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i5 processor is not sufficient for running 4 VM's simeltaneously especially on (i guess) SATA drive. With your machine config the HyperVisor Overhead is too heavy and thus slows down the VM performance. I would suggest you to try the same test with a Single VM which has about 2GB RAM or 2 VM's with 1GB RAM and test if Visual Basic works fine.

As of KVM and Hyper-V both should support Windows Based Cloud VM's. I think in your case its the hardware which is slowing the VMs.