Moving 50 Sprites in Cocos2d

Question

I have about 50 small sprites I want to move around a layer. I've been looking at a couple of different options. What would be the most efficient way of doing this? (They will be constantly moving).

I've looked at PathAction ( http://code.google.com/p/cocos2d-iphone/issues/detail?id=63 ) I've also thought about just a straight up [sprite schedule: @selector (step:) interval:0.1];

What do you think would be the most efficient way of doing this?

Thanks for your help!