2 Virtual Machine on 1 core

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http://superuser.com – I have a few computer installed with Hyper-V... I running some automatized programs on it... if I using 1 VM/core works like charm... and i can see its not using the 100% of the core... so i thought I can put 2VM/core but when i'm doing that the whole process slowing down terrible and just use 2VM altogether 30-40% of the core... There is anyway to handle/use the processor on the maximum ? (HowTos)