I made a lot of optimizations on the latest version. not perfect yet but should run more smoothly now.
Just starting the game gives me 75% GPU load. Setting a lower fps with the resolution in the options does not help.
BUT limiting the frames in the GPU drivers worked wonders, only 6-8% GPU load.
Tabbing out of the app, drops the load to 0%, even if the game is still visible.
I guess some parts of your animation/render system run uncapped frames.
Edit:
Nice detail, Serena blinks, Eden does not
But why doesn't chubby's manboobs jiggle like their funbags?