Thanks for your help Ashley , I think I figured it out.
Here's the APK of a project which only has one small sprite, no sounds, but about 7500 big events, which are on an event sheet which is actually never played.
I first filled the projects with lots of big images and lenghty sounds, but the loading time was perfectly ok. But as soon as I added lots of events, the black screen appeared for quite a few seconds. Removing the images and sounds didn't reduce the black screen time.
And here's the capx. You can probably accentuate the problem by adding even more events.
Is this the normal behavior?
Is there a way I can reduce the black screen time on Healer's Quest, which is about 40K events?
I mean... Any other way than removing events... ^^'