using System;
 
public class Test
{
    class A{}
    static bool F<T>(T a, T b) where T : class
    {
        return a == b;
    }
 
    static bool F2(A a, A b)
    {
        return a == b;
    }
	public static void Main()
	{
		var a = new A();
        var dt = DateTime.Now;
for (int i = 0; i < 100000000; i++)
    F<A>(a, a);
Console.WriteLine(DateTime.Now - dt);
 
dt = DateTime.Now;
for (int i = 0; i < 100000000; i++)
    F2(a, a);
Console.WriteLine(DateTime.Now - dt);
	}
}

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