At home I'm running 6 lightweight linux VMs on a single host and they are are performing slowly. The machine used to perform quite quickly with only 2 guest machines but as I added more performance suffered drastically. In case it matters, the VMs are super low-traffic webservers used for development of small sites only.
The linux host has the following hardware:
* A slow old AMD dual-core processor
* 8GB of quick RAM
* A single 7200rpm HDD shared by the OS and all VMs
Do any of those in particular stick out as the cause of the slow performance? I want to upgrade but am not sure which pieces need upgrading to run the VMs adequately.