The virtualization type a VPS provider uses determines what you can run, how much performance you get, and whether your workloads are isolated from neighbors. Three technologies dominate the market — KVM<\/strong>, OpenVZ<\/strong>, and LXC<\/strong> — and each has distinct trade-offs for CPU performance, kernel access, and memory guarantees.<\/p>\n\n\n\n KVM is a Type 1 hypervisor<\/strong> integrated into Linux. Each VM runs its own kernel, has its own memory pages (hard-allocated), and can use any OS — Ubuntu, CentOS, Windows, FreeBSD, etc. CPU and I\/O overhead is roughly 2–5% vs. bare metal. KVM is the gold standard for VPS workloads that require consistent performance, custom kernel modules, or non-Linux operating systems.<\/p>\n\n\n\n OpenVZ is a container-based<\/strong> virtualization where all VPS instances share the host kernel. It offers the highest density (more VPS per physical server), which makes it cheap — but it comes with significant limitations. You cannot modify the kernel, load kernel modules, or run operating systems that differ from the host. Memory is soft-allocated via beancounters, meaning the host can reclaim resources under pressure.<\/p>\n\n\n\n Warning:<\/strong> OpenVZ does not support Docker, systemd containers, or modern cgroups v2. If your application requires containerization, choose KVM.<\/p>\n\n\n\n LXC (Linux Containers) is a userspace container runtime<\/strong> similar to OpenVZ but built on upstream kernel features (cgroups, namespaces). LXD is Canonical management layer on top of LXC. Like OpenVZ, containers share the host kernel, but LXC offers better isolation through user namespaces and finer-grained resource limits. Performance overhead is near-zero (~1%).<\/p>\n\n\n\nKVM (Kernel-based Virtual Machine)<\/h2>\n\n\n\n
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OpenVZ<\/h2>\n\n\n\n
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LXC \/ LXD<\/h2>\n\n\n\n
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Side-by-Side Comparison<\/h2>\n\n\n\n