Originally Posted by
henrystreet
If the Iwo Jima scenery package was designed for or converted from FS2004, this is very common. Again, if this is the case, the only way to improve performance with that scenery is the tedious process of converting it all to native FSX objects and bgl files.
Is the Iwo Jima scenery of FS2004 origins?
EDIT: I see the scenery is native FSX. If you want all the "eye candy" you may have to deal with the performance. Otherwise, if you can find, for example, the bgl file that has the static aircraft in it, you can remove/rename it to stop those objects from rendering. This would help the overall FPS but may defeat the purpose of the scenery for you.