C# parallelize code

public List<string> ProcessX(CancellationToken cancToken = default)
{
	// sequential code
	// ...
	
	// list that we want to be able to process faster
	List<Animal> animals = // ... 
	
	// multithread safe collection
	var animalsDTO = new ConcurrentBag<AnimalDTO>();
	var options = new ParallelOptions
	{
		CancellationToken = cancToken,
		MaxDegreeOfParallelism = GetMaxDegreeOfParallelism()
	};
	
	Parallel.ForEach(animals, options, animal => 
	{
		// process single animal
		// this is just an example to map animal to animalDTO
		// ...
		animalsDTO.Add(Map(animal));
	});
}

private int GetMaxDegreeOfParallelism()
{
	string configured = config["ANIMALS_PARALLELISM"] ?? "4";
	int degree;
	if(!int.TryParse(configured, out degree))
	{
		degree = 4;
	}
	return degree;
}