[b]I've always wondered how you could carry almost 10 cars with lasers in them. That must be why the game lags so much! My strategy is probably to try to find as many things in one area as possible... even though you can only reach 1 out of the 3 in a good stage.
I also think the laser carts is the reason for the lag. It got really slow for me some times at the end of the game. Also if I pressed the key for moving left or right too long the elephant never stopped moving in that direction.