‘external file changes sync may be slow the current inotify watch limit is too low’ http://ggarcia.me/2016/07/12/intellij-inotify-arch.html
To fix the warning about fs.inotify.max_user_watches the IntelliJ shows, it is necessary to set a value for the fs.inotify.max_user_watches and then apply the change.
Here are the commands necessary to fix the issue on ArchLinux:
1 2 sudo echo 'fs.inotify.max_user_watches = 524288' >>/usr/lib/sysctl.d/50-default.conf sudo sysctl -p --system More information about this can be found in here and in here.