MacBooks (12 inch) are no longer brand new, so users have had ample time to experience their limitations. So now that the honeymoon period is over, When does your MacBook get hot? What tasks, loads, etc? How hot does it get? Does it become irritating to keep it on your lap? Also, under what tasks and activities do you experience lag, wait times , etc with the MacBook that are significant enough that they're noteworthy to you and make you wish it had more power?