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acreed11
Participant
February 11, 2024
Solved

(Not Resolved) Known Issue - Quest PCVR streaming micro lags and stutter esp. when moving head

Hi team,

I'm getting micro lags and stutter in Airlink on my Quest 3 (EU/UK), esp. when moving my head. In the Oculus debug overlay this causes brief spikes in transmit/decode, fps drops and visible stuttering. The issue is not present on my Quest Pro with otherwise identical settings - see below screenshots to illustrate.

Few more details:
- Issue is not present on Quest Pro with same settings on HMD, router and PC (using same res)
- Issue is worse at higher bitrates, esp. >200mbps, but still present <200mbps
- Issue is unrelated to PC/game latencies (CPU, GPU, Queue each <5ms)
- Stutters/lags are intermittent (every 10-20 seconds) when not moving but happen immediately and reproducibly when moving the head to either side or especially looking downwards (i.e. on any bigger headset movements)
- Wifi 6E router (TP Link AXE75 EU/UK)
- EDIT: exact same issue with Asus RT-AXE7800 (EU/UK) wifi 6e router
- Connection shows as 2,400mbps
- Airlink codec H264 (but same on other codecs)
- I've attempted factory resetting, installing latest drivers
- Updated to v62 and latest Quest Link desktop version (I can see the 120hz option for my Q3)
- EDIT: Ordered a separate Quest 3 for testing: presents the exact same issue

-EDIT: Same issue on 5ghz 802.11ax 160mhz BUT switching to 802.11ac (!) completely fixed the issue. I cant test this on 6ghz but looks like 802.11ax or something related to how q3 implements it is the culprit

As the issue is worse the higher the bitrate and not present on Q Pro with otherwise same settings, I suspect it's related to the below known Wifi issues - but opening a new thread as instructed. 
https://communityforums.atmeta.com/t5/Get-Help/Known-Isssue-Unstable-wifi-coverage-with-Quest-3-on-some-Router/td-p/1090698

Best,
JensQ3QPro

Updates:
- Tried separate router: exact same issue with Asus RT-AXE7800 wifi 6e router
- Ordered a separate Quest 3: exact same issue on both routers

-Same issue on 5ghz 802.11ax 160mhz BUT switching to 802.11ac (!) completely fixed the issue. I cant test this on 6ghz but looks like 802.11ax or something related to how q3 implements it is the culprit

    TheAntiSocializer
    TheAntiSocializerAnswer
    Honored Contributor
    February 25, 2024

    Hey everyone! Thank you so much for the information you've all provided.

    If you have not already done so already, I would suggest reaching out to the support team via email so that they can gather a copy of your logs.

    If you have already reached out to support and provided your logs, please PM MetaStoreHelp with your case number.

    EDIT 8/5: Hey everyone! Just wanted to reach out and thank you all for your continued patience. If you're still having some issues, the best thing I can recommend at the time would be to submit a bug report. That way it can go straight to our engineers for them to further review everything provided. Thanks again!

    Sometimes it's okay to be a little Bing Chilling
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    442 replies

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    DeKCoH
    New Participant
    February 17, 2024

    The same problem. Sometimes it's okay, sometimes it's not. I set 500 Mbps and not a single stutter (in rare cases). But most often it stutters even at 130 Mbps. Router ax73 5400

    rmzalbar
    Inspiring
    February 17, 2024

    https://communityforums.atmeta.com/t5/Get-Help/Poor-Q3-Airlink-Performance-on-V62/m-p/1152364#M274523

    Throwing in on this, we have the same problem and it's exactly as OP describes. We have three VR PCs and Q3s in the house, and our game night plans this week were unfortunately hosed. V60 gave us no performance issues at all. We fell back to Breachers on native and had fun, but guys! We invested in this and we need it working!!

      Galatoni
      Participant
      February 17, 2024

      Can confirm. Was fine until this update - now unplayable. PC is fairly high spec, using Orbi system, I'm highly doubtful its the network or wifi since this was fine until the update.

      MetaStoreHelp
      MetaStoreHelp
      Community Manager
      February 17, 2024

      Hey there, everyone! Thank you for sharing your experiences while connecting to PCVR using Air Link after our most recent update. We definitely want to take a further look into this concern, and we ask that everyone please submit a bug report for our team to review! 

      As we continue looking into this concern, we do want to make sure the following have been completed: 

      • Re-Pairing Air Link 
        • Completely disabling the functionality on the device. To do so, head over to the device settings and ensure Air Link is disabled/toggled off. 
      • Hard Reboot the headset 
        • This can be completed by holding the power button down for 30 seconds or from within the device's Power Menu. 
      • Ensure all PC and GPU drivers are fully up-to-date. 
      • Run a Repair on the PCVR app
        1. Download and run the PC Installation Software
        2. You will see a screen which says "Already Installed".
        3. Click the "Repair" option, and confirm again on the next screen.
      • If able to test, please verify if stuttering/lag is seen with a Link Cable connection. 

      With these details, we'll work together to get to the bottom of this! 

      If you're the author of a thread, remember to mark a reply as the Accepted Solution to help others find answers!
      Galatoni
      Participant
      February 17, 2024

      I've completed the steps above. I can confirm that this appears to be limited to the airlink rather than Link cable set up. To confirm, this issue was not present in a previous update.

      I'll not be able to provide any additional assistance as i've used all my available free time attempting to debug this issue, so i'll not be about until next week now.

