Same problem... When i look at threes, a have about 10-15 FPS. No problem with water 60+ fps in all max settings (5 fps in all hight when look at trees).
I7 930 2.8 Ghz (overclocked to 3.5 Ghz)
6 Gb 3 channel DDR 3 1333 (~1800 Mhz overclok)
Asus P6X58D-E motherboard with last BIOS path
Gigabyte GTX 780 ti GV-N78TOC-3GD (675$)
BTW, StarCitizen have 60+ FPS in all high settings
And now proplems in other games.
Add: i changed server, and slow tree's quality, and i have 60 fps + ) It's now work in previous sever