Hi all, I'm using Managed DX9 for rendering terrain. I'm loading, scavenging etc individual .X and .PNG files for each map segment based on the currently available RAM and Texture Memory on a seperate loader thread. This all works fine but my question is about managing all these files and whether its quicker at runtime to have them merged into a single big file, and use offsets and streams to load the data, or whether the single files are as efficient. I'm a little worried that the constant opening of files is detrimental to performance (even on a seperate thread to the rendering) and wondered what a general purpose strategy for this would be. Thanks Phillip