I'm running the OS X El Capitan DP on my rMPB and the interface has been extremely choppy and sluggish every now and then. It feels like it's stuck and i just need to run a few animations to get it to unstick. After a while it'll restock up again. That goes for everything including typing in text fields and opening apps. Anyone have any idea what is causing this? The previous DP didn't have this issue at all. It was 100% smooth. Am I the only one with this issue?