[Tuxer]

Right now it's extremely scene dependent. If your scene works well with it ( lots of far objects, not too many objects in the clip plane area ) it can get you 20+% perf wins. If you have a scene that doesn't work with it ( small rooms, lots of objects in the clip plane ), you're gonna lose performance, as there is a non trivial cost of running that third monoscopic view and doing the mono compositing into the stereo buffers.

The feature can be dynamically turned on or off though, so devs can work with that :)

We still have issues with transparency around the clip plane area.