# DurableJobsOptions.SlowStartInitialConcurrency

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.durablejobs/orleans.hosting.durablejobsoptions/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.durablejobs/orleans.hosting.durablejobsoptions/properties/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.DurableJobs/Hosting/DurableJobsOptions.cs)

```csharp
public int SlowStartInitialConcurrency
```

Gets or sets the initial number of concurrent jobs allowed per silo when slow start is enabled. Concurrency will exponentially increase from this value until [DurableJobsOptions](/orleans/docs/api/csharp/microsoft.orleans.durablejobs/orleans.hosting.durablejobsoptions/) is reached. Default: `System.Environment.ProcessorCount`.