I use cocos2d for iphone and in my game I'm using a sprite as static background image.

I've noticed that when removing code for adding the sprite the framerate goes from ~30fps to over 40fps. Is it any other way to show a static background that is less expensive? I'm not moving the background sprite at all.

To code right now:

background = [Sprite spriteWithFile:@"t1_5.jpg"];
[self addChild:background z:0];
background.position = ccp(240, 160);