WindowServer process takes a lot of memory I'm using a MBP 13" 2014 on macOS high Sierra with a 4k monitor. 

The memory usage of WindowsServer can go quite high (up to 40 GB).

The only solution I found is to reboot my computer -- as the memory usage never goes down. The problem started with MacOS Sierra I think. 

Does someone has a piece of advice or a better solution than rebooting my computer ? 



And after closing all the running apps on my computer, it is nearly the same memory usage:
According to this article  this appears to be a bug in the system when used with a Scaled Display resolution


  This seems to be a bug with scaled screen resolution (specially with 4K monitors) in MacOS High Seirra (and perhaps in older versions of the OS as well). Using "Default for display" screen resolution seems to fix the issue (Not my ideal resolution, but a temporary fix until an MacOS update with a fix is available). More information here: https://www.tonymacx86.com/threads/windowserver-memory-leak-on-high-sierra.233510/


I am using a scaled (external) display and I am facing a similar problem which is what led me to this topic.