title: IntelliJ 15 Works Slow and eats 1GB of RAM
body: <p>I just have installed <code>intelliJ IDEA 15</code> but it's somehow laggy and uses a lot of RAM. Sometimes more than 1GB on my 4GB-RAM laptop.
  Are previous versions of <code>intelliJ</code> better in performance?
  How can i make it faster?
  And another problem I have is with Auto completion and correction. 
  Where are these two settings? Cause it doesn't seem as good as Eclipse.</p>