After upgrading from 3.1.1 to 4.1, InterprocessConnection connection attempts show 100% CPU spikes, probably inside connectToSocket(). Happens when a connection can not be made.
The spikes are short, but hefty enough to cause drop-outs and hickups in several DAW that host a Juce plugin or Juce-based ReWire device (seen with Cubase and Ableton Live, while Studio One and Reaper are not affected. Obviously, each DAW shows a different vulnerability to CPU spikes). As a consequence, periodical connection attempts, e.g. inside a ReWire device, can render an entire PC useless for audio applications.
This has not been an issue with 3.1.1. It's an issue on Windows only.
I did not find the time to compare the socket code side by side yet. Will do so as soon as possible. Maybe the authors have an idea where to look first?