CPU Lag Spikes in *any* Roblox game

Bug Reports Engine Bugs
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1

Seems to be a continuation of this post from a few months back which was subsequently closed and marked as resolved. Despite this, as of recently I’ve experienced elevated CPU usage from Roblox (+ Studio). This happens on all games including empty baseplates.

Detailed MicroProfiler (zoomed to show points where the lag spikes occur) + MP dump

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microprofile-20250915-150301.html (5.0 MB)

Fully aware my computer specs aren’t the best, however, this has only just started happening within the last few days. I usually sit at around 17ms of CPU time, however, spikes see it jumping anywhere from 100-150ms.

Windows 11 Pro 64-bit (Build 26100)
Intel (R) Core(TM) i7-6700 @ 3.40GHz (8 Cores)
32GB DDR4 RAM
NVIDIA GeForce RTX 4060 (8 GB)

Any help would be much appreciated, although these spikes only last less than a second, it’s still visible and does my head in! :smiley:

2 Likes
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Still facing this issue! Any help would be great :slight_smile:

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Without looking too closely, I don’t know the exact reason you are getting these lag spikes. It may be Roblox related, but what I will say is:

  • You are running Windows 11 on an unsupported CPU
  • Your CPU is over 10 years old
  • The lag spikes in the MicroProfiler don’t point to anything specific.

Are you monitoring your PC temperatures? Are you getting lag spikes in games outside of Roblox?

I’d say do some benchmarks and rule out your hardware being the problem.

1 Like
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It looks like the “Sound” task is part of the spike. This bug may be related:

The turnaround time for non-critical bugs is usually longer than 2 hours :upside_down_face:

3 Likes
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I had an older computer as well and was noticing horrible lag with a lot of different things.
The lifespan of a hard drive (so I hear anyways) is about 8 years.
I got a new drive (SSD) and it fixed the issue.

1 Like
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Well aware of all of the above, only started the other day however. Issues don’t occur outside of Roblox and the PC temperatures are all fine.

Edit: Forgot to mention that I also experienced the same issue on a different computer with completely different (and newer) hardware.

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Hoping this is the issue! Looking at what you’ve shown it does seem to look like it is (at least to me anyway) - thank you!’

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The usual suspect really however my SSD is pretty much brand new and doesn’t seem to have any impact on Roblox as of right now.

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Unfortunately I don’t believe this is the same bug – in the linked bug report, microprofiles showed a long FMOD::Output::mix time causing Sound to wait. Here, the FMOD::Output::mix times look fine, but instead it’s this CoordinatorJob::step.

I tried reproducing this issue by forcing PerformanceControlOrchestrator to act super aggressively, but so far haven’t got any frame spikes.

@uhKie_ran are you able to reproduce this still? I can add you to a channel that displays more information in the microprofiler – that would be super helpful

1 Like
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Ello, yes I can still reproduce this issue and I’d be able to send a more detailed microprofiler report if you add me to the channel :slight_smile:

Edit: It has seemed to die down though, definitely doesn’t happen as often as it did

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Sorry if I’m necro-ing this thread but, I’ve been experiencing the same issue for a few weeks now inconsistently.
While I don’t know the cause, I can say that my hardware is:
i9-11900K
7900XTX
Win 11
My system doesn’t thermal throttle, I have tested it with OCCT perfectly fine.

Whenever this occurs, my game freezes usually for about 5 seconds and I notice this spike under the CPU tab, on the rare occasion it will outright crash my Roblox client.
This is an inconsistent issue that I cannot recreate on command, it just happens somewhat frequently.

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1 Like
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Another bump because it’s still happening especially when the sound of people jumping is played, even worse if many players jumped at the same time.
Frame drops as low as 170 fps from constant 240 fps. Ran on a beefy pc and modern operating system.

It’s always the FMOD::Output::mix to me on microprofiler, but correct me if I’m wrong.

1 Like
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I am also experiencing this issue. I think it started happening like 2 days ago. It doesn’t look like FMOD::Output::mix is taking much frame time here. My MicroProfiler shows Coordinator::EventLogger::sendEvent taking up frame time.
microprofile-20251214-141942 - Copy.html.log (6.4 MB)
You can’t upload HTML files so I added .log to the end

I can’t determine any specific time when the lagspike happens. This happens in multiple games. Also, the MicroProfiler log I sent was during a rather resource-intensive game, though this same exact issue has happened in a much simpler game as well.
EDIT: It seems like these lagspikes increase in frequency over time, possible to the point of ~one per second. Though, the frequency sometimes decreases. I really don’t know why, but restarting my client seems to greatly decrease the frequency of the lagspikes, until they eventually start again.

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Also experiencing this issue. Happened to me some months ago before it fixes and then came back again, at first I thought it was dpc latency, fixing it does reduce some but the lag spike still occur, reinstalling windows/roblox doesn’t help either. Lag occur in multiple game also, including the modern baseplate template

Field System Information
OS Windows 11 Home 64-bit (Build 26200)
CPU 12th Gen Intel Core i5-12400F, ~2.5GHz (12 Cores)
GPU NVIDIA GeForce RTX 3050 (8 GB)
RAM 16 GB DDR4
Display 1920 x 1080 (75Hz)
System Scaling 100% (96 DPI)

microprofile-20251218-201949.html.log (2.6 MB)
microprofile-20251218-202044.html.log (2.6 MB)
microprofile-20251218-202114.html.log (2.6 MB)
microprofile-20251218-201905.html.log (2.8 MB)
microprofile-20251218-201926.html.log (2.6 MB)

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I managed to fix my issue using Process Lasso and setting CPU Affinity > Always > Disable Hyper-Threading for RobloxPlayerBeta.exe. Work perfect for me right now since I first find this suggestion Roblox FPS Stuttering on a High-End PC - #34 by newtonmetre a week ago. There is popup of Process Lasso every time you boot up windows after few days of uses but I don’t mind it much.