluation 76% Other 13% Script Parsing & Compilation 5% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB1688ms1469ms109ms3rd
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/QX/gde0diDiUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c531020154351453ms1360ms51ms3rd
Unattributable1176ms359ms0ms3rd
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c531020154351040ms971ms46ms3rd
https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js344ms274ms57ms3rd
https://www.bestbuy.com/~assets/bby/_com/cacheable-gvp-66138ea0147dd17ecdc9dc0ac1b86344.min.js221ms168ms50ms3rd
https://www.bestbuy.com/155ms5ms2ms3rd
https://www.bestbuy.com/~assets/bby/_com/analytics-dotcom/initChildPipeline-ffee00971cdf16cacc57f870e14db909.js75ms60ms15ms3rd
D
JS Bundles
Action
14 scripts, 322 KB unused
FIX
14 scripts, 322 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...: 33 KB unused (20%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 322 KB
322 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=3a2f6fb3-a0f7-37d2-7c26-c53102015435161 KB33 KB (20%)✓3rd
https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/QX/gde0diDiUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c53102015435152 KB31 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/_intl/landing_page/js/zepto.min.js10 KB—✓3rd
blob:https://www.bestbuy.com/ee483ea8-a1ee-4baa-b350-b03310bfbc720 KB—✓3rd
https://www.bestbuy.com/~assets/bby/_com/legacy-66138ea0147dd17ecdc9dc0ac1b86344.min.js7 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.

B
Page Weight Budget
1.0 MB transferred, 72 requests
REVIEW
1.0 MB transferred, 72 requests
Info::
Page weighs 3.0 MB (1.0 MB transferred)
Warning::
JavaScript is 966 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 966 KB
Info::
72 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.0 MB / 2.4 MB budget
1.0 MB transferred
72 requests
0.22 g CO2 per page load
JavaScript 965.9 KiB 90%
Fonts 64.4 KiB 6%
Other 11.9 KiB 1%
Other 9.1 KiB 1%
Images 9.0 KiB 1%
HTML 5.7 KiB 1%
CSS 1.9 KiB 0%
Other 900 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

C
Image Optimization
Action
4 images, 0 KB saveable
REVIEW
4 images, 0 KB saveable
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.
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.
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

B
Page Weight Inventory
72 resources · 1.0 MB · 322 KB savings available
REVIEW
72 resources · 1.0 MB · 322 KB savings available
Warning::
Page weight 45 KB over 1MB target
Got: 1.0 MB Expected: ≤ 1 MB
Info::
~322 KB of savings available
Warning::
71 third-party resources (100% of weight)
72 resources · 1.0 MiB · 71 third-party 44.8 KiB over 1MB target
JavaScript 90% · 965.9 KiB
Font 6% · 64.4 KiB
Other 2% · 21.1 KiB
Image 1% · 9.8 KiB
Document 1% · 5.7 KiB
CSS 0% · 1.9 KiB

