UPDATE 2 | Fixed input lag and floaty mouse with UPS

[spkii]

yes, exactly.
do u understand why?

I think it had more to do with the UPS having enough room to cool and work properlly, however, I've been researching into this a lot more since the posting of the thread, and I have to say that your theory might not be so wrong as I initially thought.

Tomorrow it arrives (Salicru SLC Twin Pro 2 1500VA Schuko SAI) will tell you results.

[nostva]

I’ve had this issue since 2020. Here’s a reproducible temporary fix that works for me every time.
Try these steps exactly:

- Turn off your PC and unplug everything (power cable, USB cables, etc.).
- Hold the power button for about 20 seconds.
- Reset the motherboard:

• Remove the CMOS battery.

• Short the CMOS jumper using any metal object.

• Put the battery back in its place.

- IMPORTANT:

• Plug in only the monitor and the power cable.

• Do not connect any USB devices.

• Make sure the PC is properly grounded.

- Turn on the PC.
- The motherboard must fully start without any USB devices connected (this is likely the main issue).
- Only connect USB devices after the motherboard has posted and Windows has started.

• You may connect a keyboard or mouse only if you need to exit the BIOS screen, but not before that.

If the issue comes back (and it probably will), repeat the previous steps. Good luck!

[MK92]

This is not a "fix" of any kind, it will only work until the MOBO capacitors gets filled again with bad electrcitiy, so like 1 hour or even less...no one will do this several times per day.

[d1alect]

keep installing useless things between your pc and the socet.

How's it useless? It already improved the issue for me by a large margin, I can instantly feel the difference when I turn on/off the online mode in the UPS. You're just projecting your frustration to others...

You can spend your whole life experiencing improvement from plugging something into an socet, but it won't fix the problem.
I'm telling you this only because I want to save you time and money.
I also experience improvement from connecting something metal between the PC and the socket, but believe me, a real fix costs a couple of bucks, and I wrote about this a long time ago.

and, if you think, your problem is socet, disconnect ups and play on battery, if you not feel instant fix, that is not socet.

[darkbebe]

do u understand now that not electricity?

No UPS = LAG, 2000VA UPS = NO LAG

Yeah I think it has something to do with electricity buddy.

only computer on ups ? or the internet modem/router too

[spkii]

Quick update on my input lag / “dirty electricity” issue, in case it helps someone in the same situation.

In my first thread I talked about how buying a new PSU seemed to fix my input lag and “floaty” mouse feeling. For a few days it felt amazing: Valorant was crisp, flicks felt natural, and even moving the mouse on the Windows desktop looked super sharp.

But after turning the PC on and off over the next week, the bad feeling slowly came back. Each day it felt a bit worse, almost like the PSU was struggling more and more. My (non-expert) theory is that the PSU capacitors were gradually getting “contaminated” by dirty power from the wall again.

After about a week I was honestly crushed. I went back to lurking forums and watching videos until I found a post where someone mentioned that a double-conversion UPS fixed their issue. Not just any UPS, but specifically double-conversion, because those units convert AC → DC → AC, effectively filtering out most of the dirty electricity before it reaches your PC.

By the end of summer I’d started a programmer job, and the first thing I wanted to do with my first paycheck was buy one of these UPS units. I waited a bit to read more about it, and in November I finally ordered a double-conversion UPS (Salicru SLC Twin PRO 2 700VA Schuko SAI).

I set up my power chain like this:

Wall outlet → UPS → PC + both monitors

On the UPS I enabled LINE mode so it always delivers filtered power to the outputs. Then I booted up the PC and launched Valorant.

Results:

• It didn’t feel 100% perfect, but it was much better.

• Mouse control improved a lot, and aiming for the head felt more consistent.

• The “60 Hz-ish” feeling was still there on the monitor, but overall I’d say the UPS removed about 60–70% of the issue.

I waited until the end of the month to see if the problem would slowly creep back like it did with just the new PSU. So far, it hasn’t.

Right now I’ve ordered a replacement PSU, because I suspect the remaining ~30% of the problem might be due to components that have already been degraded by years of dirty power. I’m also planning to buy a medical-grade isolation transformer to go even further with power conditioning.

I’ll keep updating this thread with any new results. Hopefully this helps someone else struggling with the same weird input lag / dirty power nightmare.


UPDATE 04-12-2025

The PSU replacement arrived, and I also ordered a new CPU (9800X3D) plus a new UPS with enough power (Salicru SLC Twin PRO 2 2000VA Schuko SAI).

At first, it felt horrible, just like when I didn’t have any UPS connected. Then I remembered that in the UPS manual it says the PC must be at least 20 cm away from the unit. With the old 700 VA UPS this wasn’t an issue because it was quite small, but the new one is gigantic, so I guess there’s more interference.

I moved the PC as far away as the power cable allowed and I have to say: the feeling is incredibly amazing now. Zero input lag, the mouse feels like an extension of my arm, I know exactly how much I need to move it to land headshots, and the monitor looks like real life at 1000 Hz.

I’ll keep updating weekly… if I don’t forget.

UPDATE 17-12-2025

Still doing good, however, I've watched some videos about dirty electricity and EMI in general, I think I'm going to buy some devices to help me document and find a better answer rather than just a plain 'UPS fixed it'. Will probably make another thread if I decide to keep researching and invest more into this.

Still working good for you?

[Roxtar]

only computer on ups ? or the internet modem/router too

Router is in another room, on the UPS I have PC and both monitors only.

[Roxtar]

Still working good for you?

Yep.

[Abdulr2hman]

"Welcome,
Is the Salicru SLC Twin PRO 2 700VA UPS sufficient for my needs? I plan to keep it connected to the power source at all times.
Also, if I replace my power supply, do I need to change any other components in my computer?

[nate03]

if you watch old gameplay where u had the problem and compare it to now, do u see any differences on video? if yes, could u post it