It is a good idea in theory, but implementing disk image compression on save has two major issues:
- Compression takes time, which will make system shutdown very slow due to writing and compressing the image files.
- It will break differential writing. At the moment the RAM Disk only writes blocks that changed since the image was last read. This saves a lot of disk I/O and is very fast. With compression that will not be possible.
This is why we have not added it to our RAM Disk.