Before or after the release patch? The lowest frame dip I have had was on Erangel during the opening lobby, it dropped to 55. Shroud runs the game at about 140 on his monster of a rig.
The 1.0 patch caused me to go from a bit of a stuttery 40 FPS on medium to low to extremely smooth on Ultra-lite (Like I said before, I turned shadows down to high).