[Wine] I want to be able to minimise WoW

[fullyspenged]

OS: Arch Linux (64-bit) (fully updated)
GFX Card: Geforce 8800GT (driver version irrelevant - had problem for a year)
WM: Openbox

Problem: Whenever I minimise WoW, the fps drops to sub-10. I can solve this by minimising and maximising the window again, but if I wait too long after minimising, it doesn't always work. Also, if I minimise it by accident too many times, it also doesn't work.

The way I've put up with it is basically just never minimising it.. heh, I just play it in windowed mode and never ever minimised it, just changed to other programs without touching WoW.

I want to be able to play in fullscreen mode now and I was wondering if there was anyone who knows how to solve this problem.

Thanks