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https://starbucks.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
31
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.

5.72 s

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

15.77 s

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

2.32 s

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

0.000

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

6.61 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.

15.77 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
17
7 PASS 3 REVIEW 5 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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5674ms total JS execution
FIX
5674ms total JS execution
Warning::
https://www.starbucks.com/_next/static/chunks/fram...: 1332ms CPU time
Warning::
Unattributable: 701ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P37...: 658ms CPU time
Warning::
https://www.starbucks.com/: 645ms CPU time
Warning::
https://cdn.optimizely.com/js/13849340212.js: 634ms CPU time
Warning::
Third-party scripts: 5674ms (100% of total)

Main Thread Breakdown

Script Evaluation 66% Script Parsing & Compilation 11% Other 11% Style & Layout 8%
ScriptTotalScriptingParse/CompileParty
https://www.starbucks.com/_next/static/chunks/framework-4c8e7e593a0ef696.js1332ms960ms40ms3rd
Unattributable701ms218ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P37KWTP658ms561ms85ms3rd
https://www.starbucks.com/645ms269ms13ms3rd
https://cdn.optimizely.com/js/13849340212.js634ms553ms67ms3rd
https://www.googletagmanager.com/gtag/js?id=G-Q8JXK1T67J&cx=c&gtm=4e64h1391ms302ms87ms3rd
https://www.starbucks.com/_next/static/chunks/pages/%5B%5B...page%5D%5D-7e1584ddbee8de10.js285ms283ms1ms3rd
https://jssdkcdns.mparticle.com/js/v2/us1-b96c10bf8d450e45a5f108932f193fc4/mparticle.js?env=0&plan_id=customer_activity_events&202ms145ms46ms3rd
https://www.googletagmanager.com/gtag/js?id=G-VMTHZW7WSM198ms109ms86ms3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-1729181ms123ms49ms3rd

Showing top 10 of 14 scripts

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/gtag/js?id=G-Q8JX...: 67 KB unused (41%)
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.starbucks.com/_next/static/chunks/8-4c...: 40 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-Q8JXK1T67J163 KB109 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-VMTHZW7WSM160 KB67 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-Q8JXK1T67J&cx=c&gtm=4e64h1163 KB67 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P37KWTP159 KB67 KB (42%)✓3rd
https://www.starbucks.com/_next/static/chunks/8-4cb85718db2280f9.js83 KB40 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 (38%)✓3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-172936 KB20 KB (57%)✓3rd
https://www.starbucks.com/_next/static/VGmoUeN71xRFRUW6v7LbN/_ssgManifest.js0 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
56 resources · 1.6 MB · 460 KB savings available
FIX
56 resources · 1.6 MB · 460 KB savings available
Warning::
Page weight 591 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~460 KB of savings available
Warning::
55 third-party resources (100% of weight)
56 resources · 1.6 MiB · 55 third-party 591.0 KiB over 1MB target
JavaScript 68% · 1.1 MiB
Image 19% · 306.4 KiB
Font 9% · 146.3 KiB
Document 2% · 31.1 KiB
CSS 1% · 23.7 KiB
Other 0% · 3.5 KiB

~459.8 KiB of savings available

Remove unused JavaScript: 459.8 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
1.6 MB transferred, 56 requests
REVIEW
1.6 MB transferred, 56 requests
Info::
Page weighs 4.2 MB (1.6 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::
56 HTTP requests
Info::
Estimated 0.33 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
56 requests
0.33 g CO2 per page load
JavaScript 1.1 MiB 68%
Images 297.7 KiB 18%
Fonts 146.3 KiB 9%
HTML 30.9 KiB 2%
CSS 23.7 KiB 1%
Other 8.0 KiB 0%
Other 2.1 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 298 KB
0 oversized -0 KB
4 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
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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 5.7 s LCP 15.8 shttps://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 — 118 ms — font-display: swaphttps://consent.trustarc.com/get?name=sodosans-normal.woffget https://consent.trustarc.com/get?name=sodosans-normal.woff — 35.6 KiB — 22 ms — font-display: swaphttps://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 — 214 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 — 108 ms — font-display: swap
SoDoSans-Regular.fb96a0... woff swap
Size 36 KB
Load time 118 ms
Start 1.2 s
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 22 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
SoDoSans-Bold.49f6eaa3.... woff swap
Size 37 KB
Load time 214 ms
Start 1.2 s
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 108 ms
Start 1.2 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
1
preload
3
dns-prefetch
—
prefetch
—

