93% CPU in NetworkIdentity.UNetStaticUpdate (LogStringToConsole)

With the Unity 5.1.1f1 Editor Profiler, my game is seeing very high CPU utilization from string logging in NetworkIdentity.UNetStaticUpdate, even though I have our NetworkManager log level set to Fatal (the least verbose level). I do not see any logs in the console while I see these big purple spikes in the image:

View attachment 150123