Performance Optimization

Maximize PCU performance for large monorepos, complex workspaces, and resource-constrained environments.

Understanding PCU Performance

PCU performance depends on several factors:

Network latency: Registry response times and bandwidth
Workspace size: Number of packages and dependencies
Cache efficiency: Hit rates and storage optimization
System resources: CPU, memory, and disk I/O
Configuration: Concurrency settings and timeout values

Performance Profiling

Enable detailed performance monitoring:

# Enable performance profiling
export PCU_PROFILE=true
export DEBUG=pcu:performance,pcu:network,pcu:cache

# Run with timing information
time pcu check --verbose

Sample Output Analysis:

Dependency analysis: 2.3s
Network requests: 4.1s (45 requests)
Cache operations: 0.8s (12 hits, 33 misses)
File I/O: 1.2s
Total execution: 8.4s

Configuration Optimization

Concurrency Settings

Optimize concurrent operations for your environment:

{
  "concurrency": 3,
  "timeout": 45000,
  "advanced": {
    "batchSize": 8,
    "maxRetries": 2,
    "retryDelay": 1000
  }
}

Concurrency Guidelines:

Small projects (under 20 packages): concurrency: 5-8
Medium projects (20-100 packages): concurrency: 3-5
Large projects (over 100 packages): concurrency: 1-3
CI/CD environments: concurrency: 2-3

Memory Management

Node.js Memory Optimization:

# Increase heap size for large monorepos
export NODE_OPTIONS="--max-old-space-size=4096"

# Enable garbage collection optimization
export NODE_OPTIONS="--max-old-space-size=4096 --optimize-for-size"

# For extremely large workspaces
export NODE_OPTIONS="--max-old-space-size=8192 --max-semi-space-size=128"

PCU Memory Configuration:

{
  "advanced": {
    "memoryOptimization": true,
    "maxConcurrentAnalysis": 10,
    "streamProcessing": true,
    "gcInterval": 1000
  }
}

Caching Strategies

Local Cache Optimization

Cache Configuration:

{
  "cache": {
    "enabled": true,
    "ttl": 3600,
    "maxSize": 500,
    "compression": true,
    "strategy": "lru"
  }
}

Environment Variables:

# Enable persistent caching
export PCU_CACHE_ENABLED=true
export PCU_CACHE_DIR="~/.pcu-cache"
export PCU_CACHE_TTL=7200  # 2 hours
export PCU_CACHE_MAX_SIZE=1000  # 1GB

Cache Management Commands

# Check cache statistics
pcu cache --stats

# Clean stale cache entries
pcu cache --clean

# Warm up cache for faster subsequent runs
pcu cache --warm

# Reset cache completely
pcu cache --reset

CI/CD Cache Integration

- name: Cache PCU Data
  uses: actions/cache@v4
  with:
    path: |
      ~/.pcu-cache
      node_modules/.cache/pcu
    key: pcu-cache-${{ runner.os }}-${{ hashFiles('pnpm-workspace.yaml', 'packages/*/package.json') }}
    restore-keys: |
      pcu-cache-${{ runner.os }}-
      pcu-cache-

- name: Optimized PCU Check
  run: |
    export PCU_CACHE_ENABLED=true
    export PCU_CONCURRENCY=3
    pcu check --timeout 60000

Network Optimization

Registry Configuration

Optimize Registry Selection:

# Use geographically close registries
export PCU_REGISTRY="https://registry-asia.npmjs.org/"  # For Asia
export PCU_REGISTRY="https://registry-eu.npmjs.org/"   # For Europe

# Corporate proxy configuration
export HTTP_PROXY="http://proxy.company.com:8080"
export HTTPS_PROXY="http://proxy.company.com:8080"
export NO_PROXY="localhost,127.0.0.1,*.company.com"

Connection Optimization:

{
  "network": {
    "timeout": 30000,
    "retries": 3,
    "retryDelay": 2000,
    "keepAlive": true,
    "maxSockets": 15,
    "maxFreeSockets": 10
  }
}

