Reflection in 1.1 and 2.0

I have here a little sample which does reflection on a class.
I striked me that 1.1 is nearly two times faster.
Could me somebody give a hint why?

For the sample: Compile it via "csc.exe /optimize+ Program.cs" with the two
compiler for 1.1 and 2.0.

Thanks
Eric

namespace ComponentProfiling
{
using System;
using System.ComponentModel;
using System.Reflection;

public sealed class Person
{
private string _firstName;
private string _lastName;
private int _age;

public string FirstName
{
get { return _firstName; }
set { _firstName = value; }
}

public string LastName
{
get { return _lastName; }
set { _lastName = value; }
}

public int Age
{
get { return _age; }
set { _age = value; }
}
}

class Program
{
static void Main(string[] args)
{
Console.WriteLine("Runtime version = {0}", Environment.Version);

int iterations = args.Length > 0 ? int.Parse(args[0]) : 1000000;
Console.WriteLine("Iterations = {0}", iterations.ToString("N0"));

Person person = new Person();

PropertyDescriptorCollection properties =
TypeDescriptor.GetProperties(typeof(Person));

string test1 = typeof(TypeDescriptor).Name;

TimeSpan span1 = Measure(iterations, person,
properties["FirstName"],
properties["LastName"],
properties["Age"]);

Console.WriteLine("{0} = {1}", test1, span1);

string test2 = typeof(MyPropertyDescriptor).Name;

TimeSpan span2 = Measure(iterations, person,
new
MyPropertyDescriptor(typeof(Person).GetProperty("FirstName")),
new MyPropertyDescriptor(typeof(Person).GetProperty("LastName")),
new MyPropertyDescriptor(typeof(Person).GetProperty("Age")));

Console.WriteLine("{0} = {1}", test2, span2);

Console.WriteLine("{0}/{1} = {2:P}", test1, test2,
span1.TotalMilliseconds / span2.TotalMilliseconds);

Console.WriteLine("Press ENTER to end.");
Console.ReadLine();
}

static TimeSpan Measure(int iterations, Person person, params
PropertyDescriptor[] properties)
{
DateTime start;
start = DateTime.Now;

for (int i = 0; i < iterations; i++)
{
properties[0].SetValue(person, "John");
properties[1].SetValue(person, "Doe");
properties[2].SetValue(person, 22);
}

return DateTime.Now - start;
}

public sealed class MyPropertyDescriptor : PropertyDescriptor
{
private readonly PropertyInfo _property;

public MyPropertyDescriptor(PropertyInfo property)
:
base(property.Name, null)
{
_property = property;
}

public override bool CanResetValue(object component)
{
return false;
}

public override object GetValue(object component)
{
return _property.GetValue(component, null);
}

public override void ResetValue(object component)
{
throw new NotSupportedException();
}

public override void SetValue(object component, object value)
{
_property.SetValue(component, value, null);
}

public override bool ShouldSerializeValue(object component)
{
return false;
}

public override Type ComponentType
{
get { return _property.ReflectedType; }
}

public override bool IsReadOnly
{
get { return !_property.CanWrite; }
}

public override Type PropertyType
{
get { return _property.PropertyType; }
}
}
}
}

.

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