As far as I know, 'play every frame' has no real timing relevance. It's just to make sure the sim works properly. Definitely playblast the animation to make sure you're getting true 25fps. If it's too slow, check the units of the scene. I think rigid body sims rely heavily on gravity (9.8 m/s/s) and so if your scene is actually tens or hundreds of meters wide, it will be more like dropping the times square ball. (no, I couldn't think of a good comparison).