Random lag-spikes from ExperienceChatMain CoreScript?

[Maximum_ADHD]

This started happening for me in the latest update to Roblox’s client. I’m not sure if it’s happening everywhere, but I’ve been observing these random lag-spikes related to Roblox calling VideoCaptureService:GetCameraDevices() in the ExperienceChatMain CoreScript.

You don’t have to spam-press the chat toggle to reproduce it, sometimes it’ll just randomly happen multiple times a second.

Easiest way to reproduce is to spam open and close the experience chat window:

Here’s a microprofiler dump I captured of the issue:
microprofile-20231206-170751.zip (7.3 MB)

[WheretIB]

Thank you for the report, we are investigating this.

[TypeDummy (TypeRamadan)]

The issue relates to Roblox Face Tracking, and Roblox has yet to resolve it; here’s how any of you can resolve the issue if you’re having it.

1. Open the Windows search bar and type “Manage Cameras”, then you should be directed to your settings.
2. Disable all of your cameras
3. Issue Resolved!

I hope this helps anyone whom it reaches; for more info, here’s a devforum post I made highlighting the bug a couple of weeks ago:

Extreme hanging when loading Assets/User Interface or entering an experience

Information: This issue began within the past week and only affects the game engine. This issue doesn’t occur in Roblox studio or when testing games in the studio. In the video, I have an FPS unlocker enabled. However, I must point out that the issue also occurs when the FPS unlocker is disabled. This issue isn’t hardware-related and is primarily Roblox-related. Every program/game on my PC, such as Overwatch 2 or Blender, works perfectly fine. All the hardware is top of the line with the NVIDI…

[WheretIB]

A fix for this issue should be released next week.

[Mauio64 (Mauio)]

Would like to see this fix come out soon. We just shifted to the new chat system… not a very good first impression.

[OmegaInvictissimus (OmegaInvictus)]

@WheretIB

A fix for this issue should be released next week.

Any updates? My game also just switched to the new chat system and a lot of my players are having large FPS drops due to this, or at least I suspect that this is the same issue. I see experience chat main spiking in the microprofiler, too.

@TypeDummy

here’s how any of you can resolve the issue if you’re having it

My computer doesn’t have any cameras, and so there is nothing under manage cameras for me to disable. Yet, I am still experiencing this issue.

[WheretIB]

@OmegaInvictissimus

Any updates?

The issue with GetCameraDevices has been fixed, we are not tracking this topic for any unrelated issues with new chat.

[be_nj (benjj)]

Can you send or upload microprofiler dumps that show these frames? It would help a lot to diagnose and address the issue

[OmegaInvictissimus (OmegaInvictus)]

microprofile-20240209-154339.zip (7.1 MB)

I just got on my game to see if I could get the experience chat main to spike on my micro profiler too and I got this dump. It looks very similar to the screenshot from Mauio. This is really the first time I’ve ever messed with the microprofiler so I apologize if I’ve done something wrong or am misinterpreting things for another issue, but I hope this might help.

[be_nj (benjj)]

Thanks, what game was this from?

[OmegaInvictissimus (OmegaInvictus)]

No problem
https://www.roblox.com/games/5214778208/A

[Mauio64 (Mauio)]

Chechos Deltarune RP - Roblox
microprofile-20240218-204341.zip (4.0 MB)

[Kepzun]

Thank you all for your patience. Just following up to let you know this issue should now be resolved.

[Lucatacos2213 (Lucatacos)]

Sadly this issue is still happening in version 619

Script_CoreScripts/ExperienceChatMain Very Slow - Bug Reports / Engine Bugs - Developer Forum | Roblox

[BouyertheDestroyer]

@Kepzun @WheretIB @be_nj This bug is still happening for me, too.

Significant frame drop due to GetCameraDevices

I get 1.5 second hangs in GetCameraDevices sometimes as frequently as every few seconds. This is nearly unplayable. [image] These hangs have been happening fairly often for me over the past few months. I’ve only noticed them on my desktop, which has a Logitech C920 webcam. Haven’t ever noticed on my laptops or phone. Also, this only seems to happen during some play sessions. For example a few minutes after that screenshot I joined a different PLS Donate server and had consistently smooth 60 …

[mikoblixel]

i have no idea why but this is also happening, fresh install of windows 11. never happened before???

[mikoblixel]

turns out i had to tweak my nvidia gpu settings a bit, and it worked on fixing this! i think it was low latency mode that i set to off

[Vyntrick (Vyntrickster)]

This same issue has been happening again. Aggressively long Experience Chat lag spikes in Booth Game.

I’ve noticed this occurs in Experiences that use the new TextChatService after extensive lengths of playtime. This problem definitely still occurs.

Spamming the Experience Chat icon in the topbar results in the same lag spiking as well. Lag spike occurs every time a new Chat message is processed and displayed in the Chat Window.