Hi Daniela,

You can delete multiple instances at once in batches of max 100 objects (docs).

public void BulkDeleteInstances<T>(ICollection<T> instances) where T : InstanceBase<T>
{
if (instances == null)
{
throw new ArgumentNullException(nameof(instances));
}

foreach (var x in instances.Batch(100))
{
DomHelper.DomInstances.Delete(x.Select(y => y.Instance).ToList());
}
}