Thanks to Buzzrick (answered on this page, probably above my answer), he mentioned about VCS. Turning off all of the background operations of VCS seemed to have a HUGE impact toward the high cpu usage – it was 150% and now it’s 20%, more or less.
I’m on OS X
Go to: Preferences > Version Control > Background. Now listed under ‘Background Operations’ are 6 options.
I disabled the first three options which are:
Perform update on VCS in background,
Perform commit to VCS in background,
Perform checkout to VCS in background.