Here you go. Read through Grabber’s posts in this thread. Something is wrong with your configuration right now and you are showing all the signs of your CPU being the bottleneck. This can be an issue for everyone. Even the fastest CPUs cannot do everything in this game without an occasional CPU bottleneck stutter, and you do not have the fastest CPU.
Your graphics card is more than enough to get decent GPU performance but your CPU isn’t helped by a good graphics card. Some MSFS graphics settings tax the CPU instead of your GPU.
Hope this helps.