Doing exactly what is said in video below really helped smoothed my experience, especially around airports.
Other than that you also have to optimise in game GPU usage v CPU usage so you are not CPU limited. ie make your graphics card work more. At 1440 a 3080 may not be being working hard enough. There are a lot of threads on here about that. You can push the graphics card harder by turning some graphical setting to ultra, running at higher res, or higher render scale in FS graphics options etc.
Also make sure your windows desktop res is same as in game res as scalings can also slow things down a bit.
Also stutters can be a result of CPU being too busy, so turn LODs down a wee bit like 200 for TLOD and see if things improve.
Also there is a Window graphics setting called Hardware Accelerated GPU Scheduling which most people find they have a better time when switched off.
Other than that try doing what this video says. 
