First, I suggest checking out this guide: http://smartshow-software.com/how-to-ma … eshows.php

You need the part called Custom Text Animation. The tips told in this one can be applied to other slide elements as well, like images, clipart, shapes, textures, etc.
The main thing: you need to work with the distance between the frames. This controls the animation speed. Large distance - slow animation, short distance - fast animation. You can also try placing more keyframes to have better control over the animation.