Those tests were local on Ubuntu 14.04 LTS base OS actually. I do use virtio on Proxmox machines.When running i/o tests did you test openvz or kvm with virtio on proxmox? When using kvm make sure to use virtio for hard disk and ethernet.
Virtio is paravirtualized and is much faster.
@TechIsCool Yes - that is exactly it. Very high/ dark ceilings though so basically no light bouncing from up there.