Performance
· 21 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.
343 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
760 ms
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
78 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.
343 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
849 ms
Page Load Progression
DJS BundlesAction28 scripts, 404 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://slacker-qdqs.vercel.app/_next/static/chunks/07tzi-w2h7_se.js | 149 KB | 109 KB (73%) | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/07tzi-w2h7_se.js | 0 KB | 109 KB (73%) | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/1h6fs7g38kcoa.js | 0 KB | 38 KB (100%) | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/1h6fs7g38kcoa.js | 39 KB | 38 KB (100%) | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/090clv82waj0s.js | 72 KB | 30 KB (42%) | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/090clv82waj0s.js | 0 KB | 30 KB (42%) | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/1mo3mg7no8wgo.js | 45 KB | 25 KB (55%) | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/1mo3mg7no8wgo.js | 0 KB | 25 KB (55%) | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/2gxz_t3vigp_a.js | 0 KB | — | ✓ | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/2ucxa66gp0jy_.js | 4 KB | — | ✓ | 1st |
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
BJS Execution Cost644ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://slacker-qdqs.vercel.app/_next/static/chunks/090clv82waj0s.js | 244ms | 214ms | 27ms | 1st |
| Unattributable | 137ms | 2ms | 0ms | 1st |
| https://slacker-qdqs.vercel.app/ | 114ms | 101ms | 4ms | 1st |
| https://slacker-qdqs.vercel.app/_next/static/chunks/222tl8s80ck2d.js | 83ms | 82ms | 1ms | 1st |
| https://slacker-qdqs.vercel.app/sign-in | 66ms | 0ms | 1ms | 1st |
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingpublic, max-age=0, must-revalidateREVIEW
public, max-age=0, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 0 | Cache for 0 seconds |
| must-revalidate | — | Must recheck with server after expiry |
APage Weight Budget945 KB transferred, 37 requestsPASS
A+Third-Party ImpactNo third-party resourcesPASS
A+Text CompressionAll text resources are compressedPASS
A+Image OptimizationNo images on this pagePASS
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
A+Document CompressionDocument response uses brotliPASS
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML max-age=0 (≤ 5min) is appropriatePASS
A+Server Response Intelligence2 server-response signal(s) detectedPASS
APage Weight Inventory37 resources · 945 KB · 404 KB savings availablePASS
~403.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 37 resources | 945.0 KiB | ||||||