Joined January 2014
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@reza-samee Thanks for your comment.
As I mentioned there are plenty of other processes which are resident in the RAM while their priority is very low. Like MySQL, Apache for Roundcube and other Virtualmin services.
Swap guarantees that those less important processes will be moved to disk when there are more important processes (Play apps) to live in the RAM; that is exactly what I'm looking for. They are just custom-made CMS websites and I have to keep the server costs at minimum ;) They don't mind if I work with PHP and deploy on very cheap servers or develop on Scala with full asynchronous architecture and build and maintain the server by my self :D
Finally, the performance is great! I don't have any problem since then.