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https://starbucks.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
89
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.03 s

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

1.44 s

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

185 ms

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

0.001

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

1.03 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.

3.24 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
5 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 (1.7 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
20 scripts, 460 KB unused
FIX
20 scripts, 460 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Q8JX...: 109 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-VMTH...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P37...: 67 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-Q8JX...: 67 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.starbucks.com/_next/static/chunks/8-4c...: 39 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 460 KB
460 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-Q8JXK1T67J&cx=c&gtm=4e64h1163 KB109 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-VMTHZW7WSM160 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P37KWTP159 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-Q8JXK1T67J163 KB67 KB (41%)✓3rd
https://www.starbucks.com/_next/static/chunks/8-4cb85718db2280f9.js83 KB39 KB (48%)✓3rd
https://cdn.optimizely.com/js/13849340212.js100 KB36 KB (36%)✓3rd
https://jssdkcdns.mparticle.com/js/v2/us1-b96c10bf8d450e45a5f108932f193fc4/mparticle.js?env=0&plan_id=customer_activity_events&66 KB29 KB (44%)✓3rd
https://www.starbucks.com/_next/static/chunks/framework-4c8e7e593a0ef696.js65 KB24 KB (37%)✓3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-172936 KB20 KB (57%)✓3rd
https://www.starbucks.com/_next/static/VGmoUeN71xRFRUW6v7LbN/_buildManifest.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
Page Weight Inventory
Action
57 resources · 1.7 MB · 460 KB savings available
FIX
57 resources · 1.7 MB · 460 KB savings available
Warning::
Page weight 699 KB over 1MB target
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~460 KB of savings available
Warning::
56 third-party resources (100% of weight)
57 resources · 1.7 MiB · 56 third-party 699.1 KiB over 1MB target
JavaScript 64% · 1.1 MiB
Image 24% · 414.4 KiB
Font 8% · 146.3 KiB
Document 2% · 31.1 KiB
CSS 1% · 23.7 KiB
Other 0% · 3.6 KiB

~459.6 KiB of savings available

Remove unused JavaScript: 459.6 KiB
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
Page Weight Budget
Action
1.7 MB transferred, 57 requests
REVIEW
1.7 MB transferred, 57 requests
Info::
Page weighs 4.3 MB (1.7 MB transferred)
Warning::
JavaScript is 1.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.1 MB
Info::
57 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
57 requests
0.35 g CO2 per page load
JavaScript 1.1 MiB 64%
Images 405.7 KiB 24%
Fonts 146.3 KiB 8%
HTML 31.0 KiB 2%
CSS 23.7 KiB 1%
Other 8.0 KiB 0%
Other 2.2 KiB 0%
Other 1.9 KiB 0%
Other 442 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Warning::
https://content-prod-live.cert.starbucks.com/binar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-prod-live.cert.starbucks.com/binar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-prod-live.cert.starbucks.com/binar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-prod-live.cert.starbucks.com/binar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://content-prod-live.cert.starbucks.com/binar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
9 images 406 KB
0 oversized -0 KB
5 legacy format
5 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

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
1427ms total JS execution
REVIEW
1427ms total JS execution
Warning::
https://www.starbucks.com/: 344ms CPU time
Warning::
Unattributable: 301ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-P37...: 218ms CPU time
Info::
https://www.starbucks.com/_next/static/chunks/fram...: 188ms CPU time
Info::
https://cdn.optimizely.com/js/13849340212.js: 151ms CPU time
Warning::
Third-party scripts: 1427ms (100% of total)

Main Thread Breakdown

Script Evaluation 60% Other 13% Style & Layout 12% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.starbucks.com/344ms68ms5ms3rd
Unattributable301ms116ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P37KWTP218ms187ms24ms3rd
https://www.starbucks.com/_next/static/chunks/framework-4c8e7e593a0ef696.js188ms169ms10ms3rd
https://cdn.optimizely.com/js/13849340212.js151ms135ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Q8JXK1T67J99ms75ms23ms3rd
https://www.starbucks.com/_next/static/chunks/pages/%5B%5B...page%5D%5D-7e1584ddbee8de10.js65ms64ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VMTHZW7WSM61ms32ms19ms3rd
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
4 fonts (146 KB)
PASS
4 fonts (146 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