4 resource hints configured

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
56 requests over 2391ms
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 FCP 5.7 s LCP 15.8 shttps://starbucks.com// https://starbucks.com/ — 301 — 192 B — 19 ms — h2https://www.starbucks.com/www.starbucks.com/ https://www.starbucks.com/ — 200 — 28.1 KiB — 130 ms — h2https://cdn.optimizely.com/js/13849340212.jscdn.optimizely.com/js/13849340212.j... https://cdn.optimizely.com/js/13849340212.js — 200 — 99.8 KiB — 38 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 — 368 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 — 130 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 — 131 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 — 67.1 KiB — 382 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 — 69.9 KiB — 142 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 — 99.6 KiB — 178 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 — 24.9 KiB — 114 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 — 34.2 KiB — 116 ms — h2https://www.starbucks.com/manifest.jsonwww.starbucks.com/manifest.json https://www.starbucks.com/manifest.json — 200 — 1.9 KiB — 395 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 — 122 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 — 170 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 — 169 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 — 153 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 — 79 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 — 44 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 — 619 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 — 496 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 — 418 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 — 436 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 — 411 ms — h2https://consent.trustarc.com/analytics?action=0&domain=app.starbucks.com&implied=1&session=ff7502789b45406dbebbea4126e226de&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=ff7502789b45406dbebbea4126e226de&new=1&referer=https://www.starbucks.com — 200 — 465 B — 92 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 — 71 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 — 40 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 — 38 ms — h2https://www.google.com/ccm/collect?rcb=9&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.starbucks.com%2F&scrsrc=www.googletagmanager.com&rnd=180029870.1776804637&dt=Starbucks%20Coffee%20Company&auid=1708067794.1776804637&navt=n&npa=1&ep.ads_data_redaction=0&gtm=45He64h1v79670260za200zd79670260xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115616985~115938466~115938468~117266400~118463262&apve=1&apvf=f&apvc=1&tft=1776804637456&tfd=757www.google.com/ccm/collect?rcb=9&fr... https://www.google.com/ccm/collect?rcb=9&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.starbucks.com%2F&scrsrc=www.googletagmanager.com&rnd=180029870.1776804637&dt=Starbucks%20Coffee%20Company&auid=1708067794.1776804637&navt=n&npa=1&ep.ads_data_redaction=0&gtm=45He64h1v79670260za200zd79670260xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115616985~115938466~115938468~117266400~118463262&apve=1&apvf=f&apvc=1&tft=1776804637456&tfd=757 — 200 — 0 B — 25 ms — h3https://www.googletagmanager.com/gtag/js?id=G-VMTHZW7WSMwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-VMTHZW7WSM — 200 — 160.4 KiB — 34 ms — h2https://jssdkcdns.mparticle.com/js/v2/us1-b96c10bf8d450e45a5f108932f193fc4/mparticle.js?env=0&plan_id=customer_activity_events&jssdkcdns.mparticle.com/js/v2/us1-b... https://jssdkcdns.mparticle.com/js/v2/us1-b96c10bf8d450e45a5f108932f193fc4/mparticle.js?env=0&plan_id=customer_activity_events& — 200 — 66.1 KiB — 418 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 FCP 5.7 s LCP 15.8 shttps://starbucks.com// https://starbucks.com/ — 301 — 192 B — 19 ms — h2https://www.starbucks.com/www.starbucks.com/ https://www.starbucks.com/ — 200 — 28.1 KiB — 130 ms — h2https://cdn.optimizely.com/js/13849340212.jscdn.optimizely.com/js/13849340212.j... https://cdn.optimizely.com/js/13849340212.js — 200 — 99.8 KiB — 38 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 — 368 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 — 130 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 — 131 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 5674ms · 1077KB · $106/mo
www.starbucks.com
Other
Costly
Execution 1332ms
Transfer 65 KB
Unused 38%
Monthly Cost $25/mo
Unattributable
Other
Costly
Execution 701ms
Transfer 0 KB
Monthly Cost $13/mo
Google Tag Manager
Tag Manager
Costly
Execution 658ms
Transfer 159 KB
Unused 42%
Monthly Cost $12/mo
www.starbucks.com
Other
Costly
Execution 645ms
Transfer 28 KB
Monthly Cost $12/mo
Optimizely
A/B Testing
Costly
Execution 634ms
Transfer 100 KB
Unused 36%
Monthly Cost $12/mo
Google Tag Manager
Tag Manager
Costly
Execution 391ms
Transfer 163 KB
Unused 41%
Monthly Cost $7/mo
www.starbucks.com
Other
Costly
Execution 285ms
Transfer 2 KB
Monthly Cost $5/mo
jssdkcdns.mparticle.com
Other
Costly
Execution 202ms
Transfer 66 KB
Unused 44%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Optional
Execution 198ms
Transfer 160 KB
Unused 42%
Monthly Cost $4/mo
consent.trustarc.com
Other
Optional
Execution 181ms
Transfer 36 KB
Unused 57%
Monthly Cost $3/mo
www.starbucks.com
Other
Optional
Execution 160ms
Transfer 40 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 117ms
Transfer 163 KB
Unused 67%
Monthly Cost $2/mo
consent.trustarc.com
Other
Optional
Execution 108ms
Transfer 13 KB
Monthly Cost $2/mo
www.starbucks.com
Other
Optional
Execution 61ms
Transfer 83 KB
Unused 48%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.starbucks.com adds 1332ms and costs ~$25/month
  • Unattributable adds 701ms and costs ~$13/month
  • Google Tag Manager adds 658ms and costs ~$12/month
  • www.starbucks.com adds 645ms and costs ~$12/month
  • Optimizely adds 634ms and costs ~$12/month
  • Google Tag Manager adds 391ms and costs ~$7/month
  • www.starbucks.com adds 285ms and costs ~$5/month
  • jssdkcdns.mparticle.com adds 202ms 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 1332ms 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 701ms 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 658ms 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.starbucks.com takes 645ms 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

Optimizely takes 634ms 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 391ms 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.starbucks.com takes 285ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

jssdkcdns.mparticle.com takes 202ms 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

57% of consent.trustarc.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

67% of Google Tag Manager'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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