Quest pro, solid 72fps but lots of stutters and juddering.

[Digitalvole]

I’m using a quest pro over a link cable and it’s been great, but today I’m finding it very juddery despite having a solid 72fps. If I bank the plane the horizon jolts and judders (was smooth before) and if I just look out the side at the ground at low level there’s a definite stutter every few seconds. But all the while the FPS reads 72 (via OpenXR toolkit)

I haven’t updated DCS in a while so still on 2.9.2xxxx. 

Up until today all was well. I did  connect a new pair of Bluetooth headphones to my pc today, could that be it? The problem persisted after I disconnected them so it doesn’t seem likely. I also plugged a usb powered strip of led lights into my pc’s usb hub, but it wasn’t plugged in when I was playing DCS, could that cause problems? I’m clutching at straws because it was fine before today and I’m scratching my head.

I’m hopping you guys could give me some suggestions as to what could make this happen so I can start trouble shooting, because I don’t have a clue and it’s making flying quite unpleasant. I have tried Googling this but nothing I can find helps.

[Tomcat388th]

I'm on the latest version of DCS but here are some screen shots of my Q Pro settings with link cable if they help any.  On the debug tool screen it shows ASW as auto but I usually have it disabled. In the open xr toolkit I run CAS  and I throttle my frame rates to 45. Only other thing that comes to mind is do a DCS slow repair and if there was an app for the blue tooth headphones added remove it. 

[Qcumber]

2 hours ago, Digitalvole said:

I’m using a quest pro over a link cable and it’s been great, but today I’m finding it very juddery despite having a solid 72fps. If I bank the plane the horizon jolts and judders (was smooth before) and if I just look out the side at the ground at low level there’s a definite stutter every few seconds. But all the while the FPS reads 72 (via OpenXR toolkit)

I haven’t updated DCS in a while so still on 2.9.2xxxx. 

Up until today all was well. I did  connect a new pair of Bluetooth headphones to my pc today, could that be it? The problem persisted after I disconnected them so it doesn’t seem likely. I also plugged a usb powered strip of led lights into my pc’s usb hub, but it wasn’t plugged in when I was playing DCS, could that cause problems? I’m clutching at straws because it was fine before today and I’m scratching my head.

I’m hopping you guys could give me some suggestions as to what could make this happen so I can start trouble shooting, because I don’t have a clue and it’s making flying quite unpleasant. I have tried Googling this but nothing I can find helps.

Could you please let us know your PC specs? And could you screenshot a view of the dcs fps/frametime overlay? Do you have any other open XR layers active, such as QVFR or XRNS? 

[Mr_sukebe]

Did you check the USB port that your headset is plugged into to ensure that it’s the fastest one available?

Some motherboards seem to have a variety of USB port types, and there are significant differences in bandwidth capabilities.  If you’ve accidentally plugged the link cable into a slower port, that will certainly cause issues (no clues as to how I know this).

[Digitalvole]

On 3/29/2024 at 8:07 PM, Tomcat388th said:

I'm on the latest version of DCS but here are some screen shots of my Q Pro settings with link cable if they help any.  On the debug tool screen it shows ASW as auto but I usually have it disabled. In the open xr toolkit I run CAS  and I throttle my frame rates to 45. Only other thing that comes to mind is do a DCS slow repair and if there was an app for the blue tooth headphones added remove it. 

Thank you Tomcat388th for the suggestions and taking the effort to post your settings. This “phenomenon” has appeared despite consistent good performance up until Friday and no changes to DCS settings. No app for the headphones, and I’ve done a slow repair today, but still getting this weird lag despite low frame times.
 

On 3/29/2024 at 9:09 PM, Qcumber said:

Could you please let us know your PC specs? And could you screenshot a view of the dcs fps/frametime overlay? Do you have any other open XR layers active, such as QVFR or XRNS? 

I can do specs (4090 5900x 64gb nvme) but not sure how to get a screen shot of the overlay, would print screen do it? I’m using quad-views and according to OpenXR toolkit my frametimes are good. I’ve got 7ms for cpu and gpu (just me in a Hornet flying over Georgia)  and it’s still juddering and laggy. I think it’s the quest rather than DCS, unless the fps counter is lying to me (turbo mode is off.) Head movement does not feel smooth when I look around the cockpit. I’ve got some time tomorrow hopefully to look at it again. 
 

On 3/30/2024 at 6:22 AM, Mr_sukebe said:

Did you check the USB port that your headset is plugged into to ensure that it’s the fastest one available?

Some motherboards seem to have a variety of USB port types, and there are significant differences in bandwidth capabilities.  If you’ve accidentally plugged the link cable into a slower port, that will certainly cause issues (no clues as to how I know this).

I did change the port recently and your suggestion reminded me, but nah, problem persists no matter the port and I’ve run the test in the oculus app and they all seem to be about 2.3gbps. I do think the issue is with the Quest rather than DCS though. I did set up my new Virpil gear since last I played without this lag issue, could that be a potential cause?

Thanks for the suggestions, I’ve got sometime tomorrow to try and work this out. I’ll report back if I have any success or beg for more help if I’m at a total loss.

[Tomcat388th]

Its possible it could be something with your Virpil  there are a couple of older post in the DCS Virpil forum where a person had to update their hotas firmware.  Winwing had a similar issue with their software it kept polling the game for info and causing stuttering. At the time most people just made sure the program didn't start and windows startup.

Hope you get it figured out

J

[Digitalvole]

On 4/1/2024 at 1:22 PM, Tomcat388th said:

Its possible it could be something with your Virpil  there are a couple of older post in the DCS Virpil forum where a person had to update their hotas firmware.  Winwing had a similar issue with their software it kept polling the game for info and causing stuttering. At the time most people just made sure the program didn't start and windows startup.

Hope you get it figured out

J

Thanks for the suggestion, I was wondering about that too, but in my search for a solution I updated Windows and now I can’t use my Quest with DCS until the patch that was supposed to be today. Guess I’ve got another week to wait before I can get back to trouble shooting…