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https://bestbuy.com

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
8
PASS
8
INFO
3

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

Mobile Desktop
77
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.

576 ms

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

576 ms

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

302 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.

6.69 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.

2.03 s

Page Load Progression

2.5 s
5.1 s
7.6 s
10.2 s
12.7 s
15.3 s
17.8 s
20.3 s
Checks
22
8 PASS 8 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 (888.2 KiB of 888.3 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
14 scripts, 316 KB unused
FIX
14 scripts, 316 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/-cJDnfjvk/Et/H6CugMg/QY1Ep...: 36 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1Ep...: 36 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1Ep...: 30 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 316 KB
316 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/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB169 KB36 KB (21%)✓3rd
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB169 KB36 KB (21%)✓3rd
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f54350 KB30 KB (21%)✓3rd
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f5435147 KB30 KB (21%)✓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/f6bf3b09-97db-45e9-8bca-6dd8277511340 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/_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

C
JS Execution Cost
Action
1415ms total JS execution
REVIEW
1415ms total JS execution
Warning::
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1Ep...: 600ms CPU time
Warning::
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1Ep...: 491ms CPU time
Warning::
Unattributable: 250ms CPU time
Info::
https://assets.bbystatic.com/analytics-dotcom/anal...: 74ms CPU time
Warning::
Third-party scripts: 1165ms (82% of total)

Main Thread Breakdown

Script Evaluation 76% Other 13% Script Parsing & Compilation 5% Garbage Collection 3%
ScriptTotalScriptingParse/CompileParty
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f5435600ms552ms34ms3rd
https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB491ms435ms21ms3rd
Unattributable250ms57ms0ms1st
https://assets.bbystatic.com/analytics-dotcom/analyticsInit-f7791796aa580255fd28610903e3089e.js74ms66ms6ms3rd
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
Page Weight Inventory
72 resources · 888 KB · 316 KB savings available
REVIEW
72 resources · 888 KB · 316 KB savings available
Info::
Within 1MB page-weight target
Got: 888 KB
Info::
~316 KB of savings available
Warning::
71 third-party resources (100% of weight)
72 resources · 888.3 KiB · 71 third-party Within 1MB page-weight target
JavaScript 88% · 784.6 KiB
Font 7% · 64.4 KiB
Other 2% · 21.8 KiB
Image 1% · 9.8 KiB
Document 1% · 5.7 KiB
CSS 0% · 1.9 KiB

