A virtual server is a server operating on top of a standard server, and as such, it is unlikely that ManEx would operate as fast as in a normal server. Additionally, as can be noted in the link below, the network access may become bottlenecked since all the stuff for any other virtual servers and for the main server all have to come through the same ports. 

 

Generally speaking, the virtual server is more of a tool to find out if applications can be run under alternate conditions, and would not be considered for a production environment with heavy network loads like ManEx has.