Kitely does it with cloud containers which is vert slow, you need to wait for them to boot. I have that mode, but its better to just suspend the region. I do this by intercepting the teleport request, sending the region UUID and Avatar key to Dreamgrid's API port, and return an appropritat UUID. If the region is powered down, I send them to a parking lot and start the region. Then when region is onlne, like Kitely, teleport them..
The best way is to just stop the region running. It the region is suspended ( no process running, no threads) then I use a system call to unfreeze it, and return the uuid to the viewer. RAM becomes meaningless as windows ( or linux) will swap it out to disk. You only need enough to held the running regions. I routinely run 450 regions on a laptop with hundreds of gigs suspended. No lag at all.
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