The CPU in iPad 1 was great for its time, and OzRunway I am sure does't get much testing by the developers on a dinosaur.
Actually I only have an iPad1, and Neil & Bas own both.
The thing that crashes OzRunways after a lot of heavy use on iPad1 is the available memory. With only 256mb, probably 100-150mb usable, it is a miracle that we can even get this sort of app running. Firefox uses probably quadruple this amount just reading news.
When it starts running low on memory, iOS sends a bunch of messages to your app telling it that it is getting low on memory. OzRunways kills all the non-visible views until all that is left is what you're looking at.
Now here's the killer; I've done extensive testing & OzRunways has zero memory leaks yet the memory usage still goes up after using for a while. I suspect that the Apple drawing routines have a bug which I'm still investigating. There may be a way around it (different way of drawing) which I'm going to be trialling shortly.
-> Download-all button [done]
-> Choose maps only where you are [done]
-> Download all favourite maps [I'll write this week].