IntelliJ IDEA and Scala being awfully slow on Windows 8.1

At work we are working mostly in Scala and most of us are using IntelliJ IDEA for coding. The choice of the operating system is up to the developer. As I am quite convenient with Windows (and use MS Office quite often), I am a happy Windows 8.1 user (btw: who the hell needs a start button when you have the windows key!? Anyways … different story).

The Problem

After a while when I started a Scalding project, IntelliJ became very slow and often turned to be non responsive for some seconds about once per minute. So over all it was a very inconvenient and unproductive situation.
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