Unstable Pc performance and lack of visual smoothness.

[Covy99]

I want to clarify something. This thread has accumulated too much noise, speculation, and irrelevant discussion, including references to other people’s experiences, which was a mistake on my part.
I plan to recreate the topic in a more technical form, focused strictly on my own setup, my own measurements, and clearly defined observations, without references to third-party nonsense or unverifiable claims.
The new thread will be structured around:
-A precise description of the observed behavior,
-What was measured and how,
-What is still unknown,
-And which parameters make sense to investigate further.

It has to return the discussion to a strictly technical and research-oriented direction.
My goal is not to 'prove' a theory or convince anyone.
My goal is to understand the cause well enough to eliminate or mitigate the problem in practice.
I am explicitly interested in approaches that can lead to a practical resolution, not in building expensive measurement setups purely for demonstration purposes.
Measurements are useful only as they help narrow the search space and guide corrective actions.
The intention is to return the discussion to a strictly technical, problem-solving, and research-oriented direction.

Here's the text that I made for the new topic in the txt file that I added to this post. If you have any suggestions or you think it might turn off some valuable people from this topic, I'm open to any editing.

I will respect that and just follow your investigation, i will not post anymore mine or third party stuff from other people.

[temperance]

The amount of image degradation is very big on devices, for example i remember my 1080p TV before 2020 event had better image clarity, sharpness etc than my expensive 4K Sony TV this is just an example for you how big effect this issue has on devices

The people arrived who are convinced that problem 1 is related to problem 2. I must say it took a while. Your problem has nothing to do with the original problem. It's a pixel mapping problem.

[NE666]

I want to clarify something. This thread has accumulated too much noise, speculation, and irrelevant discussion, including references to other people’s experiences, which was a mistake on my part.
I plan to recreate the topic in a more technical form, focused strictly on my own setup, my own measurements, and clearly defined observations, without references to third-party nonsense or unverifiable claims.
The new thread will be structured around:
-A precise description of the observed behavior,
-What was measured and how,
-What is still unknown,
-And which parameters make sense to investigate further.

It has to return the discussion to a strictly technical and research-oriented direction.

A good way forward, if you follow through with exactly that.

I am explicitly interested in approaches that can lead to a practical resolution, not in building expensive measurement setups purely for demonstration purposes.
Measurements are useful only as they help narrow the search space and guide corrective actions.

That's where I expect you to fail. You'll need to actually listen to, and take on board the informed technical advice that you're given. And this thread has not been a good testament to that being likely. You are already setting pre-conditions for what the investigation and the eventual solution must be, before you know anything concrete about it.


Regardless, for your sake, I hope you get to the bottom of it. If you find such an effect and can prove it, it would make an excellent write-up for this site.

[Inputdelay]

I want to clarify something. This thread has accumulated too much noise, speculation, and irrelevant discussion, including references to other people’s experiences, which was a mistake on my part.
I plan to recreate the topic in a more technical form, focused strictly on my own setup, my own measurements, and clearly defined observations, without references to third-party nonsense or unverifiable claims.
The new thread will be structured around:
-A precise description of the observed behavior,
-What was measured and how,
-What is still unknown,
-And which parameters make sense to investigate further.

It has to return the discussion to a strictly technical and research-oriented direction.

A good way forward, if you follow through with exactly that.

I am explicitly interested in approaches that can lead to a practical resolution, not in building expensive measurement setups purely for demonstration purposes.
Measurements are useful only as they help narrow the search space and guide corrective actions.

That's where I expect you to fail. You'll need to actually listen to, and take on board the informed technical advice that you're given. And this thread has not been a good testament to that being likely. You are already setting pre-conditions for what the investigation and the eventual solution must be, before you know anything concrete about it.


Regardless, for your sake, I hope you get to the bottom of it. If you find such an effect and can prove it, it would make an excellent write-up for this site.

I'm not setting pre-conditions on the solution. I'm setting real constraints on resources and access, which won't change regardless of advice.
I'm open to technical approaches within those constraints and willing to follow informed guidance if it leads to narrowing causes or actionable mitigation.
The intent is not to dictate the outcome, but to avoid repeating years of blind replacement and pointless measurements.
If the investigation shows that progress is impossible under these constraints, that itself is a valid conclusion.

