+1 On a 4K monitor with scaled resolution with a brand new Mac Pro....Same issue here.. 1060FTW+ with dual 4k monitors..
I removed my 4K monitor entirely but the issue now reappears with my Thunderbolt monitory attached. It just takes quite a bit longer for it to consume the memory without the 4K.+1 On a 4K monitor with scaled resolution with a brand new Mac Pro....
After installing version 10.13.1 beta, seems to be fixed. Using retina resolutio WindowServer process is using 119mb.