Hey, maybe try the settings on this page…Best Graphics Settings Guide - Flight Simulator Blog
Has certainly helped me especially with bench marking for further tweaking & I only have an i7 & nvidia 1070ti… It’s certainly playable, in fact MSFS runs better than X-plane 11 ever did on my setup even with all the tweaks I used for it too.
Clouds are a big frame hit so usually run on high & sometimes medium. Trees, Buildings & Grass also sometimes on high depending on location, large cities eat fps. I also set my render scaling down to 80% to help the system out.