It can depend. Technically, 2 GB is the minimum requirement, but that may not give you ideal performance. The more objects you poll, and the more the other applications are doing, the more memory will be consumed. If you start to swap, performance will really begin to plummet. You should analyze the memory footprint to see if you're dipping into swap space. You might also try disabling your HUM pollers to reduce overhead, and see if performance improves. If it does, consider putting HUM on its own server, or adding more resources to this server.
