The two main considerations for eVSM performance tend to be CPU clock speed and RAM available. We recommend using a machine with at least 4GB of RAM available at a minimum. Having 8-16GB should provide better performance with eVSM, as long as you are running the 64 bit editions of Microsoft Visio and Excel. A machine running dual core processors with around 2GHz per core should perform sufficiently.
As long as you have a 64 bit system with 64 bit Office/Visio, the more RAM and CPU speed you have, the better the performance will be. Also, having a solid state hard drive will help with loading and saving large Visio files.
Avoid working on files while they are on shared drives. Instead, copy the file to the local drive to edit.