[vtkusers] why vtk is consuming so much memory? 1000 vtkActors * 300 vtkLines

[higherone]

I have 1000 vtkActors, and in each vtkActor there are 300 vtkLines.when this 
little sample runs, it consumes about 150 Mb Memory .Is this a normal 
thing?If not, please tell me what is wrong, or any way to improve the 
performance . Thanks.
my code is below.

// drawlines.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkProperty.h"
#include "vtkInteractorStyleTrackballCamera.h"
#include "vtkSphereSource.h"
#include "vtkPoints.h"
#include "vtkPolyVertex.h"
#include "vtkUnstructuredGrid.h"
#include "vtkDataSetMapper.h"
#include "vtkCamera.h"
#include "vtkLine.h"
#include "vtkAxes.h"
#include "vtkTubeFilter.h"
#include "vtkDoubleArray.h"
#include "vtkCellData.h"
#include "vtkFloatArray.h"
#include "vtkLookupTable.h"

int _tmain(int argc, char* argv[])
{
 vtkRenderer *ren=vtkRenderer::New();

 for (int m=0; m<1000; m++)
 {
  vtkPoints * points = vtkPoints::New();
  points->InsertPoint(0,0,0,0);
  points->InsertPoint(1,10,0,0);
  //points->InsertPoint(2,0,10,0);
  //points->InsertPoint(3,10,10,0);
  //points->InsertPoint(4,0,0,0);
  vtkUnstructuredGrid * grid=vtkUnstructuredGrid::New();
  grid->SetPoints(points);
  points->Delete();

  int nLineNum(300);
  for(int i=0;i<nLineNum;i++)
  {
   vtkLine *aline = vtkLine::New();
   aline->GetPointIds()->SetNumberOfIds(2);
   //aline->GetPointIds()->SetId(0,i);
   //aline->GetPointIds()->SetId(1,i+1);
   aline->GetPointIds()->SetId(0,0);
   aline->GetPointIds()->SetId(1,1);
   grid->InsertNextCell(aline->GetCellType(), aline->GetPointIds());
   aline->Delete();
  }




  /*//set the color lookup table
  vtkLookupTable *pLookup = vtkLookupTable::New();
  pLookup->SetTableRange(0, 2);
  pLookup->SetTableValue(0, 1, 1, 0);
  pLookup->SetTableValue(1, 0, 1, 1);
  pLookup->SetTableValue(2, 1, 0, 1);
  pLookup->SetNumberOfTableValues(3);

  //set color index for every line
  vtkCellData *cellData = grid->GetCellData();
  vtkIntArray *colourPts = vtkIntArray::New();
  for(int i=0; i <nLineNum; i++)
  {
   colourPts->InsertNextValue(0);
  }
  cellData->SetScalars(colourPts);*/

  vtkDataSetMapper *map1 = vtkDataSetMapper::New();
  map1->SetInput(grid);
  grid->Delete();
  //map1->SetLookupTable(pLookup);
  //map1->SetScalarRange(0, 2);

  vtkActor *actor1 = vtkActor::New();
  actor1->SetMapper(map1);
  actor1->GetProperty()->SetColor(0.0,0.0, 1);
  map1->Delete();

  ren->AddActor(actor1);
  actor1->Delete();
 }

 ren->SetBackground(1, 1, 1);

 vtkRenderWindow* win=vtkRenderWindow::New();
 win->AddRenderer(ren);
 win->SetSize(400,400);

 vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();

 iren->SetRenderWindow(win);
 win->Render();
 iren->Start();
 //iren->Initialize();

 ren->Delete();
 win->Delete();
 iren->Delete();

 return 0;
}