Article: http://www.zzzprojects.com/entity-framework-extensions/docs/how/benchmark

entity-framework-extensions-docs-how-benchmark-example-1.cs

public Benchmark()
{
    // BENCHMARK using Stopwatch
    var clock1 = new Stopwatch();
    var clock2 = new Stopwatch();

    var nbRecord = 1000;
    var nbTry = 5;

    var list = GenerateData(nbRecord);

    // BENCHMARK: JIT compile library first
    Test1(list, null);
    Test2(list, null);
    
    for (var i = 0; i < nbTry; i++)
    {
        Test1(list, clock1);
        Test2(list, clock2);
    }

    var r1 = clock1.ElapsedMilliseconds/nbTry;
    var r2 = clock2.ElapsedMilliseconds/nbTry;
}

public void Test1(List<string> lines, Stopwatch clock)
{
    using (var ctx = new CustomerContext())
    {
        var customers = new List<Customer>();

        foreach (var line in lines)
        {
            var customer = new Customer();
            // ...code...
            customers.Add(customer);
        }

        ctx.Customers.AddRange(customers);

        // BENCHMARK: Only method we want to test
        clock.Start();
        ctx.BulkSaveChanges();
        clock.Stop();
    }
}

public void Test2(List<string> lines, Stopwatch clock)
{
    using (var ctx = new CustomerContext())
    {
        var customers = new List<Customer>();

        foreach (var line in lines)
        {
            var customer = new Customer();
            // ...code...
            customers.Add(customer);
        }

        ctx.Customers.AddRange(customers);

        // BENCHMARK: Only method we want to test
        clock.Start();
        ctx.SaveChanges();
        clock.Stop();
    }
}

public List<string> GenerateData(int nbRecord)
{
	var list = new List<string>();

	for (var i = 0; i < nbRecord; i++)
	{
		list.Add(i.ToString());
	}

	return list;
}