if it plays video at a fast framerate, it will do what you want very fast. the apps i run off of the sd loads fast. what you really want to know is how fast the sd transfer files on the z. i remember the sl5500 had problems and this c1000 might have a speed limit as well. so x80 might not be necesseraly good at all compared to x10. Depends on the zaurus.
but if you plan on using the sd on a high performance camera, you will definetly need a very fast sd.