Management Network

I understand it is best practice to have Management network on its own subnet/VLAN.

In a small environment - 3 hosts (8-10 VMS), do you think it would impact performance much to ahve it on same subnet as VM network and regular PC network traffic.  This is a small environment with 7-8 servers and about 40 PC's.

I isolated vMotion and iSCSI traffic each on their own VLANS.  But it would make things much easier to leave Management on the same subnet as VM/PC traffic.

Any guidance or recommendations are very much appreciated.

Thanks.

Dan