With IntelliJ IDEA 14.1 EAP that has started earlier this week, we now have Scala plugin EAP available for both versions of this IDE.
As Scala plugin 1.3 proved to contain some performance problems, today we are releasing Scala plugin 1.3.3 RC, a preview build with the corresponding fixes. One more important change in this build is the option to rollback to the old implicit search algorithm via Settings/Preferences → Languages & Frameworks → Scala → Use old implicit conversion search algorithm. Use this option only if you encounter red code or performance problems. In this case please do report these issues to our tracker. This will help us safely migrate to the proper new algorithm.
Develop with Pleasure!