Skip to content
https://store.taylorswift.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
39
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.

2.69 s

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

4.03 s

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

26.81 s

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

0.163

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

7.44 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.

50.42 s

Page Load Progression

1.5 s
3.0 s
4.5 s
6.0 s
7.5 s
8.9 s
10.4 s
11.9 s
Checks
16
9 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
78.5 MB transferred, 411 requests
FIX
78.5 MB transferred, 411 requests
Critical::
Page weighs 84.0 MB (78.5 MB transferred)
Warning::
Images are 4.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.3 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::
411 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 16.5 g CO2 per page load
78.5 MB / 2.4 MB budget
78.5 MB transferred
411 requests
16.5 g CO2 per page load
Other 70.7 MiB 90%
Images 4.3 MiB 6%
JavaScript 2.2 MiB 3%
Other 910.1 KiB 1%
HTML 134.4 KiB 0%
Other 99.2 KiB 0%
CSS 38.9 KiB 0%
Fonts 25.5 KiB 0%
Other 15.3 KiB 0%
Other 8.2 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
65223ms total JS execution
FIX
65223ms total JS execution
Warning::
https://store.taylorswift.com/: 23442ms CPU time
Warning::
Unattributable: 17479ms CPU time
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 3659ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TBD...: 3086ms CPU time
Warning::
https://cdn.cookielaw.org/scripttemplates/202601.1...: 2109ms CPU time
Warning::
Third-party scripts: 35904ms (55% of total)

Main Thread Breakdown

Other 58% Script Evaluation 29% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://store.taylorswift.com/23442ms264ms36ms1st
Unattributable17479ms991ms0ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js3659ms3145ms111ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TBDJX57V3086ms2622ms76ms3rd
https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js2109ms1209ms321ms3rd
https://store.taylorswift.com/cdn/wpm/b0e8c7c7aw41bd75a1p837d7fd4m8b145375m.js1339ms673ms43ms1st
https://store.taylorswift.com/cdn/shop/t/514/assets/libs.js?v=1386414975248719544417738596451325ms474ms21ms1st
https://www.googletagmanager.com/gtag/js?id=G-G45E6KQ5Z2&cx=c&gtm=4e6461h11022ms696ms319ms3rd
https://www.googletagmanager.com/gtag/js?id=GT-PJN84ZH1005ms862ms67ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-747581186&cx=c&gtm=4e6461h1886ms772ms106ms3rd

Showing top 10 of 45 scripts

F
JS Bundles
Action
152 scripts, 758 KB unused
FIX
152 scripts, 758 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://cdn.cookielaw.org/scripttemplates/202601.1...: 66 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202601.1...: 66 KB unused (52%)
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.
Info::
Total unused JavaScript: 758 KB
758 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=GT-PJN84ZH&cx=c&gtm=4e6461h1136 KB105 KB (77%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-G45E6KQ5Z2&cx=c&gtm=4e6461h1150 KB70 KB (47%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js127 KB66 KB (52%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202601.1.0/otBannerSdk.js127 KB66 KB (52%)✓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=4e6461h1136 KB59 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=AW-747581186&cx=c&gtm=4e6461h1137 KB58 KB (42%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js110 KB56 KB (51%)✓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

