Performance

STX is built for speed and provides comprehensive performance optimization features. This page covers all performance capabilities and optimization strategies available in the STX ecosystem.

Runtime Performance

Fast Template Compilation

STX compiles templates to highly optimized JavaScript:

typescript

// Compile-time optimization
const template = compile(`
  @foreach(items as item)
    <div class="item">{{ item.name }}</div>
  @endforeach
`)

// Generates optimized code
function render(context) {
  let html = ''
  for (const item of context.items) {
    html += `<div class="item">${escape(item.name)}</div>`
  }
  return html
}

Efficient Rendering

typescript

// Streaming rendering for large datasets
import { renderStream } from '@stx/core'

const stream = renderStream(template, {
  items: largeDataset,
  chunkSize: 100
})

// Progressive rendering
stream.on('chunk', (html) => {
  response.write(html)
})

Memory Management

typescript

// Automatic memory pooling
const pool = createTemplatePool({
  maxSize: 1000,
  ttl: 300000 // 5 minutes
})

// Efficient component recycling
const component = pool.get('Button')
component.render(props)
pool.release(component)

Build-time Optimization

Code Splitting

typescript

// Automatic route-based splitting
const routes = [
  {
    path: '/dashboard',
    component: () => import('./Dashboard.stx')
  },
  {
    path: '/profile',
    component: () => import('./Profile.stx')
  }
]

// Component-level splitting
const HeavyComponent = lazy(() => import('./HeavyComponent.stx'))

Tree Shaking

typescript

// Dead code elimination
import { render } from '@stx/core' // Only imports what's used
import { component } from '@stx/components' // Tree-shaken automatically

// Bundle analysis
bun run build:analyze

Asset Optimization

typescript

// Image optimization
const optimizedImage = `
  <img 
    src="{{ image.src }}"
    srcset="{{ image.srcset }}"
    sizes="(max-width: 768px) 100vw, 50vw"
    loading="lazy"
    decoding="async"
  />
`

// CSS optimization
const styles = css`
  .button {
    /* Critical CSS inlined */
    display: inline-block;
    padding: 8px 16px;
  }
`

Caching Strategies

Template Caching

typescript

// In-memory template caching
const cache = createCache({
  strategy: 'lru',
  maxSize: 10000,
  ttl: 3600000 // 1 hour
})

// Redis-based distributed caching
const distributedCache = createRedisCache({
  host: 'redis.example.com',
  keyPrefix: 'stx:templates:'
})

Component Caching

typescript

// Memoized components
const MemoizedCard = memo(Card, {
  shouldUpdate: (prevProps, nextProps) => {
    return prevProps.data.id !== nextProps.data.id
  }
})

// Cache by props
@cache({ 
  key: (props) => `user-${props.userId}`,
  ttl: 300 // 5 minutes
})
function UserProfile({ userId }) {
  // Expensive computation
  const user = await fetchUserData(userId)
  return render(userTemplate, { user })
}

HTTP Caching

typescript

// Cache headers optimization
app.use(cacheHeaders({
  '/static': { maxAge: 31536000 }, // 1 year
  '/api': { maxAge: 300 }, // 5 minutes
  '/': { maxAge: 0, mustRevalidate: true }
}))

// CDN optimization
const cdnConfig = {
  enabled: true,
  provider: 'cloudflare',
  purgeOnDeploy: true,
  headers: {
    'Cache-Control': 'public, max-age=31536000',
    'CDN-Cache-Control': 'public, max-age=86400'
  }
}

Database Performance

Query Optimization

typescript

// Efficient data loading
const users = await db.users
  .select(['id', 'name', 'email']) // Only select needed fields
  .where('active', true)
  .limit(100)
  .offset(page * 100)

// N+1 query prevention
const usersWithPosts = await db.users
  .with('posts') // Eager loading
  .where('active', true)

Connection Pooling

typescript

// Database connection pool
const pool = createPool({
  host: 'localhost',
  database: 'stx_app',
  user: 'stx_user',
  password: process.env.DB_PASSWORD,
  min: 2,
  max: 10,
  idleTimeoutMillis: 30000
})

Frontend Performance

Client-side Optimization

typescript

// Preload critical resources
preload('/api/user', { as: 'fetch' })
preload('/fonts/inter.woff2', { as: 'font', type: 'font/woff2' })

// Intersection Observer for lazy loading
const observer = new IntersectionObserver((entries) => {
  entries.forEach(entry => {
    if (entry.isIntersecting) {
      loadComponent(entry.target)
      observer.unobserve(entry.target)
    }
  })
})

Bundle Optimization

typescript

// Webpack bundle optimization
export default {
  optimization: {
    splitChunks: {
      chunks: 'all',
      cacheGroups: {
        vendor: {
          test: /[\\/]node_modules[\\/]/,
          name: 'vendors',
          chunks: 'all'
        },
        common: {
          name: 'common',
          minChunks: 2,
          chunks: 'all'
        }
      }
    }
  }
}

