A Galvan Node is currently extremely lightweight and does not "mine" in the traditional sense. If your computer is only a few years old and uses Windows, Mac, and Linux, it will most likely work. These are the current resources required for running a Galvan Node:
4 GB RAM
2 CPU Cores
60 GB Hard Drive
These requirements are subject to change. There may be additional requirements in terms of computational capacity and speed placed on nodes in the future. Lighter nodes will likely still function, but they will be given rewards in proportion to their contribution to the network. More information will be released on this when it is available.