I'm not sure about the change in CPU usage, but when I use the FSW LJ35a with the FMS expansion package....and I have the latest beta installed.......I get about a third of the way through the flight and it crashes to the desktop. BTW, I have the milvix radar installed but I don't switch it on during the flight.
When I use the same plane and do the same flight with the dual Flight 1 GTN750's installed, no CTD and I can complete the flight.