Concurrency. And concurrency. And once again: concurrency. The holy grail to writing good Apps. And the hardest part. At least to debug.
The simplest way to performe a task not on the main thread is: [self performSelectorInBackground:@selector(myConcurrentAction) withObject:nil];
- (void) myConcurrentAction {
NSAutoreleasePool *pool = [NSAutoreleasePool new];
// do whatever needs to be done
// but only all things NOT GUI
// ensure that nothing else tries to access used objects meanwhile
[pool drain];}
