NUnit tests comparing sync, async, lazy

gistfile1.cs

//PM> Install-Package Rx-Linq
readonly List<string> _list = new List<string> { "http://www.google.com", "https://www.gmail.com", "http://www.aripaev.ee" };
private readonly string format = "[{0}] {1} : {2} [{3}]";
[Category("WebClient")]
[TestCase("sync" )]
public void SynchronousTest(string name)
{
    DateTime start = DateTime.Now;
    var dict = _list.ToDictionary(o => o, o => new WebClient().DownloadString(new Uri(o)));
    dict.Keys.ToList().ForEach(o => Console.WriteLine(format, DateTime.Now - start, o, dict[o].Length, name));
}
[Category("WebClient")]
[TestCase("async")]
public void AsynchronousTest(string name)
{
    DateTime start = DateTime.Now;
    var dict = _list.ToDictionary(o => o, async o => await new WebClient().DownloadStringTaskAsync(new Uri(o)));
    dict.Keys.ToList().ForEach(o => Console.WriteLine(format, DateTime.Now - start, o, dict[o].Result.Length, name));
}
[Category("WebClient")]
[TestCase("lazy")]
public void LazyTest(string name)
{
    var start = DateTime.Now;
    var dict = _list.ToDictionary(o => o, o => new Lazy<string>(() => new WebClient().DownloadString(new Uri(o))));
    dict.Keys.ToList().ForEach(o => Console.WriteLine(format, DateTime.Now - start, o, dict[o].Value.Length, name));
}

gistfile2.txt

[00:00:00.9520952] http://www.google.com : 51348 [sync]
[00:00:00.9520952] https://www.gmail.com : 58704 [sync]
[00:00:00.9520952] http://www.aripaev.ee : 208324 [sync]

[00:00:00.0010001] http://www.google.com : 51412 [lazy]
[00:00:00.6550655] https://www.gmail.com : 58664 [lazy]
[00:00:00.7690769] http://www.aripaev.ee : 208324 [lazy]

[00:00:00.1430143] http://www.google.com : 51366 [async]
[00:00:00.3430343] https://www.gmail.com : 58616 [async]
[00:00:00.5150515] http://www.aripaev.ee : 208324 [async]