Hi,

One of the last versions of X-Plane (between 11.51r1 and 11.52r1) introduced a weird input lag in Vulkan mode. It is hard to describe, but basically causes camera movements to be delayed compared to mouse inputs, even when FPS is rather high. It is quite disorienting and causes perceived FPS to be really low. Basically it feels like persistent and long stuttering.

It only happens in Vulkan mode, even with a completely vanilla installation. OpenGL works perfectly fine. Lower FPS seem to make the situation even worse, so add-ons like xEnviro pretty much make Vulkan mode unusable.

Do you have that issue too? My graphics driver is up-to-date and every other graphics intensive application/game is working normally.

Thanks in advance.

Edited February 25, 20215 yr by BiologicalNanobot

This does sound like some "camera plugin" at work - those that emulate the head moving in moving aircraft, there is also a native setting "cinema verite" that adds some camera shaking...

39 minutes ago, Janov said:

This does sound like some "camera plugin" at work - those that emulate the head moving in moving aircraft, there is also a native setting "cinema verite" that adds some camera shaking...

I don't have any camera plugin, it happens in a completely vanilla setup too. Cinema verite is disabled, and it really doesn't feel like a camera effect but more like stutter.

windows?

apparently the dec update and latest windows nv drivers have issues.

https://developer.x-plane.com/2021/02/x-plane-11-52r1-released/

Quote

Drew says:

February 17, 2021 at 9:58 pm

For those who are still getting stutters and tears please try these tips. I was getting really bad stutters with the 2d and VR environment using a hp reverb g2. These 4 things have really helped in xplane.

1. When using VR try and disable the virtual monitors in with a reg key. this made a huge difference in performance. example is seen here:
//forums.flightsimulator.com/t/psa-wmr-advanced-registry-setting-might-help-getting-better-performance/333375

2. Uninstall the geforce experience tool. I found this also slowed things down with the overlay/streaming options

3. Disable or uninstall the xbox live features and overlays in windows. This made a difference as well

4. play around with your nvidia drivers. in my case i had to roll back to earlier version that were more stable. 

5. try turning off superfetch and prefetch in the registry and turn off the sysmain service. 

Xplane has been running really well since then applying those changes.

michel says:

February 19, 2021 at 6:52 am

i am a oculus vr user.
suddenly stutters were back again after a huge windows 10
update, end of nov/start dec 2020.
(even with all graphic settings to min.)
rolled back windows 10 update to previous one and all back to normal.

second I did was rolled back nvidea driver to 442.59.
that gave me a 10% fps increase.

both, thanks to a helpful forum member (after reading 99% of nonsens….)

goodluck

Ive been getting the tears on their linux drivers to, new version released today I'm just about to try.

Input lag is generally OS driver related,

but aside from the ssao bug in VR that has me raging, XP never been better for me.

Edited February 25, 20215 yr by mSparks

Can you try by deleting the Shadercache and .prf ?  Hope it's not any addon / aircraft causing an issue. Also check your plugins. 

But I suggest deleting those.

 

1 hour ago, HumptyDumpty said:

Can you try by deleting the Shadercache and .prf ?  Hope it's not any addon / aircraft causing an issue. Also check your plugins. 

But I suggest deleting those.

 

It happens on a vanilla setup too - sadly deleting shadercache and options didn't help either.

1 hour ago, mSparks said:

windows?

Yes.

I don't use VR, but I will try to uninstall NVIDIA stuff and apply other tweaks - I hope it helps.

8 minutes ago, BiologicalNanobot said:

It happens on a vanilla setup too - sadly deleting shadercache and options didn't help either.

Hmm then GPU ? maybe ! can you enable the Frame counter and then check what it shows during the stutter ? Probably get an idea

54 minutes ago, BiologicalNanobot said:

Yes.

I don't use VR, 

my guess would be you recently got the december windows update (or maybe a new one, try recalibrating your controls in windows or rolling back to an earlier time. or apply updates if there are still pending) - its a usb issue aiui.

VR was hit by the recent nvidia driver regressions because its so sensitive to stutters and reduced perf, which is why you see us complaining more than others (who can likely live with it, all the msfs guys seem to), but also because the head tracking comes over usb.

just got new nv drivers today (linux anyway), looks like they may have fixed a lot of their issues, but only done a half hour flight or so.

Edited February 25, 20215 yr by mSparks

Hi, I still get this issue now. Has anyone found a fix for it?

Yeah LR is probably hard at work to get it fixed , Greazer will be testing it.

10 hours ago, devruh said:

Hi, I still get this issue now. Has anyone found a fix for it?

@Greazer, rka  and others:  Instead of being a smart word not allowed, why not try to answer and be constructive for once?

As discussed, This could be caused by a multitude of things. Is this also happening with the default Cessna?

first on the list: what graphics card and drivers are you running? Try others drivers, if possible. Disable (or enable) Vulkan from within X-Plane then restart.

second: what plug-ins do you use? Try removing them…

are you running too high settings? Like running out of memory (try checking both RAM and VRAM). Try lowering the number of objects and check if your issue is still there.

 

Any more smart Alec replies to this topic will result in some enforced holidays. Why can’t you just behave in a sensible manner? You’re not children!

1 hour ago, soaring_penguin said:

@Greazer, rka  and others:  Instead of being a smart word not allowed, why not try to answer and be constructive for once?

As discussed, This could be caused by a multitude of things. Is this also happening with the default Cessna?

first on the list: what graphics card and drivers are you running? Try others drivers, if possible. Disable (or enable) Vulkan from within X-Plane then restart.

second: what plug-ins do you use? Try removing them…

are you running too high settings? Like running out of memory (try checking both RAM and VRAM). Try lowering the number of objects and check if your issue is still there.

 

It only happens when running Vulkan, on OpenGL I didn't have these issues. I would assume it would be something with drivers, even though I've had this with multiple different versions. I'll check during a flight for my RAM and VRAM. Its odd though it happens at around 45FPS which is solid but it makes it feel as if I'm running at 25-30.

I will also take a look at plugins now.