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Originally Posted by [WoF]Sonny I bet you have OpenVZ VPS, this means that other VPS's can affect your VPS, usually this happens when hosting company oversell their VPS. KVM is more stable.

Half correct; half wrong.

OpenVZ is like some container-based virtualization where if you have Linux, then you put digital containers where each one has its own freedom per-say to install/modify per wish but it's all shared under the master container (the main host), so you cannot modify any core server settings or install any kernel updates; the host has to do it for you. Plus, Linux is being shared all over these containers. You can't expect Windows to be installed under Linux. It's just impossible o-O

KVM is the real deal. It offers you full virtualization, meaning, you will receive a dedicated VPS where you can do literally whatever you want, because the server's all yours. Kernels? Core config? sysctl? All editable. With this, you can install Windows, Linux or w/e you want to because all its resources are all yours. Only thing is that you have to be/you need a sysadmin in order to do something on a KVM because you have to mess around with iptables sooner or later

This article explains more better than I do, hope you get the meaning.

*An instance can't access other instances because OpenVZ is a secure virtualization

In this case, OP is having a restricted KVM access wherein Windows is installed in it. Better move to Linux for better speed and optimize your script to the maximum. Sometimes GUI can prove a fatal issue in low RAM-based servers