Multi domain performance penalty????

Stu

Can someone tell me if there is a performance penalty when using multiple domains in a sim. Example, I have a large tank, that I have meshed using icem and cfx-mesh. CFX-mesh for the more complex inlet pipes and Icem for the bulk of the rest of the tank. I join the domains together in cfx-pre and all works well.

Neglecting any difference in nodes/elements/tets/hexes, would the solution take longer to solve because it is using 2 doamins, or would it be faster if I did the entire mesh using 1 domain.

Thanks Stu