146 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 1.0 s LCP 1.4 shttps://www.starbucks.com/_next/static/media/SoDoSans-Bold.49f6eaa3.woffSoDoSans-Bold.49f6eaa3.... https://www.starbucks.com/_next/static/media/SoDoSans-Bold.49f6eaa3.woff — 37.2 KiB — 128 ms — font-display: swaphttps://www.starbucks.com/_next/static/media/SoDoSans-Regular.fb96a065.woffSoDoSans-Regular.fb96a0... https://www.starbucks.com/_next/static/media/SoDoSans-Regular.fb96a065.woff — 36.0 KiB — 521 ms — font-display: swaphttps://www.starbucks.com/_next/static/media/SoDoSans-SemiBold.6aebdeb6.woffSoDoSans-SemiBold.6aebd... https://www.starbucks.com/_next/static/media/SoDoSans-SemiBold.6aebdeb6.woff — 37.4 KiB — 137 ms — font-display: swaphttps://consent.trustarc.com/get?name=sodosans-normal.woffget https://consent.trustarc.com/get?name=sodosans-normal.woff — 35.6 KiB — 9 ms — font-display: swap
SoDoSans-Bold.49f6eaa3.... woff swap
Size 37 KB
Load time 128 ms
Start 357 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
SoDoSans-Regular.fb96a0... woff swap
Size 36 KB
Load time 521 ms
Start 358 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
SoDoSans-SemiBold.6aebd... woff swap
Size 37 KB
Load time 137 ms
Start 444 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
get woff swap
Size 36 KB
Load time 9 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~44 KB and ~88 ms

