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[REPORTED] significant FPS drop just after landing in VR


Helios1138

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I also have this same problem after the first 2.5.6 update. Happens only with hornet and only thing whats helping after the stutter starts is to restart DCS. Problem doesn't exist at carrier.

 

 

What have i done:

 

-Updated windows

 

-Updated nvidia drivers

 

-Deleted metashaders and fxo

-Used "repair" function of the dcs_updater

 

 

system specs: i5 9600k@5ghz, asus 2080super oc, 32gb ddr4, 1tb ssd, hp reverb glasses

landing_stutter.trk

landing_stutter_readyontheramp.trk

DxDiag.txt

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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Then this might be two different things because i didn’t have any problems with 2.5.5. If necessary, mods can separate these for two reports.


Edited by divinee

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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Yeah this one sounds odd as I can fly long stints in MP using the Oculus Rift S and have no problems what so ever. The only problem I can see from the Rift S is occasionally it will go into a constant stutter mode but I can exit DCS and still see that at the home screen so it isn't a DCS issue but an Oculus one.

 

Perhaps a 2.5.6 new issue as I've not flown OB since the 2.5.6 update due to the issues it's had.

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Made some more testing and noticed that after landing, the stutter starts at the halfway of runway. Same thing online or offline and only with hornet. I checked with fpsvr and when the stutter starts, gpu frametimes go to something like 60ms from 20ms. Cpu frametimes stay normal ~20ms. If i change to spectator after landing and look straight up to sky cpu frametimes drop to about 10ms and gpu frametimes stay at the 60’s.

 

Edit: As long as i stay airborne i dont have any problems. I can run very long stints and game runs very smooth

 

 

Edit2: I made a youtube clip about this. As you can see, something happens when rolling on the runway. Frametimes slowly go from 20 to 60. What i didn't notice before was that the cpu frametimes also go to ~40.


Edited by divinee

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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Same issue here with HP Reverb. Drops ~ 20 - 25 FPS at Batumi airport and at other airports as well. :mad:

Hardware:

Asus ROG Strix X-570-F | AMD Ryzen 7 5800X3D | Asus GeForce RTX 4090 TUF Gaming | Kingston Fury Renegade DDR4-3600 CL16  64 GB | Corsair HX850i | Samsung SSD 980 PRO 500 GB M.2 | Kingston A2000 1TB M.2 | BenQ LCD BL3201PT | HP Reverb G2  | Loogitech G700s | Loogitech MX Ergo | Winwing F/A-18 H.O.T.A.S | TekCreations F18 Hornet Right Replica Panel | Thrustmaster Hotas Cougar FCC | Thrustmaster Pendular Rudder | SimShaker JetPad |

Software:

Windows 11m Home x64 ver.22H2| SteamVR | VoiceAttack | FPSvr | SimShaker for Aviators Beta ver. 2.6.1.0 |

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I bought the Hornet module over the weekend (Steam version, if it matters) and I'm seeing this behavior as well, in addition to some other odd quirks. Frankly, given how much the modules cost, it left a pretty nasty taste in my mouth - enough I almost returned it.

 

Here's what I'm seeing:

1. It seems that I have to go delete the metashaders/fxo files EVERY time I want to play the game, or I get horribly low framerates whenever I look forward. Subjectively, it seems like maybe it's related to the HUD, or some other instrument in the cockpit, as it gets a little better if I look to the left or right.

2. The problem comes back, deleted metashaders/fxo or not, after I land the Hornet. Again, it's the worst looking forward through the HUD, and mostly goes away if I look away.

 

Hardware in question:

RTX 2080 Ti

Core i9 9900K

16GB of memory @ 3000MHz

HTC Vive Pro

 

Settings in SteamVR are the defaults. Settings in DCS are basically just the VR preset, but with all the shadow settings turned down to the lowest option.

 

Edit: I didn't have a ton of time to troubleshoot this, so I can't be 100% it's limited to the Hornet, but the only thing that changed over this weekend, as far as I know, is that I bought the Hornet module, and I've never seen it do this in any of the other airplanes.


Edited by TheChafing
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I'm getting the same thing, I think it is to do with the statics at the airfield (hence not happening on the carrier) also if AI are present on the airfield either uncontrolled or not. Hornet statics and C130 Statics cause the greatest hit on my system.

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I'm getting the same thing, I think it is to do with the statics at the airfield (hence not happening on the carrier) also if AI are present on the airfield either uncontrolled or not. Hornet statics and C130 Statics cause the greatest hit on my system.

 

Statics being... planes just sitting there on the ramp, being used as scenery?

 

In my case, there were zero other planes in the mission. It was literally just me, in a clean-configured Hornet, going for a joyride. This was on the Nevada map, taking off and landing at Groom Lake.

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I also tried with clean mission, both Persian Gulf and caucasus and still had fps drop..

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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I get random stutters with the Rift S. They last a half a minute to a minute and then clear. It is sort of like the bad stutters experienced around the carrier with the initial 2.5.6 release; just less intense.

 
 

Alienware New Aurora R15 | Windows® 11 Home Premium | 64bit, 13thGen Intel(R) Core(TM) i9 13900KF(24-Core, 68MB|  NVIDIA(R) GeForce RTX(TM) 4090, 24GB GDDR6X | 1 X 2TB SSD, 1X 1TB SSD | 64GB, 2x32GB, DDR5, 4800MHz | 1350W PSU, Alienware Cryo-tech (TM) Edition CPU Liquid Cooling  power supply | G2 Rverb VR

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I'm getting the same thing, I think it is to do with the statics at the airfield (hence not happening on the carrier) also if AI are present on the airfield either uncontrolled or not. Hornet statics and C130 Statics cause the greatest hit on my system.

