My game was unplayable throughout most of the game due to some weird lag, i wasn't even able to scroll around the map properly because of it.
I have an FX6300 and a RX580. I don't remember having ever had this kind of lag, and I have played quite a lot of ZK with the FX6300. Perhaps it is a matter of the GPU? This one is quite recent and my previous one was an nvidia 8600, which was pretty damn old but at least didnt have these problems.
The graphics settings used were 'high'. I'm gonna try compat and see if i get any problems but it is a pity having to use low graphics when you have 8GB of GPU ram :P