Chirs thanks for your post.
I might have to rework the firing rate.
At the moment the system works on 1 bullet. It has to pass out of the field of play or hit something (bad alien) before you can fire again.
Maybe a charge system would be better?
Can you tell me your system configuration and what in game setting you ran the game on when you got 15fps? If you can post your fps for the 3 settings (high medium low) it might help me narrow down the cause of the fps drop.
Thanks again
statman
http://statman.webcon.net.au