~315.9 KiB of savings available

Remove unused JavaScript: 315.9 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
888 KB transferred, 72 requests
PASS
888 KB transferred, 72 requests
Info::
Page weighs 3.0 MB (888 KB transferred)
Warning::
JavaScript is 785 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 785 KB
Info::
72 HTTP requests
Info::
Estimated 0.18 g CO2 per page load
888 KB / 2.4 MB budget
888 KB transferred
72 requests
0.18 g CO2 per page load
JavaScript 784.6 KiB 88%
Fonts 64.4 KiB 7%
Other 12.6 KiB 1%
Other 9.1 KiB 1%
Images 9.0 KiB 1%
HTML 5.7 KiB 1%
CSS 1.9 KiB 0%
Other 898 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 FCP 576 ms LCP 576 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 — 33 ms — 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 — 35 ms — 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 — 36 ms — font-display: swap
e4ad7a6cc30f9153dc15124... woff2 swap
Size 21 KB
Load time 33 ms
Start 10.3 s
Risk FOUT — text flashes from fallback to web font
9b64d8057a58697c89b7d53... woff2 swap
Size 22 KB
Load time 35 ms
Start 10.3 s
Risk FOUT — text flashes from fallback to web font
5562484cf98053a028aea62... woff2 swap
Size 22 KB
Load time 36 ms
Start 10.3 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+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
Network Waterfall
72 requests over 29355ms
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 FCP 576 ms LCP 576 mshttps://bestbuy.com// https://bestbuy.com/ — 301 — 101 B — 123 ms — h2https://www.bestbuy.com/www.bestbuy.com/ https://www.bestbuy.com/ — 200 — 4.3 KiB — 10.1 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 — 12 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 — 9.1 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 — 10.0 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 — 688 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 — 681 B — 8.1 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 — 77 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 — 67 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 — 73 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 — 68 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEBwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB — 200 — 169.5 KiB — 78 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 — 94 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f5435www.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f5435 — 200 — 147.0 KiB — 75 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 — 33 ms — 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 — 35 ms — 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 — 36 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEBwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB — 201 — 1.0 KiB — 265 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 — 1.5 KiB — 9.1 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 — 428 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 — 422 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 — 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 — 418 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 — 416 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 — 421 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 — 526 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 — 510 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 FCP 576 ms LCP 576 mshttps://bestbuy.com// https://bestbuy.com/ — 301 — 101 B — 123 ms — h2https://www.bestbuy.com/www.bestbuy.com/ https://www.bestbuy.com/ — 200 — 4.3 KiB — 10.1 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 — 12 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 — 9.1 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 — 10.0 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 — 688 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 — 681 B — 8.1 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 — 77 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 — 67 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 — 73 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 — 68 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEBwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB — 200 — 169.5 KiB — 78 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 — 94 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f5435www.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f5435 — 200 — 147.0 KiB — 75 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 — 33 ms — 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 — 35 ms — 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 — 36 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEBwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB — 201 — 1.0 KiB — 265 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 — 1.5 KiB — 9.1 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 — 428 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 — 422 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 — 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 — 418 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 — 416 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 — 421 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 — 526 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 — 510 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 — 517 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 — 512 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 — 518 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 — 528 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 — 523 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 — 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 — 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 — 517 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 — 512 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 — 503 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 — 531 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 — 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 — 511 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 — 528 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 — 528 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 — 499 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 — 518 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 — 528 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 — 511 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 — 511 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 — 513 ms — h2blob:https://www.bestbuy.com/f6bf3b09-97db-45e9-8bca-6dd827751134www.bestbuy.com/f6bf3b09-97db-45e9-... blob:https://www.bestbuy.com/f6bf3b09-97db-45e9-8bca-6dd827751134 — -1 — 0 B — 0 ms — https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEBwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB — 201 — 1.1 KiB — 207 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEBwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB — 200 — 169.5 KiB — 50 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f5435www.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO?v=e9def253-756d-fa6a-2f7e-3378218f5435 — 304 — 241 B — 51 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEBwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB — 201 — 1.1 KiB — 225 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 — 15 ms — h2blob:https://www.bestbuy.com/3ecf3c45-f183-4e20-b4de-8e0531a68d83www.bestbuy.com/3ecf3c45-f183-4e20-... blob:https://www.bestbuy.com/3ecf3c45-f183-4e20-b4de-8e0531a68d83 — -1 — 0 B — 0 ms — https://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 — 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://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 — 797 B — 9.0 s — h2blob:https://www.bestbuy.com/ee05a631-b97b-4c7b-bad2-6f35ec699fd8www.bestbuy.com/ee05a631-b97b-4c7b-... blob:https://www.bestbuy.com/ee05a631-b97b-4c7b-bad2-6f35ec699fd8 — -1 — 0 B — 0 ms — blob:https://www.bestbuy.com/0b0a2ca9-9f88-407c-91b8-aaca97e0c659www.bestbuy.com/0b0a2ca9-9f88-407c-... blob:https://www.bestbuy.com/0b0a2ca9-9f88-407c-91b8-aaca97e0c659 — -1 — 0 B — 0 ms — https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEBwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/QY1EprV3Ofkuz8/RUpYAQ/S1cpX/iw0HCEB — 201 — 1.1 KiB — 293 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVOwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO — 200 — 1.5 KiB — 84 ms — h2https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVOwww.bestbuy.com/-cJDnfjvk/Et/H6CugM... https://www.bestbuy.com/-cJDnfjvk/Et/H6CugMg/Lm1EprV3/Uj5gAQ/elVGU/GoCRXVO — 200 — 1.1 KiB — 113 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
82% of JavaScript execution is third-party
First-party Third-party 1165ms · 87KB · $15/mo
www.bestbuy.com
Other
Costly
Execution 600ms
Transfer 0 KB
Unused 21%
Monthly Cost $8/mo
www.bestbuy.com
Other
Costly
Execution 491ms
Transfer 1 KB
Unused 21%
Monthly Cost $7/mo
assets.bbystatic.com
Other
Optional
Execution 74ms
Transfer 86 KB
Unused 55%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.bestbuy.com adds 600ms and costs ~$8/month
  • www.bestbuy.com adds 491ms and costs ~$7/month

82% 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 600ms 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 491ms 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

Image Optimization
12 images, 23 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

12

Total Size

23 KB

3 missing alt text 12 missing dimensions 9 missing lazy loading
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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