 

Well if it is a too many statics at an airfield yes you can see that in VR regardless of version. Only happened to me at certain airfields at certain locations. Not a general lag every time regardless.

 

I also was helping a friend with a 2.5.6 OB server but there was only a carrier to land at and definitely didn't have any lag after landing bug there. Just the failure to hook up to the shuttle bug that is already known for beta.

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I made some more testing yesterday. I updated windows and nvidia drivers to latest versions which didn't help. Also tried with no mirrors and didn't notice any difference.

Then i made belly landing and didn't have any noticeable fps drop. So the issue is possibly somehow related to landing landing gear touching the airfield.

 

 

EDIT: If i land gears down to the side of the runway on the grass, the fps drop does not occur.


Edited by divinee

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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I still have this same problem with the latest OB update

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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Running DCS with RIFT S.

 

I’ve been experiencing an FPS drop after landing and decelerating below approx 80 kts.

 

I get a steady 40 FPS until that point at which my frames halve.

 

Updated to latest build today - problem still exists

 

I ve been testing F/A-18C instant action, Nevada “free flight” and landing at Creech. There are no AI assets etc.

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  • 2 weeks later...

No improvement after latest beta update. If there is something i can do to get more data about this issue, let me know. I’m more than happy to help if it helps to get my favorite module playable again.

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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Good morning all.

 

Thanks to the person who reported this problem with the F18.

 

I don't play in VR however I also have this bug. I go from 50FPS in the cabin to 15 FPS once the plane stops.

 

Good luck to all the ED team.

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Hi all,

 

I believe this may be related to some of the experiences here.

 

I just spent the last hour and a bit doing some single player take off and landings at Al Minhad to see if I could replicate the huge frame loss that occurs when you have a bit of regular traffic at an airfield. I started each session as a cold start F16 and cold start F18 on ramp. No mods are installed. The only variables changed between each session were airframe (F18 or F16), the quantity of take off and landings and wake turbulence on and off. I tried to keep all take off and landings as uniform as possible to limit and uncontrolled variation.

1st:

I flew a clean F16 in VR with wake turbulence on. There were no other objects or AI in the instance. On instance start I had good FPS with no ASW (Async spacewarp) artifact. I found that after 4 take off and landings (landing runway 09 - takeoff runway 27) I experienced noticeable frame loss and ASW artifact only when my POV was toward the centre of the runway/airfield. On the 5th take off and landing I noticed severe frame loss and ASW artifact (easily frame rates less than 15fps)again only when my POV was toward the center of the runway/airfield.

 

 

2nd:

I flew a clean F16 in VR with wake turbulence off. There were no other objects or AI in the instance. On instance start I had good FPS with no ASW (Async spacewarp) artifact. I completed 8 take off and landings (landing runway 09 - take off runway 27). There was no change in frame rate and no inducible ASW artifact.

 

3rd and 4th:

I repeated the exact same methods using the F18 and experienced the same results respectively.

 

My specs:

16GB RAM

i9 9900K CPU

GTX 1080

Oculus CV1

DCS install on 1TB m.2 SSD

 

I think a good portion of the frame loss people are experiencing is due to the turbulence calculations constantly going on in the background sim. As there are more and more turbulence streams enacting on one another the calculations needed to effectively simulate the movement of the air gets overwhelming for the CPU. The same is experienced when large quantities of aircraft fly the same orbit for a few minutes.

 

Perhaps a 'time slider' for the lifetime of the wake turbulence would be useful?

 

Hope this helps, Thanks ED for all the hard work :)


Edited by Tailgater
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I noticed at the weekend that fps drop possibly occurs only when using wheelbreaks after landing. I'm not 100% sure and i will make some more testing.

 

 

My testing has been without wake turbulence, online and offline.

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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Just just jumped on to try and reproduce and I think you may well be right divinee. I just did a few TO and Landings at Nellis going nuts with the toe brakes with wake turbulence off. Started off with perfect FPS. After 2 landings and alot of braking the FPS had tanked. I kept going and ended up hitting average 5 FPS when ever looking toward the runway brake marks.

 

16GB RAM

i9 9900K

GTX 1080

Oculus CV1

1TB m.2 DCS install

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I had time to make more testing and i can confirm now that the fps drop happens only when using brakes. If i take off and land again the fps drops even more. For me the fps drop still happens whatever direction i’m looking at and only thing what restores the situation is restarting the mission. Weird thing is that only gpu usage is going up and if i don’t touch the brakes i can keep a steady 45fps in freeflight quick mission.

http://dcsfinland.fi/

Dcs: F/A-18C, F-16C, F-14, A-10C, A-10C II, AV-8B, MiG-21bis, M2000C, C-101, AJS-37, F-5, MF1, Bf-109K4, AH-64, UH-1, Ka-50, Mi-24, FC3, SC

System: i5-13600k@P58,58,57,57,56,56/E45 Asus TUF 3080Ti OC 12gb, 64gb DDR5 5600cl32, HP Reverb G2, Virpil WarBrD, Warthog throttle with deltasim slew, MFG Crosswind, DIY ”UFC”, 3x TM MFD’s

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