# Performance Optimization

## Caching with Redis

```javascript
const redis = require('redis');
const client = redis.createClient();

await client.connect();

async function getUser(id) {
  const cacheKey = `user:${id}`;
  
  const cached = await client.get(cacheKey);
  if (cached) {
    return JSON.parse(cached);
  }
  
  const user = await User.findById(id);
  
  await client.setEx(cacheKey, 3600, JSON.stringify(user));
  
  return user;
}
```

## Database Optimization

```javascript
productSchema.index({ category: 1, price: -1 });

const products = await Product.find().lean();

const users = await User.find().select('name email');

const [user, posts] = await Promise.all([
  User.findById(id),
  Post.find({ userId: id })
]);
```

## Compression

```javascript
const compression = require('compression');

app.use(compression());
```

## Clustering

```bash
pm2 start app.js -i max
```

## Key Takeaway

Cache with Redis. Add database indexes. Use lean() for reads. Enable compression. Run parallel operations with Promise.all(). Use clustering.

Optimize Node.js performance. Learn caching and database optimization.

Performance Optimization

Learn Node.js, NodeJS, and Node JS from basics to advanced concepts including async programming, APIs, and backend development.

Performance Optimization

Performance Optimization

Caching with Redis

Database Optimization

Compression

Clustering

Key Takeaway

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