DisplayLink v5.2.1 , macOS 10.14.6, MacBook Pro 13,3. Memory leak in WindowServer
I am using 1 DisplayLink screen, 3 other external screens (2 HDMI, 1 mini DisplayPort) and the internal laptop screen. I have noticed that over time, the WindowsServer process's memory use slowly creeps up, unless the user logs out and logs in again (restarting the window server) Sleeping the Mac does not prevent this. Eventually, the Mac reports that it is "Out of Application memory" and the computer must be rebooted. This only seems to happen if I use the DisplayLink screen.
This is a relatively recent change. I've been using DisplayLink for many OS X/macOS releases and think that this started when I switched to macOS 10.14.x