If you are writing to console inside a test, this can really slow down the tests.
First run this and you'll see it's fairly quick to finish.
public void List()
IList list = new ArrayList(500);
for (int i=0; i < 500; i++)
foreach(String item in list)
Now uncomment the Console.WriteLine and you'll find it is significantly slower.
I'm on a 1.8 GHz Pentium M laptop, Dell D600 Latitude, VS.NET 2003.