And if you have an AMD rig??
You can limit FPS with the AMD Radeon software, which works fine once the load is complete. I have mine set at max 40FPS. That function seems to be bypassed in the Start Up/Menu phase and I see FPS of 600+ whilst loading and the GPU at 99-100%.
This was the answer provided by Sebastian Wloch about this topic.
So, from my understanding, it was not an acknowledgment that this would be addressed.
“If that’s something that’s bothering you, I figure it’s because you are spending a lot of time in the menu” - if you would like to reduce GPU usage in the menus then you need to lower the graphic settings – the issue remains with the user. Keeping in mind the (continuously) increasing power consumption with modern GPUs, this is concerning.
I too would like to see more done to limit the GPU in menus, during installation and well anywhere pre-flight. Even though one might be flying most of the time when the application is open, many spend a lot of time installing, customizing the sim or are frequently in the menus - and if you wish to pause completely, without exiting; to keep your progress, it should not be necessary to exit the sim or lower the graphic settings to have the sim mostly pause on your GPU.
@Jummivana thank you for asking this question on the Dev Q&A earllier.
I feel that the workarounds I gave (just above) were more technical than what Seb discussed, which was disappointing.
I can’t think of a single game that I have to lower my graphics settings for a menu.
If the advice is to do just that, then there is something wrong with your menus. For starters I would suggest adding an option to turn off the useless 3D rendered backgrounds.
I choose my words carefully here, as they really do serve no purpose.
A couple of things I pointed out in the Q&A question thread:
I’m not sure why they haven’t extended #1 to the entire menu, with the hangar rendering only when visiting My Hangar. #2 is also something I reported to Zendesk soon after Sim Update 5 was released, don’t know what else I could do to bring this to their attention.
Additionally, I’m not sure why they cannot cap the FPS in the menus. There are several other games that already do this in order to prevent extremely high frame rates that can be harmful to the GPU and PSU (New World is a recent example, bricking many RTX 3090 cards).
And really that shouldn’t even be a thing. Didn’t someone find a way to fly out of the hangar? Why is a “world” even being generated for a menu. I’d really like a “Light” version of the menu, with all the bells, and whistles stripped away.
It is still possible to do so with the Developer Camera. Plenty of fully-textured airport objects rendered outside the hangar, which is full of complex objects on its own.
I also find that many resources are wasted on rendering the aircraft. Having an airliner selected heavily increases GPU usage compared to any GA aircraft, and yet it is pretty much the only thing you won’t be seeing while using the menu because the widget tiles are concentrated in the centre.
Which could be achieved very simply with that snapshot technique I mentioned above, something that Asobo have already implemented. I’m somewhat baffled they didn’t even consider extending this technique to the entire menu.
It just blows my mind that all those objects are being rendered, and yet we are asked to lower our settings while in menus. 
Focusing on the menu and hangar is very misleading in my opinion. MSFS uses maximum GPU power from the second the first screen loading screen appears.
All the time spent installing, updating and loading, rendering 100s of frames per second without anything resembling a 3D object on screen.
Seb appears embarassingly ignorant of what this problem actually is. The suggested ‘solutions’ insult our intelligence.
May be he not understand the issue we reported and it should again clarified. As example I limited already the fps to 35 , but these useless background rendering max out my 2080TI.
My system (whith monitor) consume in game-menu 750W and in-flight 810W - should be clear whats wrong here.
this seems similar to my former workaround : going in the the world-map
this would be a thing which user can and should do ( set a max fps ). But thats simple not the issue 
as mentioned, set a max fps . A very high fps count / gpu load while loading is common for most games and I assume not easy to avoid. Set at least a fps cap to your monitors max fps.
I’m not sure that’s true, for me at least. When I’ve been watching the update window like a hawk my GPU sits at around 3%. I’ll check tonight what I see on the main menu.
Agreed. This request has been sitting on the Wishlist snapshot for a long while now, and his answer shows that it hasn’t really been investigated. We already know that frame rate caps exist, and we shouldn’t have to modify them or turn down the graphics settings every time we go to the menu.
I believe that they implemented a 60 FPS cap for the installation manager in one of the early updates. Did they break it again recently?
Indeed, rendering the globe is a lot easier on the GPU than rendering the hangar. But right now sitting in the Content Manager will ensure the lowest GPU usage possible.
@Jummivana thanks for raising but I found Seb’s answer rude and passive agressive. Change the settings everytime you go in the menu, dont use the menus so much?
He gets so salty over any negative feedback.
Please just give us a config option, so simple!
Menus3DRendering=0 or
MenusFPSLimit=15 or
MenusResolutionScale=10
Oh and fix the basic bug where if your monitor is at 120FPS you need to set 30FPS to get a 60FPS cap 
Plan to bring this up again at the next dev Q&A, thank you for the feedback!
Could you please pass along the two things I pointed out in my previous post as well? #1 is a potential solution that could fulfil this request without a lot of extra effort from the team, and #2 might be a related bug (which I reported almost a year ago but it’s still occurring as of Sim Update 9). I appreciate that you are revisiting this request!
I would opt for completely disabling the 3D rendering. It’s pretty the first time you see it, but by the thousandth it’s lost it’s appeal.
thanks…
What I understood in yesterdays Q/A is, that ther is a step forward with a new planned feature.
The plan is that we get in a first step a experimental feature ( “low power mode” ) which we can enable with help of the dev-tool and which should reduce the system-load in menu ( hopefully only within the menu ).
It sounds like a more complex solution as just offer a setting where can disabling all effects in menus and so I’m excited to see how its work.
I’ve yet to watch the Q&A, so will probably do that this morning if I have time.
I hope you don’t have to have the dev. mode open all the time just to turn off the unnecessary 3D effects in the menu. I would rather have a speedy menu, than a flashy one.
To be honest, this kind of smacks of the resistance we met regarding disabling the “Press any key” part of the “attract sequence” as the sim launched. They ignored it for weeks, put it off at least once, but the Wishlist thread just had so many votes on it, being the most voted on at the time, that they just couldn’t ignore it any more.
I guarantee you someone at MS was annoyed by that decision. It was interesting to note that when the X-Box version was released the “Press any key” had made its return. I assume its still there. Someone has that as a design requirement I guess.
I hope too, because otherwise this new feature would be a flop ( at least for me )
I have similar thinking… also because we know about the former statement . And I realy hope these “experiment” will realy come some day into a final state.
But I’am try to think positive
In the Q&A, Seb talked about it as kind of a beta product in SU10 (he didn’t use the word “beta”, but that’s the sense I got from hearing it). He said if they get good feedback, people would get it generally available in SU11. (Hopefully without the toggle, but that wasn’t mentioned in the Q&A!)