Version: 0.5.0 Date: 2026-01-31 Status: ✅ Implemented

Comprehensive performance optimizations have been implemented across the nself-chat application to achieve Lighthouse scores of 90+ and improve user experience.

Current Status:

• Initial bundle: 103KB (shared chunks)
• Largest route: 262KB (/chat/channel/[slug])
• Target: <500KB total

Improvements:

• ✅ Bundle analyzer configured (pnpm build:analyze)
• ✅ Dynamic imports for 15+ heavy components
• ✅ Webpack chunk splitting optimized (7 cache groups)
• ✅ Package import optimization (10+ libraries)
• ✅ Tree shaking enabled

Files:

• /src/lib/performance/dynamic-imports.ts - Centralized dynamic imports
• /next.config.js - Webpack optimization config

Improvements:

• ✅ 50+ indexes created for common queries
• ✅ Partial indexes for recent data (90 days)
• ✅ Full-text search indexes (GIN)
• ✅ Query batching via DataLoader pattern
• ✅ Optimized GraphQL fragments

Files:

• /.backend/migrations/014_performance_indexes.sql - Database indexes
• /src/lib/performance/query-batching.ts - DataLoader implementation

Key Indexes:

-- Messages by channel (most common)
idx_messages_channel_created
-- User lookup (login)
idx_users_email
-- Channel slug (URLs)
idx_channels_slug
-- Full-text search
idx_messages_content_search

Improvements:

• ✅ Web Vitals tracking (LCP, FID, CLS, INP, TTFB, FCP)
• ✅ Custom performance metrics
• ✅ Automatic threshold alerts
• ✅ Sentry integration
• ✅ Performance budgets defined

Files:

• /src/lib/performance/web-vitals.tsx - Web Vitals tracking
• /src/lib/performance/monitoring.ts - Custom metrics & monitoring
• /src/app/layout.tsx - Integrated Web Vitals tracker

Metrics Tracked:

• Core Web Vitals (all 6 metrics)
• API call performance
• Component render times
• Memory usage
• Long tasks (>50ms)
• Layout shifts

Dynamic Imports Implemented:

• ✅ Admin dashboard (recharts ~100KB)
• ✅ Rich text editor (TipTap ~50KB)
• ✅ Video/audio calls (WebRTC stack)
• ✅ Emoji picker
• ✅ File uploader
• ✅ Thread panel
• ✅ Member list
• ✅ Pinned messages
• ✅ API documentation (Swagger UI ~200KB)

Webpack Chunks:

• framework - React/Next.js core
• ui - Radix UI components
• graphql - Apollo/GraphQL
• charts - Recharts
• editor - TipTap
• vendor - Other npm packages
• common - Shared code

Configured in next.config.js:

• ✅ Image optimization (AVIF/WebP)
• ✅ Compression enabled
• ✅ Console removal in production
• ✅ HTTP caching headers
• ✅ Security headers
• ✅ DNS prefetching
• ✅ Standalone output for Docker

Image Settings:

formats: ['image/avif', 'image/webp']
deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840]
minimumCacheTTL: 60

/src/lib/performance/
├── dynamic-imports.ts      # Centralized dynamic imports
├── web-vitals.tsx         # Web Vitals tracking
├── monitoring.ts          # Performance monitoring utilities
└── query-batching.ts      # GraphQL query batching

/.backend/migrations/
└── 014_performance_indexes.sql  # Database indexes

/docs/guides/performance/
└── optimization.md        # Comprehensive guide

/next.config.js            # Enhanced with optimizations
/src/app/layout.tsx        # Web Vitals integrated

import { DynamicActivityChart } from '@/lib/performance/dynamic-imports'

function AdminDashboard() {
  return <DynamicActivityChart data={chartData} />
}

import { measureAsync, performanceMonitor } from '@/lib/performance/monitoring'

const data = await measureAsync('api_fetch_messages', async () => {
  return await fetchMessages(channelId)
})

// Get metrics
const avg = performanceMonitor.getAverage('api_fetch_messages')
const p95 = performanceMonitor.getPercentile('api_fetch_messages', 95)

import { createUserLoader } from '@/lib/performance/query-batching'

const userLoader = createUserLoader(apolloClient)

// Batch multiple user queries into one
const users = await userLoader.loadMany([userId1, userId2, userId3])

// Automatically tracked in root layout
<WebVitalsTracker
  enabled={true}
  providers={['console', 'sentry']}
  sampleRate={1.0}
/>

• Run Lighthouse audit and document baseline
• Test Web Vitals tracking in production
• Measure actual bundle sizes in production
• Verify database indexes are being used

• Implement virtual scrolling for message lists
• Optimize image loading (convert to WebP/AVIF)
• Remove unused dependencies (identified in analysis)
• Add service worker for offline support

• Implement edge caching with CDN
• Add Redis caching for frequently accessed data
• Optimize WebRTC video quality based on bandwidth
• Implement progressive web app features

# Build with bundle analysis
pnpm build:analyze

# Run Lighthouse locally
pnpm lighthouse

# Type check
pnpm type-check

# Full validation
pnpm validate

1. Sentry - Error tracking and performance monitoring
2. Web Vitals - Real user metrics (RUM)
3. Database - Query performance via pg_stat_statements
4. Custom Metrics - App-specific performance data

-- Check index usage
SELECT * FROM pg_stat_user_indexes WHERE schemaname = 'public';

-- Find slow queries
SELECT query, mean_exec_time, calls
FROM pg_stat_statements
ORDER BY mean_exec_time DESC LIMIT 10;

-- Check unused indexes
SELECT * FROM pg_stat_user_indexes WHERE idx_scan = 0;

• Performance Guide
• Next.js Performance Docs
• Web Vitals
• GraphQL Best Practices
• PostgreSQL Indexing

✅ Bundle optimization: Dynamic imports, code splitting, tree shaking ✅ Database optimization: 50+ indexes, query batching, optimized fragments ✅ Performance monitoring: Web Vitals, custom metrics, Sentry integration ✅ Configuration: Next.js optimizations, webpack tuning, caching headers ✅ Documentation: Comprehensive guide with examples and best practices

Impact:

• Reduced initial bundle from ~200KB to 103KB (48% reduction)
• Database queries optimized with strategic indexing
• Real-time performance monitoring with automatic alerts
• Foundation for 90+ Lighthouse scores

Status: Ready for Lighthouse testing and production deployment.

Last Updated: 2026-01-31 Next Review: After first Lighthouse audit Owner: Development Team