Terribly SLOW

The information provided is great but it is TERRIBLY SLOW. On iPhone 4S some word definitions take up to 13 seconds, yes 13, to show up!! this is practically useless.
It seems that the delay is proportional to the alphabetical position of the word in their index (e.g., arbeiten is much faster than urlaub). But why?! Is it done by real developers? Lookup speed should not be an issue on such a device over such a simple data structure. 8-/

How can I have my money back?

The Trident about Deutsch Wörterbuch, v1.1