How to change the ASGvis temp texture directory?

I think about how to speed up the start of a rendering. For example during the DR the textures are writen to a Temp dir at the slave machine. If a complex scene with large textures is used, than write/read to the HDD needs some time. A way to get it done faster could be to use a RAM disk. Tools for RAM disks allow to create a virtual drive letter. Write and read would be much faster. So, my question is how can I change the ASGvis temp dir at the master and at the slaves.

Regards,
Micha