      Digipro
      Up and Coming
      February 18, 2024

      yes i am suffering similar with airlink virtual desktop works fine most of the time even at 500mps  i usually run at 300-350 but mostly 300 with the rtx 3070. in oculus airlink the defualt pcvr home menu is laggy espeially when trying to view the desktop within it to launch games from vr. just stutters and lags doing about 2 to 3 fps sometimes lower it can take ages for th screen to refresh making it virtually a 5 minute task to line the controller up to choose the exit menu . same in vr games it can just suddenly start messing up lagging when  looking left and right into corners , virtual desktop i can get good play time out of it but only on 5ghz my 6g will only connect at 1200mbs for some reason it did use to connect at 2400 but was as laggy as the 5ghz at 2400 if not slightly more . and i am confused some places it says wifi 6 others it says wifi 5 so i am on wifi 5ghz channel and it shows its wifi 6 but i have my wifi 6 disabled as its triband router ( experimenting with one or the other or both trying to see if i can improve signal) 

      alexlighthill
      Participant
      February 20, 2024

      I have the same problem and I am curious if it can be fixed with another router. My WiFi speed is stable, shows 2401 mbit connection, I tested local network speed using open speed test hosted on my PC and starting speed test from browser on quest 3, it is always 900+ mbit. But I get a lot of video jerking when I move/crouch in my headset, I dont' have this problem when I just rotate my head, without moving.

      Also I've discovered that this problem is less pronounced if I set WiFi to AC 160mhz instead of AX 160mhz. Max speed is around 1700mbit in this mode instead of 2400, but overall experience is noticeably better.
      So, here are my tests, both with 300 mbit bitrate set in ODT, look at top left green graph:

      AX 160mhz mode: https://www.youtube.com/watch?v=XKCqDcXcwBQ 

      AC 160mhz mode: https://www.youtube.com/watch?v=L9XdEKO2Seg 

        D3ft0ne
        Participant
        February 20, 2024

        Same issue here, I had submitted bug report in Oculus / Meta app.

        Both - Oculus App and HMD at v62 (This issue started when HMD updated)

        - 

         - 5800x3D
         - RTX 3080
         - 32GB RAM 
         - Windows 11

         - tp-Link AXE5400

         

        ---------------------

        Changing Air Link codec between H265 / H264 doesnt make any diff. Changing bitrate doesnt make any diff.

        Issue happens in less demanding games, like HL2VR (via Steam VR), or Beat Saber - via Oculus App....

        Constant decoder jitters - every 15-20sec.  where it drops from 90 to 75 or 80 fps /hz , more pronounced with more action in games.

        NO such issues with V60 on HMD.

        VirtualOmnipresence
        Up and Coming
        February 21, 2024

        I also finally received the V62 update for Quest 3. I'm the one who recorded the video below for the old Wifi issues thread. I just re-did the test today and the issues are still occuring pretty much the same (I don't see any measureable improvement, more details below). The video compares wifi packet loss of Quest 2 V56, Quest 2 V57 and Quest 3 V59 (for further details, please see video description on Youtube): 
        As said, today I re-tested this with various routers. I even purchased the expensive ASUS ROG RAPTURE GT-AXE1600 which was recommended here on the forums. Unfortunately it also has pretty much the same packet loss like the cheaper TP-Link routers. I tested 5GHz and 6GHz with 6GHz Wifi performing worse than 5GHz (higher packet drop). I also tried enabling/disabling beamforming and tried various WiFi channels. The issue happens every time as soon as I move around.

        @MetaQuestSupport if possible, please forward this to the developers. Thanks 🙂

          acreed11Author
          Participant
          February 21, 2024

          Extremely helpful, thank you. MetaStoreHelp echoing that - please forward these to the devs 🙂

          Interestingly the issue seems to be less pronounced on Virtual Desktop vs. Airlink. For your tests, what level are you measuring packet loss at?
          Wondering whether the packet loss is just better compensated and therefore less noticeable in Virtual Desktop OR whether it occurs less there, e.g. because the headset runs in a different mode in when Airlink is on vs. in a user mode app like Virtual Desktop.

            VirtualOmnipresence
            Up and Coming
            February 21, 2024

            Thanks. I'm not using Airlink or Virtual Desktop. It's a local multiplayer game that sends UDP packets from the game server (a PC) to the HMDs to synchronize the game states. The packet loss is measured by the networking engine of the game. Basically each packet sent from the server to the HMD has a incrementing number. If you receive a packet with number 5 and the next packet you receive has number 7, you know you lost 2 packets in between.

              D3ft0ne
              Participant
              February 21, 2024

              I tried to turn off new WiFi interface, with it On or Off - I get the same lag spikes. 

              I am attaching Beat Saber video to show this behavior exactly - look at the decoder spikes goes from 90 to 84 / 84 ... every like 10 sec.

              This started with v62 - it was rock solid at v60.  I have it set to H264, 400Mbps - fixed. 

                alexlighthill
                Participant
                February 22, 2024

                I've discovered that MSI Afterburner with RivaTunerStatisticsServer cause some framerate drops, but still it is not the main problem in my case.

                  D3ft0ne
                  Participant
                  February 22, 2024

                  Ya I never have that enabled when using Air Link or VD. Hoping for the fix sooner than later, since the issue is very obv. For now VD at least works way better.

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