gVim keeps refreshing the text in the window and cursor movement is so slow the editor becomes unusable long-term
I noticed the effect dissapears in a small window (default size as opened in Windows), But at winheight() 109 it is a problem.
I have the keyboard rate set to max (I use keyrate.exe to set 30ms delay between key repeats)
Syntax is on. Issue does not occur with the "official" x86 package.