JPEG->MemoryStream = 120тиков а JPEG->Image1 и Image1->MemoryStream = 30тиков?

void __fastcall TForm1::Timer1Timer(TObject *Sender)
{
  DWORD start=GetTickCount();
 
  Bitmap->Height = Screen->Height;
  Bitmap->Width = Screen->Width;
 
 
  HDC  DC=GetDC(0);
  BitBlt(Bitmap->Canvas->Handle  , 0, 0, Screen->Width,Screen->Height,DC, 0, 0, SRCCOPY | CAPTUREBLT);
  ReleaseDC(0,DC);
  Bitmap->PixelFormat=pf8bit;// pf1bit, pf4bit, pf8bit, pf15bit, pf16bit, pf24bit, pf32bit, pfCustom
 
 jpg->Assign(Bitmap);
 mMemStreamBuff->Clear();
 mMemStreamBuff->Position = 0;
 jpg->SaveToStream(mMemStreamBuff);
 
 
 //Image1->Picture->Bitmap->Assign(jpg);
 //Image1->Picture->Bitmap->SaveToStream(mMemStreamBuff);
 //mMemStreamBuff->SaveToFile("D:\\jf.jpeg");
 
  Memo1->Lines->Add(GetTickCount()-start);
}

//---------------------------------------------------------------------------
#define SIZE 64
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    Memo1->Lines->Clear();
    //======================================
    int i = 1;
    int count = 1;
    int t[SIZE][2];
    int START_X = 0;
    for(int q = 0; q < SIZE; q++)
    {
        t[q][0] = 0;
        t[q][1] = 0;
    }
    //======================================
    TMemoryStream *MS = new TMemoryStream;
    MS->Position = 0;
    //======================================
    START_X = GetTickCount();
    t[i][0] = GetTickCount() - START_X; t[i][1] = t[i][0] - t[i-1][0]; i++; count++; // 1
 
    Graphics::TBitmap *Bitmap = new Graphics::TBitmap;
    TJPEGImage *Jpg = new TJPEGImage;
    Bitmap->Width = Screen->Width;
    Bitmap->Height = Screen->Height;
    t[i][0] = GetTickCount() - START_X; t[i][1] = t[i][0] - t[i-1][0]; i++; count++;
    BitBlt(Bitmap->Canvas->Handle, 0, 0, Screen->Width, Screen->Height, GetDC(0), 0, 0, SRCCOPY);
    t[i][0] = GetTickCount() - START_X; t[i][1] = t[i][0] - t[i-1][0]; i++; count++;
    Jpg->Assign(Bitmap);
    t[i][0] = GetTickCount() - START_X; t[i][1] = t[i][0] - t[i-1][0]; i++; count++;
    Jpg->CompressionQuality = 100;
    t[i][0] = GetTickCount() - START_X; t[i][1] = t[i][0] - t[i-1][0]; i++; count++;
    Jpg->Compress();
    t[i][0] = GetTickCount() - START_X; t[i][1] = t[i][0] - t[i-1][0]; i++; count++;
    Jpg->SaveToStream(MS);
    t[i][0] = GetTickCount() - START_X; t[i][1] = t[i][0] - t[i-1][0]; i++; count++;
    MS->SaveToFile("123.jpg");
    t[i][0] = GetTickCount() - START_X; t[i][1] = t[i][0] - t[i-1][0]; i++; count++;
    //======================================
    delete Jpg;
    Jpg = NULL;
    delete Bitmap;
    Bitmap = NULL;
    delete MS;
    MS = NULL;
    //======================================
    for(int q = 1; q < count; q++)
    {
        Memo1->Lines->Add(IntToStr(q) + ":" + IntToStr(t[q][0]) + ":" + IntToStr(t[q][1]));
    }
    //======================================
}
//---------------------------------------------------------------------------

  DWORD start=GetTickCount();
 jpg->SaveToStream(mMemStreamBuff);
  Memo1->Lines->Add(GetTickCount()-start);//равно 0 тиков