Logic Pro 10.2.1 Multithreading Option Causes Overloads
There's a new multithreading option in Logic 10.2.1 (Preferences -Audio -Devices Tab) that allows "live tracks" to access multiple CPU threads. Basically any track that is "live" or record enabled, now has access to this multi-threading ability. I can see this being an extremely useful new future, however right now there's an issue when this "Playback & Live Tracks" option is enabled; the CPU usage more than doubles. Until this issue is resolved, make sure to use "Playback Tracks" only if you are experiencing slow downs (especially on tracks that worked fine before the update).