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
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https://bugs.launchpad.net/bugs/1772100
Title:
Testing Xubuntu 18.10: there's a lag when opening whiskermenu
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