void Main()
{
    int iterations = 10000;

    var watch = Stopwatch.StartNew();
    for(int i = 0; i < iterations; ++i)
    {
        var ev = Event;
        if(ev != null)
            ev(this, null);
    }
    watch.Stop();
    watch.Elapsed.TotalMilliseconds.Dump();

    Event += (s, e) => { };

    watch = Stopwatch.StartNew();
    for(int i = 0; i < iterations; ++i)
        Event(this, null);
    watch.Stop();
    watch.Elapsed.TotalMilliseconds.Dump();
}

event EventHandler Event;