title: What is the indexing penalty in CQEngine for a fast changing collection?
body: <p>I'm considering <a href="https://code.google.com/p/cqengine/" rel="nofollow">CQEngine</a> for a project where I need to handle lots of real time events and execute some queries from time to time. It works well for returning the results but I noticed that the larger the collection gets the slower it becomes to add or remove elements to/from it.</p>
  
  <p>I have a few simple indexes added on the collection so I'm assuming the delay is because on each event added/removed the indexes are updated. I also get an OutOfMemoryError on large numbers of events, from the indexes increasing along with the collection I think.</p>
  
  <p>So my question is, what is the indexing penalty in CQEngine for a fast changing collection (elements often added and removed from the collection)?</p>