# Consumer Lag

Diagnose and fix consumer lag.

## Identifying Lag

```csharp
var lag = streamHead - checkpoint;
```

## Fixing Lag

1. Increase batch size
2. Add more consumers
3. Optimize event handlers
4. Check database performance

## See Also

- [Troubleshooting Overview](README.md)
- [Consumer Groups](../event-streaming/consumer-groups/README.md)