AvaloniaUI/Avalonia

I'm testing the speed of rendering function

            Stopwatch stopwatch = new Stopwatch();
            var fb = new Framebuffer(PixelFormat.Bgra8888, (int)this.Width, (int)this.Height);
            var r = AvaloniaLocator.Current.GetService<IPlatformRenderInterface>();
            using (var target = r.CreateRenderTarget(new object[] { fb }))
            using (var ctx = new DrawingContext(target.CreateDrawingContext(null)))
            {
                stopwatch.Start();
                ImmediateRenderer.Render(this, ctx);
                Trace.WriteLine(stopwatch.ElapsedMilliseconds);
                var bmp = new Bitmap(PixelFormat.Bgra8888, fb.Address, fb.Width, fb.Height, fb.RowBytes);
                bmp.Save(@"D:\test1.bmp");
            }

            fb.Deallocate();

            using (var rtb = new RenderTargetBitmap((int)this.Width, (int)this.Height))
            {
                stopwatch.Restart();
                rtb.Render(this);
                Trace.WriteLine(stopwatch.ElapsedMilliseconds);
                rtb.Save(@"D:\test2.png");
            }

ImmediateRenderer.Render seems to be slower than RenderTargetBitmap Render