I've upgraded to 2016.2 today (Build #PS-162.1121.38, built on July 12, 2016) and immediately noticed considerable slow down when doing anything in the IDE (editing any file, running any Grunt/Gulp jobs, etc.). Basically, the same thing described here https://youtrack.jetbrains.com/issue/IDEA-157837. Actually, IDE just stopped responding after running one of the Grunt jobs now (which I'm running every day multiple times and never had issue up til now).
Unlike that ticket mentioned above, I'm on Ubuntu (16.04) and have a decent workstation laptop (quad core i7, 16GB RAM, SSD). I'm interested if anyone else is experiencing the same issue?