I'm using RubyMine on my MacBook Pro 2017, High Sierra (macOS 10.13), for a very little project (less than 10 files).
The problem is that, whenever I start typing code, copy-pasting some code etc.., the CPU is used at more than 150% by RubyMine! Most of the time it's more than 200%. And my MacBook's fan starts to turn at full speed.
I also tried the EAP version but I experience the same thing...