CloudLinux introduces the concept of LVE – LightWeight Virtual Environment for user isolation. Each LVE has the severe restrictions on CPU, memory, maximum quantity of processors and disk input-output which can not be exceeded. Every process (whether it’s a process handling php-request or cron-task or any command on SSH) is placed in LVE and can not exceed the limits for the user.
The advantage for virtual hosting is that website fewer depends on “neighbor” load for server and can be opened with the constant time. Besides, any sudden DDoS attacks will not anyhow reflect your server thus making the attacked website to work slowly or not open.