Espionages uses the discrete video card all the time

Hello,
I'm using Espionage all the time with my MacbookPro with Retina and I use so I can save some battery juice while working. And it seems like that Espionage keeps the discrete video card active all the time, which drains the battery a lot.
Honestly, I can't see why Espionage's UI needs some much power that the discrete video card needs to be using always (even when no Espionage windows are visible). Is there a reason? Can this be fixed?
I'm using Espionage all the time with my MacbookPro with Retina and I use so I can save some battery juice while working. And it seems like that Espionage keeps the discrete video card active all the time, which drains the battery a lot.
Honestly, I can't see why Espionage's UI needs some much power that the discrete video card needs to be using always (even when no Espionage windows are visible). Is there a reason? Can this be fixed?