[NE666]

If the investigation shows that progress is impossible under these constraints, that itself is a valid conclusion.

With respect, I do believe that's where you already are with this. You just haven't accepted it yet.

You've rejected ideas to create an automated test-rig able to provide a consistent, repeatable mouse input stimulus whilst measuring response. You've rejected making measurements for noise and disturbance on power and signal lines. You've rejected the possibility to operate within a real EMI shield cage setup. I really don't know what else you think might be left that could be usefully investigated, if you still think this is an environmental effect and nothing to do with software or hardware configuration.

[R3]

If the investigation shows that progress is impossible under these constraints, that itself is a valid conclusion.

With respect, I do believe that's where you already are with this. You just haven't accepted it yet.

You've rejected ideas to create an automated test-rig able to provide a consistent, repeatable mouse input stimulus whilst measuring response. You've rejected making measurements for noise and disturbance on power and signal lines. You've rejected the possibility to operate within a real EMI shield cage setup. I really don't know what else you think might be left that could be usefully investigated, if you still think this is an environmental effect and nothing to do with software or hardware configuration.

It is worth clarifying a few points.
1. I have exactly the same problem as O.P. (I'm only talking about him now, excluding other people with flash drives, TV, etc.)

2. We cooperate with him on solving this problem in terms of the methods, techniques, etc. used, for the same reason I say We

3. No one has abandoned the idea of creating an “automated test-rig able to provide a consistent, repeatable mouse input stimulus while measuring response” that is, an LDAT. The problem is that the OP will not be able to create it on his own without my assistance, and at the moment I personally lack sufficient experience to do so. Therefore, I created another thread on the same forum dedicated to its development. If you are willing to help in any way, I would be grateful, because this would ultimately help to create a similar device, including by the OP, which would move the research forward.

4."You've rejected making measurements for noise and disturbance on power and signal lines" - We are not against this, but let's be honest, at the moment we have not received a clear answer on how exactly this can be done, in the sense that an oscilloscope is an extremely vague concept,  without recommending specific characteristics of the oscilloscope or specific models, it is empty talk, because that the concept of an "oscilloscope" includes both the conditional DSO 138 200khz for $ 10 and the Siglent SDS7804A 8GHz worth tens of thousands of dollars, so we have not received a clear definition of "good" for our purposes. If you specify specific models or parameters, we can continue to talk about this kind of measurement in detail.

5.“You’ve rejected the possibility to operate within a real EMI shield cage setup.”
We have already explained why: creating a fully shielded room is prohibitively expensive, and shielding a single PC enclosure is impossible because USB device cables and video signal cables must enter it. Therefore, this type of shielding is meaningless. If you have the willingness to provide financial support for creating the kind of shielding you are referring to, we would be grateful. With respect

[Analog Kid]

Suggestion (free advice, take it for what it's worth):

If you can't afford fancy test equipment, how about if you try to borrow some? Someone in your area must have some high-quality gear; perhaps you can interest them in helping you chase down this elusive problem.

Pique their curiosity.

[negativ3]

https://youtu.be/moBCOEiqiPs

Worth considering...

[R3]

Suggestion (free advice, take it for what it's worth):

If you can't afford fancy test equipment, how about if you try to borrow some? Someone in your area must have some high-quality gear; perhaps you can interest them in helping you chase down this elusive problem.

Pique their curiosity.

We were unable to find people nearby with equipment of a similar class, let alone interest them. We put out a call on local amateur radio forums, but were openly trolled, and after that we did not return there.

[R3]

https://youtu.be/moBCOEiqiPs

Worth considering...

I've already seen this video, I have an sdr receiver, I didn't find any special anomalies, or I couldn't identify them.

[Manul]

https://youtu.be/moBCOEiqiPs

Worth considering...

Nice video, but it is funny when he says: "(...) loud, violent, chaotic (...) you are standing in a storm."

I wonder why we even need antennas and amplifiers? Hmm, let me think... Perhaps because it's a storm of microwatts and nanowatts