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My guess is that they are somehow not restricting the area being computed for the rear view mirror to a small subset of what is actually displayed. It happens on my system as well, with a TitanXP. The FPS drops by about 30 to 40%, so disabling them for now.

Well after playing for the last two hours of different video settings, I have actually got mine working "smooth as butter" which seems like the hot button phrase on here. Here is what I found. My system: 32GB RAM Titan XP Oculus Rift Windows 10 Intel i7 3.3 These tests were done with the Oculus HUD and performance enabled to watch the true FPS 1. DO NOT enable distance viewing. If you change it to anything but low the FPS will drop about 25% in most scenes with any object. Plus you will get the "double vision" look on buildings. 2. DO NOT enable shading of any type. Same results as number 1. 3. In the VR settings, lower the pixels to the LOWEST setting. Then override it with the oculus toolkit to what you see fit. I can easily push 2.0 but that is with a Titan XP. Your results may vary. 4. I bind my cockpit view to a voice attack command, titled RESET. Then I sit back quite a distance from the sensor, and reset. This brings me forward in the cockpit which allows much better viewing of the screens, camera, etc. 5. Bind a key or VA command to the camera ( I am playing with the free plane for now) and disable it when not needed. It chews up FPS. 6. DON'T enable your mirrors. This is probably a given, but FPS drops like a rock. 7. Enable Textures to HIGH. It will make the cockpit look wonderful but doesn't seem to have almost any impact on FPS . 8. DO NOT enable any water settings higher then low. Even if there is a lake in the far distance, it will try to render it and FPS drops again. Doing this I am at a very comfortable 90FPS for almost everything. I haven't tried it in combat yet, and doing things like firing missiles will drop FPS for just short bursts, but, overall, very comfortable settings. Final notes, I don't notice any difference enabling MSAA or FSX type settings. No fps drops, but also, not clearer picture. Finally, I disabled HDR, and, same results for me, no difference in my graphics view so turn it all off. Disable all the things you don't need in other settings to keep processor settings lower...

You need to lower your VR settings. I believe it is the distance option tha makes them look "double", set that to low.

It has probably already been mentioned but this is a long thread. Get voice attack! It will make flying in VR so much more enjoyable. You can do virtually anything by voice, flaps up, down, landing gear, targeting, so on an so forth. Then bind targeting to the hotas top hat or if you run something like the X52 to the throttles hotas... makes like a breeze.

Old post, but, the FPS counter in games won't reflect the actual oculus FPS. You need to download the oculus toolkit and enable performance hud. It will be annoying, and in your way, but it is very accurate in the true FPS and dropped frames (which will be many in DCS)

It's just not quite there yet.. I am running a Titan XP (the new Titan with Pascal) and I can't maintain 90FPS with ALL settings set to low. The card doesn't blink hardly with the settings maxed out on Pcars, only if I take the MSAA up to 6x and ALL the settings on ultra will it slow it, at 4x and ultra it is smooth sailing. Same with Prepar3D flight sim, I can virtually max it out. Turning on the camera, or the mirrors, drops the FPS significantly in DCS and provides stutter. It's fun to fly around, but you can bring up the oculus rift toolkit performance hud and you will see it drops frames faster then m&m can spit out the words to rap god. :) Hopefully they will tune/optimize and look into Vulkan or Directx 12.