Try setting your Windows power plan to ultimate (or performance). It will load your sim initially onto the 3dvcache cores but will use all available cores as needed. No cores will be parked.
When I load into a flight I can see my internet connection pegged at around 500mbps which is the speed from my ISP. During a flight, it will regularly burst to 500mbps. I get some micro stuttering but who knows if its due to the internet stream, gpu/cpu balancing, or lackluster sim code 
.
Nice to still have MSFS2020 to keep my sanity. 
I have 7800X3D and rtx4070
The processor is running at a maximum of 15-20%.
Video card - 100%
I think that the video card is more important, but the 5800 could handle MSFS24…
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I’m still getting decent results with my 5800X3D; multithreading will max out 8 cores with SMT off flying at 2000’ over Los Angeles (busy PG area) at 4K Ultra + TLOD 400, while nearly maxing out my Radeon 7900 XTX.
With SMT on, it’ll max out all 16 logical cores while processing new scenery data as it downloads, but is hitting more like 70-75% in between those spikes.
This gives me in the 35-45 fps range except when going directly over large areas of trees where it dips. 
Flying higher improves frame rates as scenery gets less detailed.
So a full 16 physical cores might well do a bit better, especially if paired with the fastest NVidia cards (assuming no VRAM shortage slowdowns!)
I just posted a thread in which I tested the sim assigned to my 7950X3D Vcores only, Non-Vcores only, and all 16 cores. I did not see a significent difference. I’m probably GPU limited.
I’m going to stick with Vcores only.
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I have the exact same specs, 7950x3D, 4090, 64GB Ram @ 6000 and my sim also stutters and has audio stutters. It happens when panning, loading in and also when I’m in the menus and zooming in and out on airports on the globe selecting a gate. Does your audio stutter?
I also see that my cores are parked when focussing in the sim window. In MSFS2020 it’s fine.
Also frame gen is broken and often does that weird glitch where it drops massively in frames.
Hi there Brad,
I can’t say I have audio jitters, that seems to be working fine for me.
I can say that I am mainthread limited always. Gfx card is fluctuating between 90% and 55% utilization.
I agree about frame gen. Turning it off and on doesn’t appear to do anything for me. There’s no fps boost.
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Seems like an AMD issue atm reading all the posts, all the system reports have these issues in common
If I had the option (which I do rn) of keeping my 9800x3d order I managed to place this morning, vs the 9900x for $80 less, which would you go for? MSFS24 and Forza tend to be my main games, and otherwise the rig tends to be used for machine learning projects and whatnot. Also trying to teach myself more complex linux stuff/docker where cores may be of use? Is the multi-CCD thing still an issue?