Im stuck in this weird issue, my kernel task is always hogging huge amounts of ram such that the MBPr gets laggy mostly while editing videos. How do i resolve this issue? I never had this on my early 2013 retina. Also whenever i hoop up to ac power if i was working on something which did not make the fan go up after connecting to the mains the fans spin up. Till i quit all apps and let it idle for a while.