Question Random PC "Input lag" ?

[User1990]

I don't know if input lag is the right thing to call it but here is what I've been experiencing for a long time now.
So I've playing a lot of games but mainly FPS (been playing FPS my whole life at a high level).
So what is happening is that game will feel incredibly good and crispy and I'll be hitting the shots I'm supposed to hit and suddenly after a week (sometimes even a day or two its completely random) pc will start feeling weird and mouse will start feeling uncontrollable and will honestly miss the easiest shots.
I understand enemies might be bad/good sometimes or I might be having a bad/good game.
Whenever this happens if it persists I'll just jump on a low rank alt to test if it just happens to play against insane players every game even though I know that's not the case and I'll literally get <Mod Edit> on by low rank players which normally I'd get 50 against.
Playing Deathmatch feels like I have a few seconds of stable input latency and I hit every shot and then it lags for a few minutes, then back to normal again and so on. Could it be system stability ?

Un till recently I though I fixed the problem but it just came back again.
So what helped last time was disabling expo,smt and spread spectrum but that only helped for like 2-3 days and changing any of these literally makes no difference now.

Fixed my internet issues which I though was the problem all this time. (new modem/router/access point)
I've formatted PC a million times.
I've tried payed optimizations for windows 10/games.
I've bought a completely new PC.
Different mice.
Different mousepads.
Different ethernet cables.
Different DP cables.
Removed HDD/SSD and only kept M2.
Removed GPU riser.
Removed all RGBS.
Removed front USBS/USB C/SPEAKERS.
My temps are also fine, even downvolted GPU.
Everything you can think about.

Really dont wanna jump to electricity issues just yet, because I don't even know what I can do about it.

MOBO : B650 AORUS ELITE AX
CPU : RYZEN 7600X
RAM : KINGSTON FURY 6000MHZ 32GB(16x2)
GPU : RTX 2080
PSU : Corsair TX750M


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[Ralston18]

There are three tools you can use to help diagnose the problem: Task Manager, Resource Monitor, and Process Explorer (Microsoft, free).

https://learn.microsoft.com/en-us/sysinternals/downloads/process-explorer

Use all three tools but only one tool at a time. Get a sense of what each tool does and the information that the tool is providing.

The key objective is to observe with one of the tools. Ideally observing when play is "good and crispy".

Then when play becomes "weird" etc. observe again and determine what, if anything, changed.

A second monitor will make it easier to watch performance while playing versus toggling windows.

And the tools may slow performance a bit so that itself must be considered.

Pay attention to what resources are being used, to what extent, and what is using any given resource.

May take some time and effort. Just be methodical and do not start changing anything else until you have, hopefully, discovered something specific that always ties to the performance drop.

Something that you can then demonstrate or repeat at will.