Sorry I’m a bit late to the party on this subject.
I’ve been playing with an rtx 3090 and i9 12900k, for quite some time.
I’ve never had it play or pan smooth enough for my liking.
I purchased a n RTX 4090, turned HAGS on (windows 11), dlss to quality, frame Generation on.
It has totally blown my mind.
I’ve never seen flight sim so smooth, even panning around the cockpit in London City airport.
I really am taken aback by the difference. It’s averaging 60fps with every slider to the full right, and every switch to ultra.
I’m proper back into it now. Unbelievable… Makes the rtx 4090 worth every penny. At first I wasn’t impressed, but then I realised that hags and frame Generation were not enabled.
I’ll shut up now, and get back to it 
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With a 4090 I would highly recommend using DLAA or TAA instead of DLSS, your graphics card is more than powerful enough and the graphical difference will blow your mind a second time!
(You are definitely CPU limited and not GPU limited unless your screen resolution is more than 4k!)
Hmm, is the difference really that big?
I know it depends on the game, but I did a simple blind test in Baldur’s Gate 3; 1440p with DLSS Quality, DLAA or TAA. TAA was by far the worst due to the blur, and I couldn’t even decide which was better of the two others. In the end I decided DLSS Quality was very marginally better. That doesn’t make sense, but since it was so close it was basically 50/50 which I’d pick.
And since DLSS Quality gave me 20-30 extra FPS the choice was very easy.
Of course in OPs case the choice is even easier, any setting that makes frame gen not work isn’t worth it.
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I’ve just gone to TAA (as suggested) it’s still as buttery smooth but sharper. It must be that frame generator thingy.
Honesty… I’m gobsmacked
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Done and you are correct.
Going to try dlaa
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I can notice a massive graphical difference between TAA and DLSS Quality. DLSS renders the game at a lower resolution and then upscales it to your monitor’s resolution. If you use DLSS you also get ghosting on glass cockpit displays.
If you don’t like the slight blurriness with TAA, DLAA is the best of both worlds, sharp graphics with minimal glass cockpit ghosting.
Personally, I would never use DLSS on MSFS, I tried it on Quality and I wasn’t happy with the graphical downgrade, I tried it on performance too and thought it looked absolutely horrible.
The OP has a RTX4090 while playing at 1440p, they definitely shouldn’t be using DLSS or any other features that lower graphical fidelity to improve performance. Hence my recommendation to use their choice of DLAA or TAA (whichever they prefer visually)
The difference is stellar
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Just got a 40series to replace my AMD card and got my first taste of FG. Wow! Extremely smooth!
Goodbye Radeon Its been a great ride.
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Well yeah, as mentioned it depends on the game, and I haven’t tested in MSFS specifically. I also noticed blurring on glass cockpits when I tried DLSS in MSFS, back when it was first released.
Looking at my BG3 comparison again, I can see differences but IMO it’s absolutely not a case of playable vs unplayable.