I am running Logic 10.1.1 on a 27" iMac with 8GB of RAM using Yosemite 10.10.3. Only since I downloaded 10.10.3 the system keeps locking and reporting "system overload or slow disc". It doesn't happen in the same place each time but is always when I am playing against a previously recorded part. ( I use logic mainly for "minus one" piano practice). My files barely scratch the surface of Logic in terms of size and I am mystified by what has started to happen. Anyone any ideas??