I was doing a grass test in DBC to see what I can come up with, and quickly ran into a speed problem, so I decided I would try the textures as a .dds instead of .png, and a noticeable boost was made, but for the cost of quality, (I also dramatically decreased the number of grass objects, to increase speed.)
I want to see what you think is more worth it, .dds or .png... Attached in a .rar file of the .exe's (For some reason, runs no more than 60 fps for either) and the .dba's. Try 'em both out, see what you can say if the quality drop is worth the performance...
For those who do not know what .dds is, it is a compressed image file in VRAM, so it saves more VRAM then any other format, so increases performance.