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
57 requests over 2348ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 1.4 shttps://starbucks.com// https://starbucks.com/ — 301 — 192 B — 20 ms — h2https://www.starbucks.com/www.starbucks.com/ https://www.starbucks.com/ — 200 — 28.1 KiB — 124 ms — h2https://cdn.optimizely.com/js/13849340212.jscdn.optimizely.com/js/13849340212.j... https://cdn.optimizely.com/js/13849340212.js — 200 — 99.8 KiB — 40 ms — h2https://www.starbucks.com/_next/static/css/a238819714180add.csswww.starbucks.com/_next/static/css/... https://www.starbucks.com/_next/static/css/a238819714180add.css — 200 — 12.4 KiB — 120 ms — h2https://www.starbucks.com/_next/static/css/2106d8714ee3f9ec.csswww.starbucks.com/_next/static/css/... https://www.starbucks.com/_next/static/css/2106d8714ee3f9ec.css — 200 — 6.6 KiB — 115 ms — h2https://www.starbucks.com/_next/static/css/6d556b2302d130d1.csswww.starbucks.com/_next/static/css/... https://www.starbucks.com/_next/static/css/6d556b2302d130d1.css — 200 — 4.6 KiB — 119 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107289.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107289.jpg — 200 — 109.5 KiB — 28 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107384.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107384.jpg — 200 — 100.3 KiB — 36 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107689.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107689.jpg — 200 — 98.2 KiB — 20 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107692.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107692.jpg — 200 — 37.1 KiB — 13 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107687.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107687.jpg — 200 — 58.6 KiB — 20 ms — h2https://www.starbucks.com/manifest.jsonwww.starbucks.com/manifest.json https://www.starbucks.com/manifest.json — 200 — 1.9 KiB — 141 ms — h2https://www.starbucks.com/_next/static/chunks/webpack-a339f4a57035852b.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/webpack-a339f4a57035852b.js — 200 — 1.1 KiB — 142 ms — h2https://www.starbucks.com/_next/static/chunks/framework-4c8e7e593a0ef696.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/framework-4c8e7e593a0ef696.js — 200 — 65.2 KiB — 275 ms — h2https://www.starbucks.com/_next/static/chunks/main-c55ed56afb511107.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/main-c55ed56afb511107.js — 200 — 39.6 KiB — 157 ms — h2https://www.starbucks.com/_next/static/chunks/pages/_app-36b854eca122cc10.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/pages/_app-36b854eca122cc10.js — 200 — 4.0 KiB — 151 ms — h2https://www.starbucks.com/_next/static/chunks/8-4cb85718db2280f9.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/8-4cb85718db2280f9.js — 200 — 82.6 KiB — 205 ms — h2https://consent.trustarc.com/notice?domain=app.starbucks.com&gtm=1&ostype=mobile&pcookie&oc=1&c=teconsent&text=true&js=nj&noticeType=bb&pn=1&country=us&language=en_usconsent.trustarc.com/notice?domain=... https://consent.trustarc.com/notice?domain=app.starbucks.com&gtm=1&ostype=mobile&pcookie&oc=1&c=teconsent&text=true&js=nj&noticeType=bb&pn=1&country=us&language=en_us — 200 — 13.4 KiB — 30 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-P37KWTPwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-P37KWTP — 200 — 158.7 KiB — 37 ms — h2https://www.starbucks.com/_next/static/chunks/153-db6cf0a8a1347aa5.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/153-db6cf0a8a1347aa5.js — 200 — 30.1 KiB — 134 ms — h2https://www.starbucks.com/_next/static/chunks/pages/%5B%5B...page%5D%5D-7e1584ddbee8de10.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/pages/%5B%5B...page%5D%5D-7e1584ddbee8de10.js — 200 — 1.8 KiB — 127 ms — h2https://www.starbucks.com/_next/static/VGmoUeN71xRFRUW6v7LbN/_buildManifest.jswww.starbucks.com/_next/static/VGmo... https://www.starbucks.com/_next/static/VGmoUeN71xRFRUW6v7LbN/_buildManifest.js — 200 — 1.1 KiB — 145 ms — h2https://www.starbucks.com/_next/static/VGmoUeN71xRFRUW6v7LbN/_ssgManifest.jswww.starbucks.com/_next/static/VGmo... https://www.starbucks.com/_next/static/VGmoUeN71xRFRUW6v7LbN/_ssgManifest.js — 200 — 444 B — 129 ms — h2https://www.starbucks.com/_next/static/media/SoDoSans-Bold.49f6eaa3.woffwww.starbucks.com/_next/static/medi... https://www.starbucks.com/_next/static/media/SoDoSans-Bold.49f6eaa3.woff — 200 — 37.2 KiB — 128 ms — h2https://www.starbucks.com/_next/static/media/SoDoSans-Regular.fb96a065.woffwww.starbucks.com/_next/static/medi... https://www.starbucks.com/_next/static/media/SoDoSans-Regular.fb96a065.woff — 200 — 36.0 KiB — 521 ms — h2https://a6558036.cdn.optimizely.com/client_storage/a6558036.htmla6558036.cdn.optimizely.com/client_... https://a6558036.cdn.optimizely.com/client_storage/a6558036.html — 200 — 1.5 KiB — 49 ms — h2https://www.starbucks.com/_next/static/media/SoDoSans-SemiBold.6aebdeb6.woffwww.starbucks.com/_next/static/medi... https://www.starbucks.com/_next/static/media/SoDoSans-SemiBold.6aebdeb6.woff — 200 — 37.4 KiB — 137 ms — h2https://consent.trustarc.com/analytics?action=0&domain=app.starbucks.com&implied=1&session=0aa378f84e58454bbc1118260ef81342&new=1&referer=https://www.starbucks.comconsent.trustarc.com/analytics?acti... https://consent.trustarc.com/analytics?action=0&domain=app.starbucks.com&implied=1&session=0aa378f84e58454bbc1118260ef81342&new=1&referer=https://www.starbucks.com — 200 — 464 B — 36 ms — h2https://consent.trustarc.com/asset/notice.js/v/v1.7-1729consent.trustarc.com/asset/notice.j... https://consent.trustarc.com/asset/notice.js/v/v1.7-1729 — 200 — 36.4 KiB — 27 ms — h2https://consent.trustarc.com/get?name=crossdomain.html&domain=app.starbucks.comconsent.trustarc.com/get?name=cross... https://consent.trustarc.com/get?name=crossdomain.html&domain=app.starbucks.com — 200 — 1.4 KiB — 13 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.0 s LCP 1.4 shttps://starbucks.com// https://starbucks.com/ — 301 — 192 B — 20 ms — h2https://www.starbucks.com/www.starbucks.com/ https://www.starbucks.com/ — 200 — 28.1 KiB — 124 ms — h2https://cdn.optimizely.com/js/13849340212.jscdn.optimizely.com/js/13849340212.j... https://cdn.optimizely.com/js/13849340212.js — 200 — 99.8 KiB — 40 ms — h2https://www.starbucks.com/_next/static/css/a238819714180add.csswww.starbucks.com/_next/static/css/... https://www.starbucks.com/_next/static/css/a238819714180add.css — 200 — 12.4 KiB — 120 ms — h2https://www.starbucks.com/_next/static/css/2106d8714ee3f9ec.csswww.starbucks.com/_next/static/css/... https://www.starbucks.com/_next/static/css/2106d8714ee3f9ec.css — 200 — 6.6 KiB — 115 ms — h2https://www.starbucks.com/_next/static/css/6d556b2302d130d1.csswww.starbucks.com/_next/static/css/... https://www.starbucks.com/_next/static/css/6d556b2302d130d1.css — 200 — 4.6 KiB — 119 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107289.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107289.jpg — 200 — 109.5 KiB — 28 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107384.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107384.jpg — 200 — 100.3 KiB — 36 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107689.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107689.jpg — 200 — 98.2 KiB — 20 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107692.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107692.jpg — 200 — 37.1 KiB — 13 ms — h2https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107687.jpgcontent-prod-live.cert.starbucks.co... https://content-prod-live.cert.starbucks.com/binary/v2/asset/137-107687.jpg — 200 — 58.6 KiB — 20 ms — h2https://www.starbucks.com/manifest.jsonwww.starbucks.com/manifest.json https://www.starbucks.com/manifest.json — 200 — 1.9 KiB — 141 ms — h2https://www.starbucks.com/_next/static/chunks/webpack-a339f4a57035852b.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/webpack-a339f4a57035852b.js — 200 — 1.1 KiB — 142 ms — h2https://www.starbucks.com/_next/static/chunks/framework-4c8e7e593a0ef696.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/framework-4c8e7e593a0ef696.js — 200 — 65.2 KiB — 275 ms — h2https://www.starbucks.com/_next/static/chunks/main-c55ed56afb511107.jswww.starbucks.com/_next/static/chun... https://www.starbucks.com/_next/static/chunks/main-c55ed56afb511107.js — 200 — 39.6 KiB — 157 ms — 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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 1427ms · 676KB · $27/mo
www.starbucks.com
Other
Costly
Execution 344ms
Transfer 28 KB
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 301ms
Transfer 0 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 218ms
Transfer 159 KB
Unused 42%
Monthly Cost $4/mo
www.starbucks.com
Other
Optional
Execution 188ms
Transfer 65 KB
Unused 37%
Monthly Cost $4/mo
Optimizely
A/B Testing
Optional
Execution 151ms
Transfer 100 KB
Unused 36%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 163 KB
Unused 41%
Monthly Cost $2/mo
www.starbucks.com
Other
Optional
Execution 65ms
Transfer 2 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 160 KB
Unused 42%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.starbucks.com adds 344ms and costs ~$6/month
  • Unattributable adds 301ms and costs ~$6/month
  • Google Tag Manager adds 218ms 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.starbucks.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

Unattributable takes 301ms 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

Google Tag Manager takes 218ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

How third-party costs are calculated

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

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