in fact I use rpg maker 2003 which is absolutely not designed for random level generation. I use the maniac patch for that. During the loading time I tripled the fps (the speed of the game is linked to the number of fps) and even with this it's still slow. I could have done it faster but with only three days I couldn't do better. If you are interested I can put a version of the game without the black screen to better understand what is going on behind!