Trees caused the biggest frame hit for me so I turned them way down (it's not like you can't see them at all on low settings). I set most everything else at mid range. Of course, the P-40 I was flying didn't stir up a ruckus. Switched over to IJN. My Zero made its first pass on BB row with just an aux fuel hit. Second pass took off a wing. My D3 dropped (and missed) .... and lost a wing. My B5 was almost in the channel to drop a torp and my pilot just plain died outright.
Map looks pretty good, though. Kinda wish the shoreline was more natural looking (and the sand was less white - no matter how white the sand was).

Frame-rates stayed round about the 30s-40s once I tones down the trees.