Near A13 (Naha airfield) there are three historical airfields very near each other: the other fields are Machinato and Yanabaru. Naha is the biggest one and it has very many 3D objects in the field area. All the fields are HTC's defaults.
I have also added there three HTC's default big cities: two of those are as Naha town and one is as Shuri town situating very near Naha. And of course all those fields have their capturing towns near them. I have placed all those towns/cities as historical targets to US bombers and jabos: the last and biggest battles on 1945 were just in that southern area of Okinawa main isle!
My frame rates are dropping to 30 in this area, too, but I don't have very good videocard or computer: ATI Radeon 9000 Pro, 1.5 GB processor with 512 RAM memory.
My friends who have better equiptments says that there are no problems with their frame rates. I am normally upping from the other airfields, for ex. A10 (Yontan) and A11 (Kadena) or try to fight over the sea near Naha area. Before I have a better video card...
Oboe, tell me your computer's info, please! And have anyone else these frame rate problems?