Editing Conversational Monitor System (section)

===Performance===
CMS earned a very good reputation for being efficient, and for having good human factors for ease of use, relative to the standards of the time (and of course prior to widespread use of [[graphical user interface]] environments such as are commonly used today). It was not uncommon to have hundreds (later: thousands) of concurrent CMS interactive users on the same VM mainframe, with sub-second response times for common, 'trivial' functions. VM/CMS consistently outperformed MVS and other IBM operating systems in terms of support for simultaneous interactive users.