The SpriteBatch class is a really fast version of the DisplayObjectContainer
built solely for speed, so use when you need a lot of sprites or particles.
And it's extremely easy to use :

var container = new PIXI.SpriteBatch();

for(var i = 0; i < 100; i++)
{
var sprite = new PIXI.Sprite.fromImage("myImage.png");
container.addChild(sprite);
}
And here you have a hundred sprites that will be renderer at the speed of light