Phaelax,
I found Firewall to be quite efficient for all the special effects that go on at once on-screen.
But, as has already been said, 2D is not very fasy in DBC.
If you can, make really low polygon models, then make some really nice textures, and it should look nice with the minimum amount of polygons on-screen at once
If you come across some problems with regard to speed, have a look at the stickied thread "How Do I speed Up My Game" up the top of this board.
[/Shameless Self-Promotion]
Jess.

Team EOD :: Programmer/Logical Engineer/All-Round Nice Guy