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
106 images, 0 KB saveable
REVIEW
106 images, 0 KB saveable
Info::
All images are well-optimized
106 images 4.3 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 78.5 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 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.7 s LCP 4.0 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
3
preload
—
dns-prefetch
1
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
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
411 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
55% of JavaScript execution is third-party
First-party Third-party 35904ms · 1382KB · $206/mo
Unattributable
Other
Costly
Execution 17479ms
Transfer 0 KB
Monthly Cost $100/mo
Hotjar
Session Replay
Costly
Execution 3659ms
Transfer 57 KB
Unused 45%
Monthly Cost $21/mo
Google Tag Manager
Tag Manager
Costly
Execution 3086ms
Transfer 180 KB
Unused 33%
Monthly Cost $18/mo
OneTrust
Consent
Essential
Execution 2109ms
Transfer 127 KB
Unused 52%
Monthly Cost $12/mo
Google Tag Manager
Tag Manager
Costly
Execution 1022ms
Transfer 150 KB
Unused 47%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 1005ms
Transfer 136 KB
Unused 47%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 886ms
Transfer 137 KB
Unused 42%
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 874ms
Transfer 136 KB
Unused 43%
Monthly Cost $5/mo
analytics.tiktok.com
Other
Costly
Execution 599ms
Transfer 40 KB
Monthly Cost $3/mo
analytics.tiktok.com
Other
Costly
Execution 547ms
Transfer 110 KB
Unused 51%
Monthly Cost $3/mo
d2wy8f7a9ursnm.cloudfront.net
Other
Costly
Execution 542ms
Transfer 12 KB
Monthly Cost $3/mo
s.pinimg.com
Other
Costly
Execution 495ms
Transfer 27 KB
Monthly Cost $3/mo
jsDelivr
CDN
Costly
Execution 460ms
Transfer 16 KB
Monthly Cost $3/mo
Google Analytics
Analytics
Costly
Execution 426ms
Transfer 1 KB
Monthly Cost $2/mo
sc-static.net
Other
Costly
Execution 424ms
Transfer 25 KB
Monthly Cost $2/mo
Twitter/X Pixel
Advertising
Costly
Execution 384ms
Transfer 13 KB
Monthly Cost $2/mo
Google Analytics
Analytics
Costly
Execution 313ms
Transfer 21 KB
Monthly Cost $2/mo
static.klaviyo.com
Other
Costly
Execution 289ms
Transfer 23 KB
Monthly Cost $2/mo
static-tracking.klaviyo.com
Other
Costly
Execution 239ms
Transfer 14 KB
Monthly Cost $1/mo
staticcloud.linkfire.com
Other
Costly
Execution 224ms
Transfer 4 KB
Monthly Cost $1/mo
static.klaviyo.com
Other
Optional
Execution 179ms
Transfer 2 KB
Monthly Cost $1/mo
Google Ads
Advertising
Optional
Execution 165ms
Transfer 2 KB
Monthly Cost $1/mo
Pinterest Tag
Advertising
Optional
Execution 157ms
Transfer 1 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 111ms
Transfer 136 KB
Unused 77%
Monthly Cost $1/mo
tr.snapchat.com
Other
Optional
Execution 82ms
Transfer 0 KB
Monthly Cost $0/mo
OneTrust
Consent
Essential
Execution 81ms
Transfer 9 KB
Monthly Cost $0/mo
Pinterest Tag
Advertising
Optional
Execution 69ms
Transfer 4 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 17479ms and costs ~$100/month
  • Hotjar adds 3659ms and costs ~$21/month
  • Google Tag Manager adds 3086ms and costs ~$18/month
  • Google Tag Manager adds 1022ms and costs ~$6/month
  • Google Tag Manager adds 1005ms and costs ~$6/month
  • Google Tag Manager adds 886ms and costs ~$5/month
  • Google Tag Manager adds 874ms and costs ~$5/month
  • analytics.tiktok.com adds 599ms and costs ~$3/month
  • analytics.tiktok.com adds 547ms and costs ~$3/month
  • d2wy8f7a9ursnm.cloudfront.net adds 542ms and costs ~$3/month
  • s.pinimg.com adds 495ms and costs ~$3/month
  • jsDelivr adds 460ms and costs ~$3/month
  • Google Analytics adds 426ms and costs ~$2/month
  • sc-static.net adds 424ms and costs ~$2/month
  • Twitter/X Pixel adds 384ms and costs ~$2/month
  • Google Analytics adds 313ms and costs ~$2/month
  • static.klaviyo.com adds 289ms and costs ~$2/month
  • static-tracking.klaviyo.com adds 239ms and costs ~$1/month
  • staticcloud.linkfire.com adds 224ms and costs ~$1/month

55% 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 17479ms 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 3659ms 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 3086ms 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

52% of OneTrust'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

Google Tag Manager takes 1022ms 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 1005ms 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 886ms 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 874ms 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 599ms 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 547ms 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 542ms 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

s.pinimg.com takes 495ms 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

jsDelivr takes 460ms 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 Analytics takes 426ms 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

sc-static.net takes 424ms 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

Twitter/X Pixel takes 384ms 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 Analytics takes 313ms 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

static.klaviyo.com takes 289ms 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

static-tracking.klaviyo.com takes 239ms 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

staticcloud.linkfire.com takes 224ms 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.

Send Feedback