Performance Monitoring

Core Web Vitals

typescript

// Track performance metrics
import { performanceMonitor } from '@stx/monitoring'

performanceMonitor.track({
  // Largest Contentful Paint
  onLCP: (metric) => {
    analytics.track('LCP', { value: metric.value })
  },
  
  // First Input Delay
  onFID: (metric) => {
    analytics.track('FID', { value: metric.value })
  },
  
  // Cumulative Layout Shift
  onCLS: (metric) => {
    analytics.track('CLS', { value: metric.value })
  }
})

Custom Performance Metrics

typescript

// Custom timing measurements
const renderTimer = performance.mark('render-start')
await renderComponent()
performance.mark('render-end')
performance.measure('component-render', 'render-start', 'render-end')

// Memory usage tracking
const memoryUsage = performance.memory
analytics.track('memory-usage', {
  used: memoryUsage.usedJSHeapSize,
  total: memoryUsage.totalJSHeapSize
})

Performance Testing

Load Testing

typescript

// Artillery load testing
export default {
  config: {
    target: 'http://localhost:3000',
    phases: [
      { duration: 60, arrivalRate: 10 },
      { duration: 120, arrivalRate: 50 },
      { duration: 60, arrivalRate: 100 }
    ]
  },
  scenarios: [
    {
      name: 'Homepage load test',
      requests: [
        { get: { url: '/' } },
        { get: { url: '/api/users' } }
      ]
    }
  ]
}

Benchmarking

typescript

// Performance benchmarks
import { benchmark } from '@stx/testing'

benchmark('template rendering', async () => {
  const html = render(complexTemplate, largeDataset)
  return html
}, {
  iterations: 1000,
  warmup: 100
})

benchmark('component mounting', async () => {
  const component = new Component(props)
  await component.mount()
  component.unmount()
}, {
  iterations: 500
})

Advanced Optimization

Service Workers

typescript

// Service worker for caching
self.addEventListener('fetch', (event) => {
  if (event.request.url.includes('/api/')) {
    event.respondWith(
      caches.open('api-cache').then(cache => {
        return cache.match(event.request).then(response => {
          if (response) {
            // Serve from cache
            fetch(event.request).then(fetchResponse => {
              cache.put(event.request, fetchResponse.clone())
            })
            return response
          }
          
          // Fetch and cache
          return fetch(event.request).then(fetchResponse => {
            cache.put(event.request, fetchResponse.clone())
            return fetchResponse
          })
        })
      })
    )
  }
})

Edge Computing

typescript

// Edge function optimization
export default {
  runtime: 'edge',
  regions: ['iad1', 'sfo1'],
  cache: {
    maxAge: 3600,
    staleWhileRevalidate: 86400
  }
}

// Geographic content delivery
const userLocation = request.geo.country
const localizedContent = await getLocalizedContent(userLocation)

Best Practices

Code Optimization

typescript

// Efficient loops
// ❌ Slow
for (let i = 0; i < items.length; i++) {
  processItem(items[i])
}

// ✅ Fast
const length = items.length
for (let i = 0; i < length; i++) {
  processItem(items[i])
}

// ✅ Even faster for simple operations
items.forEach(processItem)

Memory Optimization

typescript

// Object pooling
const objectPool = {
  objects: [],
  get() {
    return this.objects.pop() || {}
  },
  release(obj) {
    // Clear object properties
    Object.keys(obj).forEach(key => delete obj[key])
    this.objects.push(obj)
  }
}

Performance Guide - Comprehensive performance guide
Build Guide - Build optimization strategies
Monitoring Guide - Performance monitoring setup
Deployment Guide - Production performance optimization

Performance ​

Runtime Performance ​

Fast Template Compilation ​

Efficient Rendering ​

Memory Management ​

Build-time Optimization ​

Code Splitting ​

Tree Shaking ​

Asset Optimization ​

Caching Strategies ​

Template Caching ​

Component Caching ​

HTTP Caching ​

Database Performance ​

Query Optimization ​

Connection Pooling ​

Frontend Performance ​

Client-side Optimization ​

Bundle Optimization ​

Performance Monitoring ​

Core Web Vitals ​

Custom Performance Metrics ​

Performance Testing ​

Load Testing ​

Benchmarking ​

Advanced Optimization ​

Service Workers ​

Edge Computing ​

Best Practices ​

Code Optimization ​

Memory Optimization ​

Related Resources ​

Performance

Runtime Performance

Fast Template Compilation

Efficient Rendering

Memory Management

Build-time Optimization

Code Splitting

Tree Shaking

Asset Optimization

Caching Strategies

Template Caching

Component Caching

HTTP Caching

Database Performance

Query Optimization

Connection Pooling

Frontend Performance

Client-side Optimization

Bundle Optimization

Performance Monitoring

Core Web Vitals

Custom Performance Metrics

Performance Testing

Load Testing

Benchmarking

Advanced Optimization

Service Workers

Edge Computing

Best Practices

Code Optimization

Memory Optimization

Related Resources