Mac Pro 2009 but 5,1 + Radeon 7950 no Mojave Metal - slow
I've got Mac Pro 2009 flashed to 5,1 (to natively support High Sierra) - I've purchased Radeon 7950 because been told it is supporting macOS Mojave - and.... sorry - but got slow window animation "washed" white/grey colours like I've seen somewhere on youtube on unsupported Mac (I think 2008).
7950 is EFI flashed.
Mojave Public Beta 2
So what's wrong?