Oh, bummer. Well the plasma at the base of the waterfall (used as spray and foam) does have a layer blur effect applied to it, so I would be swapping out two plasma effects for each waterfall (one for the waterfall itself, and the other for the foam) for a tiled background with a bounded warp effect, and textures for the foam. I'd also be removing the blur effect.
So it sounds like it would be an improvement, just not a huge one. And there's the issue that if I use textures for the foam instead of plasma, I would be having the game create new foam textures every couple of seconds at the base of each waterfall on-screen, and possibly adjusting the foam's angle every second to have it spiraling slightly.
Man, optimization is a pain in the <img src="smileys/smiley17.gif" border="0" align="middle" />
Still, the waterfall as a tiled background and warp effect seems like an improvement over plasma, so I think I'll go with that at least. Especially since I can turn the warp effect off when the waterfalls are off-screen. I might have to go without foam completely... or create an advanced graphics option for it? Oooo. Controlled by global variables, and turned on or off through the main menu. That could be nice.
Alright, that's enough of a brain dump for one day. Thanks for the help <img src="smileys/smiley1.gif" border="0" align="middle" />