Unfortunately, the Arc Native Mac Client is very unstable.
I tried With CrossOver 14.0.3, using the Tie file and choosing the Installer from Perfect World.
I did not tried from Steam.
I launch the patch processing for a few minutes to check it.
I did not complete this step. I copy another full working folder coming from my bootcamp ...
The first launch is VERY SLOW , about 10 minutes, be patient with the "stuck" Delta Rising screen. Go have a coffee and a donuts ; D'oh!.
I play windowed maximized full video setting.
It crash every 10 minutes, with a Direct3D Fatal Error E_OUTOFMEMORY.
I did the regedit memory tips you can find here : https://www.codeweavers.com/compatibility/browse/name/?app_id=7626;tips=1#tip4989
And I lowered my video setting from max to advanced.
It crash less often. I guess with medium setting it won't crash anymore. You may fine tune the setting about the texture That is obviously the fatale error meaning (RTEX_NULL)
My Mac is quite strong : 3,4 GHz Intel Core i7 8 Go AMD Radeon HD 6970M 2048 Mo
Have fun waiting for a full stable Mac Client
Thanks to Crodeweavers team.