Thats also my experience.
Seems that the PG map still needs alot of tweaking and optimazion.
Maybe the new "texture unloader" is not put into use on this map yet.
NTTR, Caucasus and even Normandy runs much smoother than the Persian Gulf, though both NTTR and Caucasus ere bigger and at least Caucasus alot mor diverse in terrain features and objects.
+ NTTR is 366.000 square kilometers, mostly desert plus Las vegas.
+ Caucasus is 250.000 square kilomters with alot of forrest, open land and smaller towns.
+ Normandy is 92.916 square kilometers with alot of trees and small villages
+ Persian Gulf is 200.000 square kilometers and mostly desert, though have some big towns.