I have successfully worked for 2 days without having DisplayLink Manager going to 150% CPU resulting in WindowServer blowing up by uninstalling display link and using a friends little dock for dual displays. Seems this is more reliable than displaylink and is relatively portable. No further issues of high CPU and fans turning on so far in 2 days which simply has not happened with DisplayLink since I completely reinstalled Mojave. Seems that this is the best way to resolve given lack of response from Displaylink.
So in short, fresh clean install of Mojave and displaylink results in high CPU utilisation on Displaylink Manager and also WindowsServer. Unplugging the DisplayLink dock sees the DisplayLink Manager CPU usage go away but WindowServer remains high. You need to reboot twice to recover WindowServer for some reason. Logs sent to Displaylink. No response.
Solution: replace displaylink dock.
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