Kerbal Space Program

It would greatly improve memory handling of parts, textures and terrains that currently aren't used would be held in a cached/buffered heap file, or a separate memory segment that is marked as able to be swapped by the OS.

Rather than reloading them when needed, this allows them to be stored in the fully loaded state, cached by the OS if there is enough memory, thus dramatically reducing times to reload, without using valuable program memory.