This example makes a comparison of the memory consumption when using the old V1 and new V2 report engines. Let's use a complex Master-Detail report for comparison. After each build, you can invoke the garbage collector and see the memory consumption:

public Form1()
{

	InitializeComponent();

	using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("MemoryTest.MasterDetailSubdetail.mrt"))
	{
		report1.Load(stream);
		report1.EngineVersion = Stimulsoft.Report.Engine.StiEngineVersion.EngineV1;
		report1.Compile();
	}

	using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("MemoryTest.MasterDetailSubdetail.mrt"))
	{
		report2.Load(stream);
		report2.EngineVersion = Stimulsoft.Report.Engine.StiEngineVersion.EngineV2;
		report2.Compile();
	}
}

StiReport report1 = new StiReport();
StiReport report2 = new StiReport();

private void button1_Click(object sender, EventArgs e)
{
	report1.Render();
}

private void button2_Click(object sender, EventArgs e)
{
	report2.Render();
}

private void button3_Click(object sender, EventArgs e)
{
	report1.RenderedPages.Clear();
	GC.Collect();
	GC.Collect();
	GC.Collect();
}

private void button4_Click(object sender, EventArgs e)
{
	report2.RenderedPages.Clear();
	GC.Collect();
	GC.Collect();
	GC.Collect();
}

In the screenshot below you can see the result of the sample code: