Memory requirements?

Hi.

I have issues with pointools on my system.

When I go above, or around 1.000.000.000 points - the system gets laggy and I have experienced the loss of lots and lots of work.

So..

Q: Is 16GB of RAM enough for pointools?
Q: Is the HDD cache used for anything? (I set it to 50GB, but it seems to be reset to 1GB, and hardly used)
Q: Is there a way to get to work with - edit and render smoothly with no errors - 10's of billions of points - at once?

As it is, I need to workaround this by cutting my pointclouds into tiny bits. This makes the process extremely slow and painful..

Any help appreciated.