evil-resize-window is slow
Commands like c-w_ and c-w| seem to take a very long time. I looked at the code and the function evil-resize-window is coded in a way that calls enlarge-window (or shrink-window) once for every requested size delta. I'm sure there is a reason it is coded this way, but it makes commands c-w_ uncomfortably slow.
In my local version, I changed this function so it calls enlarge-window once for a requested delta. With this chance c-w_ and c-w| are much faster.