Please share your MSFS test results.
Just to add a little color to this thread - I tried unsuccessfully to install both the KB5041587 and then the full 24H2 update on my AM4 based PC. I got the same result after trying both updates - immediate BSOD when trying to boot with an error 0x800f0845 Page fault in non-paged area. In both cases the update was backed out and my PC seems to be fine.
I was successfully able to install KB5041587 on my AM5 based PC and my tests with the sim have shown EXACTLY the same performance.
I think in this case itâs not a matter of opinion. This is about facts.
Donât know how the otherâs see it, but I for once would really like to know whether @hobanagerik or @tenpatrol is right about this administrator account issue. They definitely canât both be right âŠ
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Every other article, meaning the AMD site, except that one mentions using âanyâ administrator account, and not the non-existent or rather poorly worded âadmin modeâ, which is nothing more than clumsy wording on behalf of the author of that article. What they mean is any account with administrator rights. Running something elevated is running it in âadmin modeâ.
I might actually contact the author tomorrow about this tomorrow, about clarifying their meaning. Stating they are elevating the process or running it with administrator rights would have been more precise.
From the Powertoys site:
Windows applications run in User mode by default. To run an application in Administrative mode or as an elevated process means that app will run with additional access to the operating system.
It just means running a process as an elevated process i.e. run as Administrator from the right click menu, or other methods, and you arenât really running Windows in admin mode, just launching processes with admin rights. So a user with admin rights, elevating a process to run with admin rights is the same as the built in admin that doesnât require elevating processes as UAC is turned off for it by default, and they always run with admin rights.
Itâs not a mode as such, and to be fair the AMD site does have that phrase in quotes, but it does mean every single process launched by it with be elevated by default, which is potentially dangerous, and one reason why that account is disabled by default. You wonât be protected by a UAC prompt popping up that you arenât expecting to see.
The real question is why is it supposed to make a difference? One possibility could be that when you elevate a process, if that process spawns other processes, they may or may not be spawned with admin rights i.e. they donât inherit the admin rights. With the built in admin account, they would all launch with admin rights by default. Iâve seen that fail many times with programs that install drivers. You elevate the main program, it installs, then the drivers fail to install as they didnât get elevated by the main program.
But what would those child processes need admin rights to do? And if they have it, what are they able to do that means better performance?
I wonât be rushing in to 24H2 just yet, and certainly wonât install preview releases on to production machines.
âŠaaand just to throw another spanner in the works:
âŠapparently thereâs an update out now for 23H2, and something about core isolation mumble mumble
I believe there was a performance trade off for having that enabled, but itâs a security feature you donât really want to turn off if you can help it.
It, and memory integrity have an impact, I believe. I have all those features enabled, as well as UAC, as I would rather lose a few FPS, and be safe(r). If MS can restore some losses from the Win10 to 11 upgrade, either through 24H2 or a patch for 23H2, all the better.
So if we have it right, AMD on Windows 11 24H2, UAC turned off so all tasks launch with admin rights by default, and disable all core isolation features off will give you the best performance. 
I donât advocate anyone doing that. Sure, it might be faster but if some sneaky bit of malware gets on to your machine you have no protection against it, other than Defender or some other bit of AV, and they can miss the nasty 0 day stuff. Those features are there for a reason, and getting MS to make them work more efficiently is better than turning them off.
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Installed the 23H2 update, looks good to me. Ryzen 5. This was a 1 min capture with the Fenix rolling down 16R RJTT ~10% better
Ran in windowed mode to see the benefit to CPU perf , ~ 1589x1161 ( <50% of the 4K monitor)
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Do you happen to have the KB please? The latest CU I see in WSUS is 5041592.
Its here - August 27, 2024âKB5041587 (OS Builds 22621.4112 and 22631.4112) Preview - Microsoft Support
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Right, its a preview. I donât have those on our WSUS server, but I do have its immediate predecessor, 5041585
Nothing in its list of fixes screams performance improvements, so perhaps something undocumented. 10% is huge!
Just to remind - I tested MSFS on the âhidden administratorâ account and as expected I didnât notice any improvement.
The âhidden administratorâ account has higher privileges and fewer restrictions which probably impacts FPS and test results. Iâm also curious about what Microsoft changed to improve performance on other user accounts.
Seriously? Why not 30 sec mate? 
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Yes you may be right. I am not in admin mode.
For me, the stability and smoothness of the sim is the real benefit. My FPS measured more accurately is around 10-15% better. But the âsnappinessâ of the sim, and its smoother, crisper response is what i like. And thatâs defo not a placebo. I know this sim like the back of my hand, I have OCD so notice even a missing hair on my head.
Hoping this new version benefits everyone eventually.
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My friend, you are confidently incorrect here again. Please stop pushing this false information. There is no need to enable that admin account. I also work in IT and step 1 is disabled that account. Ask yourself, how did you even enabled the hidden admin account if not with admin rights to begin with?
Youâre not seeing a difference in performance because you are already using an admin account. Be it the disabled one or any other, they are identical.
Maybe Iâm just sour my expensive G2 has been forced offline prematurely. 
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There is one way, in recovery mode. But the first account Windows sets up for you is an admin anyway, if I remember correctly. If it wasnât, how would you ever administer the machine. I very rarely build machines from scratch by hand, using imaging processes instead, so those steps are done only once when I create a new image for deployment.
There was another way, in NT, where you deleted a file, and rebooted, and after about 10 minutes a login prompt appears. Something like that. A big security flaw.
But I agree on all other fronts.
During the installation of Windows 11 the first user account is granted administrator privileges by default so itâs not surprising that we can activate the âhidden Administrator accountâ - you should have known that mate.
Sorry, but it seems like you might not understand or know how the AMD engineers tested and on which specific Windows account they did it.
I tested on the same account - the account with no issues - so I didnât notice any improvement.
Looking forward to trying this - I have a 7950x3d and 4090, the sim often appears CPU bound in VR, whilst the 4090 doesnât break sweat.
As I mentioned earlier using a hidden administrator account is not recommended. Iâve been using this account for a long time because it is essential for me - I wonât explain why as thatâs not the focus of this topic.
Below, Iâll include a YT video that may help clarify things a bit
Friendly reminder, this issue was supposed to be fixed by the KB5041587 for version 23H2
or by installing the Windows 11 24H2 preview.
edit
In the case of this test after installing the KB patch or the preview version the hidden administrator account is not required and not recommended.
The goal is to test various games using the account you regularly use.
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checked now, yeah, its .037
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On intel there is also boost?