Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
842 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.47 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
161 ms
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.
2.31 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.
3.47 s
Page Load Progression
DPage Weight BudgetAction2.3 MB transferred, 106 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS BundlesAction44 scripts, 470 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://web-cdn.pandora.com/web-client-assets/web-vendor.2d3faa7f06a4f48aae5f.js | 343 KB | 145 KB (42%) | ✓ | 3rd |
| https://web-cdn.pandora.com/web-client-assets/web-app.531987748f16c121508d.js | 287 KB | 124 KB (43%) | ✓ | 3rd |
| https://web-cdn.pandora.com/web-client-assets/web-commons.76f2342d7994562ecd18.js | 88 KB | 71 KB (81%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202508.1.0/otBannerSdk.js | 120 KB | 63 KB (52%) | ✓ | 3rd |
| https://web-cdn.pandora.com/web-client-assets/d_payments.61f4dd1bb105f274a280.js | 72 KB | 35 KB (50%) | ✓ | 3rd |
| https://client.px-cloud.net/PXXljWHHUe/main.min.js | 91 KB | 31 KB (34%) | ✓ | 3rd |
| https://web-cdn.pandora.com/web-client-assets/d_collection~d_search-t3.e1fd1399bd9804b420d6.js | 2 KB | — | ✓ | 3rd |
| https://web-cdn.pandora.com/web-client-assets/d_com.88c86518235c588d0d1a.js | 2 KB | — | ✓ | 3rd |
| https://web-cdn.pandora.com/web-client-assets/polyfill.1143ed38249244ad607f.js | 2 KB | — | ✓ | 3rd |
| https://web-cdn.pandora.com/web-client-assets/smart_launch_hooks_android.043255244b06c65e391f.js | 1 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction106 resources · 2.3 MB · 470 KB savings availableFIX
~469.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 106 resources | 2.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction14 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS Execution CostAction1142ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://web-cdn.pandora.com/web-client-assets/web-vendor.2d3faa7f06a4f48aae5f.js | 306ms | 223ms | 38ms | 3rd |
| https://web-cdn.pandora.com/web-client-assets/web-app.531987748f16c121508d.js | 185ms | 152ms | 32ms | 3rd |
| https://client.px-cloud.net/PXXljWHHUe/main.min.js | 164ms | 149ms | 8ms | 3rd |
| Unattributable | 155ms | 26ms | 0ms | 3rd |
| https://web-cdn.pandora.com/web-client-assets/media-element-harness.252247263ebd155936ab.js | 97ms | 95ms | 1ms | 3rd |
| https://www.pandora.com/ | 86ms | 12ms | 3ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202508.1.0/otBannerSdk.js | 84ms | 50ms | 16ms | 3rd |
| https://web-cdn.pandora.com/web-client-assets/c_onboarding.d033dd55631a54b7efd4.js | 65ms | 47ms | 1ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font LoadingNo web fonts (system fonts)PASS
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall106 requests over 2883msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
web-cdn.pandora.com web-cdn.pandora.com | Other | 306ms | 343 KB | 42% | $4/mo | Costly |
web-cdn.pandora.com web-cdn.pandora.com | Other | 185ms | 287 KB | 43% | $2/mo | Optional |
client.px-cloud.net client.px-cloud.net | Other | 164ms | 91 KB | 34% | $2/mo | Optional |
Unattributable Unattributable | Other | 155ms | 0 KB | — | $2/mo | Optional |
web-cdn.pandora.com web-cdn.pandora.com | Other | 97ms | 12 KB | — | $1/mo | Optional |
www.pandora.com www.pandora.com | Other | 86ms | 14 KB | — | $1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 84ms | 120 KB | 52% | $1/mo | Essential |
web-cdn.pandora.com web-cdn.pandora.com | Other | 65ms | 8 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- web-cdn.pandora.com adds 306ms and costs ~$4/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
web-cdn.pandora.com takes 306ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
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.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev