P3D. I noticed my CPU going crazy lately at my usual settings during cruise flight and some unusual cloud renderings. I thought it was just me but turns out, there are several who have experienced this issue as well after the latest update. If you are using P3Dv2.3 only, you can implement this temporary "hack" until the team releases an official service pack. Click the source link below for the fix. Thanks to Jerome Zimmermann for the tipoff.