protobuf-net序列化性能问题

private static void ProtoBufSerializer(IQueryable<DataRow> details)
    {
        List<DataRow> list = details.ToList();

        using (var file = File.Create(\"protobuf2.bin\"))
        {                
            Serializer.Serialize<List<DataRow>>(file, list);
        }
    }

    private static void DataContractSerializer(IQueryable<DataRow> details)
    {
        DataContractSerializer serializer = new DataContractSerializer(typeof(List<DataRow>));
        List<DataRow> list = details.ToList();

        using (FileStream fileStream = new FileStream(\"testSerializationDataContract.xml\", FileMode.Create))
        {
            serializer.WriteObject(fileStream, list);
        }            
    }

[ProtoContract]
public class DataRow
{
    [ProtoMember(1)]
    public DRFDataRow DrfDataRow;

    [ProtoMember(2)]
    public Guid guid;
}

[ProtoContract]
public class DRFDataRow : FixedWidthRow
{
    [ProtoMember(1)]
    public int CompanyNumber { get; set; }

    // several fields abreviated for brevety
}

[ProtoContract, ProtoInclude(100, \"DRFDataRow\")]
public abstract class FixedWidthRow : IProviderRow
{
    // several fields abreviated for brevety