beam.smp takes constantly ~20% of CPU

Is this normal? I have read that many other people have same problem, but I haven't found solution. It can't be normal that a database takes 20% of CPU - especially if it's an empty single node and at most one user is accessing it through the web console.

So, is there a solution to this, or is this really meant to be a feature?

I'm using the most recent version (2.0) on both Windows and Linux, with same problem.