I am not sure if you are interested or not, but I reduced how many poly's you had in each model by average of over half of the poly's, like with the wings on the missile, made them from over 100 each to 14 each. I hope you like it, the quality looks the same, just loads/plays faster. (File attached.)
Also, instead of making DB make the plane at the beginning of the program, make a plane on a 3D program to use, as a single plane on DB is triangulated, and double sided. (Meaning 4 pollys, if you make it on a 3-D program on your own, then it will be 1 Polly.) Speeding up the game a little bit more.
Also, when I played it, if it went a little faster, I would like it more, but I can barely see what is happening due to the lag...