Great news! Start the week by downloading IntelliJ IDEA 13.1.2, a fresh new update with a lots of enhancements and bugfixes (including the fixes for performance issues). If you're already running IntelliJ IDEA 13.1 and haven't yet received a notification about the update then go ahead and press Check for Updates. Develop with Pleasure!
IntelliJ IDEA 13.1.2 Update is Available