Hi Dinos, I tested your file over here with _CVolume2 from CVolume.v.2.0.2015.09.27.zip and I get the same 3.5 seconds with both launching from a shortcut key or by typing in the command name.

Could you please double check exactly what you have in your keyboard shortcut? Are you certain it's not running some older version on the shortcut key?

I also tested putting some fillets and booleans onto your shape so it took longer for the calculation and still got the same times between shortcut key or typing in the command name.

- Michael