Major changes include:
- Shared low-level graphics buffers
- Removed many unused fonts and reduced interface memory usgae
- Paged out units which are not visible
- Reduced terrain data size and overhead
- Reduced route data size
- Created a set of low-res movies for machines without dynamic texture support (this is a separate download)

These changes not only reduced the amount of system memory required, but lowered video memory usage extensively. Also, the rate at which the game consumes memory in the late-game has decreased, which is extremely important.