IPFire is running very well in a virtual environment.

See this chart to get a clue about how many machines are running virtually.

Virtualised systems
24.16%

Hypervisors

This is a list of all hypervisor vendors that IPFire is running on.

VMware
45.61%
KVM
25.83%
Microsoft
15.15%
Xen
10.02%
VirtualBox
2.55%
Unknown
0.84%