Sorry, a few words about RAM vs textures. Trying other mods I have tried several times to replace MBM files with PNG ones. I have converted MBMs to PNGs with mbm2png utility from kerbalspaceport, then sometimes compressed png with a graphics software. Every time I've gotten the same result: PNG files are greatly less in GameData directory, the game starts more fast, all looks amusing. But the Task Manager shows that PNG greatly increased RAM used by KSP (for hundreds of MBytes). As I can see, all USI textures are PNGs. Maybe, converting them to MBM would decrease RAM usage. I would check this myself, but have absolutely no idea how to convert PNG to MBM.