Poor performance in VR with a "good" system - not sure what I'm doing wrong?

[maxs]

Hey all, I'm not able to maintain 90fps in my Oculus CV1, it consistently drops to 45fps any time I'm in range of other planes / close to the ground etc. This is true in both quick mission and in Career mode, though I would really like to play this game in Career, so maintaining 90fps there is the goal.

 

My system specs:

 

Intel Core i9 9900K 8-Core 3.6GHz (5.0GHz TurboBoost)

ASRock Z390 Phantom Gaming-ITX/ac

Memory: 16GB CORSAIR VENGEANCE 3000MHz (2x8GB)

NVIDIA 11GB GeForce RTX 2080 Ti Founder's Edition

 

 

Il2 Settings: Balanced

 

Resolution: 800x600

Shadow Quality: Low

Mirrors: Off

Distance Landscape Detail: x2

Horizon draw distance: 70km

Grass Quality: Normal

Clouds Quality: High

 

Antialiasing: 4

 

Vsync, SSAO & Distance Buldings: Off

HDR, Sharpen & Use 4k Textures: On

 

SS not enabled

 

****

 

I'm really surprised by the performance - would appreciate any help or insight! I'm launching IL2 BOS via Steam VR (I bought the game through steam).

 

Edited January 5, 2020 by maxs

[chiliwili69]

That´s really strange.

 

With that system and those settings you should be 95% of the time at 90fps without ASW.

 

If I were you I would run the Remagen Benchmark just to be sure that your system delivers the expected performance just in monitor at 1080p.

 

You can also verify some of the points of this old (but still valid) post:

https://forum.il2sturmovik.com/topic/34107-items-to-review-if-you-have-low-performance-in-il-2-vr-test/

 

[dburne]

If you are running that 9900k at stock, you have several cores running at 3.6 GHz. That is likely the issue.

IL-2 will move the threads across all 8 cores, so it is just not using the 2 that are at 5.0 GHz turbo. It will be bobbing 5.0 GHz- to 3.6 GHz back and forth.

 

I would suggest:
1: Disable HT (Hyper Threading) in the bios, IL-2 gets no benefit from it and it will give you some headroom core temp wise.

2: Set each core to 5.0 GHz manually. Test with a stress test utility ( I use Intel Extreme Tuning Utility) stress test, see if it will run 30 minutes and pass, keeping an eye on core temps). If it doesn't or windows crashes add a small amount of vcore manually. If the cores  start to get to 85c+ back off. Most 9900K processors can easily achieve 5 GHz on all cores with decent cooling.

3: Reduce AA to 2x. You are not going to see much difference in VR and it is less taxing on the CPU.

 

Hope this helps and good luck.

 

 

 

 

 

 

[FTC_horsky]

I run the same cpu as you, stock, though with a 1080ti, 32gb ddr and riftS.

 

When I first started out I was baffled by the poor performance in il2, tried everything back and forth.
I switched to open composite from steam vr and game runs like a charm with asw off. In steam vr and ott

I had to have asw on to maintain some form of visual fidelity, but ghosting was killing it, my recommendation

is to try open composite and what dburne suggested, I myself havent thought of disabling HT, but makes totally

sense, wherever one can benefit from a performance boost one should take advantage of everything.

 

Hope it helps, which I think it will.

 

 

 

 

[von_Tom]

 

Turn off the frame reducer thing that automatically drops you to 45 when you cannot maintain 90.  ASW I think.

 

With that off you should get drops from 90 but not down to 45.

 

von Tom

[Alonzo]

On 1/5/2020 at 2:08 PM, maxs said:

Hey all, I'm not able to maintain 90fps in my Oculus CV1, it consistently drops to 45fps any time I'm in range of other planes / close to the ground etc.

 

First off install OpenComposite (bypass SteamVR for extra performance). Then install Oculus Tray Tool (OTT) for extra options. In OTT, set default super sampling to 1.0, default ASW to "off", and Visual HUD" to "Pixel density". Then run the game. Put on the headset. It should say "pixel density 1.0" -- if not, something has gone wrong. Then set HUD to "application render timing" and run a mission. The HUD will tell you which part is slow -- for 90 FPS you need both CPU and GPU frame time to be under 11ms.

 

From here you can see what's the slow part, and tune and adjust your settings. For a 2080ti / 9900K / Rift CV1 I would expect you to be able to crank the settings at least to High, 4xAA, 1.2-1.3 pixel density. Be aware that sitting on the ground is a lot more intensive than being up in the air, lots more to draw. So try it out in different scenarios as you do the tuning.