I got an issue from the Jetbrains Support Team. It seems the latest version of the plugin causes many issue in the Swing Event Dispatch Thread.
This is probably due to the Autorefresh feature that use the Timer Tasks and for manual refresh, the ExecutorService. The job gets the data from the server and update the UI within a Swing thread.
I currently investigate this issue that causes lower performance of the IDE and I will release a minor version in a couple of days.
Sorry for the inconvenience,