Gmap load large markers cause no responding.

[Abellesh]

marker = new GMarkerGoogle(point, GMarkerGoogleType.red_small);
marker.ToolTipMode = MarkerTooltipMode.OnMouseOver;
marker.ToolTip.Fill = new SolidBrush(Color.FromArgb(100, Color.YellowGreen));
marker.ToolTip.Foreground = Brushes.White;
marker.ToolTip.TextPadding = new Size(30, 30);
lay.Markers.Add(marker);
this.gMapControl1.Overlays.Add(lay);
gMapControl1.Update();