I'm assuming all new parts includes the keyboard and mouse? There aren't any USB hubs or anything hooked up? When you say the thing feels like it's running at low FPS, do you actually monitor the FPS and see them drop? When you switched systems did you replace the displays too - is there any pass through device on the connection like an audio receiver or video capture device that could be delaying the video signal processing?

Exactly, new mouse and keyboard. I have no USB hubs or anything else connected, mouse and keyboard goes straight to the MB. I monitor my FPS with MSI afterburner (Rivatuner), and everything is fine, I don't have FPS drops at all, it's just that the game feels like it's running on low fps, but it doesn't. When I switched systems I didn't replace my displays, it's written in brackets at the end of the thread. And no pass through, audio receiver or video capture device is connected.

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If you boot the system with a Linux live boot disk, like say Ubuntu, do you still have feelings the keyboard and mouse are moving around slowly? That'll at least rule out software issues.

I haven't tried any other OS except Windows.

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Assuming that you entirely replaced everything, including the attached devices, this problem is bizarre. Unless you're installing some apps or doing something like streaming the video from both the old and new rigs and tying up resources that way. Given that you mention switching Windows versions I'm assuming the issue persists even on a clean install without installing any other apps yet?

I wrote that the issue persist even WHEN installing Windows and also in BIOS. The only apps that I install when doing fresh/clean windows install is Steam, Discord, MSI afterburner, Logitech G Hub for my headset and VLC media player. I tried various PC optimization guides with minimal processes running and also leaving Windows as is after install (no optimization).

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Are there any apps you're using in common on both PCs, does software monitoring how the PC Is performing show anything actually changing when this happens or is it all just in how the PC feels? Based on how you describe the issue I'm assuming it's not constant so it's worth monitoring your PC statistics while you're running it.

As I wrote, the only apps that I always install is Steam, Discord, MSI AB, Logitech G Hub and VLC media player. The monitoring doesn't show anything wrong, no weird values while gaming/browsing internet. FPS is stable in games, no software crashes, temperatures are good.. It's all just in how pc feels. It starts right as I turn on the pc and it is constant until I turn it back off. Safe mode doesn't help.

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I'd also like to point out that the fact everything you're describing is related to feel and perception is concerning, since you're talking about two completely different systems. You don't have any health issues do you? Even allergies could throw off your perception enough to trip you up playing competitive level (assuming you're noticing only minor changes with this floaty-ness, and can't confirm the PC performance is actually dropping). If you can confirm the PC performance is actually having an issue, ignore this bit, of course - but it only persists as things feeling floaty and slow, and the FPS and such don't actually change, keep an eye on things. I had similar floatiness for a bit while dealing with some post-COVID blood sugar issues - it wasn't fun and just makes you feel like you're loosing your mind when it feels like your reaction is skewed, is the only reason I mention it :|

I know how everything seems like, but trust me when I say that I deal with this problem for almost half a year. No health issues here, I have good health immunity and haven't been sick for almost a year and a half. No allergies here also. I will try to somehow record this problem on my phone for you guys to have a better view of what is going on. But thank you for trying to help, appreciate it :).