When the Roblox engine detects user input, a CPU usage spike can occur. Additionally, the more user inputs one does, the longer it takes to process.
This doesn’t seem to occur all the time(edit: pretty much everyone is having this issue; very frustrating), and when you are teleported to a different universe (or possibly leave), the issue disappears or “resets.”
I’ve only started experiencing this today at around 4 PM PDT.
I am also playing on Roblox using Fishstrap, which is a Roblox bootstrapper.
While you will likely not notice any performance issues at first, it can gradually worsen. This is made clear by the UIS:InputBeganChangedEnd label taking longer to process.
Specs
OS: Windows 11 Home
CPU: 11th Gen Intel(R) Core™ i7-11800H @ 2.30 GHz
Memory: 64 GB
GPU: NVIDIA GeForce RTX 3060 Laptop GPU
Attachments
Below is a video of me reproducing the bug and generating the MicroProfiler Dump attached in this post. Notice how my framerate drops from 144 fps down to as low as 7 fps when I spam the movement keys, mouse buttons and move my mouse (to rotate the camera) at the same time.
Can confirm that this also happens in PHIGHTING!. Seems like every time you respawn it takes longer to process, likely because your controls are being rebinded with UserInputService each time you spawn, though they do get unbinded before the rebind happens.
Yeah, can confirm it happens in every game and I am using the normal roblox web client. There has also been an issue lately, where every game will get a ~400 ms spike, including a baseplate, just randomly. Unfortunately, no one seems to be able to find the cause of that. There are only speculations that it’s from Hyperion. Lately Roblox has been getting the most unoptimized updates
Also happens when you move your mouse around in almost every game it causes your FPS to drop severely which probably has something to do with this issue
I’ve been experiencing this too, this is in one of the games I work on. I used a macro to spam user inputs extremely quick to highlight the problem.
I’ve heard players complaining about it, looked into the problem but it doesn’t look fixable(?) on my end, is it something to do with context action service? I don’t know
I can also confirm that it happens in many games, my CPU spikes and fps drops after a few minutes of being in a game. I know its not my device as someone else in my server was having the same issue despite having a way more advanced pc
Quick update, I reworked systems to not use ContextActionService and the problem still persisted; it seems to also lag whenever I simply move my mouse. Not expected behavior.
can confirm that this occurs in my computer too. weirdly, it works fine in the first 10-20 minutes or so, and then the frames start dropping. moving around my mouse or spamming movement keys drops frames from 144 to 10-30.
Interestingly, I’m able to reproduce this bug with the simple test case of… spamming ctrl on an empty baseplate? (correction: it actually seems to be if you press a key and move your mouse on the same frame, which I also happened to be doing here) It makes no sense, but you can see more and more SchedularHostConfig script labels getting attached as this happens
I suspect this is a latest update thing, as I wasn’t experiencing this last night (but a friend of mine was), and now I’m experiencing it this morning
Yeah, multiple players in my game are reporting this issue, their fps drops over time, after like 15 minutes their fps drops to like 30. I get large FPS drops when I move my mouse around after being in game for 10 minutes.
I can confirm that I have been experiencing this issue along with a friend. Not sure if it is just coincidence, but it appears to become more severe as time progresses. Was playing with a friend and the experience became laggier and laggier as every minute passed by, until we decided to cut out losses and just leave the experience.
Me and my friend both have good device specifications and we’ve played a plethora of experiences without experiencing something similar before.
Been hearing of a bunch of issues recently from our community about CPU spikes. After looking into it, looks like we have the exact same issue reported here. Really unfortunate timing.. hopefully a fix gets pushed out soon.
same issue happens in absolvement, low end devices seem to suffer the most when spamming wasd or opening the coregui menu and interacting with it. probably has to do with some type of performance/memory leak that continually holds previous inputs and tries to process them
microprofile for context below microprofile-20250814-175113.html (5.6 MB)
Happens in like every game I’ve played since last night.
After ~10 minutes (maybe less) repeated inputs seem to drop fps into the 20s and lower;
Even autoclicking will end up with a substantial frame drop.
Rapid inputs with the mouse from what I’ve noticed cause this issue the most frequent, I was playing a fighting-based game when I discovered this issue, my fps dropping to around 10 or less whenever I clicked a lot. From my perspective, this seems to be some-sort of memory leak, hopefully it gets fixed soon as it makes some games rather unplayable.
I’ve also been experiencing this. It starts off fine but over time, each input, even unbound ones causes the frame to stutter, and it gets worse over time until the game is unplayable. Spent like 3 days trying to find the cause
