High CPU usage when used with Adwaita theme
When using Adwaita theme (light or dark) the CPU usage is a bit high when Whisker Menu is open, and it reaches full CPU load when hovering the mouse over the Whisker Menu button (while it's open) so that the tooltip is shown.
This can be replicated in any machine, distro or GTK 3 minor version, and it happens since at least Whisker Menu 2.6.2.