Performance
· 17 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.
12.13 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.24 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
995 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.
12.13 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.
15.26 s
Page Load Progression
DPage Weight BudgetAction2.2 MB transferred, 83 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4326ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/boot.bundle.js?_=20260407163312 | 1486ms | 504ms | 861ms | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/a5c942f708c3877bb47f.chunk.js | 634ms | 550ms | 79ms | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/311560126c18109637e0.chunk.js | 548ms | 377ms | 169ms | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/730ba7cbc860e97fa52a.chunk.js | 426ms | 170ms | 7ms | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/13a4e417aaf663bcae37.chunk.js | 386ms | 381ms | 1ms | 3rd |
| Unattributable | 311ms | 16ms | 0ms | 3rd |
| https://www.band.us/home | 268ms | 11ms | 3ms | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/static/band-web/lottie-web-5.12.2.min.js | 152ms | 109ms | 27ms | 3rd |
| https://auth.band.us/s/login/getKey?_t=1776889046793&callback=authCallBack_1776889046793&_=1776889046703 | 115ms | 113ms | 0ms | 3rd |
FJS BundlesAction36 scripts, 1.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/boot.bundle.js?_=20260407163312 | 831 KB | 503 KB (61%) | ✓ | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/boot.bundle.js?_=20260407163312 | 0 KB | 503 KB (61%) | ✓ | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/311560126c18109637e0.chunk.js | 328 KB | 202 KB (61%) | ✓ | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/static/band-web/lottie-web-5.12.2.min.js | 75 KB | 45 KB (61%) | ✓ | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/c34860040b4a164cc08d.chunk.js | 35 KB | 21 KB (59%) | ✓ | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/c34860040b4a164cc08d.chunk.js | 0 KB | 21 KB (59%) | ✓ | 3rd |
| https://ssl.pstatic.net/cmstatic/auth/js/a0eaa49907bbf5490733543ea80f439a82f6adc6/bandRecaptchar.js | 1 KB | — | ✓ | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/a5c942f708c3877bb47f.chunk.js | 0 KB | — | ✓ | 3rd |
| https://auth.band.us/s/login/getKey?_t=1776889046793&callback=authCallBack_1776889046793&_=1776889046703 | 3 KB | — | ✓ | 3rd |
| https://ssl.pstatic.net/cmstatic/webclient/band-web/script/20260407163312/e6607c80294c1a704f0e.chunk.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 InventoryAction83 resources · 2.2 MB · 1.3 MB savings availableFIX
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 83 resources | 2.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction31 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
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
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 Loading1 fonts (71 KB)PASS
Web fonts
1
71 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~21 KB and ~42 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall83 requests over 5186msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
ssl.pstatic.net ssl.pstatic.net | Other | 1486ms | 0 KB | 61% | $20/mo | Costly |
ssl.pstatic.net ssl.pstatic.net | Other | 634ms | 0 KB | — | $8/mo | Costly |
ssl.pstatic.net ssl.pstatic.net | Other | 548ms | 328 KB | 61% | $7/mo | Costly |
ssl.pstatic.net ssl.pstatic.net | Other | 426ms | 14 KB | — | $6/mo | Costly |
ssl.pstatic.net ssl.pstatic.net | Other | 386ms | 0 KB | — | $5/mo | Costly |
Unattributable Unattributable | Other | 311ms | 0 KB | — | $4/mo | Costly |
www.band.us www.band.us | Other | 268ms | 3 KB | — | $4/mo | Costly |
ssl.pstatic.net ssl.pstatic.net | Other | 152ms | 75 KB | 61% | $2/mo | Optional |
auth.band.us auth.band.us | Other | 115ms | 3 KB | — | $2/mo | Optional |
These scripts may cost more than they're worth
- ssl.pstatic.net adds 1486ms and costs ~$20/month
- ssl.pstatic.net adds 634ms and costs ~$8/month
- ssl.pstatic.net adds 548ms and costs ~$7/month
- ssl.pstatic.net adds 426ms and costs ~$6/month
- ssl.pstatic.net adds 386ms and costs ~$5/month
- Unattributable adds 311ms and costs ~$4/month
- www.band.us adds 268ms 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
ssl.pstatic.net takes 1486ms 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
61% of ssl.pstatic.net'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
ssl.pstatic.net takes 634ms 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
ssl.pstatic.net takes 548ms 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
61% of ssl.pstatic.net'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
ssl.pstatic.net takes 426ms 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
ssl.pstatic.net takes 386ms 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
Unattributable takes 311ms 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
www.band.us takes 268ms 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
61% of ssl.pstatic.net'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