Ok i cant go into too much detail as the game is unreleased and commercial, but basically.
In the first area i am getting around 15-18fps, it's a small outdoor scene with about 80k tris/Merged meshes via James Tans' method and optimized well. Also using levelstreaming so it's the only one loaded at the time.
If i run the level on it's own i get a solid 60fps on iPad3 but when i run the full game it drops to 18fps.
Our virtual memory is 412MB!
Texture memory at 50MB
Mesh memory at 20MB
What do you think is going so badly wrong here??