> PPC emulation is still in the beginning.

QEMU's PPC emulation has been existing for 12 years. How long does 'beginning' last?

> qemu is one of the slow ppc emulators...

At least it's faster than the PearPC core used before.

> there are restrictions right now like [...] missing voodoo 3 drivers

As said, what's missing is Voodoo3 emulation. Voodoo3 drivers are there in AmigaOS, hence the choice of this particular graphics card to be emulated.