~322.0 KiB of savings available

Remove unused JavaScript: 322.0 KiB
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 (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 FCP 1.8 s LCP 2.0 shttps://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 — 8.1 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 — 10.1 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 — 9.1 s — font-display: swap
e4ad7a6cc30f9153dc15124... woff2 swap
Size 21 KB
Load time 8.1 s
Start 8.5 s
Risk FOUT — text flashes from fallback to web font
9b64d8057a58697c89b7d53... woff2 swap
Size 22 KB
Load time 10.1 s
Start 8.5 s
Risk FOUT — text flashes from fallback to web font
5562484cf98053a028aea62... woff2 swap
Size 22 KB
Load time 9.1 s
Start 8.5 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
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
72 requests over 28559ms
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 FCP 1.8 s LCP 2.0 shttps://bestbuy.com// https://bestbuy.com/ — 301 — 101 B — 72 ms — h2https://www.bestbuy.com/www.bestbuy.com/ https://www.bestbuy.com/ — 200 — 4.3 KiB — 8.3 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 — 39 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 — 8.1 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 — 10.0 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 — 35 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 — 69 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 — 112 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 — 111 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkBwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB — 200 — 177.1 KiB — 574 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 — 82 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/QX/gde0diDiUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c53102015435www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/QX/gde0diDiUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c53102015435 — 200 — 152.1 KiB — 386 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 — 8.1 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 — 10.1 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 — 9.1 s — 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 — 8.1 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 — 352 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 — 355 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 — 435 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 — 344 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 — 445 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 — 438 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 — 441 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 — 438 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 — 345 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 — 448 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 — 434 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 FCP 1.8 s LCP 2.0 shttps://bestbuy.com// https://bestbuy.com/ — 301 — 101 B — 72 ms — h2https://www.bestbuy.com/www.bestbuy.com/ https://www.bestbuy.com/ — 200 — 4.3 KiB — 8.3 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 — 39 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 — 8.1 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 — 10.0 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 — 35 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 — 69 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 — 112 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 — 111 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkBwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB — 200 — 177.1 KiB — 574 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 — 82 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/QX/gde0diDiUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c53102015435www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/QX/gde0diDiUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c53102015435 — 200 — 152.1 KiB — 386 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 — 8.1 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 — 10.1 s — h2https://www.bestbuy.com/~assets/bby/_com/sc-pattern-library/dist/5562484cf98053a028aea627e45d4b7c.woff2www.bestbuy.com/~assets/bby/_com/sc... 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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 — 344 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 — 445 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 — 438 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 — 441 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 — 438 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 — 345 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 — 448 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 — 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 — 444 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 — 440 ms — 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 — 320 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 — 98 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 — 99 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 — 101 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 — 99 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 — 100 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 — 100 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 — 100 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 — 101 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 — 101 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 — 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 — 104 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 — 184 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 — 190 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 — 187 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 — 190 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 — 181 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 — 188 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 — 192 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 — 189 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 — 179 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 — 193 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 — 190 ms — h2blob:https://www.bestbuy.com/ee483ea8-a1ee-4baa-b350-b03310bfbc72www.bestbuy.com/ee483ea8-a1ee-4baa-... blob:https://www.bestbuy.com/ee483ea8-a1ee-4baa-b350-b03310bfbc72 — -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 — 221 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkBwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/Oh7JNXY1t5O5NSm9Yz/DS92/Ag/EkeEMhegkB — 200 — 177.1 KiB — 32 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c53102015435www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg?v=3a2f6fb3-a0f7-37d2-7c26-c53102015435 — 200 — 161.2 KiB — 156 ms — 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h2blob:https://www.bestbuy.com/830f8220-0695-4b8e-89c9-813dfd3b4a9awww.bestbuy.com/830f8220-0695-4b8e-... blob:https://www.bestbuy.com/830f8220-0695-4b8e-89c9-813dfd3b4a9a — -1 — 0 B — 0 ms — https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAgwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/An/xnDRptUSUPAg — 200 — 1.5 KiB — 146 ms — h2https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/QX/gde0diDiUPAgwww.bestbuy.com/kTtl3VDlj0BuKOaNiQ/... https://www.bestbuy.com/kTtl3VDlj0BuKOaNiQ/LN7JNXY1t5O5/D1Z6/QX/gde0diDiUPAg — 200 — 244 B — 115 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 6152ms · 600KB · $82/mo
www.bestbuy.com
Other
Costly
Execution 1688ms
Transfer 1 KB
Unused 21%
Monthly Cost $22/mo
www.bestbuy.com
Other
Costly
Execution 1453ms
Transfer 152 KB
Unused 20%
Monthly Cost $19/mo
Unattributable
Other
Costly
Execution 1176ms
Transfer 0 KB
Monthly Cost $16/mo
www.bestbuy.com
Other
Costly
Execution 1040ms
Transfer 161 KB
Unused 20%
Monthly Cost $14/mo
assets.bbystatic.com
Other
Costly
Execution 344ms
Transfer 86 KB
Unused 55%
Monthly Cost $5/mo
www.bestbuy.com
Other
Costly
Execution 221ms
Transfer 158 KB
Unused 74%
Monthly Cost $3/mo
www.bestbuy.com
Other
Optional
Execution 155ms
Transfer 4 KB
Monthly Cost $2/mo
www.bestbuy.com
Other
Optional
Execution 75ms
Transfer 37 KB
Unused 56%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.bestbuy.com adds 1688ms and costs ~$22/month
  • www.bestbuy.com adds 1453ms and costs ~$19/month
  • Unattributable adds 1176ms and costs ~$16/month
  • www.bestbuy.com adds 1040ms and costs ~$14/month
  • assets.bbystatic.com adds 344ms and costs ~$5/month
  • www.bestbuy.com adds 221ms and costs ~$3/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 1688ms 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 1453ms 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 1176ms 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 1040ms 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

assets.bbystatic.com takes 344ms 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

www.bestbuy.com takes 221ms 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

74% of www.bestbuy.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

56% of www.bestbuy.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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