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.
3.36 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.76 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
74 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.041
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.36 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.
10.28 s
Page Load Progression
FPage Weight BudgetAction12.2 MB transferred, 38 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction38 resources · 12.2 MB · 50 KB savings availableFIX
~50.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 38 resources | 12.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CJS Execution CostAction1553ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 577ms | 15ms | 0ms | 3rd |
| https://blinklabs.xyz/ | 338ms | 8ms | 13ms | 3rd |
| https://blinklabs.xyz/_next/static/chunks/1517-9a766a5f1e232c4e.js | 311ms | 280ms | 20ms | 3rd |
| https://blinklabs.xyz/_next/static/chunks/4bd1b696-b537b0489da1603b.js | 238ms | 212ms | 16ms | 3rd |
| https://blinklabs.xyz/_next/static/chunks/2022-467803350af81186.js | 90ms | 58ms | 13ms | 3rd |
BJS Bundles17 scripts, 50 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://blinklabs.xyz/_next/static/chunks/2022-467803350af81186.js | 38 KB | 27 KB (72%) | ✓ | 3rd |
| https://blinklabs.xyz/_next/static/chunks/1517-9a766a5f1e232c4e.js | 51 KB | 24 KB (47%) | ✓ | 3rd |
| https://blinklabs.xyz/_next/static/chunks/3232-c4f926ed9a8e2fa6.js | 11 KB | — | ✓ | 3rd |
| https://blinklabs.xyz/_next/static/chunks/app/layout-8ece069f57cf698f.js | 7 KB | — | ✓ | 3rd |
| https://blinklabs.xyz/_next/static/chunks/main-app-99e3f7a94b31be24.js | 1 KB | — | ✓ | 3rd |
| https://blinklabs.xyz/_next/static/chunks/8173-0aecdb312eb56a26.js | 4 KB | — | ✓ | 3rd |
| https://blinklabs.xyz/_next/static/chunks/7970-98b4af5fe994f2c1.js | 6 KB | — | ✓ | 3rd |
| https://blinklabs.xyz/_next/static/chunks/6785-39a889fe641e0db9.js | 8 KB | — | ✓ | 3rd |
| https://plausible.io/js/script.js | 2 KB | — | ✓ | 3rd |
| https://blinklabs.xyz/_next/static/chunks/4bd1b696-b537b0489da1603b.js | 52 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
A+Text CompressionAll text resources are compressedPASS
AImage Optimization3 images, 0 KB saveablePASS
A+Font Loading2 fonts (140 KB)PASS
Web fonts
2
140 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- 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 ~42 KB and ~84 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints3 hints, 0 missing preconnectsPASS
Current Resource Hints
3 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall38 requests over 1035msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 577ms | 0 KB | — | €6/mo | Costly |
blinklabs.xyz blinklabs.xyz | Other | 338ms | 15 KB | — | €4/mo | Costly |
blinklabs.xyz blinklabs.xyz | Other | 311ms | 51 KB | 47% | €3/mo | Costly |
blinklabs.xyz blinklabs.xyz | Other | 238ms | 52 KB | — | €3/mo | Costly |
blinklabs.xyz blinklabs.xyz | Other | 90ms | 38 KB | 72% | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 577ms and costs ~€6/month
- blinklabs.xyz adds 338ms and costs ~€4/month
- blinklabs.xyz adds 311ms and costs ~€3/month
- blinklabs.xyz adds 238ms and costs ~€3/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
Unattributable takes 577ms 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
blinklabs.xyz takes 338ms 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
blinklabs.xyz 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
blinklabs.xyz takes 238ms 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
72% of blinklabs.xyz'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