Bandwidth Management

# Reduce parallel network requests for slow connections
pcu check --concurrency 1 --timeout 90000

# Enable request compression
export PCU_COMPRESS_REQUESTS=true

# Batch smaller requests
export PCU_BATCH_REQUESTS=true
export PCU_BATCH_SIZE=5

Large Monorepo Strategies

Workspace Segmentation

Organize Large Workspaces:

# pnpm-workspace.yaml
packages:
  - 'apps/frontend/*'
  - 'apps/backend/*'
  - 'packages/ui/*'
  - 'packages/utils/*'
  - 'tools/*'

catalog:
  # Core dependencies
  react: ^18.2.0
  typescript: ^5.0.0

catalogs:
  # Frontend-specific catalog
  frontend:
    next: ^13.4.0
    tailwindcss: ^3.3.0

  # Backend-specific catalog
  backend:
    express: ^4.18.0
    prisma: ^5.0.0

Selective Processing:

# Process by categories with limits
pcu check --include "@company/ui-*" --limit 10
pcu check --include "@company/api-*" --limit 15
pcu check --include "@company/tools-*" --limit 5

# Progressive updates
pcu update --include "@types/*" --target latest
pcu update --include "eslint*" --target minor
pcu update --include "react*" --target patch --require-confirmation

Incremental Processing

Staged Updates:

{
  "strategies": {
    "incremental": {
      "enabled": true,
      "batchSize": 20,
      "delayBetweenBatches": 5000,
      "pauseOnErrors": true
    }
  }
}

Processing Workflows:

# Phase 1: Development tools (safe updates)
pcu update --include "@types/*,eslint*,prettier*" --target latest

# Phase 2: Build tools (minor updates only)
pcu update --include "webpack*,babel*,rollup*" --target minor

# Phase 3: Testing frameworks (patch updates)
pcu update --include "jest*,vitest*,playwright*" --target patch

Memory and Resource Management

Memory Profiling

Monitor Memory Usage:

# Enable memory monitoring
export NODE_OPTIONS="--inspect --max-old-space-size=4096"
export PCU_MEMORY_PROFILING=true

# Run with memory tracking
pcu check --profile-memory

Memory Optimization Techniques:

{
  "advanced": {
    "streamProcessing": true,
    "lazyLoading": true,
    "memoryThreshold": 0.8,
    "gcIntensity": "high",
    "objectPooling": true
  }
}

Disk I/O Optimization

SSD vs HDD Configurations:

# SSD-optimized (faster random access)
export PCU_IO_STRATEGY="random"
export PCU_CACHE_STRATEGY="frequent"

# HDD-optimized (sequential access)
export PCU_IO_STRATEGY="sequential"
export PCU_CACHE_STRATEGY="batch"

File System Caching:

{
  "fileSystem": {
    "watchFiles": false,
    "bufferSize": 65536,
    "asyncIO": true,
    "preloadMetadata": true
  }
}

Performance Monitoring

Metrics Collection

Built-in Metrics:

# Generate performance report
pcu check --metrics --output metrics.json

# Performance dashboard
pcu dashboard --metrics

Custom Monitoring:

# Integration with monitoring systems
export PCU_METRICS_ENDPOINT="https://metrics.company.com/pcu"
export PCU_METRICS_INTERVAL=30000

pcu check --send-metrics

Benchmarking

Performance Benchmarks:

#!/bin/bash
# benchmark-pcu.sh

echo "=== PCU Performance Benchmark ==="
echo "Workspace: $(pwd)"
echo "Packages: $(find packages -name package.json | wc -l)"
echo "Node Version: $(node --version)"
echo

# Clear cache for fair comparison
pcu cache --reset

# Warm run
echo "Warm run..."
time pcu check > /dev/null 2>&1

# Cold run
pcu cache --reset
echo "Cold run..."
time pcu check --verbose | tee benchmark-results.txt

Performance Tuning Guide

Step-by-Step Optimization:

