Yes, I think you should be getting better FPS than you are doing. I have a system going back 5 years (i5 7600k, 48gb ram, 2070s, water cooling, 750w Gold PSU, SSD) and I am getting 60 fps or more with the F18 with ‘high to ultra’ settings. I also get similar performance with 3rd party ac such as Hjet, Milviz 310, FSW Cessna 414, JF Pipers, Sting S4. I run a 35 inch Ultra screen at 1440p as my main monitor and also 2 27 inch side screens for addon programs.
I wouldn’t be discouraged though. You have the makings of a decent system. Just think a bit before you start spending a lot of money and upgrade your system. Some of the things I would look at have also been mentioned above including:
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PSU - do you need another one? Maybe you need a new one if your current one is a ‘generic’ one and less than 750w?
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Cooling - measure your CPU/GPU heat levels? If too hot there may be throttling reducing your PC performance. Consider better cooling if it is running hot.
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RAM memory - have you less than 16gb and what speed is it running at? 8gb ram running at a slow speed can impact PC performance quite a lot. 32gb ram correctly ‘synced’ running at a decent speed can sometimes help a lot.
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Sim/nvidia settings - there is quite a lot of good advice on some of the best performance settings. Maybe have a look here too.
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BIOS and Motherboard - you have changed your CPU but do you also need to look at updating your Motherboard and BIOS (make sure you know how to do this before changing it!)
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PC backround programs. Anything ‘heavy’ running in the background e.g. anti virus? I use ‘Defender’ but have FS20 as an exception when it’s running
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Community Folder - I run the sim with only 2 or 3 updated addons only
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Do you have a decent internet speed. Low speeds will impact scenery streaming performance.
A few things off the top of my head and apologies to you if you find some of these a bit too obvious and basic 