What is the GPU actually doing when the user is setting on the welcome screen deciding what to fly and where to go. Seems to me the GPU should not have that much to do at that moment ? Nothing is happening on the screen, the program is simply waiting for you to decide what and where you wish to fly and the GPU is sitting there straining at a 75% load !
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The short answer?
Trying to eat itself!
I am sure Asobo are aware of the problem and will fix this.
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Check what it does minimized! 100% usage, all computer fans simulate Concorde takeoff noise!
It’s great…
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Filling the ram would be a guess
The framerate will drop a little too on menus, especially the startup menu. I think during startup on main its storing RAM onto the Vram for a faster and smooth transition to the cockpit
Mining BitCoins 
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It’s trying to get maximum FPS on the load screens and in the menu.
Setting Vsync to 60FPS, or using an external tool (like RivaTuner that comes with MSI Afterburner) to limit the FPS solves this until Asobo fixes this in the base sim.
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I’m more curious what is it doing during the initial game load or during the game download/update.
Mining flight sim credits for us?
It’s pre-rendering huge trees. You think they can all be done in real-time?
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This is the solution to this problem right now. Cap the frame-rate. Just to add that you can do the same in the Nvidia Control Panel if you’re using an Nvidia card. Select the flight sim in 3D settings and cap it there, I have mine capped at 70fps and it massively reduces the load and heat/noise from the card when sitting in the menu.
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You kind of answered your own question there 
Like most games it is able to render a lot of frames on the menu hence higher load… this is why a lot of games these days are able to limit the frame rate on the menus.
Nice! Then I can buy new clothes for my slightly strained avatar pilot. 
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Why should it transfer any cockpit data while sitting on the menu. The program does not know what plane I might select. Not much sense transferring data for a cockpit that I may not fly in. Seems something else is going on and it is not using CPU or ram activity… just GPU.
probably mining bitcoin
And if you run out of ram then download more here: …
Actually i tend more to the bitcoin mining answer.
To give one possibly helpful answer: as the whole UI is acting in the 3D space, the GPU really does its very best to maximize fps (as it is not throttled by the CPU, much much higher than anyone needs) . If you don’t want the fan noise and high energy use, then you can set a maximum FPS in the Nvidia 3D settings (I have it on 60), and your GPU should calm down. [Edit: sorry, MJBlackthorn gave a helpful answer, too]
But aside from this, it’s a shame that ASOBO did not care for this.
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This. If you don’t set a limiter or vsync, the sim (and all other apps/games I know) will do what you asked for : the full power of your computer just displaying at unreal high fps a simple menu, and overheating for nothing.
Edit : just for fun display your fps during the blue loading bar 
Should I set a frame cap inside msfs2020 settings too?
Or just in the Nvidia Control Panel?
AFAIK the fps cap in game only work if you have vsync ON which is kind of weird IMHO. If your in game setting have vsync off, you can use the nvidia control panel like me (I have vsync off in game and set the limiter to 60fps in NCP, no tearing so far, smooth).