Baseline Measurement

pcu check --metrics --profile > baseline.txt

Enable Caching

export PCU_CACHE_ENABLED=true
pcu check --metrics --profile > cached.txt

Optimize Concurrency

# Test different concurrency levels
for c in 1 2 3 5 8; do
  echo "Testing concurrency: $c"
  time pcu check --concurrency $c > /dev/null 2>&1
done

Network Optimization

export PCU_REGISTRY="https://registry-eu.npmjs.org/"
pcu check --metrics --profile > optimized.txt

Memory Tuning

export NODE_OPTIONS="--max-old-space-size=2048"
pcu check --metrics --profile > memory-tuned.txt

Troubleshooting Performance Issues

Common Performance Problems

Slow Network Requests:

# Diagnose network issues
export DEBUG=pcu:network
pcu check --verbose

# Test registry connectivity
curl -w "@curl-format.txt" -o /dev/null -s "https://registry.npmjs.org/react"

# Alternative registry
export PCU_REGISTRY="https://registry.yarnpkg.com/"

Memory Issues:

# Monitor memory usage
export NODE_OPTIONS="--inspect --max-old-space-size=8192"
pcu check --profile-memory

# Reduce memory footprint
export PCU_STREAM_PROCESSING=true
export PCU_LAZY_LOADING=true

Cache Problems:

# Verify cache health
pcu cache --verify

# Rebuild corrupted cache
pcu cache --rebuild

# Cache statistics
pcu cache --stats --verbose

Performance Regression Detection

Automated Performance Testing:

# .github/workflows/performance.yml
name: Performance Regression Test

on:
  pull_request:
    paths: ['packages/**', 'pnpm-workspace.yaml']

jobs:
  performance:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Baseline Performance Test
        run: |
          git checkout main
          pcu cache --reset
          time pcu check --metrics > baseline.json

      - name: PR Performance Test
        run: |
          git checkout ${{ github.head_ref }}
          pcu cache --reset
          time pcu check --metrics > pr.json

      - name: Compare Performance
        run: |
          node scripts/compare-performance.js baseline.json pr.json

Environment-Specific Optimizations

Local Development

Developer Machine Setup:

# ~/.bashrc or ~/.zshrc
export PCU_CACHE_ENABLED=true
export PCU_CACHE_TTL=3600
export NODE_OPTIONS="--max-old-space-size=4096"

# Project-specific optimization
alias pcu-fast="pcu check --concurrency 5 --limit 20"
alias pcu-full="pcu check --concurrency 2"

CI/CD Environments

Optimization for Different CI Providers:

# Optimized for 2-core runners
env:
  PCU_CONCURRENCY: 2
  PCU_TIMEOUT: 60000
  PCU_CACHE_ENABLED: true
  NODE_OPTIONS: '--max-old-space-size=3072'

steps:
  - name: Optimize PCU
    run: |
      # Pre-warm DNS resolution
      nslookup registry.npmjs.org

      # Configure for GitHub's network
      export PCU_REGISTRY="https://registry.npmjs.org/"
      pcu check --timeout 45000

Production Deployments

Production-Grade Configuration:

{
  "production": true,
  "concurrency": 1,
  "timeout": 300000,
  "retries": 5,
  "cache": {
    "enabled": true,
    "ttl": 86400,
    "persistent": true
  },
  "security": {
    "strictMode": true,
    "verifyChecksums": true
  }
}

Performance Checklist

Quick Wins

Enable persistent caching: export PCU_CACHE_ENABLED=true
Optimize concurrency for your environment
Use geographical close registries
Increase Node.js heap size for large projects
Enable request compression and keep-alive

Advanced Optimizations

Implement CI/CD caching strategies
Configure workspace segmentation for large monorepos
Set up performance monitoring and alerts
Optimize memory management for sustained operations
Implement incremental processing workflows

Monitoring & Maintenance

Regular performance benchmarking
Cache health monitoring
Network latency measurement
Memory usage profiling
Performance regression detection