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https://store.taylorswift.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
1
PASS
7
INFO
2

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

Mobile Desktop
51
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
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.

856 ms

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

2.18 s

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

2.06 s

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

0.009

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

2.94 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.

11.52 s

Page Load Progression

1.4 s
2.9 s
4.3 s
5.7 s
7.1 s
8.6 s
10.0 s
11.4 s
Checks
14
7 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
84.1 MB transferred, 379 requests
FIX
84.1 MB transferred, 379 requests
Critical::
Page weighs 89.7 MB (84.1 MB transferred)
Warning::
Images are 10.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 10.1 MB
Warning::
JavaScript is 2.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.2 MB
Warning::
379 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 17.6 g CO2 per page load
84.1 MB / 2.4 MB budget
84.1 MB transferred
379 requests
17.6 g CO2 per page load
Other 70.7 MiB 84%
Images 10.1 MiB 12%
JavaScript 2.2 MiB 3%
Other 851.4 KiB 1%
HTML 134.5 KiB 0%
Other 99.2 KiB 0%
CSS 38.9 KiB 0%
Fonts 25.5 KiB 0%
Other 15.1 KiB 0%
Other 8.0 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

F
JS Execution Cost
Action
11315ms total JS execution
FIX
11315ms total JS execution
Warning::
Unattributable: 3168ms CPU time
Warning::
https://store.taylorswift.com/cdn/wpm/b0e8c7c7aw41...: 1836ms CPU time
Warning::
https://store.taylorswift.com/: 1303ms CPU time
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 940ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TBD...: 465ms CPU time
Warning::
Third-party scripts: 7524ms (66% of total)

Main Thread Breakdown

Other 45% Script Evaluation 40% Script Parsing & Compilation 5% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
Unattributable3168ms172ms0ms3rd
https://store.taylorswift.com/cdn/wpm/b0e8c7c7aw41bd75a1p837d7fd4m8b145375m.js1836ms231ms6ms1st
https://store.taylorswift.com/1303ms69ms10ms1st
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js940ms814ms52ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TBDJX57V465ms427ms29ms3rd
https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js406ms265ms19ms3rd
https://www.googletagmanager.com/gtag/js?id=G-G45E6KQ5Z2&cx=c&gtm=4e6461300ms201ms99ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-747581186&cx=c&gtm=4e6461272ms217ms55ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-854631222&cx=c&gtm=4e6461266ms218ms44ms3rd
https://www.googletagmanager.com/gtag/js?id=GT-PJN84ZH263ms199ms25ms3rd

Showing top 10 of 28 scripts

F
JS Bundles
Action
151 scripts, 695 KB unused
FIX
151 scripts, 695 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-PJN...: 105 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-G45E...: 70 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-G45E...: 70 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-PJN...: 63 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TBD...: 60 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 695 KB
695 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=GT-PJN84ZH&cx=c&gtm=4e6461136 KB105 KB (77%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-G45E6KQ5Z2&cx=c&gtm=4e6461150 KB70 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-G45E6KQ5Z2&cx=c&gtm=4e6461150 KB70 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-PJN84ZH136 KB63 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TBDJX57V180 KB60 KB (33%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TBDJX57V180 KB60 KB (33%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-854631222&cx=c&gtm=4e6461136 KB58 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-747581186&cx=c&gtm=4e6461137 KB58 KB (43%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js110 KB55 KB (51%)✓3rd
https://store.taylorswift.com/cdn/shop/t/514/assets/libs.js?v=13864149752487195444177385964539 KB25 KB (66%)✓1st

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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
max-age0Cache for 0 seconds
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
post-check0
pre-check0
B
Image Optimization
96 images, 0 KB saveable
REVIEW
96 images, 0 KB saveable
Info::
All images are well-optimized
96 images 10.1 MB
0 oversized -0 KB
13 legacy format
0 missing dimensions CLS risk
A+
Third-Party Impact
4% third-party, 0 ms blocking
PASS
4% third-party, 0 ms blocking
Info::
Third-party code accounts for 4% of page weight (3.4 MiB of 84.1 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
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
1 fonts (26 KB)
PASS
1 fonts (26 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

26 KB total

Render-blocking

0

of 1

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 2.0 s FCP 856 ms LCP 2.2 shttps://use.typekit.net/af/dece30/0000000000000000774b9a94/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/dece30/0000000000000000774b9a94/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 25.5 KiB — 0 ms — font-display: swap
l woff2 swap
Size 26 KB
Load time 0 ms
Start 0 ms
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
379 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
66% of JavaScript execution is third-party
First-party Third-party 7524ms · 1326KB · $43/mo
Unattributable
Other
Costly
Execution 3168ms
Transfer 0 KB
Monthly Cost $18/mo
Hotjar
Session Replay
Costly
Execution 940ms
Transfer 57 KB
Unused 45%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 465ms
Transfer 180 KB
Unused 33%
Monthly Cost $3/mo
OneTrust
Consent
Essential
Execution 406ms
Transfer 127 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 300ms
Transfer 150 KB
Unused 47%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 272ms
Transfer 137 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 266ms
Transfer 136 KB
Unused 43%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Costly
Execution 263ms
Transfer 136 KB
Unused 47%
Monthly Cost $2/mo
analytics.tiktok.com
Other
Costly
Execution 254ms
Transfer 110 KB
Unused 51%
Monthly Cost $1/mo
d2wy8f7a9ursnm.cloudfront.net
Other
Costly
Execution 201ms
Transfer 12 KB
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 188ms
Transfer 21 KB
Monthly Cost $1/mo
sc-static.net
Other
Optional
Execution 170ms
Transfer 25 KB
Monthly Cost $1/mo
s.pinimg.com
Other
Optional
Execution 163ms
Transfer 28 KB
Monthly Cost $1/mo
jsDelivr
CDN
Optional
Execution 124ms
Transfer 16 KB
Monthly Cost $1/mo
Twitter/X Pixel
Advertising
Optional
Execution 94ms
Transfer 13 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 77ms
Transfer 136 KB
Unused 77%
Monthly Cost $0/mo
static.klaviyo.com
Other
Optional
Execution 61ms
Transfer 3 KB
Monthly Cost $0/mo
analytics.tiktok.com
Other
Optional
Execution 57ms
Transfer 40 KB
Monthly Cost $0/mo
tr.snapchat.com
Other
Optional
Execution 54ms
Transfer 0 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 3168ms and costs ~$18/month
  • Hotjar adds 940ms and costs ~$5/month
  • Google Tag Manager adds 465ms and costs ~$3/month
  • Google Tag Manager adds 300ms and costs ~$2/month
  • Google Tag Manager adds 272ms and costs ~$2/month
  • Google Tag Manager adds 266ms and costs ~$2/month
  • Google Tag Manager adds 263ms and costs ~$2/month
  • analytics.tiktok.com adds 254ms and costs ~$1/month
  • d2wy8f7a9ursnm.cloudfront.net adds 201ms and costs ~$1/month

66% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 3168ms 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

Hotjar takes 940ms 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 465ms 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 300ms 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 272ms 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 266ms 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 263ms 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

analytics.tiktok.com takes 254ms 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

51% of analytics.tiktok.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

d2wy8f7a9ursnm.cloudfront.net takes 201ms 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

77% 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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