FPS "stuck" at 44

[mazex]

Just got myself an RTX 2080 as an early Christmas gift to myself

 

Started up IL2 that I have not played for a while with my Vive hoping to see a good improvement over my old GTX 970 that was really to weak for VR. My CPU is an i7 4790k so that should be my weak link now...

 

But running IL2 I get some strange behaviour. I had the Graphics set to Ultra with "extra all" after trying non VR in some situation. I realized that the FPS counter playing a mission over Kuban is almost "stuck" at 44 FPS. Sometimes it can drop for a second or two down to 43 or even 39 for a few milliseconds when crashing or similar - but the game feels super smooth.

 

So - I thought that some setting blocked me and to get a fresh start I deleted my startup.cfg to get a clean new one. Set it to high and disabled SSAO and some other stuff that was on before. And I get the same behaviour... 44 FPS 99.9 % of the missions. Looking up, flying through tree corridors - whatever. But it feels super smooth...

 

So - my monitor is running at 144 Hz (with Gsync). Could it be that it really is 144 FPS instead? Would not think so but as i NEVER EVER get above 44 FPS the thought occurred. Feels like something else is capping at 44. Looking at the CPU while gaming it does not look hogged at all.

 

Any one that have any ideas? 

 

From my startup.gfg now:

 

[KEY = graphics]
    adapter = 0
    bloom_enable = 0
    desktop_center = 1
    detail_rt_res = 1024
    draw_distance = 1.00000
    fps_counter = 1
    fps_limit = 0
    full_height = 1440
    full_width = 2560
    fullscreen = 1
    gamma = 1.00000
    grass_distance = 100.00000
    hdr_enable = 0
    land_anisotropy = 0
    land_tex_lods = 0
    max_cache_res = 1
    max_clouds_quality = 2
    mgpu_compatible = 0
    mirrors = 1
    multisampling = 2
    or_enable = 1
    or_height = 2376
    or_hud_rad = 1.50000
    or_hud_size = 0.75000
    or_ipd = 0.06520
    or_width = 2138
    post_sharpen = 0
    preset = 3
    rescale_target = 1.00000
    shadows_quality = 2
    ssao_enable = 0
    stereo_dof = 5.00000
    vsync = 0
    win_height = 1440
    win_width = 2560
[END]

[=EXPEND=Tripwire]

Being 'stuck' at 45fps means that you are constantly in reprojection.

 

Either something in your PC is causing performance issues or your reprojection settings are misconfigured in SteamVR. Eg. Always On Instead of asynchronous?

 

Also setting the graphics presets to Ultra will be too much for your PC in VR. That's the most likely cause.

[chiliwili69]

You can put all settings to minimum and run a very simply quick mission in Lapino.

 

You can review this checklist:

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

 

You can run the test:

https://forum.il2sturmovik.com/topic/29322-measuring-rig-performance-common-baseline-for-il-2-v3007/

 

You can also do overclocking, your CPU is the bottleneck :

https://forum.il2sturmovik.com/topic/29881-overclocking-a-4790k-for-better-bos-performance/

 

[Muff_Huggar]

Some Steam VR stuff rolled out of beta and into the regular stream this week. I believe the reprojection and smoothing stuff is now on by default. The new stuff doesn't apply to my Vega 64, so I still see jumps from about 1 FPS (yes, 1) in the main starting menu to 90 in game but it tends to hover around 45 anyway, especially if the HUD is on. I tried Low, Balanced, High and Ultra and saw little difference in either of those. I noticed a little stutter in Ultra while drawing the landscape in the distance. 

[mazex]

Thanks a lot guys for all the advice!

 

On a business trip right now but I will check this out on Sunday. I don't remember any reprojection settings when messing around previously in Steam VR and I am on a business laptop now so I can't check.

 

The weird thing for me is the fact that it is so "glued" to 44... I agree with Tripwire that Ultra is way "to much" - the strange thing is that Ultra with SSAO, HDR etc on gave me 44. And "High" with a bunch of things off was still glued at 44. Even though  my 4790k that is the major bottleneck now like Chiliwili agrees on (will certainly check the guide) - it should at least sometime go to 45 or above at SOME low load part. But it NEVER goes above 44 , even for a second. And almost never below  Feels like that reprojection setting messing around...

 

But - having said this it still feels really smooth strangely enough - no stuttering at all and it looks great. Maybe it's me that is used to my 970 GTX that was more in the 35 FPS domain...

[Alonzo]

21 minutes ago, mazex said:

The weird thing for me is the fact that it is so "glued" to 44... I agree with Tripwire that Ultra is way "to much" - the strange thing is that Ultra with SSAO, HDR etc on gave me 44. And "High" with a bunch of things off was still glued at 44. Even though  my 4790k that is the major bottleneck now like Chiliwili agrees on (will certainly check the guide) - it should at least sometime go to 45 or above at SOME low load part. But it NEVER goes above 44 , even for a second. And almost never below  Feels like that reprojection setting messing around...

 

If you have the supersample set too high for your GPU to achieve 90 FPS (let's say it was able to do 80) then you'd see this behavior. Ultra/High/Balanced certainly do change the GPU load but I think the bigger effect is CPU.

 

I've seen loads of problems with SteamVR not setting the supersample to where a user *thinks* the supersample should be. With the Rift, you can use the debug tool and then have a HUD in the headset that shows you the actual pixel density. Anyone know if there's an option for this for Vive/SteamVR?

 

If I were you I would start at Balanced settings, Medium shadows, 0x AA in-game, force 100% supersample through SteamVR, and see how it is. Then slowly increase settings. For reference, with my Rift + 2080 + 8086K@5.0ghz I am running 1.2 pixel density for the supersample, which would correspond to 144% in SteamVR, alongside 4x AA in-game.