Re: Xubuntu slowly with games / laptop battery.
This is a support forum for Ubuntu and official derivatives. Since you clearly state that Xubuntu works well for you, then it's clearly a problem with the customizations made in Voyager. It would be difficult for most of us to find the cause of you problem. Perhaps you would have more luck if you wrote in a Voyager-specific forum or support mailing list. I hope you speak French...
If nothing helps, you might think of simply installing Xubuntu and adding AWN, Conky and other Voyager tweaks in a stepwise fashion so you can look out for signs of slowdown, if any.
Cheers!
husband@wife$ make sandwich
Permission denied
husband@wife$ sudo make sandwich