自绘控件时，调用资源图片哪种好一点

 private
    { Private declarations }
    Png:TPngImage;



constructor TMyAppButton.Create(AOwner: TComponent);
begin
  Png:=TPngImage.Create;
  Png.LoadFromResourceName(HInstance,'app_button');
  inherited;
  Width:=Png.Width;
  Height:=Png.Height

end;

destructor TMyAppButton.Destroy;
begin
FreeAndNil(png);
inherited;
end;

procedure TMyAppButton.paint;
var
  R:TRect;
begin
  R := ClientRect;
  Canvas.Brush.Style := bsClear;
  if (FInButtonArea = True)then
  begin
    Canvas.StretchDraw(R,Png);
  end;
end;

 private
    { Private declarations }
    Png:TPngImage;



constructor TMyAppButton.Create(AOwner: TComponent);
begin
  Png:=TPngImage.Create;
  inherited;

end;

destructor TMyAppButton.Destroy;
begin
FreeAndNil(png);
inherited;
end;

procedure TMyAppButton.paint;
var
  R:TRect;
begin
  R := ClientRect;
  Canvas.Brush.Style := bsClear;
  if (FInButtonArea = True)then
  begin
    Png.LoadFromResourceName(HInstance,'app_button');
    Canvas.StretchDraw(R,Png);
  end;
end;

procedure TMyAppButton.paint;
var
  R:TRect;
 Png:TPngImage;

begin
  Png:=TPngImage.Create;

  R := ClientRect;
  Canvas.Brush.Style := bsClear;
  if (FInButtonArea = True)then
  begin
    Png.LoadFromResourceName(HInstance,'app_button');
    Canvas.StretchDraw(R,Png);
  end;
FreeAndNil(png);
end;

请大神指点一下，或者还有其他方法，新手不太会~~~
[解决办法]
当然是第一种，paint会被经常调用的！
[解决办法]
paint方法越少代码越不卡
[解决办法]
第一种，启动的时候加载，尽量避免加载多次。