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what virtualization technology do your vps server use? KVM, XEN or OpenVZ?

Most of our products currently use OpenVZ, which is more cost effective to provide. We have started providing KVM in some locations.

OpenVZ uses a shared Linux kernel system and offers better over performance on the hardware and uses less memory for the same number of clients than KVM or XEN.

XEN has essentially been replaced by KVM

KVM boots a separate instance of the Kernel for each client. This had advantages in that clients can run their own custom Kernels and boot images