intelliJ 2016.3 Java debugger launch takes a long time

It always takes about 11 seconds for the debugger to launch. Even when I just create a new command line project with just a single class, containing a line of code (println) it takes 11 seconds to fire up the debugger. When I just run the code, it fires up immediately though. Repeated tries to launch the debugger show the exact same behaviour - 11 seconds every time...

Any idea what might be causing this? I checked with a friend who doesn't see this behaviour on his own installation.

Running intelliJ 2016.3 on macOS Sierra. The previous version of intelliJ showed the same behaviour. 

Thanks,

Olaf