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I did try that last week - which worked the first time / worked for a day. Then the problem came back. Then I tried the newest driver. Didn't help. Then I tried an even older driver than the first older one - did not help either. But ey, I'll try again.

Again, to all, thanks for all help. It kinda seems impossible to fix, so I really appreciate you guys keep commenting. Much love to you all.

I hear you, I do. But what I don't understand is that all of this happened from one day to the other. I didn't do anything. And I just did a fresh install of Windows + drivers + the programs I've always used - which have worked perfectly before.
I did not see the need to try out your MPV configuration since everything worked perfectly this morning. Then after a reboot, poor performance was back. I noticed that when FH4 ran as it should, MPV played 4K HDR without problem. Then when the problem was back, after the reboot, and FH4 ran poorly again, then so did MPV; failed again to play 4K HDR. So it seems to me that whatever this problem is, it is what is causing the bad gaming performance in FH4 and the poor playback in MPV. That is why I have not tried your MPV configuration because it wasn't needed in the first place.

I can try and turn off all programs from start (of Windows) and see how it goes. I'll do that now, and report back :-)

Also, if it doesn't work disabling(from start of Windows) all programs, I'll give that driver update tool a try. But I'm sure I have all needed drivers installed. I've installed those I've always installed.

Thanks again

I've found two other posts on Reddit, where the users explains they suddently have poor performance in games - like from one day to the other - where reinstall of drivers and such has no effect. Just like with me.
Also there's a guy on Linus Tech Tips forum that also talks about sudden loss in performance.

It really has to be a Windows thing, right?

Tried rebooting again - still bad performance :-/

I will try and reboot my PC, without NZXT CAM of course, and see how my performance is - both in FH4 and SVP / MPV.

I'll report back

Thank you all again

Hello MAG79!

I appreciate all help so far but the problem is gone. I'm almost certain it's a Windows issue, or software issue. I've stopped using NZXT CAM for now since last night, because I didn't really need it, maybe it's CAM that was causing the problem, not sure though since I've tried closing it before but whatever, let me explain:

For a week or two now I've had a performance problem in Forza Horizon 4 (app based game, Windows 10 store). What was happening was one day it was running perfectly(like it has done since release of the game), then the day after the FPS was cut in half. Then the day after that 2nd day, it ran perfectly again and that what how it acted from one day to the other.
Other games, like fx Star Wars Battlefront 2, did run normally (does run a bit better after format of PC, even though FH4 still ran bad). But today, weirdly enough, FH4 runs perfectly (normally) and then I thought "Hmm, lets try and start a 4K HDR movie now since FH4 runs normally" and there it was; the movie runs at stuck 48FPS perfectly smooth and fine like before I formatted my PC.

So it must be a Windows thing or software thing, right? Only thing I've done differently since last night was turning NZXT CAM completely off but I've tried that last week when FH4 began running worse?
I did make a support ticket to the Forza team but haven't heard from them yet - almost a week now - but it's alright; most people are affected because of Covid-19.

And to all of your questions MAG79, no, I haven't touched my hardware and yes I am running in Dual channel mode and my PCI speed is x16 3.0 when using the Render test.

Again, thank you all for trying to help! <3

None of them worked either... Well, guess I'm done watching 4K HDR with higher FPS from now on. Damn it's annoying.

Oh well, thank you for all help so far, Chainik.

GPU load is between 60-65% and removing adaptive-sharpen (which worked perfectly before I formatted) does not help. Even tried delete everything in my appdata\mpv folder and that did not help either.

Thanks again for helping

I think I have made a report now.

I used "Send problem report...", under "Information" and attached my email to it, to get answers on my email.

I hope this is what you meant Chainik.

Thanks again

Oh yeah, I've noticed that it seems like my CPU usage is lower than before. My fans usually ramp up a bit because of usage and heat (fan curve) but it doesn't now.
So I'm wondering if SVP doesn't fully use my CPU like before? Hence why the performance is worse this time.

Again, thanks for helping Chainik!

Yes sorry - I should have mentioned that.

But yes, 2160p 10-bit