Not entirely sure, but this may have been the relevant fix.
https://git.xfce.org/panel-plugins/xfce4-whiskermenu-
plugin/commit?id=5c285dc7de12df8ae9ea7e13ac3f339952506161
** Changed in: xfce4-whiskermenu-plugin (Ubuntu)
Status: Incomplete => Fix Released
--
You received this bug
Using 2.2.0-1 at the moment. Lag is gone/not noticeable. Thanks!
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1772100
Title:
Testing Xubuntu 18.10: there's a lag when opening whiskermenu
To
Please test with the latest version 2.2.0 which was uploaded on
2018-05-22.
** Changed in: xfce4-whiskermenu-plugin (Ubuntu)
Status: New => Incomplete
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
